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Table: ls_dr7.survey_ccds
(The bold columns are indexed columns)
| Column Name | Description | Datatype |
|---|---|---|
| camera | The camera that took this image, e.g. decam | VARCHAR |
| ccd_cuts | (ignore) | BIGINT |
| ccddecoff | Median astrometric offset for the CCD | REAL |
| ccddecrms | rms in astrometric offset for the CCD | REAL |
| ccdname | CCD name (see DECam layout), e.g. N10 or S7 | VARCHAR |
| ccdnmatch | Number of matches for the CCD | 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 |
| 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 | Declination at epoch J2000 | DOUBLE |
| dec_bore | Telescope boresight Dec of this exposure (deg). | DOUBLE |
| elat | Ecliptic Latitude | DOUBLE |
| elon | Ecliptic Longitude | DOUBLE |
| expnum | Unique DECam exposure number, e.g. 348244 | BIGINT |
| exptime | Exposure time in seconds, e.g. 30 | REAL |
| filter | Filter used for observation, e.g. g, r, z | CHAR |
| fwhm | [use seeing instead] | 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 arcmin size) | INTEGER |
| image_filename | Path to FITS image, eg decam/CP20140810_g_v2/c4d_140815_235218_ooi_g_v2.fits.fz. | VARCHAR |
| image_hdu | FITS HDU number in the image_filename file where this image can be found. | SMALLINT |
| mjd_obs | 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 |
| propid | NOAO Proposal ID that took this image, eg 2014B-0404. | VARCHAR |
| ra | Right ascension at epoch J2000 | DOUBLE |
| ra_bore | 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 |
