Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007acasn..48..463j&link_type=abstract
Acta Astronomica Sinica, vol. 48, no. 4, p. 463-474
Astronomy and Astrophysics
Astronomy
Astronomicel Data Bases: Catalogs
Scientific paper
Compared with traditional photographic astrometry, CCD astrometry has the outstanding advantages of higher accuracy, efficient work and wider magnitude range. But it is endowed with some special errors, such as the systematic error related to magnitude due to the electric charge transfer efficiency. Magnitude equation is one of difficult problems in analyzing systematic error of catalog. The technique of CCD drift scanning has got extensive application in space and ground based telescopes. The observation of CCD drift scanning , may cause the systematic errors associated with continuously moving of the tangent point on the celestial sphere. There has not been almost, however, error analysis on the catalogs observed with CCD drift scanning. In the article, the systematic errors of two astrometric catalogs , ACR(Astrometric calibration regions along the celestial equator)and CMC13(Carlsberg Meridian Telescope Catalog 13), which were observed with CCD drift scanning, are analyzed by comparing them with UCAC2 (The second US Naval Observatory CCD Astrograph Catalog). It is found that there are significant magnitude equations, from -10 mas to +50mas, in declination of ACR and CMC13. Waves with period approximated to the FOV of the drift scanning CCD exist in the systematic differences of positions in both UCAC2-ACR and UCAC2-CMC13. The possible sources of the errors are discussed. On the basis, the research topics about the errors in the high accuracy astrometric observation by the 1.2 m Schmidt telescope at Purple Mountain Observatory with CCD drift scanning are put forward.
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