||Version 1 of the Hubble Source Catalog
||512, Astronomical Data Analysis Software and Systems XXV
||Whitmore, B.; Budavari, T.; Donaldson, T.; Downes, R. A.; Lubow, S. H.; Quick, L.; Strolger, L.-G.; Wallace, G.; White, R. L.
||The Hubble Source Catalog (HSC) is designed to help optimize science
from the Hubble Space Telescope by combining the tens of thousands of
visit-based Hubble Legacy Archive (HLA - available at
http://hla.stsci.edu) source lists into a single master catalog. The
HSC includes ACS/WFC, WFPC2, and WFC3 source lists generated using the
Source Extractor software (Bertin & Arnouts 1996).
The current version
of the catalog includes roughly 80 million detections of 30 million
objects involving 112 different detector/filter combinations and about
50 thousand HST exposures cross-matched using techniques described in Budavári & Lubow (2012).
To carry out the cross matching we first
improve the astrometry for the source lists using a histogram method
to compare against Pan-STARRS, SDSS, and 2MASS catalogs. We then
further improve the alignment using a highly efficient method for
approximately aligned source lists to achieve relative offsets
typically good to a few milli-arcsec (mas). A final pass versus Pan-STARRS
is use to normalize to their absolute astrometry grid. The relative astrometric
residuals for HSC objects are typically within 10 mas while the absolute astrometry is
good to about 100 mas. The photometric
magnitude residuals between repeat measurements are generally within
0.10 mag, and only a few hundredths of a mag for high signal-to-noise observations. The primary ways to access the HSC are the MAST Discovery
Portal (http://mast.stsci.edu), and a CasJobs capability for advanced
searches. The URL for the HSC is http://archive.stsci.edu/hst/hsc/.