Empirical Uncertainty Estimators for Astrometry from Digital Databases

Details Empirical Uncertainty Estimators for Astrometry from Digital Databases Empirical Uncertainty Estimators for Astrometry from Digital Databases

1999-06-10

arxiv.org/abs/astro-ph/9906177v2

Astron.J. 118 (1999) 1882

Astronomy and Astrophysics

Astrophysics

12 pages including 2 figures and 1 table. Accepted for publication in The Astronomical Journal, October 1999. Values in Table

Scientific paper

10.1086/301044

In order to understand the positional uncertainties of arbitrary objects in several of the current major databases containing astrometric information, a sample of extragalactic radio sources with precise positions in the International Celestial Reference Frame (ICRF) is compared with the available positions of their optical counterparts. The discrepancies between the radio and various optical positions are used to derive empirical uncertainty estimators for the USNO-A2.0, USNO-A1.0, Guide Star Selection System (GSSS) images, and the first and second Digitized Sky Surveys (DSS-I and DSS-II). In addition, an estimate of the uncertainty when the USNO-A2.0 catalog is transferred to different image data is provided. These optical astrometric frame uncertainties can in some cases be the dominant error term when cross-identifying sources at different wavelengths.

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