Source

Properties of detections on the single-epoch visit images, performed independently of the Object detections on coadded images.

Columns

name datatype description unit nullable ivoa:ucd votable:arraysize length
parentSourceId long Unique ID of parent source true
x double Centroid from Sdss Centroid algorithm pixel true
y double Centroid from Sdss Centroid algorithm pixel true
xErr float 1-sigma uncertainty on x position pixel true
yErr float 1-sigma uncertainty on y position pixel true
ra double Position in right ascension. deg true pos.eq.ra;meta.main
dec double Position in declination. deg true pos.eq.dec;meta.main
raErr float Angular error in right ascension (∂RA*cos(Dec)). deg true stat.error;pos.eq.ra
decErr float Error in declination. deg true stat.error;pos.eq.dec
ra_dec_Cov float Covariance between right ascension (RA*cos(Dec)) and declination. deg**2 true stat.covariance;pos.eq.ra;pos.eq.dec
calibFlux double Flux within 12.0-pixel radius aperture nJy true
calibFluxErr double Flux uncertainty within 12.0-pixel radius aperture nJy true
ap03Flux double Flux within 3.0-pixel radius aperture nJy true
ap03FluxErr double Flux uncertainty within 3.0-pixel radius aperture nJy true
ap03Flux_flag boolean General Failure Flag true
ap06Flux double Flux within 6.0-pixel radius aperture nJy true
ap06FluxErr double Flux uncertainty within 6.0-pixel radius aperture nJy true
ap06Flux_flag boolean General Failure Flag true
ap09Flux double Flux within 9.0-pixel radius aperture nJy true
ap09FluxErr double Flux uncertainty within 9.0-pixel radius aperture nJy true
ap09Flux_flag boolean General Failure Flag true
ap12Flux double Flux within 12.0-pixel radius aperture nJy true
ap12FluxErr double Flux uncertainty within 12.0-pixel radius aperture nJy true
ap12Flux_flag boolean General Failure Flag true
ap17Flux double Flux within 17.0-pixel radius aperture nJy true
ap17FluxErr double Flux uncertainty within 17.0-pixel radius aperture nJy true
ap17Flux_flag boolean General Failure Flag true
ap25Flux double Flux within 25.0-pixel radius aperture nJy true
ap25FluxErr double Flux uncertainty within 25.0-pixel radius aperture nJy true
ap25Flux_flag boolean General Failure Flag true
ap35Flux double Flux within 35.0-pixel radius aperture nJy true
ap35FluxErr double Flux uncertainty within 35.0-pixel radius aperture nJy true
ap35Flux_flag boolean General Failure Flag true
ap50Flux double Flux within 50.0-pixel radius aperture nJy true
ap50FluxErr double Flux uncertainty within 50.0-pixel radius aperture nJy true
ap50Flux_flag boolean General Failure Flag true
ap70Flux double Flux within 70.0-pixel radius aperture nJy true
ap70FluxErr double Flux uncertainty within 70.0-pixel radius aperture nJy true
ap70Flux_flag boolean General Failure Flag true
sky double Background in annulus of radius 7-15 times the PSF sigma around source nJy true
skyErr double Error in background in annulus around source nJy true
psfFlux double Flux derived from linear least-squares fit of psf model forced on the calexp nJy true
psfFluxErr double Uncertainty on the flux derived from linear least-squares fit of psf model forced on the calexp nJy true
ixx double HSM moments pixel**2 true
iyy double HSM moments pixel**2 true
ixy double HSM moments pixel**2 true
ixxPSF double HSM moments pixel**2 true
iyyPSF double HSM moments pixel**2 true
ixyPSF double HSM moments pixel**2 true
ixxDebiasedPSF double HSM moments pixel**2 true
iyyDebiasedPSF double HSM moments pixel**2 true
ixyDebiasedPSF double HSM moments pixel**2 true
gaussianFlux double Flux from Gaussian Flux algorithm nJy true
gaussianFluxErr double Flux uncertainty from Gaussian Flux algorithm nJy true
extendedness double PSF to cModel flux-ratio measure of whether an object is point-like (0) or extended (1); values are either 0 or 1. true
sizeExtendedness double Moments-based measure of a source to be a galaxy. true
blendedness_abs double Measure of how much the flux is affected by neighbors, (1 - child_flux/parent_flux). Operates on the absolute value of the pixels to try to obtain a de-noised value. See section 4.9.11 of Bosch et al. 2018, PASJ, 70, S5 for details. true
blendedness_flag boolean General Failure Flag true
blendedness_flag_noCentroid boolean Object has no centroid true
blendedness_flag_noShape boolean Object has no shape true
apFlux_12_0_flag boolean General Failure Flag true
apFlux_12_0_flag_apertureTruncated boolean Aperture did not fit within measurement image true
apFlux_12_0_flag_sincCoeffsTruncated boolean Full sinc coefficient image did not fit within measurement image true
apFlux_12_0_instFlux double Flux within 12.0-pixel radius aperture count true
apFlux_12_0_instFluxErr double 1-sigma flux uncertainty count true
apFlux_17_0_flag boolean General Failure Flag true
apFlux_17_0_instFlux double Flux within 17.0-pixel radius aperture count true
apFlux_17_0_instFluxErr double 1-sigma flux uncertainty count true
apFlux_35_0_flag boolean General Failure Flag true
apFlux_35_0_instFlux double Flux within 35.0-pixel radius aperture count true
apFlux_35_0_instFluxErr double 1-sigma flux uncertainty count true
apFlux_50_0_flag boolean General Failure Flag true
apFlux_50_0_instFlux double Flux within 50.0-pixel radius aperture count true
apFlux_50_0_instFluxErr double 1-sigma flux uncertainty count true
normCompTophatFlux_flag boolean General failure flag for normCompTophatFlux. true
normCompTophatFlux_instFlux double Normalized compensated tophat flux for calibration count true
normCompTophatFlux_instFluxErr double 1-sigma flux uncertainty on normCompTophatFlux_instFlux count true
extendedness_flag boolean Set to 1 for any fatal failure. true
sizeExtendedness_flag boolean Set to 1 for any fatal failure. true
footprintArea_value int Number of pixels in the sources detection footprint. pixel true
invalidPsfFlag boolean Source has an invalid psf. true
jacobian_flag boolean Set to 1 for any fatal failure true
jacobian_value double Jacobian correction true
localBackground_instFlux double Background in annulus around source count true
localBackground_instFluxErr double 1-sigma flux uncertainty count true
localBackground_flag boolean General Failure Flag true
localBackground_flag_noGoodPixels boolean No good pixels in the annulus true
localBackground_flag_noPsf boolean No PSF provided true
pixelFlags_bad boolean Bad pixel in the Source footprint true
pixelFlags_cr boolean Cosmic ray in the Source footprint true
pixelFlags_crCenter boolean Cosmic ray in the Source center true
pixelFlags_edge boolean Source is on the edge of an exposure region (masked EDGE) true
pixelFlags_interpolated boolean Interpolated pixel in the Source footprint true
pixelFlags_interpolatedCenter boolean Interpolated pixel in the Source center true
pixelFlags_nodata boolean Source is outside usable exposure region (masked NO_DATA) true
pixelFlags_offimage boolean Source center is off image true
pixelFlags_saturated boolean Saturated pixel in the Source footprint true
pixelFlags_saturatedCenter boolean Saturated pixel in the Source center true
pixelFlags_suspect boolean Sources footprint includes suspect pixels true
pixelFlags_suspectCenter boolean Sources center is close to suspect pixels true
psfFlux_apCorr double Aperture correction applied to base_PsfFlux true
psfFlux_apCorrErr double Standard deviation of aperture correction applied to base_PsfFlux true
psfFlux_area float Effective area of PSF pixel true
psfFlux_flag boolean Failure to derive linear least-squares fit of psf model forced on the calexp true
psfFlux_flag_apCorr boolean Set if unable to aperture correct base_PsfFlux true
psfFlux_flag_edge boolean Object was too close to the edge of the image to use the full PSF model true
psfFlux_flag_noGoodPixels boolean Not enough non-rejected pixels in data to attempt the fit true
gaussianFlux_flag boolean General Failure Flag true
centroid_flag boolean General Failure Flag true
centroid_flag_almostNoSecondDerivative boolean Almost vanishing second derivative true
centroid_flag_badError boolean Error on x and/or y position is NaN true
centroid_flag_edge boolean Object too close to edge true
centroid_flag_noSecondDerivative boolean Vanishing second derivative true
centroid_flag_notAtMaximum boolean Object is not at a maximum true
centroid_flag_resetToPeak boolean Set if CentroidChecker reset the centroid true
variance_flag boolean Set for any fatal failure true
variance_flag_emptyFootprint boolean Set to True when the footprint has no usable pixels true
variance_value double Variance at object position true
calib_astrometry_used boolean Set if source was used in astrometric calibration true
calib_photometry_reserved boolean Set if source was reserved from photometric calibration true
calib_photometry_used boolean Set if source was used in photometric calibration true
calib_psf_candidate boolean Flag set if the source was a candidate for PSF determination, as determined by the star selector. true
calib_psf_reserved boolean Set if source was reserved from PSF determination true
calib_psf_used boolean Flag set if the source was actually used for PSF determination, as determined by the true
deblend_deblendedAsPsf boolean Deblender thought this source looked like a PSF true
deblend_hasStrayFlux boolean This source was assigned some stray flux true
deblend_masked boolean Parent footprint was predominantly masked true
deblend_nChild int Number of children this object has (defaults to 0) true
deblend_parentTooBig boolean Parent footprint covered too many pixels true
deblend_patchedTemplate boolean This source was near an image edge and the deblender used patched edge-handling. true
deblend_rampedTemplate boolean This source was near an image edge and the deblender used ramp edge-handling. true
deblend_skipped boolean Deblender skipped this source true
deblend_tooManyPeaks boolean Source had too many peaks; only the brightest were included true
hsmPsfMoments_flag boolean General failure flag, set if anything went wrong true
hsmPsfMoments_flag_no_pixels boolean No pixels to measure true
hsmPsfMoments_flag_not_contained boolean Center not contained in footprint bounding box true
hsmPsfMoments_flag_parent_source boolean Parent source, ignored true
iDebiasedPSF_flag boolean General failure flag, set if anything went wrong true
iDebiasedPSF_flag_no_pixels boolean No pixels to measure true
iDebiasedPSF_flag_not_contained boolean Center not contained in footprint bounding box true
iDebiasedPSF_flag_parent_source boolean Parent source, ignored true
iDebiasedPSF_flag_galsim boolean GalSim failure true
iDebiasedPSF_flag_edge boolean Variance undefined outside image edge true
hsmShapeRegauss_flag boolean General failure flag, set if anything went wrong true
hsmShapeRegauss_flag_galsim boolean GalSim failure true
hsmShapeRegauss_flag_no_pixels boolean No pixels to measure true
hsmShapeRegauss_flag_not_contained boolean Center not contained in footprint bounding box true
hsmShapeRegauss_flag_parent_source boolean Parent source, ignored true
sky_source boolean Sky objects quasi-randomly placed with no detection footprints or bad pixels within an 8-pixel radius. Used for measurement of background and noise properties. true
visit foreign key long Id of the visit where this source was measured. false meta.id;obs.image
detector short Id of the detector where this source was measured. false meta.id;obs.image
band char Name of the band used to take the exposure where this source was measured. Abstract filter that is not associated with a particular instrument true meta.id;instr.bandpass 1
physical_filter char ID of physical filter, the filter associated with a particular instrument. true meta.id;instr.filter 9 9
sourceId primary key indexed long Unique id. Unique Source ID. Primary Key. false meta.id;src

Indexes

Index Definition Description
idx_Source_sourceId sourceId Unique index on sourceId column.

Constraints

Constraint Type Definition Description
fk_Source_Visit ForeignKey
Columns: visit
References: Visit.visit
 Link a Source to its associated Visit.