Apparent and geometric star positions for the HIPPARCOS mission

Details Apparent and geometric star positions for the HIPPARCOS mission Apparent and geometric star positions for the HIPPARCOS mission

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mange..11..103w&link_type=abstract

Manuscripta Geodaetica (ISSN 0340-8825), vol. 11, June 1986, p. 103-114.

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3

Astrometry, Astronomical Coordinates, Hipparcos Satellite, Data Reduction, Position Errors, Stellar Motions

Scientific paper

By analogy with earth-bound astrometrical observations, space astrometry needs geometric and apparent positions which are adapted to the specific location and motion of the observer in space. Geometric and apparent positions are presently defined, and the mode of application to the Hipparcos data reduction is described. Two independent approaches are treated, one using ecliptic, the other equatorial coordinates. Both methods agree within 0.0005 mas for the geometrical positions and 0.001 mas for the apparent positions. On the basis of the uncertainties of the earth's and spacecraft's positions, the external error of the apparent positions is estimated at 0.2 mas.

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