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Table: ls_dr7.randoms_dr7
(The bold columns are indexed columns)
Column NameDescriptionDatatype
bricknameName of brick, encoding the brick sky position, e.g. 1126p222 near RA=112.6, Dec=+22.2VARCHAR(n)
decDeclination at epoch J2000DOUBLE
ebvGalactic extinction (E(B-V)) reddening from SFD98, used to compute DECAM_MW_TRANSMISSION and WISE_MW_TRANSMISSIONREAL
elatEcliptic LatitudeDOUBLE
elonEcliptic LongitudeDOUBLE
galdepth_gAs for PSFDEPTH_G but for a galaxy (0.45 arcsec exp, round) detection sensitivityREAL
galdepth_rAs for PSFDEPTH_R but for a galaxy (0.45 arcsec exp, round) detection sensitivityREAL
galdepth_zAs for PSFDEPTH_Z but for a galaxy (0.45 arcsec exp, round) detection sensitivityREAL
glatGalactic LatitudeDOUBLE
glonGalactic LongitudeDOUBLE
hpxpixelHEALPixel containing this location at NSIDE=64 in the NESTED schemeBIGINT
htm9HTM index (order 9 => ~10 arcmin size)INTEGER
maskbitsBitwise mask indicating that an object touches a pixel in the coadd/*/*/*maskbits* maps see http://legacysurvey.org/dr7/bitmasks/SMALLINT
nest4096HEALPIX index (Nsides 4096, Nest scheme => ~52 arcsec sizeINTEGER
nobs_gNumber of images that contribute to the central pixel in (g): filter for this object (not profile-weighted)SMALLINT
nobs_rNumber of images that contribute to the central pixel in (r): filter for this object (not profile-weighted)SMALLINT
nobs_zNumber of images that contribute to the central pixel in (z): filter for this object (not profile-weighted)SMALLINT
psfdepth_gFor a (5sigma) point source detection limit in (g), (5/sqrt(mathrm{PSFDEPTH_G})) gives flux in nanomaggies and (-2.5[log_{10}(5 / sqrt(mathrm{PSFDEPTH_G})) - 9]) gives corresponding magnitudeREAL
psfdepth_rFor a (5sigma) point source detection limit in (g), (5/sqrt(mathrm{PSFDEPTH_R})) gives flux in nanomaggies and (-2.5[log_{10}(5 / sqrt(mathrm{PSFDEPTH_R})) - 9]) gives corresponding magnitudeREAL
psfdepth_zFor a (5sigma) point source detection limit in (g), (5/sqrt(mathrm{PSFDEPTH_Z})) gives flux in nanomaggies and (-2.5[log_{10}(5 / sqrt(mathrm{PSFDEPTH_Z})) - 9]) gives corresponding magnitudeREAL
raRight ascension at epoch J2000DOUBLE
ring256HEALPIX index (Nsides 256, Ring scheme => ~14 arcmin size)INTEGER


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