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Table: ls_dr7.survey_ccds
(The bold columns are indexed columns)
Column NameDescriptionDatatype
cameraThe camera that took this image, e.g. decamVARCHAR
ccddecoffMedian astrometric offset for the CCD in arcsec.REAL
ccddecrmsrms in astrometric offset for the CCD in arcsecREAL
ccdnameCCD name (see DECam layout), e.g. N10 or S7VARCHAR
ccdnmatchNumber of matches for the CCDSMALLINT
ccdphrmsPhotometric rms for the CCD (in mag)REAL
ccdraoffMedian astrometric offset for the CCD in arcsec.REAL
ccdrarmsrms in astrometric offset for the CCD in arcsecREAL
ccdskycountsMean 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
ccdzptZeropoint for the CCD (AB mag).REAL
cd1_1Astrometric header value: transformation matrix.REAL
cd1_2Astrometric header value: transformation matrix.REAL
cd2_1Astrometric header value: transformation matrix.REAL
cd2_2Astrometric header value: transformation matrix.REAL
crpix1Astrometric header value: X reference pixel.REAL
crpix2Astrometric header value: Y reference pixel.REAL
crval1Astrometric header value: RA of reference pixel.DOUBLE
crval2Astrometric header value: Dec of reference pixel.DOUBLE
decDeclination at epoch J2000DOUBLE
dec_boreTelescope boresight Dec of this exposure (deg).DOUBLE
elatEcliptic LatitudeDOUBLE
elonEcliptic LongitudeDOUBLE
expnumUnique DECam exposure number, e.g. 348244BIGINT
exptimeExposure time in seconds, e.g. 30REAL
filterFilter used for observation, e.g. g, r, zCHAR
fwhm[use seeing instead]REAL
glatGalactic LatitudeDOUBLE
glonGalactic LongitudeDOUBLE
heightHeight in pixels of this image, eg 4096.SMALLINT
htm9HTM index (order 9 => ~10 arcmin size)INTEGER
image_filenamePath to FITS image, eg decam/CP20140810_g_v2/c4d_140815_235218_ooi_g_v2.fits.fz.VARCHAR
image_hduFITS HDU number in the image_filename file where this image can be found.SMALLINT
mjd_obsDate of observation in MJD (in UTC system), eg 56884.99373389.DOUBLE
nest4096HEALPIX index (Nsides 4096, Nest scheme => ~52 arcsec size)INTEGER
objectName listed in the object tag from the CCD headerVARCHAR
propidNOAO Proposal ID that took this image, eg 2014B-0404.VARCHAR
raRight ascension at epoch J2000DOUBLE
ra_boreTelescope boresight RA of this exposure (deg).DOUBLE
ring256HEALPIX index (Nsides 256 => ~14 arcmin size)INTEGER
sig1Median per-pixel error standard deviation, in nanomaggiesREAL
skyrmsSky rms for the entire image (in counts)REAL
widthWidth in pixels of this image, eg 2046.SMALLINT
yshift(ignore; it is always False)SMALLINT
zptMedian zero point for the entire image (median of all CCDs of the image), eg 25.0927.REAL