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Table: ls_dr7.randoms_dr7
(The bold columns are indexed columns)
| Column Name | Description | Datatype |
|---|---|---|
| brickname | Name of brick, encoding the brick sky position, e.g. 1126p222 near RA=112.6, Dec=+22.2 | VARCHAR |
| dec | Declination at epoch J2000 | DOUBLE |
| ebv | Galactic extinction \(E(B-V)\) reddening from SFD98, used to compute DECAM_MW_TRANSMISSION and WISE_MW_TRANSMISSION | REAL |
| elat | Ecliptic Latitude | DOUBLE |
| elon | Ecliptic Longitude | DOUBLE |
| galdepth_g | As for PSFDEPTH_G but for a galaxy (0.45 arcsec exp, round) detection sensitivity | REAL |
| galdepth_r | As for PSFDEPTH_R but for a galaxy (0.45 arcsec exp, round) detection sensitivity | REAL |
| galdepth_z | As for PSFDEPTH_Z but for a galaxy (0.45 arcsec exp, round) detection sensitivity | REAL |
| glat | Galactic Latitude | DOUBLE |
| glon | Galactic Longitude | DOUBLE |
| hpxpixel | HEALPixel containing this location at NSIDE=64 in the NESTED scheme | BIGINT |
| htm9 | HTM index (order 9 => ~10 arcmin size) | INTEGER |
| maskbits | Bitwise mask indicating that an object touches a pixel in the coadd/*/*/*maskbits* maps see http://legacysurvey.org/dr7/bitmasks/ | SMALLINT |
| nest4096 | HEALPIX index (Nsides 4096, Nest scheme => ~52 arcsec size | INTEGER |
| nobs_g | Number of images that contribute to the central pixel in \(g\): filter for this object (not profile-weighted) | SMALLINT |
| nobs_r | Number of images that contribute to the central pixel in \(r\): filter for this object (not profile-weighted) | SMALLINT |
| nobs_z | Number of images that contribute to the central pixel in \(z\): filter for this object (not profile-weighted) | SMALLINT |
| psfdepth_g | For a \(5\sigma\) 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 magnitude | REAL |
| psfdepth_r | For a \(5\sigma\) 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 magnitude | REAL |
| psfdepth_z | For a \(5\sigma\) 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 magnitude | REAL |
| ra | Right ascension at epoch J2000 | DOUBLE |
| ring256 | HEALPIX index (Nsides 256, Ring scheme => ~14 arcmin size) | INTEGER |
