Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.177....3l&link_type=abstract
In its The Sci. Aspects of the Hipparcos Space Astrometry Mission p 3-12 (SEE N82-30146 20-88)
Astronomy and Astrophysics
Astronomy
3
Astrometry, Mission Planning, Spaceborne Astronomy, Astronomical Coordinates, Data Acquisition, Data Smoothing, Satellite Attitude Control, Star Distribution, Stellar Magnitude
Scientific paper
A plan to provide coordinates of 400,000 stars of magnitude 10 to 12 with uncertainties from 0.02 to 0.06 arcsec is outlined. The B and V magnitudes are estimated with uncertainties from 0.02 to 0.06 mag, color indices with uncertainties from 0.03 to 0.10 mag. Data are collected by the Hipparcos satellite, scanning the sky, under permanent active attitude control. The reference system is derived from angular measurements. Satellite attitude motion is deduced from transit time data of reference stars. Star position is derived from a combination of satellite attitude data and transit times. Data smoothing techniques and equipment modifications which improve accuracy are discussed.
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