The observation number is three character number that specifies an observation within a parallel proposal (note: large numbers of observations are expected per proposal). The observation number is found in both the visit and observation IDs.
| Attribute | Value |
|---|---|
| data type | string |
| enumerated Values | not defined |
| units | |
| example | 004 |
| default value | |
| special processing | VALUE_REQUIRED |
| source | Science Image Header |
| software source | |
| calculation | OBS_ID[7-9] |
| DB destination | ['ScienceCommon.observtn', 'GuideStar.observtn'] |
| data type in DB | smallint |
| instrument | Multiple |
| mode | All |
| product level | 1a |
| FITS hdu | PRIMARY |
| FITS header section | Observation identifiers |