| Description: The operating mode of the instrument. For most HST data products, this is the value of FITS keyword OBSMODE. Consult the relevant HST handbooks for details about each mode. For FGS data files, this attribute should be nil with nilReason = "inapplicable". |
| Namespace Id: hst | Steward: rings | Class Name: Operational_Parameters | Type: ASCII_Short_String_Collapsed |
| Minimum Value: None | Maximum Value: None | Minimum Characters: 1 | Maximum Characters: 255 |
| Unit of Measure Type: None | Default Unit Id: None | Attribute Concept: None | Conceptual Domain: SHORT_STRING |
| Status: Active | Nillable: true | Pattern: None |
| Permissible Value(s) | No Values | |