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Table: smash_dr2.exposure
(The bold columns are indexed columns)
| Column Name | Description | Datatype |
|---|---|---|
| airmass | Airmass | REAL |
| alf_depth | Median ALLFRAME depth across all chips, instrumental mags | REAL |
| alf_nsources | Total number of DAOPHOT/ALLFRAME sources in frame | INTEGER |
| apcor | Aperture correction | REAL |
| badsoln | Did we have a good transformation equation/solution for these data | SMALLINT |
| dao_depth | Median ALLSTAR depth across all chips, instrumental mags | REAL |
| dao_nsources | Total number of DAOPHOT/ALLSTAR sources in frame | INTEGER |
| dao_psfchi | Median DAOPHOT PSF chi value across all chips | REAL |
| dateobs | Observation timestamp: YYYY-MM-DDTHH:MM:SS.SSSSSS | CHAR |
| dec | Declination at center of frame (in degrees) | DOUBLE |
| ebv | Median SFD E(B-V) across frame | REAL |
| elat | Ecliptic latitude | DOUBLE |
| elon | Ecliptic longitude | DOUBLE |
| expnum | Eight-digit exposure number | CHAR |
| exptime | Exposure time in seconds | REAL |
| fieldid | SMASH Field ID | SMALLINT |
| filter | Filter, u, g, r, i, or z | CHAR |
| fwhm | FWHM of PSF (i.e. seeing) in pixels, median across chips | REAL |
| gaiawcsrms | RMS in WCS fit w.r.t. GAIA catalog in arcsec, median of chips | REAL |
| glat | Galactic latitude of field, in degrees | DOUBLE |
| glon | Galactic longitude of field, in degrees | DOUBLE |
| htm9 | HTM index (order 9 => ~10 arcmin size) | INTEGER |
| mjd | Observation Modified Julian Date | DOUBLE |
| nchips | Number of chips with good data for this exposure, normally 60 or 61 | INTEGER |
| nest4096 | HEALPIX index (Nsides 4096, Nest scheme => ~52 arcsec size) | INTEGER |
| night_mjd | Night Modified Julian Date (integer) | INTEGER |
| photometric | Is this from a photometric night | SMALLINT |
| ra | Right ascension at center of frame (in degrees) | DOUBLE |
| ring256 | HEALPix ring nside=256 index | INTEGER |
| skymode | Median sky background level across chips | REAL |
| skysig | Median sigma in sky background across chips | REAL |
| wcsrms | RMS in WCS fit w.r.t. ref catalog in arcsec, median of chips | REAL |
| wcstype | WCS type, always TPV | CHAR |
