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Close Approach Astrometry: A Method for Improving Reference Systems

Published online by Cambridge University Press:  12 April 2016

T. Nakamura  and
H. Shibasaki
T. Nakamura
Affiliation:
National Astronomical Observatory Osawa, Mitaka, Tokyo 181JAPAN
H. Shibasaki
Affiliation:
National Astronomical Observatory Osawa, Mitaka, Tokyo 181JAPAN

Abstract

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For improved establishment of the dynamical reference frame and tying it to the stellar reference frame, a method to observe close approach (CA) events between satellite and satellite and/or satellite and star is proposed here. The accuracy of measurements of angular distance is 0”.02 – 0”.03 for a single data point. We apply this technique fairly successfully to the CA events of the Galilean satellites and a preliminary orbital longitude correction to the E2X3 constants of J4 is obtained from eight CA observations ranging from 1987 to 1989.

Type
Part 2. Poster Papers
Information
International Astronomical Union Colloquium , Volume 127: Reference Systems , 1991 , pp. 319 - 322
Copyright
Copyright © United States Naval Observatory 1991

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