Complementary astrophysical data for Hipparcos stars. (1) Astrophysical fundamental parameters of early-type Hipparcos stars. (2) Radial velocities of southern late-type Hipparcos stars. Profile of two key programmes.

Details Complementary astrophysical data for Hipparcos stars. (1) Astrophysical fundamental parameters of early-type Hipparcos stars. (2) Radial velocities of southern late-type Hipparcos stars. Profile of two key programmes. Complementary astrophysical data for Hipparcos stars. (1) Astrophysical fundamental parameters of early-type Hipparcos stars. (2) Radial velocities of southern late-type Hipparcos stars. Profile of two key programmes.

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989msngr..56...12g&link_type=abstract

The Messenger, vol. 56, p. 12-15

Astronomy and Astrophysics

Astronomy

13

Hipparcos: Space Astrometry

Scientific paper

Hipparcos, the satellite of the European Space Agency to be launched in July 1989, is the first satellite ever devoted to global astrometry (Fig. 1). The basic principle of observation is to scan continuously and systematically the whole sky with a telescope capable of measuring the angle between stars separated by a large angle (Fig. 2). The telescope is of Schmidt reflective type, the. angles are measured by superimposing - by use of a complex mirror - in the focal plane of the telescope two fields of view separated by a "basic angle" of 58", each field containing one of the stars in a pair. The satellite is designed to spin slowly, scanning the entire sky by means of the combination of two motions: a spinning rotation around the axis normal to the two lines of sight and a revolution of the spin axis around the satellite-Sun line. The angle between the spin axis and the Sun is 43".

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