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Astronomical and astrophysical objectives of sub-milliarcsecond optical astrometry : proceedings of the 166th Symposium of the International Astronomical Union, held in The Hague, the Netherlands, August 15-19, 1994 by R. C. Stone, C. C. Dahn (auth.), Erik Høg, P. Kenneth Seidelmann (eds.) is a nonfiction available to read on EtoBox.

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Astrometry is on the threshold of great changes due to the fact that this decade, alone, is witnessing an improvement of stellar positions equivalent to the total improvement of the previous two centuries. The Hipparcos Satellite has concluded its observations, and the catalog is in preparation. Preliminary results assure that the Hipparcos catalog will provide positions, parallaxes and annual proper motions for over 100,000 stars with accuracies of 1.5 milliarcseconds. In addition, the Tycho catalog will provide positions of about 30 milliarcseconds accuracy for over 1 million stars, and annual proper motions with 3 milliarcsecond accuracy will subsequently be ob tained by means of first epoch positions from the Astrographic Catalog. Optical interferometers on the ground are beginning operation, and these instruments can provide observational accuracies of approximately one milliarcsecond. Also, the traditional reference frame based on the Fun damental Catalog of bright stars is being replaced by the extragalactic ref erence frame, based on radio sources with accuracies of one milliarcsecond. Thus, astrometry will change from a fundamental reference frame defined in terms of the d

Who reads Astronomical and astrophysical objectives of sub-milliarcsecond optical astrometry : proceedings of the 166th Symposium of the International Astronomical Union, held in The Hague, the Netherlands, August 15-19, 1994?

Author

R. C. Stone, C. C. Dahn (auth.), Erik Høg, P. Kenneth Seidelmann (eds.)

Publisher

Springer Netherlands : Imprint : Springer

Published

1995

Language

EN

ISBN

9780792334439

Category

nonfiction

Subjects

Science, Technology, Mathematics