The link to extragalactic objects

Details The link to extragalactic objects The link to extragalactic objects

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989hmps....2..199a&link_type=abstract

In its The Hipparcos Mission. Prelaunch Status. Volume 2: The Input Catalog p 199-211 (SEE N90-13529 05-18)

Astronomy and Astrophysics

Astronomy

Data Links, Extragalactic Radio Sources, Ground Operational Support System, Hipparcos Satellite, Hubble Space Telescope, Intergalactic Media, Astronomical Catalogs, European Space Programs, Optimization, Sky Surveys (Astronomy), Stellar Motions, Time Measurement

Scientific paper

The work performed to ensure the Hipparcos catalog optimal link, to both the radio reference frame and a quasi inertial frame, is reported. The review of the observational proposals and the identification of shortcomings are effectuated. Two kinds of links are considered: the coordinates at a state epoch, and the proper motions. The proper motions are measured relative to extragalactic objects. The methods applied by the input catalog (INCA) working group include the direct observations by Hipparcos, the use of a Hubble space telescope, and the direct photography established by a ground based link.

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