The Operational Environment of the Hipparcos Mission |
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Authors: | van Leeuwen Floor Penston Margaret J |
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Institution: | (1) Institute of Astronomy, Madingley Road, Cambridge, U.K |
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Abstract: | We investigate links between the observational environment as experienced by the Hipparcos satellite and the performance of
the spacecraft and payload instrumentation, with particular emphasis on finding out whether some of these effects may have
been inadequately represented in instrument calibrations and could thus have affected the scientific results of the mission.
Scan-coverage and radiation effects are primarily random effects with only some long-term systematics. However, long- (days
to weeks) and short-term (hours) temperature variations reflected in the performance of some of the spacecraft instrumentation.
It is shown that only a small sign of some long-term thermal variations could be detected in the payload instrumentation.
These findings further limit the scope left for the occurrence of large-scale correlated errors in the Hipparcos astrometric
data. On the other hand, a number of great circles were identified which showed a highly significant drift of the basic angle,
which had not been detected in the preparation of the published data. The data from these circles may have, in some cases,
led to, very localised, slightly anomalous results, in particular where stars are accidentally affected by two or more of
such circles.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | Hipparcos Satellite dynamics Space Astrometry |
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