The Hubble Source Catalog (HSC) is designed to optimize science from the Hubble Space Telescope by \ncombining the tens of thousands of visit-based source lists in the Hubble Legacy Archive (HLA) \ninto a single master catalog.\nThe Hubble Source Catalog (HSC) detailed search \ndisplays an entry for each separate detection (or nondetection if nothing is found at that position) \nusing all the relevant Hubble observations for a given object \n(i.e., different filters, detectors, separate visits).\nThe catalog currently contains over 100 million entries.