The visit group is a 2 character indentifier that specifies a group within a visit file (used for parallel synchronization). It is included in the observation ID, in order to trace the exposure to the commanding request and uniquely identify the exposure.
| Attribute | Value |
|---|---|
| data type | string |
| enumerated Values | not defined |
| units | |
| example | 01 |
| default value | |
| special processing | VALUE_REQUIRED |
| source | Science Image Header |
| software source | |
| calculation | OBS_ID[22-23] |
| DB destination | ['ScienceCommon.visitgrp'] |
| data type in DB | nchar(2) |
| instrument | Multiple |
| mode | All |
| product level | 1a |
| FITS hdu | PRIMARY |
| FITS header section | Observation identifiers |