ztf.dataqualityivo://x-unregistred/ztf/ztf_lowercase/dataqualityALeRCE (Automatic Learning for the Rapid Classification of Events)ALeRCE Teamhttps://tap.alerce.online/favicon.png2026-06-10T02:31:00ZALeRCE Team

Beauchef 851, Edificio Norte, piso 6. Santiago, Chile.

alerce.broker@gmail.comastronomy, objectsZTFtransientstime-series Image and PSF quality metrics for ZTF detections, including pixel statistics, PSF fit parameters, photometric calibration coefficients, and astrometric performance.http://tap.alerce.online/tableinfo/ztf.dataqualityztf Legacy ZTF astronomical catalog containing objects, detections, photometric measurements, classifications, and cross-matches from the Zwicky Transient Facility (ZTF) survey, as processed by the ALeRCE broker pipeline.ztf.dataquality Image and PSF quality metrics for ZTF detections, including pixel statistics, PSF fit parameters, photometric calibration coefficients, and astrometric performance.candidCandidate identifiermeta.idlongindexedprimaryoidObject identifiermeta.id;srccharindexedprimaryfidFilter identifiermeta.id;instr.filterintxposX pixel position of candidate on the imagepixpos.cartesian.xfloatnullableyposY pixel position of candidate on the imagepixpos.cartesian.yfloatnullablechipsfReduced chi-squared of PSF fit to the candidatestat.fit.chi2floatnullableskyLocal sky background estimateinstr.backgroundfloatnullablefwhmFull-width at half-maximum of the image PSFarcsecinstr.obsty.seeingfloatnullableclasstarSExtractor star-galaxy classifier score (0=galaxy, 1=star)src.class.starGalaxyfloatnullablemindtoedgeMinimum distance of candidate to image edgepixpos.angDistancefloatnullableseeratioRatio of PSF FWHM to the average seeing FWHM in the fieldstat.ratiofloatnullableaimageSemi-major axis of Gaussian fit to candidatearcsecsrc.morph.paramfloatnullablebimageSemi-minor axis of Gaussian fit to candidatearcsecsrc.morph.paramfloatnullableaimageratRatio of aimage to PSF semi-major axisstat.ratio;src.morph.paramfloatnullablebimageratRatio of bimage to PSF semi-minor axisstat.ratio;src.morph.paramfloatnullablennegNumber of negative pixels in a 5x5 pixel stamp around the candidatemeta.numberintnullablenbadNumber of bad pixels in a 5x5 pixel stamp around the candidatemeta.numberintnullablesumratRatio of sum of pixel values to sum of absolute pixel valuesstat.ratiofloatnullablescorrPeak S/N in the corrected score imagestat.snrfloatnullabledsnrmsRatio of differential to non-differential RMS noisestat.snrfloatnullablessnrmsRatio of science to non-differential RMS noisestat.snrfloatnullablemagzpsciPhotometric zero-point of science imagemagphot.calibfloatnullablemagzpsciuncUncertainty in photometric zero-pointmagstat.error;phot.calibfloatnullablemagzpscirmsRMS scatter of zero-point calibration fitmagstat.rms;phot.calibfloatnullablenmatchesNumber of catalog stars used for photometric calibrationmeta.numberintnullableclrcoeffColor coefficient for photometric calibrationphot.color;arith.ratiofloatnullableclrcouncUncertainty in color coefficientstat.error;phot.color;arith.ratiofloatnullablezpclrcovCovariance between zero-point and color coefficientstat.covariance;phot.calibfloatnullablezpmedMedian zero-point magnitude across the fieldmagphot.calib;stat.medianfloatnullableclrmedMedian color coefficient across the fieldphot.color;stat.medianfloatnullableclrrmsRMS scatter of color coefficient fitstat.rms;phot.colorfloatnullableexptimeExposure timestime.duration;obs.exposurefloatnullable