ztf.objectivo://x-unregistred/ztf/ztf_lowercase/objectALeRCE (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 Main catalog of astronomical objects observed by ZTF. Each record corresponds to a unique transient or variable source with aggregated position, detection counts, photometric color statistics, and temporal coverage.http://tap.alerce.online/tableinfo/ztf.objectztf 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.object Main catalog of astronomical objects observed by ZTF. Each record corresponds to a unique transient or variable source with aggregated position, detection counts, photometric color statistics, and temporal coverage.oidUnique object identifiermeta.id;srccharindexedprimaryndethistNumber of spatially-coincident detections going back to beginning of survey; only detections on the same field and readout-channel ID counted, down to S/N~3meta.number;obsintnullablencovhistNumber of times the object position fell on any field and readout-channel going back to beginning of surveymeta.number;obsintnullablemjdstarthistEarliest Modified Julian Date corresponding to ndethistdtime.startdoublenullablemjdendhistLatest Modified Julian Date corresponding to ndethistdtime.enddoublenullablecorrectedWhether the corrected light curve was computed and can be usedmeta.code.qualbooleanstellarWhether the object is classified as stellar-like (unresolved source) based on PS1 and ZTF reference image propertiessrc.class.starGalaxybooleannullablendetTotal number of detectionsmeta.number;srcintindexedg_r_maxMaximum g-r color (difference between minimum g and r band magnitudes)phot.color;stat.maxfloatindexednullableg_r_max_corrMaximum g-r color using corrected magnitudesphot.color;stat.maxfloatnullableg_r_meanMean g-r color (difference between mean g and r band magnitudes)phot.color;stat.meanfloatnullableg_r_mean_corrMean g-r color using corrected magnitudesphot.color;stat.meanfloatindexednullablemeanraMean right ascension (ICRS)degpos.eq.ra;meta.maindoubleindexedmeandecMean declination (ICRS)degpos.eq.dec;meta.maindoubleindexedsigmaraStandard deviation of right ascensiondegstat.error;pos.eq.radoublenullablesigmadecStandard deviation of declinationdegstat.error;pos.eq.decdoublenullabledeltajdTime span between first and last observation in Julian daysdtime.intervaldoublefirstmjdModified Julian Date of first detectiondtime.start;obsdoubleindexedlastmjdModified Julian Date of last detectiondtime.end;obsdoublestep_id_corrStep identifier for the photometric correction pipeline versionmeta.idcharnullablediffposDifference image positivity flagmeta.code.qualbooleannullablereference_changeFlag indicating a reference image change occurred during the object historymeta.code.qualbooleannullable