| AIRMASS_KEY | str | FITS header keyword containing the airmass | |
| ASTRCLIP_NSIGMA | float | Clipping boundry for the second astrometric pass in standard deviations | |
| ASTREF_BAND | str | Column name of photometric band used for astrometric reference magnitudes or one of: DEFAULT, BLUEST, REDDEST | |
| ASTREF_CATALOG | str | Name of reference catalog for astrometry, one of: NONE, FILE, USNO-A1, USNO-A2, USNO-B1, GSC-1.3, GSC-2.2, UCAC-1, UCAC-2, NOMAD-1, 2MASS, DENIS-3, SDSS-R3, SDSS-R5, SDSS-R6 | |
| ASTREF_WEIGHT | float | Relative weight of the astrometric reference catalog | |
| ASTREFCAT_NAME | str | Filenames of local astrometric reference catalogs, used when ASTREF_CATALOG is set to FILE | |
| ASTREFCENT_KEYS | str | Column names containing the coordinates in degrees of the centroids of each source for the reference catalog(s), used when ASTREF_CATALOG is set to FILE | |
| ASTREFERR_KEYS | str | Column names containing the major axis, minor axis, and position angle in pixels, respectively, of the error ellipses for the reference catalog(s), used when ASTREF_CATALOG is set to FILE | |
| ASTREFMAG_KEY | str | Column name containing the astrometric reference magnitudes, used when ASTREF_CATALOG is set to FILE | |
| ASTRINSTRU_KEY | str | FITS header keyword(s) defining the astrometric context/instrument | |
| CENTROID_KEYS | str | Column names containing the coordinates in degrees of the centroids of each source for the input ctalog(s) | |
| CENTROIDERR_KEYS | str | Column names containing the major axis, minor axis, and position angle in pixels, respectively, of the error ellipses for the input catalog(s) | |
| CORRECT_COLOURSHIFTS | str | Correct for colour shifts | |
| CROSSID_RADIUS | float | Search radius used for all cross-identifications | arcsec |
| DISTORT_DEGREES | int | Polynomial degree of each group | |
| DISTORT_GROUPS | int | Polynomial group that each DISTORT_KEY belongs to | |
| DISTORT_KEYS | str | Column names or FITS keywords (indicated by a colon prefix) containing measurements used to map astrometric distortions for the input catalog(s) | |
| EXPOTIME_KEY | str | FITS header keyword containing the exposure time | |
| FGROUP_RADIUS | float | Maximum angular distance allowed between field centers to include them in the same group of fields | deg |
| FIXFOCALPLANE_NMIN | int | Minimum number of detections per focal plane array required to be part of MOSAIC_TYPE FIX_FOCALPLANE statistics | |
| FLAGS_MASK | str | Binary mask applied to FLAGS column to reject flagged detections | |
| FWHM_THRESHOLDS | float | Range of Full-Width at Half-Maximum allowed for input detections | pixel |
| HEADER_SUFFIX | str | Filename extension of output header files | |
| HEADER_TYPE | str | Type of WCS information in output header files, one of: NORMAL, FOCAL_PLANE | |
| IMAFLAGS_MASK | str | Binary mask applied to IMAFLAGS column to reject flagged detections | |
| MAGZERO_INTERR | float | Internal zero-point accuracy | mag |
| MAGZERO_KEY | str | FITS header keyword containing the zero-point | |
| MAGZERO_OUT | float | Arbitrary magnitude zero-point for output flux scale | mag |
| MAGZERO_REFERR | float | Photometric field zero-point accuracy | mag |
| MATCH | str | Do pattern-matching of input detections with sources from the astrometric reference catalog (i.e., preastrom) | |
| MATCH_FLIPPED | str | Consider a possible flipping of input frames during MATCHing | |
| MATCH_NMAX | int | Maximum number of detections used to compute the position angle and pixel scale while MATCHing (0=auto) | |
| MATCH_RESOL | float | MATCHing resolution (0.0=auto) | arcsec |
| MERGEDOUTCAT_NAME | str | Filename of merged output catalog (i.e., astrometrically corrected input catalog) | |
| MERGEDOUTCAT_TYPE | str | Type of the merged output catalog, one of: NONE, ASCII_HEAD, ASCII, FITS, FITS_LDAC | |
| MOSAIC_TYPE | str | Type of pre-processing for mosaics of focal plane arays, one of: UNCHANGED, SAME_CRVAL, SHARE_PROJAXIS, FIX_FOCALPLANE, LOOSE | |
| PHOTCLIP_NSIGMA | float | Clipping boundry for the second photometric pass in standard deviations | |
| PHOTFLUX_KEY | str | Column name containg the flux measurement for the input catalog(s) | |
| PHOTFLUXERR_KEY | str | Column name containg the flux error estimate for the input catalog(s) | |
| PHOTINSTRU_KEY | str | FITS header keyword(s) defining the photometric context/instrument | |
| PIXSCALE_MAXERR | float | Search range of the pixel scale factor used in astrometric MATCHing (e.g., 1.2 is equivalent to +/- 20% of the original pixel scale) | |
| POSANGLE_MAXERR | float | Search range for the position angle in astrometric MATCHing | deg |
| POSITION_MAXERR | float | Search range for the position in astrometric MATCHing | arcmin |
| REFOUT_CATPATH | str | Directory name where downloaded reference catalogs will be saved | |
| SAVE_REFCATALOG | str | Save a copy of the downloaded astrometric reference catalogs in FITS_LDAC format to REFOUT_CATPATH | |
| SN_THRESHOLDS | float | The pair of signal-to-noise ratio (S/N) thresholds (in standard deviations) indicating the minumum threshold for the sample of all sources and of high-S/N sources, respectively | |
| SOLVE_ASTROM | str | Compute astrometric solution in 2 passes, or just compute statistics | |
| SOLVE_PHOTOM | str | Compute photometric solution in 2 passes, or just compute statistics | |
| STABILITY_TYPE | str | Type of stability of the astrometric instrument, one of: EXPOSURE, GROUP, INSTRUMENT, FILE | |
| VERBOSE_TYPE | str | Degree of verbosity output, one of: QUIET, NORMAL, LOG or FULL | |
| WEIGHTFLAGS_MASK | str | Binary mask applied to FLAGS_WEIGHT column to reject flagged detections | |
