• No labels

2 Comments

    • GSC 1.1 was the original HST operational catalog from launch till around 2000 constructed from a single epoch of digitized Palomar and AAO photographic surveys
    • GSC 2.3.4 was the HST operational catalog in use since 2000 (last update 2009) constructed from at least two epochs of digitized Palomar and AAO photographic surveys.
    • GSC 2.4.0 contains the same GSC 2.3.4 objects but with updated astrometry from GAIA and became the default operational catalog at the start of October 2017.
      • GAIA dr1 (positions, proper motions, parallax)
    • GSC 2.4.1 is the first release of the augmented GSC by adding object parameters (and new objects) from deeper surveys.
      • GSC 2.4.0
      • UCAC5 (proper motions for GAIA sources - no new objects)
      • APASS dr9 (optical photometry - no new objects added)
      • 2MASS+6x (IR photometry, classifications + positions of new objects)
      • SDSS dr13 (optical photometry, classifications + positions of new objects)
      • VISTA - VHS dr4 (IR photometry, classifications + positions of new objects)
      • VISTA - VIKING dr2 (IR photometry, classifications + positions of new objects)
      • VST - ATLAS dr3 (optical photometry, classifications + positions of new objects)
      • VST - KIDS dr3 (optical photometry, classifications + positions of new objects)
    • GSC 2.4.1.2 Added the following catalogs
      • PanSTARRS dr1/2
      • SMSS dr1
      • WISE
      • GALEX
      • ultraVISTA
    • GSC 2.4.2 has the astrometric information updated to GAIAdr2 and became the default operational catalog mid-December 2020.
  1. As GAIA data release (DRx) become available, these astrometric data will be added back into the GSC and released as GSC 2.4.x along with additional surveys that may have been included in the interim