Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..16e..36b&link_type=abstract
Nomenclature, Precession and New Models in Fundamental Astronomy, 26th meeting of the IAU, Joint Discussion 16, 22-23 August 200
Astronomy and Astrophysics
Astronomy
Scientific paper
The kinematics of the Tycho-2 and UCAC2 stars have been tested using a linear Ogorodnikov-Milne model. The distant Tycho-2/UCAC2 stars (d≈900 pc) have been found to rotate around the Galactic y-axis with an angular velocity of M[y]= -0.37±0.04 mas yr^-1. This value can be explained as a residual rotation of the ICRS/Tycho-2 system relatively to the extragalactic inertial frame. It is shown that the UCAC2 star proper motions have a magnitude equation in μ[α]cosδ in the range of star magnitudes 12-15^m. For stars of the north hemisphere the coefficient of the magnitude equation have been found to be -0.60±0.05 mas yr^ -1 mag^-1. In the proper motions of the UCAC2 stars, which are fainter than ≈11 ^m,^ a magnitude equation has not been found.
Bobylev Vadim V.
Khovrichev Yu. M.
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