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Table: ls_dr9.ccds_annotated
(The bold columns are indexed columns)
| Column Name | Description | Datatype |
|---|---|---|
| airmass | Airmass of observation (measured at the telescope bore-sight) | REAL |
| annotated | True unless there is an error when computing the annotated quantities in this row of the file | SMALLINT |
| camera | The camera that took this image (X is 7 for 90prime, 6 for mosaic and 5 for decam) | VARCHAR |
| ccd_cuts | Bit mask describing CCD image quality (see https://www.legacysurvey.org/dr9/bitmasks/) | BIGINT |
| ccddecoff | Median astrometric offset for the CCD | REAL |
| ccddecrms | rms in astrometric offset for the CCD | REAL |
| ccdname | CCD name, e.g. N10, S7 for DECam (X is 4 for 90prime and mosaic CCDs, and 3 for decam) | VARCHAR |
| ccdnastrom | Number of stars (after sigma-clipping) used to compute astrometric correction | SMALLINT |
| ccdnphotom | Number of Gaia+PS1 stars detected with signal-to-noise ratio greater than five | 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 counts level per second per pixel (AVSKY divided by EXPTIME) in the CP-processed frames measured (with iterative rejection) for each CCD in the image section [500:1500,1500:2500] | REAL |
| ccdskysb | Sky surface brightness (in AB mag/arcsec2) | 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 |
| ddec | Maximum distance from RA,Dec center to the edge midpoints, in Dec | REAL |
| dec | Approximate Dec center of this CCD (deg) | DOUBLE |
| dec0 | Dec coordinate of pixel (1,1) | DOUBLE |
| dec1 | Dec coordinate of pixel (1,H) | DOUBLE |
| dec2 | Dec coordinate of pixel (W,H) | DOUBLE |
| dec3 | Dec coordinate of pixel (W,1) | DOUBLE |
| dec_bore | Telescope boresight Dec of this exposure (deg) | DOUBLE |
| dec_center | Dec coordinate of CCD center | DOUBLE |
| decam_extinction_1 | Extinction for optical filter u | REAL |
| decam_extinction_2 | Extinction for optical filter g | REAL |
| decam_extinction_3 | Extinction for optical filter r | REAL |
| decam_extinction_4 | Extinction for optical filter i | REAL |
| decam_extinction_5 | Extinction for optical filter z | REAL |
| decam_extinction_6 | Extinction for optical filter Y | REAL |
| dra | Maximum distance from RA,Dec center to the edge midpoints, in RA | REAL |
| ebv | SFD98 E(B-V) extinction for CCD center | REAL |
| expnum | Exposure number, eg 348224 | BIGINT |
| exptime | Exposure time in seconds, eg 30 | REAL |
| filter | Filter used for observation, eg g, r, z | CHAR |
| fwhm | FWHM (in pixels) measured by the CP | REAL |
| galdepth | 5-sigma galaxy (0.45 arcs round exp) detection depth in AB mag | REAL |
| galnorm_mean | Norm of the PSF model convolved by a 0.45 arcs exponential galaxy | REAL |
| galnorm_std | Standard deviation of galaxy norm | REAL |
| gaussgaldepth | 5-sigma galaxy detection depth in AB mag, using Gaussian PSF approximation | REAL |
| gausspsfdepth | 5-sigma PSF detection depth in AB mag, using Gaussian PSF approximation (using seeing value) | REAL |
| good_region_1 | If only a subset of the CCD images was used, this array of x0,x1,y0,y1 values gives the coordinates that were used, [x0,x1), [y0,y1). -1 for no cut (most CCDs) | SMALLINT |
| good_region_2 | If only a subset of the CCD images was used, this array of x0,x1,y0,y1 values gives the coordinates that were used, [x0,x1), [y0,y1). -1 for no cut (most CCDs) | SMALLINT |
| good_region_3 | If only a subset of the CCD images was used, this array of x0,x1,y0,y1 values gives the coordinates that were used, [x0,x1), [y0,y1). -1 for no cut (most CCDs) | SMALLINT |
| good_region_4 | If only a subset of the CCD images was used, this array of x0,x1,y0,y1 values gives the coordinates that were used, [x0,x1), [y0,y1). -1 for no cut (most CCDs) | SMALLINT |
| height | Height in pixels of this image, eg 4096 | SMALLINT |
| humidity | Outside humidity percentage | REAL |
| image_filename | Path to FITS image, e.g. north/DECam_CP/CP20170729/c4d_170730_045351_ooi_g_v1.fits.fz | VARCHAR |
| image_hdu | FITS HDU number in the image_filename file where this image can be found | SMALLINT |
| ls_ccd_id | Unique CCD Id | BIGINT |
| maxsky | Max of our sky level, in nanomaggies | REAL |
| meansky | Our pipeline (not the CP) estimate of the sky level, average over the image, in nanomaggies | REAL |
| minsky | Min of our sky level, in nanomaggies | REAL |
| 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 | VARCHAR |
| outtemp | Outside temperature (deg C) | REAL |
| phrms | Median photometric rms across all CCDs in the image (in mag) | REAL |
| pixscale_max | Max of pixel scale | REAL |
| pixscale_mean | Pixel scale (via sqrt of area of a 10x10 pixel patch evaluated in a 5x5 grid across the image), in arcsec/pixel | REAL |
| pixscale_min | Min of pixel scale | REAL |
| pixscale_std | Standard deviation of pixel scale | REAL |
| plprocid | Unique, time-based, CP processing hash - see the plprocid page for how to convert this to a date | VARCHAR |
| plver | Community Pipeline (CP) version number | VARCHAR |
| procdate | CP processing date | VARCHAR |
| propid | Proposal ID of the program that took this image, eg 2014B-0404 | VARCHAR |
| psf_a | PSF model major axis (pixels) | REAL |
| psf_b | PSF model minor axis (pixels) | REAL |
| psf_ell | PSF ellipticity 1 - minor/major | REAL |
| psf_mx2 | PSF model second moment in x (pixels^2) | REAL |
| psf_mxy | PSF model second moment in x-y (pixels^2) | REAL |
| psf_my2 | PSF model second moment in y (pixels^2) | REAL |
| psf_theta | PSF position angle (deg) | REAL |
| psfdepth | 5-sigma PSF detection depth in AB mag, using PsfEx PSF model | REAL |
| psfnorm_mean | PSF norm = 1/sqrt of N_eff = sqrt(sum(psf_i^2)) for normalized PSF pixels i; mean of the PSF model evaluated on a 5x5 grid of points across the image. Point-source detection standard deviation is sig1/psfnorm. | REAL |
| psfnorm_std | Standard deviation of PSF norm | REAL |
| ra | Approximate RA center of this CCD (deg) | DOUBLE |
| ra0 | RA coordinate of pixel (1,1)...Note that the ordering of the CCD corners is detailed here | DOUBLE |
| ra1 | RA coordinate of pixel (1,H) | DOUBLE |
| ra2 | RA coordinate of pixel (W,H) | DOUBLE |
| ra3 | RA coordinate of pixel (W,1) | DOUBLE |
| ra_bore | Telescope boresight RA of this exposure (deg) | DOUBLE |
| ra_center | RA coordinate of CCD center | DOUBLE |
| sig1 | Median per-pixel error standard deviation, in nanomaggies | REAL |
| skyrms | Sky rms for the entire image (in counts/second | REAL |
| stdsky | Standard deviation of our sky level, in nanomaggies | REAL |
| tileebv | Mean SFD98 E(B-V) extinction in the tile, 0 for data from programs other than BASS, MzLS or DECaLS | REAL |
| tileid | Tile number, 0 for data from programs other than MzLS or DECaLS | INTEGER |
| tilepass | Tile pass number, 1, 2 or 3, if this was an MzLS or DECaLS observation, or 0 for data from other programs. Set by the observers (the meaning of tilepass is on the https://www.legacysurvey.org/status/) | SMALLINT |
| width | Width in pixels of this image, eg 2046 | SMALLINT |
| wise_extinction_1 | Extinction for WISE band W1 | REAL |
| wise_extinction_2 | Extinction for WISE band W2 | REAL |
| wise_extinction_3 | Extinction for WISE band W3 | REAL |
| wise_extinction_4 | Extinction for WISE band W4 | REAL |
| yshift | (ignore; its always False) | SMALLINT |
| zpt | Median zero point for the entire image (median of all CCDs of the image), eg 25.0927 | REAL |
