VisitDetector

Per-detector metadata and metrics associated with each visit

Columns

name datatype description unit nullable ivoa:ucd tap:column_index tap:principal votable:arraysize votable:xtype length precision
astromOffsetMean double Mean offset of astrometric calibration matches (arcsec) arcsec true 0
astromOffsetStd double Standard deviation of offsets of astrometric calibration matches (arcsec) arcsec true 0
band char Name of the band used to take the visit where this source was measured. Abstract filter that is not associated with a particular instrument. true meta.id;instr.bandpass 1 * 1
centroidDiffShapeletsVsSlotMedian double Median centroid difference (sqrt((slot_x - shapelet_x)**2 + (slot_y - shapelet_y)**2)) for sources used in the shapelet decomposition. pixel true 0
darkTime double Average dark current accumulation time, accurate to 10ms. s true 0
dec double Declination of Ccd center. deg true 1
detector long Detector ID. A detector associated with a particular instrument (not an observation of that detector). true 1
effTime double Effective time metric s true 0
effTimePsfSigmaScale double Effective time metric -- PSF size component true 0
effTimeSkyBgScale double Effective time metric -- Sky background component true 0
effTimeZeroPointScale double Effective time metric -- Throughput component true 0
expMidpt timestamp Midpoint time for exposure at the fiducial center of the focal plane array. TAI, accurate to 10ms. true 6 0 * timestamp 6
expMidptMJD double Midpoint time for exposure at the fiducial center of the focal plane array in MJD. TAI, accurate to 10ms. d true time.epoch;obs.exposure 5 1
expTime double Spatially-averaged duration of visit, accurate to 10ms. s true 1
llcdec double Declination of lower left corner. deg true 0
llcra double Right Ascension of lower left corner. deg true 0
lrcdec double Declination of lower right corner. deg true 0
lrcra double Right Ascension of lower right corner. deg true 0
magLim double 5-sigma limiting magnitude mag true 1
maxDistToNearestPsf double Maximum distance of an unmasked pixel to its nearest model psf star (pixel) pixel true 0
nPsfStar int Number of stars used for PSF model true 0
nShapeletsStar int Number of sources used in the shapelet decomposition. true 0
obsStart timestamp Start of the visit, TAI, accurate to 10ms. true 0 * timestamp 6
obsStartMJD double Start of the exposure in MJD, TAI, accurate to 10ms. d true time.start;obs.exposure 7 0
physical_filter char ID of physical filter, the filter associated with a particular instrument. true meta.id;instr.filter 0 * 32
pixelScale float Measured detector pixel scale. arcsec/pixel true 0
psfAdaptiveIncludeThresholdMultiplier double Threshold multiplier used in the adaptive threshold detection pass for PSF modelling. true 0
psfAdaptiveThresholdValue double Threshold value used in the adaptive threshold detection pass for PSF modelling. true 0
psfApCorrSigmaScaledDelta double Delta (max - min) of psf flux aperture correction factors scaled (divided) by the psfSigma evaluated on a grid of unmasked pixels true 0
psfApFluxDelta double Delta (max - min) of model psf aperture flux (with aperture radius of max(2, 3*psfSigma)) values evaluated on a grid of unmasked pixels true 0
psfSigma float PSF model second-moments determinant radius (center of chip) pixel true 1
psfArea double Effective area of the PSF model (center of chip) pixel**2 true 0
psfIxx double PSF model second-moments Ixx (center of chip) pixel**2 true 0
psfIyy double PSF model second-moments Iyy (center of chip) pixel**2 true 0
psfIxy double PSF model second-moments Ixy (center of chip) pixel**2 true 0
psfStarDeltaE1Median double Median E1 residual (starE1 - psfE1) for psf stars true 0
psfStarDeltaE1Scatter double Scatter (via MAD) of E1 residual (starE1 - psfE1) for psf stars true 0
psfStarDeltaE2Median double Median E2 residual (starE2 - psfE2) for psf stars true 0
psfStarDeltaE2Scatter double Scatter (via MAD) of E2 residual (starE2 - psfE2) for psf stars true 0
psfStarDeltaSizeMedian double Median size residual (starSize - psfSize) for psf stars (pixel) pixel true 0
psfStarDeltaSizeScatter double Scatter (via MAD) of size residual (starSize - psfSize) for stars (pixel) pixel true 0
psfStarScaledDeltaSizeScatter double Scatter (via MAD) of size residual scaled by median size squared true 0
psfTraceRadiusDelta double Delta (max - min) of model psf trace radius values evaluated on a grid of unmasked pixels (pixel) pixel true 0
ra double Right Ascension of Ccd center. deg true 1
refCatSourceDensity float Source density for the detector region as computed from the loaded reference catalog (number per degrees**2) count/deg**2 true 0
seeing double Mean measured FWHM of the PSF. arcsec true 1
shapeletsIqScore double The dimensionless image quality score as determined from the shapelets decomposition that includes power from the median centroid offset between those used in the decomposition and those of the centroid slot in addition to non-atmospheric decomposition coefficients. The score spans the range [0.0, 1.0] with lower values indicating better image quality. true 0
shapeletsOnlyIqScore double The dimensionless image quality score as determined from the shapelets decomposition that includes power only from the non-atmospheric decomposition coefficients. The score spans the range [0.0, 1.0] with lower values indicating better image quality. true 0
shapeletsStarEMedian double Median ellipticity (sqrt(starE1**2.0 + starE2**2.0)) of the sources used in the shapelet decomposition. true 0
shapeletsStarUnNormalizedEMedian double Median un-normalized ellipticity (sqrt((starXX - starYY)**2.0 + (2.0*starXY)**2.0)) of the sources used in the shapelet decomposition. pixel**2 true 0
skyBg float Average sky background. adu true 0
skyNoise float RMS noise of the sky background. adu true 0
skyRotation double Sky rotation angle. deg true 0
starComa1Median double Coma-like higher-order moment combination (median M30 + M12 of the stars used in the PSF model) true 0
starComa2Median double Coma-like higher-order moment combination (median M21 + M03 of the stars used in the PSF model) true 0
starE41Median double Fourth-order ellipticity-like higher-order moment combination (median M40 - M04 of the stars used in the PSF model) true 0
starE42Median double Fourth-order ellipticity-like higher-order moment combination (median 2*(M31 + M13) of the stars used in the PSF model) true 0
starEMedian double Median ellipticity (sqrt(starE1**2.0 + starE2**2.0)) of the stars used in the PSF model. true 0
starKurtosisMedian double Kurtosis-like higher-order moment combination (median M40 + 2*M22 + M04 of the stars used in the PSF model) true 0
starTrefoil1Median double Trefoil-like higher-order moment combination (median M30 - 3*M12 of the stars used in the PSF model) true 0
starTrefoil2Median double Trefoil-like higher-order moment combination (median 3*M21 - M03 of the stars used in the PSF model) true 0
starUnNormalizedEMedian double Median un-normalized ellipticity (sqrt((starXX - starYY)**2.0 + (2.0*starXY)**2.0)) of the stars used in the PSF model. pixel**2 true 0
ulcdec double Declination of upper left corner. deg true 0
ulcra double Right Ascension of upper left corner. deg true 0
urcdec double Declination of upper right corner. deg true 0
urcra double Right Ascension of upper right corner. deg true 0
visitId long Reference to the corresponding entry in the Visit table. true meta.id.parent;obs 2 1
wcsCornerMaxOffset double Maximum distance between the preliminary and final WCS at the corners of the detector. The WCS is set to null if this exceeds 0.5". arcsec true 0
wcsDetectorPointingResidual double Maximum difference (on the pointing-fit grid) between the final WCS position and the position predicted by camera geometry, after re-pointing using the final WCS for this detector only. The detector is rejected from the pointing fit if this exceeds 10". arcsec true 0
wcsPreliminaryDetectorPointingResidual double Maximum difference (on the pointing-fit grid) between the preliminary WCS position and the position predicted by camera geometry, after re-pointing using the prelimnary WCS for this detector only. The detector is rejected from the pointing fit if this exceeds 10". arcsec true 0
wcsPreliminaryVisitPointingResidual double Maximum difference (on the pointing-fit grid) between the preliminary WCS position and the position predicted by camera geometry, after re-pointing using the preliminary WCS of all non-rejected detectors in the visit. The WCS is set to null if this exceeds 60". arcsec true 0
wcsVisitPointingResidual double Maximum difference (on the pointing-fit grid) between the final WCS position and the position predicted by camera geometry, after re-pointing using the final WCS of all non-rejected detectors in the visit. The WCS is set to null if this exceeds 60". arcsec true 0
wcsSIPDeltaSky double Maximum on-sky difference between the WCS and its FITS TAN-SIP approximation, evaluated by mapping detector pixel positions to sky coordinates using each and comparing. arcsec true 0
wcsSIPDeltaPixel double Maximum pixel-space difference between the WCS and its FITS TAN-SIP approximation, evaluated by mapping sky coordinates to detector pixel positions using each and comparing. pixel true 0
xSize long Number of columns in the image. pixel true 0
ySize long Number of rows in the image. pixel true 0
zenithDistance float Zenith distance at observation mid-point. deg true 1
zeroPoint float Zero-point for the Ccd, estimated at Ccd center. mag true 0