High-precision algorithms for astrometry - A comparison of two approaches

Details High-precision algorithms for astrometry - A comparison of two approaches High-precision algorithms for astrometry - A comparison of two approaches

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....115..361k&link_type=abstract

Astronomical Journal, vol. 115, p. 361

Astronomy and Astrophysics

Astronomy

2

Astrometry, Algorithms, Precision, Very Long Base Interferometry, Astronomical Catalogs, Solar Limb, Point Spread Functions

Scientific paper

This paper discusses the correspondence between two approaches to astrometric observational reductions: the approach based on angular observables used for optical observations, and the approach based on the interferometric delay observable used for VLBI observations. A procedure is presented by which VLBI algorithms can be used for optical observations. This scheme can help to guarantee consistent treatment of observational results in the two regimes. Differences between angle- and delay-based algorithms in current use are shown to be less than 1 micro-as. However, the physical models used as the bases for the algorithms must be improved to reach external accuracies at such levels.

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