The eleven character visit_id, <PPPPP><OOO><VVV>, uniquely indentifies the visit and consists of the program, observation and visit destinations. This visit_id is explicitly embedded in the file name and also included in the Science Image header and footer in the Recorded Science Data file
| Attribute | Value |
|---|---|
| data type | string |
| enumerated Values | not defined |
| units | |
| example | 80600004001 |
| default value | |
| special processing | VALUE_REQUIRED |
| source | Science Image Header |
| software source | |
| calculation | OBS_ID[2-12] |
| DB destination | ['ScienceCommon.visit_id', 'GuideStar.visit_id'] |
| data type in DB | nvarchar(11) |
| instrument | Multiple |
| mode | All |
| product level | 1a |
| FITS hdu | PRIMARY |
| FITS header section | Observation identifiers |