Construction and verification of the Tycho-2 Catalogue

Details Construction and verification of the Tycho-2 Catalogue Construction and verification of the Tycho-2 Catalogue

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...357..367h&link_type=abstract

Astronomy and Astrophysics, v.357, p.367-386 (2000)

Astronomy and Astrophysics

Astrophysics

124

Astrometry, Techniques: Photometric, Catalogs, Methods: Data Analysis

Scientific paper

The construction of the Tycho-2 Catalogue is described. The catalogue contains astrometric positions and proper motions as well as two-colour photometric data for 2.5 million stars. The Tycho-2 positions and magnitudes are based on precisely the same observations as the original Tycho Catalogue (hereafter Tycho-1) collected by the sky mapper of the ESA Hipparcos satellite, but Tycho-2 is much bigger and slightly more precise, owing to a more advanced reduction technique. Components of double stars with separations down to 0.8 arcsec are included. Proper motions precise to about 2.5 mas/yr are given as derived from a comparison with the Astrographic Catalogue and 143\ other astrometric catalogues, all reduced to the Hipparcos celestial coordinate system. Tycho-2 supersedes in most applications Tycho-1, and the ACT and TRC catalogues based on Tycho-1. Based on observations made with the ESA Hipparcos astrometry satellite.

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