Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.177...21h&link_type=abstract
In ESA The Sci. Aspects of the Hipparcos Space Astrometry Mission p 21-25 (SEE N82-30146 20-88)
Astronomy and Astrophysics
Astronomy
7
Astrometry, European Space Programs, Star Trackers, Stellar Spectrophotometry, Data Reduction, Star Distribution, Stellar Luminosity, Stellar Magnitude, Variable Stars
Scientific paper
The use of the Hipparcos satellite star mappers (originally intended for attitude control) to collect data on 400,000 stars brighter than B=11 mag is described. By fitting the star mappers with B and V color fitters, positional accuracy of 0.03 arcsec and 0.03 mag for B and V magnitudes are feasible. In a 2.5 yr mission, 90 position observations, and 45 magnitude observations can be obtained for an average star. Magnitude data can be used to study variables. While only 20,500 variables of all magnitudes are recorded in 1969 catalogs, at least 33,000 of magnitude brighter than V=10 are predicted for Tycho. The experiment is very cost efficient compared with ground based astrometry; the equivalent of 5000 man years for meridian observations and 500 for astrographic observations are obtained for 10 man years of data reduction.
Hoeg Erik
Jaschek Carlos
Lindegren Lennart
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