The satellite HIPPARCOS

Details The satellite HIPPARCOS The satellite HIPPARCOS

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.177...15k&link_type=abstract

In ESA The Sci. Aspects of the Hipparcos Space Astrometry Mission p 15-20 (SEE N82-30146 20-88)

Astronomy and Astrophysics

Astronomy

4

Astrometry, Constraints, Esa Satellites, European Space Programs, Satellite Design, Spaceborne Astronomy, Accuracy, Functional Design Specifications, Instrument Errors, Mission Planning, Star Distribution

Scientific paper

An astrometry satellite is described. Constraints to be taken into account in observation programs are outlined. A complex mirror with two plane surfaces directs two fields into a single telescope. The two images are superimposed on a grid on the focal surface of the telescope. Sources of measurement error include: random signal instabilities; insufficient modelling of the instrument; attitude uncertainty; and photon statistics. For observation programs, stars between Cassiopeia and Aquila, or Centauris and Canis Major are preferable. Faint stars have a maximum chance of getting more time if the absolute value of their ecliptic latitude exceeds 50 deg. If possible, avoid the galactic plane when choosing stars for their physical characteristics; do not expect to have more than four stars/sqdeg; and indicate on lists of stars what could be omitted.

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