Number of points in FGS subpixel dither pattern. When FGS is the only instrument, possible values are: 1, 2, 4. When FGS External Calibration is in parallel with NIRCam Engineering Imaging, possible values are: 1-9, 12, 16, 20, 24, 30, 36, 48, 64. When FGS External Calibration is in parallel with NIRISS External Calibration, possible values are: 1, 5, 9, 25.
| Attribute | Value |
|---|---|
| data type | integer |
| enumerated Values | not defined |
| units | |
| example | 1 |
| default value | 1 |
| special processing | not defined |
| source | Proposal and Planning System (PPS) |
| software source | PPS:dms_dithers_view.subpixel_positions |
| calculation | |
| DB destination | ['ScienceCommon.subpxpts'] |
| data type in DB | smallint |
| instrument | FGS |
| mode | ['FGS_IMAGE', 'FGS_DARK', 'FGS_SKYFLAT', 'FGS_INTFLAT'] |
| product level | 1b |
| FITS hdu | PRIMARY |
| FITS header section | Dither |