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Dynamical Reference Frames in the Planetary and Earth-Moon Systems

Published online by Cambridge University Press:  19 July 2016

E. M. Standish  and
J. G. Williams
E. M. Standish
Affiliation:
Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive Pasadena, CA 91109 USA
J. G. Williams
Affiliation:
Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive Pasadena, CA 91109 USA

Abstract

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We summarize our previous estimates of the accuracies of the ephemerides. Such accuracies determine how well one can establish the dynamical reference frame of the ephemerides. Ranging observations are the dominant data for the inner four planets and the Moon: radar-ranging for Mercury and Venus; Mariner 9 and Viking spacecraft-ranging for the Earth and Mars; lunar laser-ranging for the Moon. Optical data are significant for only the five outermost planets. Inertial mean motions for the Earth and Mars are determined to the level of 0.″003/cty during the time of the Viking mission; for Mars, this will deteriorate to 0.″01/cty or more after a decade or so; similarly, the inclination of the martian orbit upon the ecliptic was determined by Viking to the level of 0.″001. Corresponding uncertainties for Mercury and Venus are nearly two orders of magnitude larger. For the lunar mean motion with respect to inertial space, the present uncertainty is about 0.″04/cty; at times away from the present, the uncertainty of 1′/cty2 in the acceleration of longitude dominates. The mutual orientations of the equator, ecliptic and lunar orbit are known to 0.″002. The inner four planets and the Moon can now be aligned with respect to the dynamical equinox at a level of about 0.″005.

Type
Part 3: Concepts, Definitions, Models
Information
Symposium - International Astronomical Union , Volume 141: Inertial Coordinate System on the Sky , 1990 , pp. 173 - 182
Copyright
Copyright © Kluwer 1990 

References

Fricke, W. : 1971, “A Rediscussion of Newcomb's Determination of Precession”, Astron. Astrophys. 13, 298–308.Google Scholar
Fricke, W. : 1982, “Determination of the Equinox and Equator of the FK5”, Astron. Astrophys. 107, L13–L16.Google Scholar
Morrison, L.V., Helmer, L., Fabricius, C., Einicke, O., Quijano, L., Muinos, J.L., Argyle, R.W. : 1990, “Optical Reference Frame Defined by Carlsberg Meridian Catalogues for the Years 1984-1987”, these proceedings.CrossRefGoogle Scholar
Seidelmann, P.K. : 1986, “Unsolved Problems of Celestial Mechanics — The Solar System”, Cel., Mech. , 39, 141–146.Google Scholar
Seidelmann, P.K., Santoro, E.J. and Pulkkinen, K.F. : 1985, Systematic Differences between Planetary Observations and Ephemerides”, in Dynamical Astronomy , Szebehely, V. and Balazs, B., Eds., University of Texas Press, Austin, 55–65.Google Scholar
Standish, E.M. : 1982, “The JPL Planetary Ephemerides”, Cel., Mech. 26, 181–186.Google Scholar
Standish, E.M. : 1985, “On the Orientation of Ephemeris Reference Frames”, Cel., Mech. 37, 239–242.CrossRefGoogle Scholar
Standish, E.M. : 1988, “Celestial Reference Frames: Definitions and Accuracies”, in The Impact of VLBI on Astrophysics and Geophysics (Reid, M. J. and Moran, J. M., Eds.), D. Reidel, publ., 309–315.Google Scholar
Standish, E.M. : 1989, “An approximation to the outer planet ephemeris errors in JPL's DE200”, Astron. Astrophys , in press.Google Scholar
Stumpff, P. and Lieske, J.H. : 1984, “The Motion of the Earth-Moon System in Modern Tabular Ephemerides”, Astron. Astrophys. , 130, 211–226.Google Scholar
Williams, J.G. and Standish, E.M. : 1989, “Dynamical Reference Frames in the Planetary and Earth-Moon Systems”, in Reference Frames (Kovalevsky, J., Mueller, I. I. and Kolaczek, B., eds.) Kluwer Academic Publishers, Dordrecht, 67–90.Google Scholar