Primary dither specification with number of points and possible point packing. Different types are available depending on whether NIRCam is the only instrument in operation or is the prime instrument with MIRI or NIRISS in parallel, as well as whether NIRCam is observing in imaging or WFSS mode. When NIRCam is in WFSS mode with MIRI or NIRISS parallel imaging, the only available specifications are the numerical values 2 through 16.
| Attribute | Value |
|---|---|
| data type | string |
| enumerated Values | ['2MINUS', '2PLUS', '2TIGHTGAPS', '3TIGHT', '3TIGHTGAPS', '4TIGHT', '5TIGHT', '6TIGHT', '8NIRSPEC', '1-17', '21', '25', '27', '36', '45'] |
| units | |
| example | |
| default value | |
| special processing | OPTIONAL |
| source | Proposal and Planning System (PPS) |
| software source | PPS:dms_dithers_view.primary_dithers |
| 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 |