Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-06-26
Astronomy Letters, 2010, Vol. 36, No. 7, pp.506-513
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
11 pages, 1 table, 5 figures
Scientific paper
10.1134/S1063773710070066
The absolute proper motions of about 275 million stars from the Kharkov XPM catalog have been obtained by comparing their positions in the 2MASS and USNO--A2.0 catalogs with an epoch difference of about 45 yr for northern-hemisphere stars and about 17 yr for southern-hemisphere stars. The zero point of the system of absolute proper motions has been determined using 1.45 million galaxies. The equatorial components of the residual rotation vector of the ICRS/UCAC2 coordinate system relative to the system of extragalactic sources have been determined by comparing the XPM and UCAC2 stellar proper motions: \omega_{x,y,z}=(-0.06,0.17,-0.84)+/-(0.15,0.14,0.14) mas yr^{-1}. These parameters have been calculated using about 1 million faintest UCAC2 stars with magnitudes R_{UCAC2}>16^m and J>14^m.7,for which the color and magnitude equation effects are negligible.
Akhmetov Vladimir S.
Bajkova Anisa T.
Bobylev Vadim V.
Fedorov Peter N.
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