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Comparison of the FK5 Proper-Motion System with a Kinematic Distribution Function

Published online by Cambridge University Press:  12 April 2016

Kavan U. Ratnatunga  and
Wayne H. Warren Jr.
Kavan U. Ratnatunga
Affiliation:
National Research Council Space Data and Computing Division
Wayne H. Warren Jr.
Affiliation:
ST Systems Corporation Astronomical Data Center National Space Science Data Center NASA Goddard Space Flight Center Greenbelt, Maryland 20771U. S. A.

Abstract

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A model for the kinematic distribution function of our Galaxy can be used as an independent confirmation that a reference system is free of Earth motions and retains the true kinematics of the stars. Maximum likelihood can simultaneously estimate the parameters required to calibrate distances to the stars, represent the kinematic distribution function, and check on residual Earth rotations in the proper-motion system. The global maximum-likelihood analysis uses all available information: photometry, trigonometric parallax, proper motion, and line-of-sight velocity for a well-defined catalog of stars. Awaiting observations from HIPPARCOS, preliminary testing of the algorithm on available ground-based observations is discussed.

Type
Part 2. Poster Papers
Information
International Astronomical Union Colloquium , Volume 127: Reference Systems , 1991 , pp. 335 - 338
Copyright
Copyright © United States Naval Observatory 1991

References

Casertano, S., Ratnatunga, K.U., & Bahcall, J.N. 1990, ApJ, 357, 435.CrossRefGoogle Scholar
Eichhorn, H. 1974, Astronomy of Star Positions (New York, Frederick Ungar), p. 92.Google Scholar
Ratnatunga, K.U., Bahcall, J.N., & Casertano, S. 1989, ApJ, 339, 106.Google Scholar
Ratnatunga, K.U., & Casertano, S. 1991, AJ, in press.Google Scholar
Ratnatunga, K.U., & Upgren, A.R. 1991, in preparation.Google Scholar
Williams, J.G., Dickey, J.O., Newhall, X X, & Standish, E.M. 1990, A&A, in press.Google Scholar