DiaSource

Properties of transient-object detections on the single-epoch difference images.

Columns

name datatype description unit nullable ivoa:ucd length
apFlux double Flux within 12.0-pixel aperture nJy true
apFluxErr double Flux uncertainty within 12.0-pixel aperture nJy true
apFlux_flag boolean General Failure Flag true
apFlux_flag_apertureTruncated boolean Aperture did not fit within measurement image true
bboxSize long Bounding box of diaSource footprint true
ccdVisitId foreign key long Unique ID of CCD and visit where this source was detected and measured. Primary Key of the CcdVisit Table. true meta.id;obs.image
centroid_flag boolean General failure flag, set if anything went wrong true
centroid_neg_flag boolean Failure flag for negative, set if anything went wrong true
centroid_pos_flag boolean Failure flag for positive, set if anything went wrong true
coord_dec double Fiducial ICRS Declination of centroid used for database indexing deg true pos.eq.dec;meta.main
coord_ra double Fiducial ICRS Right Ascension of centroid used for database indexing deg true pos.eq.ra;meta.main
decl double Position in Declination deg true pos.eq.dec
diaObjectId foreign key long Unique DiaObject ID. Primary Key of the DIA Object Table true meta.id.assoc;src
diaSourceId primary key long Unique ID true meta.id;src;meta.main
dipAngle double Dipole orientation deg true
dipChi2 double Chi2 per degree of freedom of dipole fit true
dipFluxDiff double Raw flux counts, positive lobe nJy true
dipFluxDiffErr double Raw flux uncertainty counts, positive lobe nJy true
dipLength double Pixel separation between positive and negative lobes of dipole pixel true
dipMeanFlux double Raw flux counts, positive lobe count true
dipMeanFluxErr double Raw flux uncertainty counts, positive lobe count true
filterName char Band used to take this observation true 1
forced_PsfFlux_flag boolean Forced PSF flux general failure flag. true
forced_PsfFlux_flag_edge boolean Forced PSF flux object was too close to the edge of the image to use the full PSF model. true
forced_PsfFlux_flag_noGoodPixels boolean Forced PSF flux not enough non-rejected pixels in data to attempt the fit. true
isDipole boolean Flag indicating diaSource is classified as a dipole true
ixx double Elliptical Gaussian adaptive moments arcsec**2 true
ixxPSF double Adaptive moments of the PSF model at the object position arcsec**2 true
ixy double Elliptical Gaussian adaptive moments arcsec**2 true
ixyPSF double Adaptive moments of the PSF model at the object position arcsec**2 true
iyy double Elliptical Gaussian adaptive moments arcsec**2 true
iyyPSF double Adaptive moments of the PSF model at the object position arcsec**2 true
midPointTai double Effective mid-exposure time for this diaSource. d true time.epoch;obs.exposure
parentDiaSourceId long Unique ID of parent source true
pixelFlags boolean General failure flag, set if anything went wrong 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 outside usable exposure region (masked EDGE or NO_DATA) true
pixelFlags_interpolated boolean Interpolated pixel in the Source footprint true
pixelFlags_interpolatedCenter boolean Interpolated pixel in the Source center 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 Source's footprint includes suspect pixels true
pixelFlags_suspectCenter boolean Source's center is close to suspect pixels true
pixelId long Position in ra/dec true
psFlux double Flux derived from linear least-squares fit of PSF model nJy true
psFluxErr double Flux uncertainty derived from linear least-squares fit of PSF model nJy true
psfFlux_flag boolean Failure to derive linear least-squares fit of psf model forced on the calexp 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
ra double Position in Right Ascension deg true pos.eq.ra
shape_flag boolean General Failure Flag true
shape_flag_maxIter boolean Too many iterations in adaptive moments true
shape_flag_psf boolean Failure in measuring PSF model shape true
shape_flag_shift boolean Centroid shifted by more than the maximum allowed amount true
shape_flag_unweighted boolean Weighted moments converged to an invalid value; using unweighted moments true
shape_flag_unweightedBad boolean Both weighted and unweighted moments were invalid true
snr double Ratio of apFlux/apFluxErr true
ssObjectId long Id of the solar system object (ssObject) this source was associated with, if any. If not, it is set to 0 true
totFlux double Forced PSF flux measured on the direct image. nJy true
totFluxErr double Forced PSF flux uncertainty measured on the direct image. nJy true
x double Unweighted first moment centroid, overall centroid pixel true
xErr float 1-sigma uncertainty on x position pixel true
y double Unweighted first moment centroid, overall centroid pixel true
yErr float 1-sigma uncertainty on y position pixel true

Constraints

Constraint Type Definition Description
DiaO_DiaS ForeignKey
Columns: diaObjectId
References: DiaObject.diaObjectId
 Link DiaObjects to associated DiaSources
CcdV_DiaS ForeignKey
Columns: ccdVisitId
References: CcdVisit.ccdVisitId
 Link CCD-level images to associated DiaSources