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Description :
The Guide Star Catalog II (GSC-II) is an all-sky optical catalog based on 1" resolution scans of the photographic Sky Survey plates, at two epochs and three bandpasses, from the Palomar and UK Schmidt telescopes. This all-sky catalog will ultimately contains positions, proper motions, classifications, and magnitudes in multiple bandpasses for almost a billion objects down to approximately Jpg=21, Fpg=20. The GSC-II is currently used for HST Bright Object Protection and HST pointing. Looking ahead, the GSC-II will form the basis of the Guide Star Catalog for JWST. This was constructed in collaboration with ground-based observatories for use with the GEMINI, VLT and GALILEO telescopes
Note - always use the most recent version of GSC 2 (currently 2.3.4) for HST target coordinates!
Versions :
Version |
Date |
Sky
Coverage |
Mag limit | Bands | Ast | Phot | PM | Delivered |
|
| 2.0 | January 2000 | Science target fields | none | J,F | TYC1 | GSPC1 | no | Ops | |
| 2.1.0 | April 2000 | 30% | none | J,F | TYC1 | GSCP1 | no | consortium | |
| 2.1.1 | July 2000 | 50% | none | J,F | TYC2 | GSPC2.1 | no | consortium | |
| 2.2.0 | June 2001 | 98% | F=18.5 | J,F | TYC2 | GSPC2.2 | no | Public | release notes |
| 2.2.1 | August 2001 | 98% | none | J,F | TYC2 | GSPC2.2 | no | Ops | |
| 2.3.0 | September 2003 | 100% | none | J,F,N | TYC2 | GSPC2.3 | no | consortium | |
| 2.3.1 | October 2004 | 100% | none | J,F,N,+ | TYC2 | GSPC2.3 | yes | consortium | |
| 2.3.2 | October 2005 | 100% | none | J,F,N,+ | TYC2 | GSPC2.3 | yes/no* | Ops / Public | release notes |
| 2.3.3 | October 2009 | 100% | none | J,F,N,+ | TYC2 | GSPC2.3 | yes/no* | Ops / Public | release notes |
+ the additional passbands are primarily from the POSSI-E, the POSSI-O and Palomar Quick-V surveys so only cover the northern heimpshere
* the computed proper motions are not yet publically available because we discovered a 10mas/year systematic error for the southern hemisphere that we are still investigating.
References :
The Second Generation Guide Star Catalog : Description and Properties
Lasker et al 2008 AJ 136,735
Properties :
Summary of catalog properties and coded values
Data
Access :
GSC
2.0 : not available
GSC 2.1 : not available
GSC 2.2 : superseded by v2.3
GSC 2.3 : on-line | download not supported (200GB)
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