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Reference Frame Studies at JPL/Caltech

Dickey, J. O. and Esposito, P. B. and Lestrade, J.-F. and Linfield, R. P. and Melbourne, W. G. and Newhall, X. X. and Niell, A. E. and Preston, R. A. and Standish, E. M. and Williams, J. G. and Muhleman, D. O. and Berge, G. L. and Rudy, D. J. (1986) Reference Frame Studies at JPL/Caltech. In: XIXth General Assembly of the IAU. Highlights of Astronomy. No.7. D. Reidel , Dordrecht, pp. 93-96. ISBN 9789027722782.

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In recent years, a revolution in astronomical position measurements has been taking place with the advent of modern space techniques. These new techniques, which supplement the traditional astrometric measurements, include laser ranging to the moon and artificial satellites, very-long-baseline interferometry (VLBI) of galactic and extra-galactic radio sources and spacecraft, radio tracking of satellites, and radar-ranging and spacecraft tracking during planetary encounters. Impressive accuracies have been achieved and further improvements are forthcoming. Each technique can be expected to establish its own reference frame which is derived from observations of a particular class of objects. The celestial and terrestrial coordinate systems are related through adopted constants and definitions. Contemporary astronomy has led to the development of three principal celestial coordinate systems: the optical frame (FK4/FK5) based on positions of galactic stars; the planetary/lunar ephemeris frame based on the major celestial bodies of the solar system; and the radio frame constructed from observations of extragalactic radio sources (quasars). Each frame is rotated with respect to others; furthermore, the optical frame offset is time variable. It is important that all frames be interconnected and unified. The optical frame is being connected to the radio frame by VLBI observations of radio emitting stars. The radio frame is being tied to the ephemeris frame in several ways – one is via differential VLBI measurements between quasars and planet-orbiting spacecraft.

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Additional Information:© 1986 by the IAU. This paper presents the results of one phase of research carried out at the Jet Propulsion Laboratory, California Institute of Technology sponsored by the National Aeronautics and Space Administration.
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Series Name:Highlights of Astronomy
Issue or Number:7
Record Number:CaltechAUTHORS:20181211-080024412
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Official Citation:Dickey, J., Esposito, P., Lestrade, J., Linfield, R., Melbourne, W., Newhall, X., . . . Rudy, D. (1986). Reference Frame Studies at JPL/Caltech. Highlights of Astronomy, 7, 93-96. doi:10.1017/S1539299600006274
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91666
Deposited By: Tony Diaz
Deposited On:11 Dec 2018 18:23
Last Modified:16 Nov 2021 03:43

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