Guide star centroid x position in FGS ideal coordinate frame (arcsec). Science Data Processing code (SDP) calculates this from the guide star position at the actual time of exposure from centroid data in the ACS (ENG telemetry).
| Attribute | Value |
|---|---|
| data type | float |
| enumerated Values | not defined |
| units | arcsec |
| example | 42.1234 |
| default value | |
| special processing | OPTIONAL |
| source | Engineering Service |
| software source | |
| calculation | calculated by SPD; averaged over exposure |
| DB destination | ['GuideStar.gscentx'] |
| data type in DB | float |
| instrument | Multiple |
| mode | All |
| product level | 1b |
| FITS hdu | PRIMARY |
| FITS header section | Guide star Information |