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Reference Frame Studies at JPL/Caltech

Published online by Cambridge University Press:  30 March 2016

J. O. Dickey ,
P. B. Esposito ,
J.-F. Lestrade ,
R. P. Linfield ,
W. G. Melbourne ,
X X Newhall ,
A. E. Niell ,
R. A. Preston ,
E. M. Standish  and
J. G. Williams
...Show all authors
J. O. Dickey
Affiliation:
Jet Propulsion Laboratory California Institute of Technology, Pasadena, CA, U.S.A.
P. B. Esposito
Affiliation:
Jet Propulsion Laboratory California Institute of Technology, Pasadena, CA, U.S.A.
J.-F. Lestrade
Affiliation:
Jet Propulsion Laboratory California Institute of Technology, Pasadena, CA, U.S.A.
R. P. Linfield
Affiliation:
Jet Propulsion Laboratory California Institute of Technology, Pasadena, CA, U.S.A.
W. G. Melbourne
Affiliation:
Jet Propulsion Laboratory California Institute of Technology, Pasadena, CA, U.S.A.
X X Newhall
Affiliation:
Jet Propulsion Laboratory California Institute of Technology, Pasadena, CA, U.S.A.
A. E. Niell
Affiliation:
Jet Propulsion Laboratory California Institute of Technology, Pasadena, CA, U.S.A.
R. A. Preston
Affiliation:
Jet Propulsion Laboratory California Institute of Technology, Pasadena, CA, U.S.A.
E. M. Standish
Affiliation:
Jet Propulsion Laboratory California Institute of Technology, Pasadena, CA, U.S.A.
J. G. Williams
Affiliation:
Jet Propulsion Laboratory California Institute of Technology, Pasadena, CA, U.S.A.
D. O. Muhleman
Affiliation:
California Institute of Technology, Pasadena, CA, U.S.A.
G. L. Berge
Affiliation:
California Institute of Technology, Pasadena, CA, U.S.A.
D. J. Rudy
Affiliation:
California Institute of Technology, Pasadena, CA, U.S.A.

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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.

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 7: Highlights of Astronomy. As presented at the XIXth General Assembly of the IAU, 1985 , 1986 , pp. 93 - 96
Copyright
Copyright © Reidel 1986

References

References:

Backer, D. C., Fomalont, E. B., Goss, W. M., Taylor, J. H. and Weisberg, J. M., Accurate Timing and Interferometric Positions for the Millisecond Pulsar 1937+21 and the Binary Pulsar 1913+16, A. J. 90, 2275, 1985.CrossRefGoogle Scholar
Fanselow, J. L., Sovers, O. J., Thomas, J. B., Purcell, G. H., Cohen, E. J., Rogstad, D.H., Skjerve, L. J., and Spitzmesser, D. J., Radio Interferometric Determination of Source Positions Utilizing Deep Space Network Antennas, 1971 to 1980, A. J., 89, 987–998, 1984.CrossRefGoogle Scholar
Jefferys, W. H., Astrometry with the Space Telescope, Celestial Mech. 22, 175–181, 1980.CrossRefGoogle Scholar
Kovalevsky, J., Global Astrometry by Space Techniques, Celestial Mech. 22, 153–163, 1980.CrossRefGoogle Scholar
Lestrade, J-F, Preston, R. A., Requieme, Y., Rapaport, M., and Mutel, R. L., Milliarcsecond Structures, VLBI and Optical Positions of 8 Hipparcos Radio Stars, Proceedings of a Colloquium on the European Astrometry Satellite Hipparcos-Scientific Aspects of the Input Catalogue Preparation – Aussois, 3–7 June 1985 (ESA SP-234), 251–253, 1985.Google Scholar
Muhleman, D. O., Berge, G. L., Rudy, D. J., Niell, A. E., Linfield, R. P., and Standish, E. M., Precise Position Measurements of Jupiter, Saturn and Uranus Systems with the Very Large Array, Celestial Mechanics, in press, 1986.CrossRefGoogle Scholar
Newhall, X X, Preston, R. A., and Esposito, P. B., Relating the JPL VLBI Reference Frame and the Planetary Ephemerides, Proceedings of the International Astronomical Union Symposium 109: Astrometric Techniques, Gainesville, Florida, 1984.CrossRefGoogle Scholar
Niell, A. E., Fanselow, J. L., Sowers, O. J., Thomas, J. B., Liewer, K. M., Treuhaft, R. N., and Wallace, K. S., Accurate Positions of 120 Radio Sources with Declinations Above -45 Degrees., Proceedings IAU Symposium No. 109: Astrometric Techniques, Gainesville, Florida, 1984.CrossRefGoogle Scholar
Standish, E. M., Planetary and Lunar Ephemerides, DE125/LE125, JPL 10M 314.–591, 1985.Google Scholar
Standish, E. M., Orientation of the JPL Ephemerides, DE200/LE200, to the Dynamical Equinox of J2000, Astron. Astrophys., 114, 297–302, 1982.Google Scholar
Williams, J. G., Dickey, J. O., Melbourne, W. G., and Standish, E. M., Unification of Celestial and Terrestrial Coordinate Systems, Proceedings of the International Association of Geodesy (IAG) Symposia, International Union of Geodesy and Geophysics (IUGG) XVIIIth General Assembly, Hamburg, FRG, August 15–27, 1983, Ohio State University, Dept. of Geodetic Science and Surveying, Columbus, Ohio 43210, Vol. 2, 12–27, 1984.Google Scholar