VisitDetector
Defines a single detector of a visit.
Columns
| name | datatype | description | unit | nullable | ivoa:ucd | tap:principal | votable:arraysize | votable:xtype | length | precision |
|---|---|---|---|---|---|---|---|---|---|---|
| visit primary key | long | Reference to the corresponding entry in the Visit table. | true | 0 | ||||||
| decl | double | Deprecated duplicate of dec. | deg | true | 0 | |||||
| midpoint | timestamp | Midpoint of the visit. TAI, accurate to 10ms. | true | 0 | * | timestamp | 6 | |||
| midpointMjdTai | double | Midpoint of the visit, expressed as Modified Julian Date, International Atomic Time, accurate to 10ms. | d | true | 0 | |||||
| obsStartMjdTai | double | Start of the visit, expressed as Modified Julian Date, International Atomic Time, accurate to 10ms. | true | 0 | ||||||
| detector primary key | short | Detector ID. A detector associated with a particular instrument (not an observation of that detector). | true | 1 | ||||||
| physical_filter | char | ID of physical filter, the filter associated with a particular instrument. | true | meta.id;instr.filter | 0 | * | 32 | |||
| 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 | |||
| ra | double | Right Ascension of Ccd center. | deg | true | 1 | |||||
| dec | double | Declination of Ccd center. | deg | true | 1 | |||||
| pixelScale | float | Measured detector pixel scale. | arcsec/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 | |||||
| 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 | |||||
| skyBg | float | Average sky background. | adu | true | 0 | |||||
| skyNoise | float | RMS noise of the sky background. | adu | true | 0 | |||||
| seeing | double | Mean measured FWHM of the PSF. | arcsec | true | 1 | |||||
| skyRotation | double | Sky rotation angle. | deg | true | 0 | |||||
| expTime | double | Spatially-averaged duration of visit, accurate to 10ms. | s | true | 1 | |||||
| obsStart | timestamp | Start of the visit, TAI, accurate to 10ms. | true | 0 | * | timestamp | 6 | |||
| darkTime | double | Average dark current accumulation time, accurate to 10ms. | s | true | 0 | |||||
| xSize | long | Number of columns in the image. | pixel | true | 0 | |||||
| ySize | long | Number of rows in the image. | pixel | true | 0 | |||||
| llcra | double | Right Ascension of lower left corner. | deg | true | 0 | |||||
| llcdec | double | Declination of lower left corner. | deg | true | 0 | |||||
| ulcra | double | Right Ascension of upper left corner. | deg | true | 0 | |||||
| ulcdec | double | Declination of upper left corner. | deg | true | 0 | |||||
| urcra | double | Right Ascension of upper right corner. | deg | true | 0 | |||||
| urcdec | double | Declination of upper right corner. | deg | true | 0 | |||||
| lrcra | double | Right Ascension of lower right corner. | deg | true | 0 | |||||
| lrcdec | double | Declination of lower right corner. | deg | true | 0 | |||||
| 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 | |||||
| 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 | ||||||
| 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 | ||||||
| starKurtosisMedian | double | Kurtosis-like higher-order moment combination (median M40 + 2*M22 + M04 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 | ||||||
| nPsfStar | int | Number of stars used for PSF model | true | 0 | ||||||
| psfStarDeltaE1Median | double | Median E1 residual (starE1 - psfE1) for psf stars | true | 0 | ||||||
| psfStarDeltaE2Median | double | Median E2 residual (starE2 - psfE2) for psf stars | true | 0 | ||||||
| psfStarDeltaE1Scatter | double | Scatter (via MAD) of E1 residual (starE1 - psfE1) 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 | |||||
| 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 | ||||||
| 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 | ||||||
| maxDistToNearestPsf | double | Maximum distance of an unmasked pixel to its nearest model psf star (pixel) | pixel | true | 0 | |||||
| starEMedian | double | Median ellipticity (sqrt(starE1**2.0 + starE2**2.0)) 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 | |||||
| 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 | |||||
| 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 | |||||
| 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 | |||||
| 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 | |||||
| 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 | ||||||
| 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 | |||||
| shapeletsStarEMedian | double | Median ellipticity (sqrt(starE1**2.0 + starE2**2.0)) of the sources used in the shapelet decomposition. | true | 0 | ||||||
| psfAdaptiveIncludeThresholdMultiplier | double | Threshold multiplier used in the adaptive threshold detection pass for PSF modelling. | 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 | |||||
| refCatSourceDensity | float | Source density for the detector region as computed from the loaded reference catalog (number per degrees**2) | count/deg**2 | true | 0 | |||||
| psfAdaptiveThresholdValue | double | Threshold value used in the adaptive threshold detection pass for PSF modelling. | 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 | ||||||
| nShapeletsStar | int | Number of sources used in the shapelet decomposition. | true | 0 |