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Table: ls_dr3.ccds_annotated
(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 |
| blacklist_ok | We blacklisted certain programs (Proposal IDs) from other PIs where there were a large number of images covering a single patch of sky, because our pipeline code did not handle the extreme depth very well. True if this CCD was not blacklisted, ie, was used. | SMALLINT |
| 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 |
| 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 coord of CCD center | DOUBLE |
| decam_extinction_1 | Extinction for DECam filter u | REAL |
| decam_extinction_2 | Extinction for DECam filter g | REAL |
| decam_extinction_3 | Extinction for DECam filter r | REAL |
| decam_extinction_4 | Extinction for DECam filter i | REAL |
| decam_extinction_5 | Extinction for DECam filter z | REAL |
| decam_extinction_6 | Extinction for DECam filter Y | REAL |
| dra | Maximum distance from RA,Dec center to the edge midpoints, in RA | REAL |
| ebv | SFD E(B-V) extinction for CCD center | REAL |
| 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 |
| galdepth | 5-sigma galaxy (0.45 arcsec round exp) detection depth in AB mag | REAL |
| galnorm_mean | Norm of the PSF model convolved by a 0.45 arcsec 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). x1 value. | 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). y0 value. | 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). y1 value. | SMALLINT |
| ha | Hour angle of the observation (HH:MM:SS) | CHAR |
| height | Height in pixels of this image, eg 4096. | SMALLINT |
| htm9 | HTM index (order 9 => ~10 arcmin size) | INTEGER |
| humidity | Percent humidity outside | REAL |
| 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 |
| maxsky | Max of our sky level | REAL |
| meansky | Our pipeline (not the CP) estimate of the sky level, average over the image, in ADU | REAL |
| minsky | Min of our sky level | REAL |
| mjd_obs | Date of observation in MJD (in UTC system), eg 56884.99373389. | DOUBLE |
| nest256 | HEALPIX index (Nsides 256 => ~14 arcmin size) | INTEGER |
| object | Name listed in the object tag from the CCD header | CHAR |
| outtemp | Outside temperature (deg C) | REAL |
| photometric | True if this CCD was considered photometric and used in the DR3 reductions | SMALLINT |
| 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 |
| plver | Community Pipeline (CP) PLVER version string | CHAR |
| propid | NOAO Proposal ID that took this image, eg 2014B-0404. | CHAR |
| 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) | 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 coord of CCD center | DOUBLE |
| ring256 | HEALPIX index (Nsides 256 => ~14 arcmin size) | INTEGER |
| seeing | Seeing in arcseconds determined by fitting a 2-dimensional gaussian to the median PSF of stars on the CCD, eg 1.1019. | REAL |
| sig1 | Median per-pixel error standard deviation, in nanomaggies | REAL |
| stdsky | Standard deviation of our sky level | REAL |
| temp | Outside temperature in C listed in the OUTTEMP tag in the CCD image header. | REAL |
| tileebv | Mean SFD E(B-V) extinction in the DECaLS tile, or 0 for non-DECaLS data | REAL |
| tileid | DECaLS tile number, if this was a DECaLS observation; or 0 for data from other programs | INTEGER |
| tilepass | DECaLS tile pass number, 1, 2 or 3, if this was a DECaLS observation, or 0 for data from other programs. Set by the observers; pass 1 is supposed to be photometric with good seeing, pass 3 unphotometric or bad seeing, and pass 2 in between. | SMALLINT |
| ut | Time of observation start, eg 23:50:58.608241. | CHAR |
| width | Width in pixels of this image, eg 2046. | SMALLINT |
| wise_extinction_1 | Extinction for WISE bands W1 | REAL |
| wise_extinction_2 | Extinction for WISE bands W2 | REAL |
| wise_extinction_3 | Extinction for WISE bands W3 | REAL |
| wise_extinction_4 | Extinction for WISE bands W4 | REAL |
| zpt | Median zero point for the entire image (median of all CCDs of the image), eg 25.0927. | REAL |
