BRIGHT STAR ASTROMETRY WITH URAT
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| Format: | Artículo científico |
| Langue: | en |
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Universidad Nacional Autónoma de México
2015
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| _version_ | 1876487792516661248 |
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| author | N. Zacharias |
| author_facet | N. Zacharias |
| contents | BRIGHT STAR ASTROMETRY WITH URAT N. Zacharias Física, Astronomía y Matemáticas surveys catalogs Astrometry The U.S. Naval Observatory Robotic Astrometric Telescope (URAT) is obs erving the northern sky since April 2012 for an astrometric survey. Multiple overlaps per year are performed in a single bandpass (680 − 750 nm) using the “redlens” 20 cm aperture astrograph and a mosaic of large CCDs. Besides the regular, deep survey to magnitude 18.5, short exposures with an objective grating are ta ken to access stars as bright as 3rd magnitude. A brief overview of the program, observing and reductions is given. Posit ions on the 8 to 20 mas level are obtained of 66,202 Hipparcos stars at current epochs. These are compar ed to the Hipparcos Catalog to investigate its accuracy. About 20% of the observed Hipparcos stars are f ound to have inconsistent positions with the Hipparcos Catalog prediction on the 3 sigma level or over (about 75 m as or more discrepant position offsets). Some stars are now seen at an arcsec (or 25 sigma) off their Hipparco s Catalog predicted position. 2015 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57150514006 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.46 |
| format | Artículo científico |
| id | redalyc_57150514006 |
| institution | Redalyc |
| language | en |
| publishDate | 2015 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | BRIGHT STAR ASTROMETRY WITH URAT N. Zacharias Física, Astronomía y Matemáticas surveys catalogs Astrometry BRIGHT STAR ASTROMETRY WITH URAT N. Zacharias Física, Astronomía y Matemáticas surveys catalogs Astrometry The U.S. Naval Observatory Robotic Astrometric Telescope (URAT) is obs erving the northern sky since April 2012 for an astrometric survey. Multiple overlaps per year are performed in a single bandpass (680 − 750 nm) using the “redlens” 20 cm aperture astrograph and a mosaic of large CCDs. Besides the regular, deep survey to magnitude 18.5, short exposures with an objective grating are ta ken to access stars as bright as 3rd magnitude. A brief overview of the program, observing and reductions is given. Posit ions on the 8 to 20 mas level are obtained of 66,202 Hipparcos stars at current epochs. These are compar ed to the Hipparcos Catalog to investigate its accuracy. About 20% of the observed Hipparcos stars are f ound to have inconsistent positions with the Hipparcos Catalog prediction on the 3 sigma level or over (about 75 m as or more discrepant position offsets). Some stars are now seen at an arcsec (or 25 sigma) off their Hipparco s Catalog predicted position. 2015 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57150514006 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.46 |
| title | BRIGHT STAR ASTROMETRY WITH URAT |
| topic | Física, Astronomía y Matemáticas surveys catalogs Astrometry |
| url | https://www.redalyc.org/articulo.oa?id=57150514006 |