Inertial Coordinate System on the Sky: Proceedings of the by J. H. Lieske (auth.), Jay H. Lieske, Victor K. Abalakin PDF

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Additional info for Inertial Coordinate System on the Sky: Proceedings of the 141st Symposium of the International Astronomical Union Held in Leningrad, U.S.S.R., October 17–21, 1989

Sample text

R-i ttl cJ 'M N 0 ci ..... 0 0 0 0 1'0< 0 --t :; ~ LI ..... :j" - ci ..... 0 0 co ...... w -. -< H -. _J If) Fig. 3 - Various values of the general precession in longitude, reduced to 1850 (from Newcomb 1898, p. 10). Circles with crosses represent values based in part on Dorpat data. Squares represent values based in part on Pulkovo data. 25656 arcsec per tropical year (Lieske et al. 1977, p. 14), and is indicated by the horizontal line. 2025). In Fig.

And we encourage the ESA to construct a second HIPPARCOS with minimum delay. The old ground-based catalogs are now even more important than they were before, as they will carry great weight when used with HIPPARCOS data to provide very accurate proper motions. The Hubble Space Telescope, hopefully to be launched next year, promises galacticextragalactic connections (quasars-HIPPARCOS Stars) and other relative astrometry with great precision. We heard about three proposed USSR astrometric satellites, AIST, Regatta, and Lomonosov, and one proposed USA satellite, POINTS, all projects aimed at achieving very precise global reference frame data in the next ten to fifteen years.

S. Naval Observatory, and even Mauna Kea, had very uncertain and modest beginnings. Occasionally, however, it was planned to establish an observatory which would have, from the very start, a number of world class instruments. For a few this aim was, to a large extent, achieved. Tycho Brahe's island observatory was one such institution, where upwards of 17 instruments were built and used (Krisciunas 1988, pp. 49 and 53). Another institution that can be included in this category is Pulkovo Observatory, whose 150th birthday we celebrate this year.

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