Page History
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Table 1: Key Guide Star Catalog releases and associated errors
Catalog | Release Date | Mean Epoch of catalog positions | Typical errors | Worst errors | Total Error (including SI to FGS alignment) | Comment |
|---|---|---|---|---|---|---|
GSC 2.4.0 | Oct 2017 | 2015.0 | 0.03” | ~0.2” | GSC2.3.4 aligned to Gaia DR1 | |
| GSC 2.3.3 | Oct 2009 | WFC3 installed May 2009 | ||||
GSC 2.3.2 | Oct 2005 | 1992.5 | 0.3” | 0.75” | ~0.3” | |
GSC 2.2.0 | Jun 2001 | Public Release | ||||
GSC 2.0 | Jan 2000 | Science target fields only |
GSC 1.1 | Aug 1992 | 1981.8 | 0.5” | ~1” | ~1” | First version published for the user community |
; Used by HST operations prior to Cycle 15 | ||||||
GSC 1.0 | Jun 1989 | 1-2” |
Absolute Astrometry Improvements in MAST
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