Extending the ICRF into the infrared: 2MASS-UCAC astrometry

Details Extending the ICRF into the infrared: 2MASS-UCAC astrometry Extending the ICRF into the infrared: 2MASS-UCAC astrometry

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..603z&link_type=abstract

In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J

Astronomy and Astrophysics

Astronomy

1

International Celestial Reference System

Scientific paper

An external comparison between the infrared 2MASS and optical UCAC positions was performed, both being on the same system, the ICRS. About 48 million sources in common were identified. Random errors of the 2MASS catalog positions are about 60 to 70 mas per coordinate for the Ks = 4 to 14 range, increasing to about 100 to 150 mas for saturated and very faint stars. Systematic position differences between the 2 catalogs are very small, about 5 to 10 mas as a function of magnitude and color, with somewhat larger errors as a function of right ascension and declination. The extension into the infrared has become a reality.

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