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Table: ls_dr8.survey_ccds_kd_n
(The bold columns are indexed columns)
| Column Name | Description | Datatype |
|---|---|---|
| airmass | float32 Airmass of observation (measured at the telescope bore-sight) | REAL |
| camera | The camera that took this image e.g. "90prime" | VARCHAR |
| ccd_cuts | (ignore) | BIGINT |
| ccddecoff | Median astrometric offset for the CCD | REAL |
| ccddecrms | rms in astrometric offset for the CCD | REAL |
| ccdname | char[5] CCD name, e.g. "N10", "S7" for DECam | VARCHAR |
| ccdnastrom | Number of stars (after sigma-clipping) used to compute astrometric correction | SMALLINT |
| ccdnphotom | Number of Gaia plus PS1 stars detected with signal-to-noise ratio greater than five | SMALLINT |
| ccdphrms | Photometric rms for the CCD (in mag) | REAL |
| ccdraoff | Median astrometric offset for the CCD | REAL |
| ccdrarms | rms in astrometric offset for the CCD | REAL |
| ccdskycounts | Mean sky count level per pixel in the CP-processed frames measured (with iterative rejection) for each CCD in the image section [500:1500,1500:2500] | REAL |
| ccdskysb | Sky surface brightness (in AB mag/arcsec2) | REAL |
| ccdzpt | Zeropoint for the CCD (AB mag) | REAL |
| cd1_1 | Astrometric header value: transformation matrix | REAL |
| cd1_2 | Astrometric header value: transformation matrix | REAL |
| cd2_1 | Astrometric header value: transformation matrix | REAL |
| cd2_2 | Astrometric header value: transformation matrix | REAL |
| crpix1 | Astrometric header value: X reference pixel | REAL |
| crpix2 | Astrometric header value: Y reference pixel | REAL |
| crval1 | Astrometric header value: RA of reference pixel | DOUBLE |
| crval2 | Astrometric header value: Dec of reference pixel | DOUBLE |
| dec | Approximate Dec center of this CCD (deg) | DOUBLE |
| dec_bore | Telescope boresight Dec of this exposure (deg) | DOUBLE |
| elat | Ecliptic Latitude | DOUBLE |
| elon | Ecliptic Longitude | DOUBLE |
| expnum | Exposure number, eg 348224 | BIGINT |
| exptime | float32 Exposure time in seconds, eg 30 | REAL |
| filter | Filter used for observation, eg "g ", "r", "z" | CHAR |
| fwhm | FWHM (in pixels) measured by the CP | REAL |
| glat | Galactic Latitude | DOUBLE |
| glon | Galactic Longitude | DOUBLE |
| height | Height in pixels of this image, eg 4096 | SMALLINT |
| htm9 | HTM Index (order 9 => ~10 arcminsize) | INTEGER |
| image_filename | Path to FITS image, e.g. "north/DECam_CP/CP20170729/c4d_170730_045351_ooi_g_v1.fits.fz" | VARCHAR |
| image_hdu | FITS HDU number in the image_filename file where this image can be found | SMALLINT |
| mjd_obs | float64 Date of observation in MJD (in UTC system), eg 56884.99373389 | DOUBLE |
| nest4096 | HEALPIX Index (Nsides 4096, Nest scheme => ~52 arcsec size) | INTEGER |
| object | Name listed in the object tag from the CCD header | VARCHAR |
| plprocid | Unique, time-based, CP processing hash - see the plprocid page for how to convert this to a date | VARCHAR |
| plver | Community Pipeline (CP) version number | VARCHAR |
| procdate | CP processing date | VARCHAR |
| propid | NOIRLab Proposal ID that took this image, eg "2014B-0404" | VARCHAR |
| ra | Approximate RA center of this CCD (deg) | DOUBLE |
| ra_bore | float64 Telescope boresight RA of this exposure (deg) | DOUBLE |
| ring256 | HEALPIX index (Nsides 256 => ~14 arcmin size) | INTEGER |
| sig1 | Median per-pixel error standard deviation, in nanomaggies | REAL |
| skyrms | Sky rms for the entire image (in counts) | REAL |
| width | Width in pixels of this image, eg 2046 | SMALLINT |
| yshift | (ignore; it is always False) | SMALLINT |
| zpt | Median zero point for the entire image (median of all CCDs of the image), eg 25.0927 | REAL |
