NIRCam primary dither specification with number of points and possible point packing, included when an FGS External Calibration dither is in parallel with NIRCam Engineering Imaging. Possible values are: 3TIGHT, 3, 6, 9, 15, 21, 27, 36, 45 (FULL); 2TIGHTGAPS, 3TIGHTGAPS, 4TIGHT, 4, 5TIGHT, 6TIGHT, 6, 8NIRSPEC (FULLBOX); 3, 4, 6, 8, 12, 16 (INTRAMODULE); 2-16 (INTRAMODULEBOX, INTRAMODULEX); 2, 3, 4, 5, 7, 9, 13, 17, 25 (INTRASCA); 2, 3, 4 (SUBARRAY_DITHER); 1, 2PLUS, 2MINUS (WFSC)
| Attribute | Value |
|---|---|
| data type | string |
| enumerated Values | ['1-17', '21', '25', '27', '36', '45', '2MINUS', '2PLUS', '2TIGHTGAPS', '3TIGHT', '3TIGHTGAPS', '4TIGHT', '5TIGHT', '6TIGHT', '8NIRSPEC'] |
| units | |
| example | |
| default value | |
| special processing | OPTIONAL |
| source | Proposal and Planning System (PPS) |
| software source | |
| calculation | |
| DB destination | ['NircamScience.pridtype'] |
| data type in DB | nvarchar(20) |
| instrument | NIRCAM |
| mode | ['NRC_IMAGE', 'NRC_WFSS', 'NRC_FLAT'] |
| product level | 1b |
| FITS hdu | PRIMARY |
| FITS header section | Dither |