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Accuracy Assessment of Hipparcos Optical and VLA Radio Positions of Stars

Published online by Cambridge University Press:  07 August 2017

H. G. Walter ,
R. Hering ,
H. Lenhardt ,
Chr. deVegt ,
D.R. Florkowski  and
K. J. Johnston
H. G. Walter
Affiliation:
Astronomisches Rechen-Institut, Mönchhofstr. 12-14, D-6900 Heidelberg, Germany
R. Hering
Affiliation:
Astronomisches Rechen-Institut, Mönchhofstr. 12-14, D-6900 Heidelberg, Germany
H. Lenhardt
Affiliation:
Astronomisches Rechen-Institut, Mönchhofstr. 12-14, D-6900 Heidelberg, Germany
Chr. deVegt
Affiliation:
Hamburger Sternwarte, Gojenbergsweg 112, D-2050 Hamburg 80, Germany
D.R. Florkowski
Affiliation:
U.S. Naval Observatory, Washington, D.C. 20390, USA
K. J. Johnston
Affiliation:
Naval Research Laboratory, Washington, D.C. 20375, USA

Abstract

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Optical positions of some 30 radio stars derived from 12 months of HIPPARCOS measurements are compared with their radio positions obtained with the Very Large Array (VLA). — Once the lengths of arcs between optical and radio positions of pairs of stars are calculated the differences of the arcs are formed. They provide an estimate of the coincidence of the optical and radio emission centres. — From the comparison of optical and radio positions infinitesimal rotation angles of the HIPPARCOS frame with respect to the VLA extragalactic reference frame are determined by rigid rotations. After taking account of the relative orientation of the frames the standard deviations of the remaining residuals are approximately of the order of the VLA observation errors, thus demonstrating the reliability of the HIPPARCOS results. However, they also indicate some data noise very likely caused by the low accuracy of optical proper motions used to bridge the HIPPARCOS-radio epoch differences up to 9 years, and possible discrepancies of radio-optical emission centres of some stars.

Type
Celestial Reference Frame
Information
Symposium - International Astronomical Union , Volume 156: Developments in Astrometry and their Impacts on Astrophysics , 1993 , pp. 377 - 380
Copyright
Copyright © Kluwer 

References

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