| 词条 | Hubble Guide Star Catalog – Astrographic Catalog/Tycho |
| 释义 |
The Hubble Guide Star Catalog – Astrographic Catalog/Tycho (GSC-ACT) is an astronomical catalog. It contains the twenty million stars of the Hubble GSC, version 1.1, recalibrated using the U.S. Naval Observatory's ACT (Astrographic Catalog/Tycho). By 2009 it was considered obsolete, superseded by such catalogues as GSC-2.2, B1.0, A2.0, and especially UCAC-3.[1] GSC-ACT was a re-calibration of the Guide Star Catalog version 1.1 for Hubble.[2] The original GSC dated to 1989,[3] and one of the reasons for an update was improvements to star catalogs that took place after that time.[4] In this case the ACT catalog was used, which had for example more stars and whereas the GSC 1.1 had 3rd order fit for plate distortions, the ACT has a five-order available.[5] Another improvement of the GSC 1.1 was the GSC 1.2.[6] GSC-ACT uses five classification codes:[7]
See also
References1. ^{{Cite web|url=https://www.projectpluto.com/gsc_act.htm|title=GSC-ACT files and information|last=Gray|first=Bill|website=www.projectpluto.com|access-date=2017-03-03}} 2. ^{{Cite web|url=http://vizier.u-strasbg.fr/cgi-bin/VizieR?-source=GSC-ACT|title=VizieR|website=vizier.u-strasbg.fr|access-date=2017-03-03}} 3. ^{{Cite web|url=https://www.projectpluto.com/gsc_act.htm|title=GSC-ACT files and information|last=Gray|first=Bill|website=www.projectpluto.com|access-date=2017-03-03}} 4. ^{{Cite web|url=http://tdc-www.harvard.edu/catalogs/gsc_act_all.htm|title=GSC-ACT files and information|last=Gray|first=Bill|website=tdc-www.harvard.edu|access-date=2017-03-03}} 5. ^{{Cite web|url=http://tdc-www.harvard.edu/catalogs/gsc_act_all.htm|title=GSC-ACT files and information|last=Gray|first=Bill|website=tdc-www.harvard.edu|access-date=2017-03-03}} 6. ^{{Cite web|url=http://tdc-www.harvard.edu/catalogs/gsc_act_all.htm|title=GSC-ACT files and information|last=Gray|first=Bill|website=tdc-www.harvard.edu|access-date=2017-03-03}} 7. ^{{Cite web|url=http://ledas-www.star.le.ac.uk/blasta/gscahelp.php|title=GSC-ACT Catalog|website=ledas-www.star.le.ac.uk|access-date=2017-03-03}} External links
1 : Astronomical catalogues of stars |
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