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Table: ls_dr3.survey_ccds
(The bold columns are indexed columns)
| Column Name | Description | Datatype |
|---|---|---|
| airmass | Airemass, e.g. 1.35 | REAL |
| arawgain | Average gain for this CCD, eg 4.34. | REAL |
| avsky | Average sky level in this image, in ADU, eg 36.9324 | REAL |
| camera | The camera that took this image, e.g. decam | CHAR |
| ccddecoff | Median astrometric offset for the CCD | REAL |
| ccdmdncol | Median (g-i) color from the PS1 catalog of the matched stars. | REAL |
| ccdname | CCD name (see DECam layout), e.g. N10 or S7 | CHAR |
| ccdnmatch | Number of stars matched to PS1 catalog of matched stars | SMALLINT |
| ccdnmatcha | Number of stars in amp A matched | SMALLINT |
| ccdnmatchb | Number of stars in amp B matched | SMALLINT |
| ccdnstar | Number of stars founds on the CCD | SMALLINT |
| ccdnum | CCD number (see DECam layout), eg 1 | SMALLINT |
| ccdphoff | (ignore) | REAL |
| ccdphrms | Photometric rms for the CCD (in mag). | REAL |
| ccdraoff | Median 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 |
| ccdskymag | Mean sky background in AB mag/arcsec^2 on each CCD | REAL |
| ccdskyrms | Sky rms (in counts) | REAL |
| ccdtransp | (ignore) | REAL |
| ccdzpt | Zeropoint for the CCD (AB mag). | REAL |
| ccdzpta | Zeropoint for amp A (AB mag). | REAL |
| ccdzptb | Zeropoint for amp B (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 |
| date_obs | Date of observation start, eg 2014-08-15. Can be combined with ut, or use mjd_obs instead | CHAR |
| dec | Approximate Dec center of this CCD (deg). | DOUBLE |
| dec_bore | Telescope boresight Dec of this exposure (deg). | DOUBLE |
| expid | Exposure ID string, e.g. 00348224-S29 (from expnum and ccdname) | CHAR |
| expnum | Unique DECam exposure number, e.g. 348244 | INTEGER |
| 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 |
| ha | Hour angle of the observation (HH:MM:SS) | CHAR |
| height | Height in pixels of this image, eg 4096. | SMALLINT |
| image_filename | Path to FITS image, eg decam/CP20140810_g_v2/c4d_140815_235218_ooi_g_v2.fits.fz. | CHAR |
| 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 |
| object | Name listed in the object tag from the CCD header | CHAR |
| propid | NOAO Proposal ID that took this image, eg 2014B-0404. | CHAR |
| ra | Approximate RA center of this CCD (deg). | DOUBLE |
| ra_bore | Telescope boresight RA of this exposure (deg). | DOUBLE |
| seeing | Seeing in arcseconds determined by fitting a 2-dimensional gaussian to the median PSF of stars on the CCD, eg 1.1019. | REAL |
| temp | Outside temperature in C listed in the OUTTEMP tag in the CCD image header. | REAL |
| ut | Time of observation start, eg 23:50:58.608241. | CHAR |
| width | Width in pixels of this image, eg 2046. | SMALLINT |
| zpt | Median zero point for the entire image (median of all CCDs of the image), eg 25.0927. | REAL |
