PDS4 Rings dictionary attribute definitions.

This is version 1.0 of the definitions file. It is current through 
the PDS4_RINGS_1E00_1A00 version (IM version 1.14, rings version 10).

Note: Currently the attributes are organized based roughly on functionality, 
      not alphabetically.


*  ....................................................................  *

name                   body_spice_name

value data type        ASCII_Short_String_Collapsed

description            The body_spice_name attribute is a NAIF-recognized string
                       identifier for a physical object (spacecraft, planet, instrument
                       transmitter, system barycenter, etc.), associated with the data.

*  ....................................................................  *

name                   frame_spice_name

value data type        ASCII_Short_String_Collapsed

description            The frame_spice_name attribute is a NAIF-recognized string
                       identifier for a reference frame associated with the data.

*  ....................................................................  *

name                   horizontal_display_axis

value data type        ASCII_Short_String_Collapsed

description            The horizontal_display_axis attribute identifies, by name, the axis
                       of an Array (or Array subclass) that is intended to be displayed in
                       the horizontal or "sample" dimension on a display device. The value
                       of this attribute must match the value of one, and only one,
                       axis_name attribute in an Axis_Array class of the associated Array.

*  ....................................................................  *

name                   horizontal_display_direction

value data type        ASCII_Short_String_Collapsed

description            The horizontal_display_direction attribute specifies the direction
                       across the screen of a display device that data along the
                       horizontal axis of an Array is supposed to be displayed.

*  ....................................................................  *

name                   vertical_display_axis

value data type        ASCII_Short_String_Collapsed

description            The vertical_display_axis attribute identifies, by name, the axis
                       of an Array (or Array subclass) that is intended to be displayed in
                       the vertical or "line" dimension on a display device. The value of
                       this attribute must match the value of one, and only one, axis_name
                       attribute in an Axis_Array class of the associated Array.

*  ....................................................................  *

name                   vertical_display_direction

value data type        ASCII_Short_String_Collapsed

description            The vertical_display_direction attribute specifies the direction
                       along the screen of a display device that data along the vertical
                       axis of an Array is supposed to be displayed.

*  ....................................................................  *

name                   orbit_number

value data type        ASCII_Short_String_Collapsed

description            orbit_number if present is the value assigned by the mission for
                       the orbit number associated with the observation. Optional in
                       labels of occultation observations and may be used multiple times.

*  ....................................................................  *

name                   reflectivity

value data type        ASCII_Real

description            reflectivity indicates I/F, a dimensionless standardized measure of
                       reflectivity that is unity for a Lambertian surface viewed at
                       normal incidence.

*  ....................................................................  *

name                   minimum_reflectivity

value data type        ASCII_Real

description            minimum_reflectivity indicates the largest value of I/F within the
                       data object.

*  ....................................................................  *

name                   maximum_reflectivity

value data type        ASCII_Real

description            maximum_reflectivity indicates the largest value of I/F within the
                       data object.

*  ....................................................................  *

name                   axis_name

value data type        ASCII_Short_String_Collapsed

description             The axis_name attribute contains a string that matches the
                       axis_name attribute in an axis_array class of an associated array
                       object.

*  ....................................................................  *

name                   sampling_interval_length

value data type        ASCII_Real

description             The sampling_interval_length attribute provides the spacing of
                       points, in units of length, at which data are sampled and at which
                       a value for an instrument or data parameter is available. This
                       sampling interval can be either the original (raw) sampling or the
                       result of some resampling process.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   sampling_base

value data type        ASCII_Real

description            The sampling_base attribute indicates the numeric base of the
                       associated logarithmic or exponential sampling interval.

*  ....................................................................  *

name                   sampling_scale

value data type        ASCII_Short_String_Collapsed

description            The sampling_scale attribute indicates the type of scale that
                       applies to the sample interval increments. It must have a value of
                       either Linear or Logarithmic.

*  ....................................................................  *

name                   first_ring_radius

value data type        ASCII_Real

description            The first_ring_radius attribute provides the value of the first
                       increment along the radius axis of an array given in units of
                       length.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   last_ring_radius

value data type        ASCII_Real

description            The last_ring_radius attribute provides the value of the last
                       increment along the radius axis of an array given in units of
                       length.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   sclk_start_time

value data type        ASCII_Short_String_Collapsed

description            sclk_start_time is the value of the spacecraft clock corresponding
                       to the start_date_time given in the label.

*  ....................................................................  *

name                   sclk_stop_time

value data type        ASCII_Short_String_Collapsed

description            sclk_stop_time is the value of the spacecraft clock corresponding
                       to the stop_date_time given in the label.

*  ....................................................................  *

name                   reference_time_utc

value data type        ASCII_Date_Time_YMD_UTC

description            reference_time_utc provides a date and time in UTC format. Given in
                       a label when time values in a table are given as elapsed seconds
                       offset from a reference time. Unless there are compelling reasons
                       to do otherwise, reference_time_utc should correspond to the start
                       of a day. Required anytime a table field is given relative to a
                       specific date and time other than when Barycentric Dynamical Time
                       is used (e.g., observed_event_tdb).

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   observed_event_time
version                1.0

value data type        ASCII_Real

description            observed_event_time indicates the instant at which photons were
                       received at the instrument. As a field in an occultation profile
                       table, it is given in numeric seconds as an offset from the
                       specified UTC reference time. The reference time is preferably the
                       start of a day. In a label the corresponding time interval end
                       point values are given by the required start_date_time_utc and
                       stop_date_time_utc attributes in the Time_Coordinates class. At
                       least one of either observed_event_time or observed_event_tdb, must
                       be a table field for occultation data. Both may be used.
                       observed_event_time is equivalent to spacecraft_event_time for
                       spacecraft data and to earth_received_time for Earth-based data. It
                       is always the photon arrival time, so in this regard we treat
                       typical spacecraft radio occultation data as Earth-based, referring
                       to the time at the DSN receiving station. For an uplink radio
                       occultation, this is the spacecraft event time. Note: For
                       occultation data, PDS prefers year-month-day format for dates
                       rather than year plus day-of-year format. However, either format is
                       permitted.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   maximum_observed_event_time

value data type        ASCII_Real

description            maximum_observed_event_time gives the largest value for
                       observed_event_time in the associated data file. It is given in
                       numeric seconds as an offset from the specified UTC reference time.
                       maximum_observed_event_time is optional in labels since the data
                       file time interval end point values are given by the required
                       start_date_time_utc and stop_date_time_utc attributes in the
                       Time_Coordinates class.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   minimum_observed_event_time

value data type        ASCII_Real

description            minimum_observed_event_time gives the smallest value for
                       observed_event_time in the associated data file. It is given in
                       numeric seconds as an offset from the specified UTC reference time.
                       minimum_observed_event_time is optional in labels since the data
                       file time interval end point values are given by the required
                       start_date_time_utc and stop_date_time_utc attributes in the
                       Time_Coordinates class.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   observed_event_tdb
version                1.0

value data type        ASCII_Real

description            observed_event_tdb indicates the instant at which photons were
                       received at the instrument. It is represented in the 'Barycentric
                       Dynamical Time' system, as a number of elapsed seconds since the
                       J2000 epoch. This is consistent with the definition of 'ephemeris
                       time' as used in the SPICE toolkit. In a label the corresponding
                       values are given by the optional start_observed_event_tdb and
                       stop_observed_event_tdb attributes. At least one of either
                       observed_event_time or observed_event_tdb, must be a table field
                       for occultation data. Both may be used. observed_event_time is
                       equivalent to spacecraft_event_time for spacecraft data and to
                       earth_received_time for Earth-based data. It is always the photon
                       arrival time, so in this regard we treat typical spacecraft radio
                       occultation data as Earth-based, referring to the time at the DSN
                       receiving station. For an uplink radio occultation, this is the
                       spacecraft event time.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   observed_event_start_tdb

value data type        ASCII_Real

description            observed_event_start_tdb indicates the value for earliest time in
                       the described data, and is given in elapsed seconds since the J2000
                       epoch. Optional in labels; not intended for use as a table field.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   observed_event_stop_tdb

value data type        ASCII_Real

description            observed_event_stop_tdb indicates the value for latest time in the
                       described data, and is given in elapsed seconds since the J2000
                       epoch. Optional in labels; not intended for use as a table field.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   observed_event_time_utc
version                1.0

value data type        ASCII_Real

description            This attribute is intended to be used as a column in a table.
                       observed_event_time_utc indicates the UTC time corresponding to the
                       instant at which photons were received at the instrument. In a
                       label the corresponding values may be given by the optional
                       start_observed_event_utc and stop_observed_event_utc attributes (or
                       the corresponding values using Barycentric Dynamical Time, _tdb).
                       At least one of either observed_event_time_utc or
                       observed_event_tdb, must be a table field for occultation data.
                       Both may be used. observed_event_time is equivalent to
                       spacecraft_event_time for spacecraft data and to
                       earth_received_time for Earth-based data. It is always the photon
                       arrival time, so in this regard we treat typical spacecraft radio
                       occultation data as Earth-based, referring to the time at the DSN
                       receiving station. For an uplink radio occultation, this is the
                       spacecraft event time.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   observed_event_start_time_utc

value data type        ASCII_Date_Time_YMD_UTC

description            observed_event_start_time_utc indicates the UTC value for earliest
                       time in the described data. It is part of a start/stop pair. If one
                       of observed_event_start_time_utc and observed_event_stop_time_utc
                       is used, both must be used.

*  ....................................................................  *

name                   observed_event_stop_time_utc

value data type        ASCII_Date_Time_YMD_UTC

description            observed_event_stop_time_utc indicates the UTC value for latest
                       time in the described data. It is part of a start/stop pair. If one
                       of observed_event_start_time_utc and observed_event_stop_time_utc
                       is used, both must be used.

*  ....................................................................  *

name                   spacecraft_event_time
version                1.0

value data type        ASCII_Real

description            spacecraft_event_time indicates the instant at which an event
                       occurred at the spacecraft, e.g., the arrival or departure of a
                       photon. Required table field for radio occultation data, but not
                       used in stellar occultation data. The time is given in numeric
                       seconds as an offset from the specified UTC reference time. The
                       reference time is preferably the start of a day, and is required to
                       be given in the label using the attribute reference_time_utc.
                       Additionally, in radio occultation labels the corresponding time
                       interval end point values are given by the required
                       start_spacecraft_event_time_utc and stop_spacecraft_event_time_utc
                       attributes.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   spacecraft_event_start_time_utc

value data type        ASCII_Date_Time_YMD_UTC

description            spacecraft_event_start_time_utc gives the UTC time corresponding to
                       the earliest time given by spacecraft_event_time in the data table.
                       However, while spacecraft_event_time is given as seconds offset
                       from a reference time, spacecraft_event_start_time_utc is given as
                       a UTC date time. Required in the label for radio occultation data.
                       Not used for stellar occultations.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   spacecraft_event_stop_time_utc

value data type        ASCII_Date_Time_YMD_UTC

description            spacecraft_event_stop_time_utc gives the UTC time corresponding to
                       the latest time given by spacecraft_event_time in the data table.
                       However, while spacecraft_event_time is given as seconds offset
                       from a reference time, spacecraft_event_stop_time_utc is given as a
                       UTC date time. Required in the label for radio occultation data.
                       Not used for stellar occultations.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   earth_received_time
version                1.0

value data type        ASCII_Real

description            earth_received_time provides the time at which telemetry or other
                       photons were received on Earth. Intended to be used as a table
                       field which is optional for stellar occultations, and is not used
                       for radio occultation data (one of either observed_event_time or
                       observed_event_tdb is used instead). earth_received_time is given
                       in numeric seconds as an offset from the specified UTC reference
                       time. The reference time is preferably the start of a day, and is
                       required to be given in the label using the attribute
                       reference_time_utc. This is equivalent to OBSERVED_EVENT_TIME for
                       radio occultations. It is an optional table field for stellar
                       occultations and is not used for radio occultations. When
                       earth_received_time is used, the attribute reference_time_utc is
                       required in the label.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   earth_received_start_time_utc

value data type        ASCII_Date_Time_YMD_UTC

description            earth_received_start_time_utc gives the UTC time corresponding to
                       the earliest time for the data product at which telemetry or other
                       photons were received on Earth. Optional for occultation data.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   earth_received_stop_time_utc

value data type        ASCII_Date_Time_YMD_UTC

description            earth_received_stop_time_utc gives the UTC time corresponding to
                       the latest time for the data product at which telemetry or other
                       photons were received on Earth. Optional for occultation data.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   ring_event_time
version                1.0

value data type        ASCII_Real

description            ring_event_time indicates the instant at which photons associated
                       with a particular ring observation intercepted the ring plane. This
                       time is earlier than the associated observed_event_time by an
                       amount equal to the light travel time. ring_event_time is a
                       required table field for ring occultation data. The time is given
                       in numeric seconds as an offset from the specified UTC reference
                       time. The reference time is preferably the start of a day, and is
                       required to be given in the label using the attribute
                       reference_time_utc. One of ring_event_time or ring_event_tdb is a
                       required table field for all ring occultations. One of
                       ring_event_time or ring_event_tdb is a required table field for all
                       ring occultations. Both may be used. If ring_event_time is used,
                       the attribute reference_time_utc is required in the label.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   ring_event_start_time_utc

value data type        ASCII_Date_Time_YMD_UTC

description            ring_event_start_time_utc gives the UTC time corresponding to the
                       earliest time given by ring_event_time or ring_event_tdb in the
                       data table. ring_event_start_time_utc is required for all ring
                       occultation data. ring_event_start_time_utc is required label
                       attribute for all ring occultation data.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   ring_event_stop_time_utc

value data type        ASCII_Date_Time_YMD_UTC

description            ring_event_stop_time_utc gives the UTC time corresponding to the
                       latest time given by ring_event_time or ring_event_tdb in the data
                       table. ring_event_stop_time_utc is required for all ring
                       occultation data. ring_event_stop_time_utc is required label
                       attribute for all ring occultation data.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   ring_event_tdb
version                1.0

value data type        ASCII_Real

description            ring_event_tdb indicates the instant at which photons associated
                       with a particular ring observation left the ring plane. This time
                       is earlier than the associated observed_event_tbd by an amount
                       equal to the light travel time. ring_event_tdb is represented in
                       the 'Barycentric Dynamical Time' system, as a number of elapsed
                       seconds since the J2000 epoch. This is consistent with the
                       definition of 'ephemeris time' as used in the SPICE toolkit. One of
                       ring_event_time or ring_event_tdb is a required table field for all
                       ring occultations. Both may be used.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   ring_event_start_tdb

value data type        ASCII_Real

description            ring_event_start_tdb indicates the value for earliest time in the
                       described data, and is given in ring_event_tdb format. Optional in
                       labels; not intended for use as a table field.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   ring_event_stop_tdb

value data type        ASCII_Real

description            ring_event_stop_tdb indicates the value for latest time in the
                       described data, and is given in ring_event_tdb format. Optional in
                       labels; not intended for use as a table field.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   along_track_timing_offset

value data type        ASCII_Real

description            along_track_timing_offset is a timing offset to the along track
                       spacecraft position. It is the value that minimizes differences in
                       radii of matching circular ring features observed on the ingress
                       and egress sides of the occultation track. Optional in labels for
                       radio occultation.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   data_quality_index

value data type        ASCII_Short_String_Collapsed

description            data_quality_index provides amore precise subjective assessment by
                       the data provider of the quality of the observed/predicted ring
                       occultation. Possible values are:.

*  ....................................................................  *

name                   data_quality_score

value data type        ASCII_Short_String_Collapsed

description            data_quality_score indicates the overall quality of the data, based
                       on a subjective evaluation by the data provider. Required in labels
                       of ring occultation radial profiles. Normally not intended as a
                       value for a table field.

*  ....................................................................  *

name                   ring_detected

value data type        ASCII_Short_String_Collapsed

description            The ring_detected attribute is a yes-or-no flag that indicates
                       whether a specific ring has been detected. Typically used in radial
                       profiles of a single ring.

minimum characters     1
maximum characters     1

*  ....................................................................  *

name                   occultation_type

value data type        ASCII_Short_String_Collapsed

description            occultation_type distinguishes between three types of occultation
                       experiments: Stellar, Solar, or Radio. Stellar occultations involve
                       observing a star as a targeted ring or body passes in front, as
                       seen from either a spacecraft or Earth-based observatory. Solar
                       occultations are similar to stellar occultations except that the
                       Sun is used in place of a star. Radio occultations typically
                       involve observing the continuous-wave radio transmissions from a
                       spacecraft as it passes behind the target as seen from a radio
                       telescope on Earth or another spacecraft. Required in labels of
                       occultation observations. Normally not intended as a value for a
                       table field.

*  ....................................................................  *

name                   planetary_occultation_flag

value data type        ASCII_Short_String_Collapsed

description            The planetary_occultation_flag is a yes-or-no flag that indicates
                       whether a occultation track also intersects the planet. Required in
                       labels of ring occultation observations. Normally not intended as a
                       value for a table field.

minimum characters     1
maximum characters     1

*  ....................................................................  *

name                   occultation_direction

value data type        ASCII_Short_String_Collapsed

description            occultation_direction indicates the direction of an occultation
                       track. This refers to the observed occultation track overall, not
                       to the subset that might appear in a particular file (e.g., if an
                       occultation includes both ingress and egress tracks, the value for
                       occultation_direction will be both in the data products for each
                       occultation profile. Permitted values are 'ingress', 'egress',
                       'both', and 'multiple'. The value 'multiple' is used where the
                       occultation track is not monotonic over relatively short time
                       scales. Generally only used for some Hubble-based occultations. May
                       be appropriate for extremely long duration occultations of a high
                       proper motion star (e.g., u36). Required in labels of ring
                       occultation observations. Not intended as a value for a table
                       field.

*  ....................................................................  *

name                   star_name

value data type        ASCII_Short_String_Collapsed

description            star_name provides the identifying name of star, including the
                       catalog name if necessary. Examples include 'sigma Sgr' and 'SAO
                       123456' (for star number 123456 in the Smithsonian Astrophysical
                       Observatory catalog). Use 'Sun' for solar occultations. Required in
                       labels for stellar and solar occultations. Not used for radio
                       occultations.

*  ....................................................................  *

name                   radial_resolution

value data type        ASCII_Real

description            radial_resolution indicates the nominal radial distance over which
                       changes in ring properties can be detected within a data product.
                       Note: this value may be larger than the radial_sampling_interval
                       value, because a data product can be over-sampled. Required in
                       labels if the value is fixed, as it is for stellar occultations. If
                       the value varies, the corresponding minimum and maximum attributes
                       must be used instead. Not intended to be used as a table field.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   minimum_radial_resolution

value data type        ASCII_Real

description            minimum_radial_resolution indicates the minimum radial distance
                       over which changes in ring properties can be detected within a data
                       product. Note: this value may be larger than the
                       radial_sampling_interval value, because a data product can be over-
                       sampled. If the value of radial resolution varies, the minimum and
                       maximum radial resolution attributes are required in labels. Not
                       intended to be used as a table field.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   maximum_radial_resolution

value data type        ASCII_Real

description            maximum_radial_resolution indicates the maximum radial distance
                       over which changes in ring properties can be detected within a data
                       product. Note: this value may be larger than the
                       radial_sampling_interval value, because a data product can be over-
                       sampled. If the value of radial resolution varies, the minimum and
                       maximum radial resolution attributes are required in labels. Not
                       intended to be used as a table field.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   ring_intercept_resolution

value data type        ASCII_Real

description            ring_intercept_resolution is the size of edge of a pixel at the
                       distance of the ring intercept point. If the pixel shape is not
                       square, it is defined by the smaller of the two edges. Unlike the
                       quantity ‘radial resolution’, these values are not projected into
                       the ring plane.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   minimum_ring_intercept_resolution

value data type        ASCII_Real

description            minimum_ring_intercept_resolution indicates the smallest value for
                       ring_intercept_resolution in the data product.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   maximum_ring_intercept_resolution

value data type        ASCII_Real

description            maximum_ring_intercept_resolution indicates the largest value for
                       ring_intercept_resolution in the data product.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   radial_sampling_interval

value data type        ASCII_Real

description            radial_sampling_interval indicates the radial spacing between
                       consecutive points in a ring profile. In practice, this may be
                       somewhat smaller than the radial_resolution because a profile may
                       be over-sampled. Required in labels if the value is fixed. If the
                       value varies, the corresponding minimum and and maximum attributes
                       must be used instead. Not intended to be used as a table field.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   minimum_radial_sampling_interval

value data type        ASCII_Real

description            minimum_radial_sampling_interval indicates the smallest radial
                       spacing between consecutive points in a ring profile. In practice,
                       this may be somewhat smaller than the radial_resolution because a
                       profile may be over-sampled. If the value of
                       radial_sampling_interval varies, the minimum and maximum attributes
                       are required in labels. Not intended to be used as a table field.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   maximum_radial_sampling_interval

value data type        ASCII_Real

description            maximum_radial_sampling_interval indicates the smallest radial
                       spacing between consecutive points in a ring profile. In practice,
                       this may be somewhat smaller than the radial_resolution because a
                       profile may be over-sampled. If the value of
                       radial_sampling_interval varies, the minimum and maximum attributes
                       are required in labels. Not intended to be used as a table field.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   ring_plane

value data type        ASCII_Short_String_Collapsed

description            ring_plane indicates the plane upon which parameters such as
                       ring_radius are based. Possible values for the Saturn ring system
                       are 'Equator', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'Phoebe'. For the
                       Uranus ring system values are 'equator', 'six', 'five', 'four',
                       'alpha', 'beta', 'eta', 'gamma', 'delta', 'lambda','epsilon',nu,
                       mu. An additional value, 'individual' is also defined. Note that
                       the named rings of Saturn are in title case while those of Uranus
                       are lower case, consistent with normal usage by the community.
                       Required in labels of ring occultation observations.

*  ....................................................................  *

name                   ring_profile_direction

value data type        ASCII_Short_String_Collapsed

description            ring_profile_direction indicates the radial direction of a ring
                       occultation within a particular data product. Possible values are
                       'Ingress', 'Egress', or 'Multiple'. The value 'Multiple' is used
                       where the occultation track is not monotonic over relatively short
                       time scales. Generally only used for some Hubble-based
                       occultations. May be appropriate for extremely long duration
                       occultations of a high proper motion star (e.g., u36). Required in
                       labels of ring occultation observations. Not intended as a value
                       for a table field.

*  ....................................................................  *

name                   time_series_direction

value data type        ASCII_Short_String_Collapsed

description            time_series_direction indicates the direction the occultation
                       proceeds through the target within a particular data product.
                       Possible values are 'Ingress', 'Egress', 'Both' or 'Multiple'. The
                       value 'Multiple' is used where the occultation track is not
                       monotonic over relatively short time scales. Generally only used
                       for some Hubble-based occultations. May be appropriate for
                       extremely long duration occultations of a high proper motion star
                       (e.g., u36). Not intended as a value for a table field.

*  ....................................................................  *

name                   highest_detectable_opacity

value data type        ASCII_Real

description            highest_detectable_opacity indicates the sensitivity of a ring
                       occultation data set to nearly opaque rings. It specifies the rough
                       value for the largest normal ring opacity that can be detected in
                       the data at the resolution provided, incorporating both statistical
                       effects and calibration uncertainties. Strongly recommended in
                       labels of ring occultation observations. Not intended as a value
                       for a table field.

*  ....................................................................  *

name                   lowest_detectable_opacity

value data type        ASCII_Real

description            lowest_detectable_opacity indicates the sensitivity of a ring
                       occultation data set to nearly opaque rings. It specifies the rough
                       value for the smallest normal ring opacity that can be detected in
                       the data at the resolution provided, incorporating both statistical
                       effects and calibration uncertainties. Strongly recommended in
                       labels of ring occultation observations. Not intended as a value
                       for a table field.

*  ....................................................................  *

name                   background_signal_level
version                1.0

value data type        ASCII_Real

description            background_signal_level indicates the anticipated signal (in
                       counts, counts per second, or other specified units) received when
                       no stellar signal reaches the detector. This is the signal level
                       that indicates an opaque ring. Strongly recommended in labels of
                       ring stellar occultation observations if the value is constant. For
                       stellar occultations, if the value is not constant, strongly
                       recommended to be used as a field in the data table. Normally not
                       used for radio occultations.

*  ....................................................................  *

name                   stellar_signal_level
version                1.0

value data type        ASCII_Real

description            stellar_signal_level indicates the anticipated signal from an un-
                       occulted star, in the absence of any background signal. This is the
                       signal level that defines the difference between a transparent ring
                       and an opaque ring. Strongly recommended in labels of ring stellar
                       occultation observations if the value is constant. For stellar
                       occultations, if the value is not constant, strongly recommended to
                       be used as a field in the data table. Not used for radio
                       occultations.

*  ....................................................................  *

name                   ring_radius
version                1.0

value data type        ASCII_Real

description            ring_radius indicates a radial location within a planetary ring
                       system. Radii are measured from the center of mass of the planet
                       along the nominal ring plane. Units are km and are always positive.
                       Required to be the first field in ring occultation profiles. Data
                       are always organized with ring radius increasing. In labels, the
                       min and max attributes are required.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   minimum_ring_radius

value data type        ASCII_Real

description            minimum_ring_radius indicates the smallest ring radius value in the
                       data table. Units are km and are always positive. Required in label
                       files for ring occultation data.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   maximum_ring_radius

value data type        ASCII_Real

description            maximum_ring_radius indicates the largest ring radius value in the
                       data table. Units are km and are always positive. Required in label
                       files for ring occultation data.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   ring_longitude

value data type        ASCII_Real

description            ring_longitude specifies the inertial longitude of a ring feature
                       relative to the prime meridian. In planetary ring systems, the
                       prime meridian is the ascending node of the planet's invariable
                       plane on the Earth's mean equator of J2000. Longitudes are measured
                       in the direction of orbital motion along the planet's invariable
                       plane to the ring's ascending node, and thence along the ring
                       plane. Values range from 0 to 360 in units of degrees. Note: The
                       invariable plane of a planet is equivalent to its equatorial plane
                       for every ringed planet except Neptune. Required to be the second
                       field in ring occultation profiles. In labels, the min and max
                       attributes are required.

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   minimum_ring_longitude

value data type        ASCII_Real

description            minimum_ring_longitude specifes one boundary for the ring longitude
                       range in the data; normally the smallest value. However, for ranges
                       that cross the prime meridian, the minimum ring longitude will have
                       a value greater than the maximum ring longitude. Values range from
                       0 to 360 in units of degrees. Required in label files for ring
                       occultation data.

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   maximum_ring_longitude

value data type        ASCII_Real

description            maximum_ring_longitude specifies one boundary for the ring
                       longitude range in the data; normally the largest value. However,
                       for ranges that cross the prime meridian, the maximum ring
                       longitude will have a value less than the minimum ring longitude.
                       Values range from 0 to 360 in units of degrees. Required in label
                       files for ring occultation data.

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   ring_longitude_observed_minus_subsolar

value data type        ASCII_Real

description            ring_longitude_observed_minus_subsolar providees the difference
                       between the inertial ring longitude of the observation and inertial
                       ring longitude of the sub-solar point.

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   minimum_ring_longitude_observed_minus_subsolar

value data type        ASCII_Real

description            minimum_ring_longitude_observed_minus_subsolar specifes smallest
                       separation in ring longitude between the observation and the sub-
                       solar point. Required in label files for ring occultation data.

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   maximum_ring_longitude_observed_minus_subsolar

value data type        ASCII_Real

description            maximum_ring_longitude_observed_minus_sub-solar specifes smallest
                       separation in ring longitude between the observation and the
                       subsolar point.

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   observed_ring_elevation

value data type        ASCII_Real

description            observed_ring_elevation is an angle measured at a point in the ring
                       plane, starting from the ring plane to the direction of a photon
                       heading to the observer. This angle is positive on the side of the
                       ring plane defined by positive angular momentum, and negative on
                       the opposite side. Values range from -90 to +90 in units of
                       degrees. This angle is constant for stellar occultations, but may
                       vary significantly during radio occultations. Note: The direction
                       of positive angular momentum points toward the IAU-defined north
                       side of the ring plane for Jupiter, Saturn and Neptune, but IAU-
                       defined south side of the ring plane for Uranus. Required in the
                       label if the value is constant for the observation. If the angle
                       varies for the observation, the min and max attributes are required
                       in the label, and observed_ring_elevation is strongly recommended
                       as a field in the data table. The above definition of
                       observed_ring_elevation is equivalent to the most common usage of
                       the term 'ring open angle', B.

minimum value          -90
maximum value          90

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   minimum_observed_ring_elevation

value data type        ASCII_Real

description            minimum_observed_ring_elevation specifes the smallest value for
                       observed_ring_elevation in the data file. Only used if the value is
                       not constant over the observation. Values range from -90 to +90 in
                       units of degrees. Not intended for use in the data file.

minimum value          -90
maximum value          90

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   maximum_observed_ring_elevation

value data type        ASCII_Real

description            maximum_observed_ring_elevation specifes the largest value for
                       observed_ring_elevation in the data file. Only used if the value is
                       not constant over the observation. Values range from -90 to +90 in
                       units of degrees. Not intended for use in the data file.

minimum value          -90
maximum value          90

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   mean_observed_ring_elevation

value data type        ASCII_Real

description            mean_observed_ring_elevation specifes the mean value for
                       observed_ring_elevation in the data file.

minimum value          -90
maximum value          90

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   emission_angle

value data type        ASCII_Real

description            The emission_angle element provides the value of the angle between
                       the surface normal vector at the intercept point and a vector from
                       the intercept point to the spacecraft. Higher values of
                       emission_angle indicate more oblique viewing of the target. The
                       emission_angle varies from 0 degrees when the spacecraft is viewing
                       the subspacecraft point (nadir viewing) to 90 degrees when the
                       intercept is tangent to the surface of the target body, values in
                       the range of 90 to 180 degrees are possible for ring data.

minimum value          0
maximum value          180

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   minimum_emission_angle

value data type        ASCII_Real

description            The minimum_emission_angle attribute provides the smallest value
                       during the observation for the emission angle at the target.

minimum value          0
maximum value          180

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   maximum_emission_angle

value data type        ASCII_Real

description            The maximum_emission_angle element provides the largest value
                       during the observation for the emission angle at the target.

minimum value          0
maximum value          180

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   incidence_angle

value data type        ASCII_Real

description            The incidence_angle element provides a measure of the lighting
                       condition at the intercept point. Incidence angle is the angle the
                       surface normal vector at the intercept point and a vector from the
                       intercept point to the sun. The incidence_angle varies from 0
                       degrees when the intercept point coincides with the subsolar point
                       to 90 degrees when the intercept is tangent to the surface of the
                       target body, values in the range of 90 to 180 degrees are possible
                       for ring data.

minimum value          0
maximum value          180

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   minimum_incidence_angle

value data type        ASCII_Real

description            The minimum_incidence_angle attribute provides the smallest value
                       during the observation for the incidence angle at the target.

minimum value          0
maximum value          180

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   maximum_incidence_angle

value data type        ASCII_Real

description            The maximum_incidence_angle element provides the largest value
                       during the observation for the incidence angle at the target.

minimum value          0
maximum value          180

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   light_source_incidence_angle

value data type        ASCII_Real

description            light_source_incidence_angle is an angle measured from the local
                       surface normal vector to the direction of a photon arriving from
                       the light source. For rings, the normal vector is that on the same
                       side of the rings as the light source, so values always range
                       between 0 and 90 in units of degrees. The value is always equal to
                       90 - | observed_ring_elevation | This will enable users to perform
                       database searches based on the effective ring opening angle when
                       they are not concerned about the distinction between north-side and
                       southside viewpoints. We have included the 'light source' prefix to
                       the term so that this quantity is not confused with 'incidence
                       angle', a term that is generally associated with sunlight rather
                       than stars or radio transmitters. Required in the label if the
                       value is constant for the observation. If the angle varies for the
                       observation, the min and max attributes are required in the label.
                       Optional as a field in the data table.

minimum value          -90
maximum value          90

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   minimum_light_source_incidence_angle

value data type        ASCII_Real

description            minimum_light_source_incidence_angle specifes the smallest value
                       for light_source_incidence_angle in the observation. Only used if
                       the value is not constant over the observation. Values range from 0
                       to +90 in units of degrees. Not intended for use in the data file.

minimum value          0
maximum value          90

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   maximum_light_source_incidence_angle

value data type        ASCII_Real

description            maximum_light_source_incidence_angle specifes the largest value for
                       light_source_incidence_angle in the observation. Only used if the
                       value is not constant over the observation. Values range from 0 to
                       +90 in units of degrees. Not intended for use in the data file.

minimum value          0
maximum value          90

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   phase_angle
version                1.0

value data type        ASCII_Real

description            The phase_angle element provides a measure of the relationship
                       between the instrument viewing position and incident illumination
                       (such as solar light). Phase angle is measured at the target; it is
                       the angle between a vector to the illumination source and a vector
                       to the instrument. If not specfied, the target is assumed to be at
                       the center of the instrument field of view. If illumination is from
                       behind the instrument, phase_angle will be small.

minimum value          0
maximum value          180

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   minimum_phase_angle

value data type        ASCII_Real

description            The minimum_phase_angle attribute provides the smallest value
                       during the observation for the phase angle at the target.

minimum value          0
maximum value          180

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   maximum_phase_angle

value data type        ASCII_Real

description            The maximum_phase_angle element provides the largest value during
                       the observation for the phase angle at the target.

minimum value          0
maximum value          180

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   mean_phase_angle

value data type        ASCII_Real

description            The mean_phase_angle element provides the mean value during the
                       observation for the phase angle at the target.

minimum value          0
maximum value          180

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   observed_ring_azimuth
version                1.0

value data type        ASCII_Real

description            observed_ring_azimuth is an angle measured at a point in the ring
                       plane, starting from the direction of a photon heading to the
                       observer, and ending at the direction of a local radial vector.
                       This angle is projected into the ring plane and measured in the
                       prograde direction. Note that, as seen from the observer, it equals
                       90 degrees along the right ansa and 270 degrees along the left
                       ansa. Values range from 0 to 360 in units of degrees. Required to
                       be the third field in ring occultation profiles. In labels, the min
                       and max attributes are required.

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   minimum_observed_ring_azimuth

value data type        ASCII_Real

description            minimum_observed_ring_azimuth specifes the smallest value for observed_ring_azimuth in the data file. Values range from 0 to 360 in units of degrees. Required in label files for ring occultation data. 

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   maximum_observed_ring_azimuth

value data type        ASCII_Real

description            maximum_observed_ring_azimuth specifes the largest value for observed_ring_azimuth in the data file. Values range from 0 to 360 in units of degrees. Required in label files for ring occultation data. 

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   sub_stellar_ring_azimuth

value data type        ASCII_Real

description            sub_stellar_ring_azimuth is an angle measured at a point in the ring plane, starting from the direction of a photon arriving from a star, and ending at the direction of a local radial vector. This angle is projected into the ring plane and measured in the prograde direction. Values range from 0 to 360 in units of degrees. For stellar occultation data, this angle is equal to (observed_ring_azimuth + 180) mod 360. It is available only for backward compatibility with previously published Cassini UVIS occultation data analysis; observed_ring_azimuth is the preferred quantity for archiving. sub_stellar_ring_azimuth is an optional data table field for Cassini UVIS occultation data; not recommended for other occultation data. In a label, the min and max variation attributes are optional for Cassini UVIS occultation data; not recommended for other occultation data. 

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   minimum_sub_stellar_ring_azimuth
version                1.0

value data type        ASCII_Real

description            minimum_sub_stellar_ring_azimuth specifes the smallest value for
                       sub_stellar_ring_azimuth in the data file. Values range from 0 to
                       360 in units of degrees. Optional label attribute for Cassini UVIS
                       occultation data; not used for other occultation data.

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   maximum_sub_stellar_ring_azimuth
version                1.0

value data type        ASCII_Real

description            maximum_sub_stellar_ring_azimuth specifes the largest value for
                       sub_stellar_ring_azimuth in the data file. Values range from 0 to
                       360 in units of degrees. Optional label attribute for Cassini UVIS
                       occultation data; not used for other occultation data.

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   sub_stellar_clock_angle

value data type        ASCII_Real

description            sub_stellar_clock_angle is an angle measured at a point in the ring
                       plane, from the direction toward a star to the local radial
                       direction. This angle is projected into the ring plane and measured
                       in the clockwise (retrograde) direction. Equivalently, this is the
                       prograde angle from the local radial direction to the direction
                       toward the star. For stellar occultation data, this angle is equal
                       to (180 - OBSERVED_RING_AZIMUTH) mod 360. It is available only for
                       backward compatibility with previously published Cassini VIMS
                       occultation data analysis; observed_ring_azimuth is the preferred
                       quantity for archiving. sub_stellar_clock_angle is an optional data
                       table field for Cassini VIMS occultation data; not recommended for
                       other occultation data. In a label, the min and max variation
                       attributes are optional for Cassini VIMS occultation data; not
                       recommended for other occultation data.

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   minimum_sub_stellar_clock_angle
version                1.0

value data type        ASCII_Real

description            minimum_sub_stellar_clock_angle specifes the smallest value for
                       sub_stellar_clock_angle in the data file. Values range from 0 to
                       360 in units of degrees. Optional label attribute for Cassini VIMS
                       occultation data; not used for other occultation data.

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   maximum_sub_stellar_clock_angle
version                1.0

value data type        ASCII_Real

description            maximum_sub_stellar_clock_angle specifes the largest value for
                       sub_stellar_clock_angle in the data file. Values range from 0 to
                       360 in units of degrees. Optional label attribute for Cassini VIMS
                       occultation data; not used for other occultation data.

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   wavelength

value data type        ASCII_Real

description            wavelength of the observation. Optional in labels. If the
                       observation is over a wavelength range, use the corresponding
                       minimum and maximum attributes instead.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   minimum_wavelength

value data type        ASCII_Real

description            minimum_wavelength is the smallest wavelength used in the
                       observation. Optional in labels. Used with maximum_wavelength when
                       the observation is over a wavelength range.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   maximum_wavelength

value data type        ASCII_Real

description            maximum_wavelength is the largest wavelength used in the
                       observation. Optional in labels. Used with minimum_wavelength when
                       the observation is over a wavelength range.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   dsn_station_number

value data type        ASCII_Integer

description            dsn_station_number identifies the receiving DSN station. Required
                       in labels for radio occultations; not used for stellar
                       occultations. Nillable in which case the nil_reason should be
                       'inapplicable'. 
                       
nillable               true

*  ....................................................................  *

name                   frequency_band

value data type        ASCII_Short_String_Collapsed

description             The frequency_band attribute provides the one or two letter
                       identifier for the frequency band associated with radio occultation
                       data. Required in labels for radio occultations; not used for
                       stellar occultations.

*  ....................................................................  *

name                   fresnel_scale

value data type        ASCII_Real

description            fresnel_scale is sqrt(lambda * D/2), where lambda is the central
                       wavelength of the observation and D is the average distance between
                       the observer and the occulting ring. This is an average value for
                       the entire occultation and is a measure of the limit on the radial
                       resolution of ring structure due to diffraction. Note that the
                       actual overall resolution is affected as well by the projected
                       diameter of the occulted star and the instrumental time constant,
                       if any.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   projected_star_diameter

value data type        ASCII_Real

description            projected_star_diameter provides the projected angular diameter of
                       the occulted star, from observer to occulting object.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   sigma_projected_star_diameter

value data type        ASCII_Real

description            sigma_projected_star_diameter indicates the uncertainty (1-sigma)
                       in the projected_star_diameter.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   fractional_error_star_counts

value data type        ASCII_Real

description            fractional_error_star_counts indicates the fractional error (1-
                       sigma) in starcounts used for square-well model fit.

*  ....................................................................  *

name                   time_constant_type

value data type        ASCII_Short_String_Collapsed

description            time_constant_type distinguishes between three types of
                       instrumental time constant assumed in a square-well model. This
                       attribute is required if the time_constant attribute is present.

*  ....................................................................  *

name                   time_constant

value data type        ASCII_Real

description            time_constant indicates the instrumental time constant of the
                       detector. See Eq. 9 Elliot et al. (1984) Astron. J. 1587-1603. If
                       this attribute is used them the attribute time_constant_type also
                       must be present.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   sigma_time_constant

value data type        ASCII_Real

description            sigma_time_constant indicates the uncertainty in the time_constant.
                       See Eq. 9 Elliot et al. (1984) Astron. J. 1587-1603. If this
                       attribute is used them the attribute time_constant also must be
                       present.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   pole_right_ascension_angle

value data type        ASCII_Real

description            The right ascension (RA) of the pole of the specified body, given
                       in angular measurements.

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   pole_right_ascension_angle_uncert

value data type        ASCII_Real

description            The uncertainty of the right ascension (RA) of the pole of the
                       specified body, given in angular measurements.

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   pole_declination_angle

value data type        ASCII_Real

description            The declination (Dec) of the pole of the specified body, given in
                       angular measurements.

minimum value          -90
maximum value          90

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   pole_declination_angle_uncert

value data type        ASCII_Real

description            The uncertainty of the declination (Dec) of the pole of the
                       specified body, given in angular measurements.

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   j2

value data type        ASCII_Real

description            The J2 gravitational harmonic coefficient of the body identified in
                       the enclosing class.

*  ....................................................................  *

name                   j4

value data type        ASCII_Real

description            The J4 gravitational harmonic coefficient of the body identified in
                       the enclosing class.

*  ....................................................................  *

name                   j6

value data type        ASCII_Real

description            The J6 gravitational harmonic coefficient of the body identified in
                       the enclosing class.

*  ....................................................................  *

name                   j8

value data type        ASCII_Real

description            The J8 gravitational harmonic coefficient of the body identified in
                       the enclosing class.

*  ....................................................................  *

name                   gmass

value data type        ASCII_Real

description            The product of the Gravitational constant and the mass of the
                       identified body.

unit of measure type   Units_of_Gmass

*  ....................................................................  *

name                   grav_ref_radius

value data type        ASCII_Real

description            The reference radius for the gravitational harmonic coefficients of
                       the body identified in the enclosing class.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   epoch_ring_fit_utc

value data type        ASCII_Date_Time_YMD_UTC

description            The epoch for the ring orbital elements given in this product.
                       Format is YYYY-MM-DDTHH:MM:SS.SSSZ and may be truncated.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   semimajor_axis

value data type        ASCII_Real

description            The semimajor axis of the orbit of the body or ring identified in
                       the enclosing class.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   semimajor_axis_uncert

value data type        ASCII_Real

description            The uncertainty in the value for the semimajor axis of the orbit of
                       the body or ring identified in the enclosing class.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   eccentricity

value data type        ASCII_Real

description            The eccentricity of the orbit of the body or ring identified in the
                       enclosing class.

*  ....................................................................  *

name                   eccentricity_uncert

value data type        ASCII_Real

description            The uncertainty in the value for the eccentricity of the orbit of
                       the body or ring identified in the enclosing class.

*  ....................................................................  *

name                   periapse_longitude

value data type        ASCII_Real

description            The longitude of periapse for the orbit of the body or ring
                       identified in the enclosing class.

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   periapse_longitude_uncert

value data type        ASCII_Real

description            The uncertainty in the value for the longitude of periapse for the
                       orbit of the body or ring identified in the enclosing class.

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   periapse_precession_rate

value data type        ASCII_Real

description            The precession rate of the periapse of the orbit of the body or
                       ring identified in the enclosing class.

unit of measure type   Units_of_Angular_Velocity

*  ....................................................................  *

name                   periapse_precession_rate_uncert

value data type        ASCII_Real

description            The uncertainty in the value for the periapse precession rate of
                       the orbit of the body or ring identified in the enclosing class.

unit of measure type   Units_of_Angular_Velocity

*  ....................................................................  *

name                   periapse_precession_rate_method

value data type        ASCII_Integer

description            A flag indicating the constraints used to determine the periapse
                       precession rate of the orbit of the body or ring identified in the
                       enclosing class.

*  ....................................................................  *

name                   inclination

value data type        ASCII_Real

description            The inclination of the orbit of the body or ring identified in the
                       enclosing class.

minimum value          0
maximum value          180

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   inclination_uncert

value data type        ASCII_Real

description            The uncertainty in the value for the inclination of the orbit of
                       the body or ring identified in the enclosing class.

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   node_longitude

value data type        ASCII_Real

description            The longitude of the ascending node of the orbit of the body or
                       ring identified in the enclosing class.

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   node_longitude_uncert

value data type        ASCII_Real

description            The uncertainty in the value for the longitude of the ascending
                       node of the orbit of the body or ring identified in the enclosing
                       class.

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   nodal_regression_rate

value data type        ASCII_Real

description            The regression rate of the node of the orbit of the body or ring
                       identified in the enclosing class.

unit of measure type   Units_of_Angular_Velocity

*  ....................................................................  *

name                   nodal_regression_rate_uncert

value data type        ASCII_Real

description            The uncertainty in the value for the periapse precession rate of
                       the orbit of the body or ring identified in the enclosing class.

unit of measure type   Units_of_Angular_Velocity

*  ....................................................................  *

name                   nodal_regression_rate_method

value data type        ASCII_Integer

description            A flag indicating the constraints used to determine the node
                       regression rate of the orbit of the body or ring identified in the
                       enclosing class.

*  ....................................................................  *

name                   number_points

value data type        ASCII_Integer

description            Number of fitted data points for the orbit of the body or ring
                       identified in the enclosing class.

*  ....................................................................  *

name                   fit_rms_semimajor

value data type        ASCII_Real

description            The RMS residuals for the semimajor axis of the body or ring
                       identified in the enclosing class.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   normal_mode_amplitude

value data type        ASCII_Real

description            The amplitude of the normal mode for the ring identified in the
                       enclosing class. A value of -9.99X10^99 indicates there is no
                       normal mode for the ring.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   normal_mode_amplitude_uncert

value data type        ASCII_Real

description            The uncertainty in the value for the normal mode of the ring
                       identified in the enclosing class. A value of -9.99X10^99 indicates
                       there is no normal mode for the ring.

unit of measure type   Units_of_Length

*  ....................................................................  *

name                   normal_mode_phase

value data type        ASCII_Real

description            The phase of the normal mode at epoch specified by
                       epoch_ring_fit_utc for the ring identified in the enclosing class.
                       A value of -9.99X10^99 indicates there is no normal mode for the
                       ring.

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   normal_mode_phase_uncert

value data type        ASCII_Real

description            The uncertainty in the value for the normal_mode_phase of the ring
                       identified in the enclosing class. A value of -9.99X10^99 indicates
                       there is no normal mode for the ring.

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   normal_mode_pattern_speed

value data type        ASCII_Real

description            The pattern speed of the normal mode in the ring identified in the
                       enclosing class. A value of -9.99X10^99 indicates there is no
                       normal mode for the ring.

unit of measure type   Units_of_Angular_Velocity

*  ....................................................................  *

name                   normal_mode_pattern_speed_uncert

value data type        ASCII_Real

description            The uncertainty in the pattern speed of the normal mode in the ring
                       identified in the enclosing class. A value of -9.99X10^99 indicates
                       there is no normal mode for the ring.

unit of measure type   Units_of_Angular_Velocity

*  ....................................................................  *

name                   normal_mode_wavenumber

value data type        ASCII_Integer

description            The wave number of the normal mode in the ring identified in the
                       enclosing class. A value of -999 indicates there is no normal mode
                       for the ring.

*  ....................................................................  *

name                   reprojection_plane

value data type        ASCII_Short_String_Collapsed

description            reprojection_plane identifies the plane onto which the reprojection
                       is based. Possible values for the Saturn ring system are 'Equator',
                       'Laplace', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'Phoebe'. For the
                       Uranus ring system values are 'Equator', 'Laplace', 'Six', 'Five',
                       'Four', 'Alpha', 'Beta', 'Eta', 'Gamma', 'Delta',
                       'Lambda','Epsilon',Nu, Mu. Required in labels of ring reprojection
                       products.

*  ....................................................................  *

name                   epoch_reprojection_basis_utc

value data type        ASCII_Date_Time_YMD_UTC

description            The basis epoch for the reprojection used in this product. Format
                       is YYYY-MM-DDTHH:MM:SS.SSSZ and may be truncated.

unit of measure type   Units_of_Time

*  ....................................................................  *

name                   corotating_flag

value data type        ASCII_Short_String_Collapsed

description            The corotating_flag is a yes-or-no flag that indicates whether or
                       not a corotating frame is used. a table field.

minimum characters     1
maximum characters     1

*  ....................................................................  *

name                   corotation_rate

value data type        ASCII_Real

description            The co-rotation rate associated with the data. 


unit of measure type   Units_of_Angular_Velocity

*  ....................................................................  *

name                   corotating_ring_longitude
version                1.0

value data type        ASCII_Real

description            The ring longitude in the rotating frame. The with zero longitude
                       defined at the epoch specified by epoch_reprojection_basis_utc,
                       zero longitude in the corotating frame at time t corresponds to an
                       inertial longitude of (t-epoch)*corotation_rate.

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   minimum_corotating_ring_longitude

value data type        ASCII_Real

description            The minimum value in this product for ring longitude in the
                       rotating frame. The with zero longitude defined at the epoch
                       specified by epoch_reprojection_basis_utc, zero longitude in the
                       corotating frame at time t corresponds to an inertial longitude of
                       (t-epoch)*corotation_rate.

minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

*  ....................................................................  *

name                   maximum_corotating_ring_longitude

value data type        ASCII_Real

description            The maximum value in this product for ring longitude in the
                       rotating frame. The with zero longitude defined at the epoch
                       specified by epoch_reprojection_basis_utc, zero longitude in the
                       corotating frame at time t corresponds to an inertial longitude of
                       (t-epoch)*corotation_rate.


minimum value          0
maximum value          360

unit of measure type   Units_of_Angle

