SUBPXPTS

Number of points in subpixel dither pattern

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