Information on resource 'ALeRCE ZTF Legacy Catalog'

Tables defined within this resource descriptor

• ztf.allwise – queryable through TAP and ADQL

  AllWISE catalog entries for ZTF cross-matched sources, including WISE mid-infrared photometry (W1-W4 bands) and 2MASS near-infrared photometry (J, H, K).

• ztf.dataquality – queryable through TAP and ADQL

  Image and PSF quality metrics for ZTF detections, including pixel statistics, PSF fit parameters, photometric calibration coefficients, and astrometric performance.

• ztf.detection – queryable through TAP and ADQL

  Individual detections for each ZTF object including photometric measurements, RealBogus quality scores, corrected magnitudes, and image quality flags.

• ztf.feature – queryable through TAP and ADQL

  Computed light-curve and variability features for ZTF objects used as input to ALeRCE classifiers. Features are stored per object, per filter, and per pipeline version.

• ztf.feature_version – queryable through TAP and ADQL

  Version metadata for feature computation runs, linking feature values in the feature table to the pipeline steps used for extraction and preprocessing.

• ztf.forced_photometry – queryable through TAP and ADQL

  Forced photometry measurements obtained at object positions for all ZTF epochs, including flux measurements, photometric calibration parameters, and image quality metrics.

• ztf.gaia_ztf – queryable through TAP and ADQL

  Gaia catalog cross-match properties for ZTF objects including distances and magnitudes of the nearest Gaia source and the nearest bright Gaia source.

• ztf.magstat – queryable through TAP and ADQL

  Per-filter magnitude statistics for each ZTF object including mean, median, min, max magnitudes both raw and corrected, along with temporal extent and variability metrics.

• ztf.non_detection – queryable through TAP and ADQL

  Upper limit measurements at object positions where no source was detected in ZTF images. Useful for constraining rise times and pre-discovery activity of transients.

• ztf.object – queryable through TAP and ADQL

  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.

• ztf.probability – queryable through TAP and ADQL

  Classification probabilities assigned to ZTF objects by various ALeRCE classifiers. Each row gives the probability of an object belonging to a given class according to a specific classifier and version.

• ztf.ps1_ztf – queryable through TAP and ADQL

  Pan-STARRS1 catalog cross-match properties for ZTF detections including griz photometry and star-galaxy scores for the three nearest PS1 sources.

• ztf.reference – queryable through TAP and ADQL

  Metadata for the ZTF reference images used in difference imaging, including the photometric properties of the nearest source in the reference image and the temporal extent of the reference image stack.

• ztf.score – queryable through TAP and ADQL

  Detector-based scores assigned to ZTF objects by pipeline modules such as real-bogus detectors or other quality-scoring components.

• ztf.score_distribution – queryable through TAP and ADQL

  Statistical reference distributions for detector scores, used to contextualize individual object scores against the overall population.

• ztf.ss_ztf – queryable through TAP and ADQL

  Cross-matches between ZTF objects and known solar system objects from the Minor Planet Center catalog.

• ztf.taxonomy – queryable through TAP and ADQL

  Taxonomy of ALeRCE classifiers and the set of class names they produce, used as a lookup to interpret probability and score tables.

• ztf.xmatch – queryable through TAP and ADQL

  Cross-matches between ZTF objects and external astronomical catalogs, including angular separation, catalog identifiers, and classification information.

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