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Books > Science & Mathematics > Astronomy, space & time > Theoretical & mathematical astronomy
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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 (Paperback, Softcover reprint of the original 1st ed. 1995)
Loot Price: R3,055
Discovery Miles 30 550
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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 (Paperback, Softcover reprint of the original 1st ed. 1995)
Series: International Astronomical Union Symposia, 166
Expected to ship within 10 - 15 working days
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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 dynamical reference frame
of the solar system with accuracies of 100 milliarcseconds to a
space-fixed, extragalactic reference frame with accuracies of one
milliarcsecond. Future astrometric observations should be in the 1
-100 milliarcsecond accuracy range. There are a number of concepts
for future astrometric instruments in space. Most of these can
provide sub-milliarcsecond astrometric accuracies."
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