Mathematics – Logic
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..777r&link_type=abstract
In: B. Battrick, M.A.C. Perryman and P.L. Bernacca (eds.): HIPPARCOS '97. Presentation of the Hipparcos and Tycho catalogues and
Mathematics
Logic
13
Scientific paper
DIVA (Deutsches Interferometer fur Vielkanalphotometrie und Astrometrie) is a small satellite designed to perform astrometric and photometric observations of at least one million stars. The instrument simultaneously observes two celestial fields of 0.5 degrees diameter each, separated by at least 60 degrees. The optical configuration consists of two Fizeau interferometers with a baseline of 10 cm, one for each field of view. A beam-combining mirror feeds light from both fields into a single telescope. Fringe dispersion is created by objective prisms, one per field of view. DIVA operates in a revolving scanning mode with a scanning law similar to that of Hipparcos. Light is recorded in the focal plane by a CCD mosaic operated in time-delayed integration mode, clocked synchronously with the satellite's rotation. The maximum diameter of the satellite will be about 1 m, the total mass about 100 kg. DIVA will exceed the performance of Hipparcos in all important parameters. It will perform an all-sky survey complete to at least V=10.5 mag. The limiting magnitude will be about V=15.0 mag. After two years of mission DIVA will provide (for V=10.5 mag): parallaxes accurate to 0.3 milliarcseconds (mas); proper motions accurate to 0.5 mas/yr; broad-band photometry with a typical precision of 0.003 mag; and multi-channel intermediate-band photometry with a typical precision of 0.01 mag. For the more than 100000 stars observed by the ESA satellite Hipparcos, proper motions with a typical accuracy of 0.1-0.2 mas/yr will be obtained after combining the DIVA measurements with the Hipparcos results. DIVA will be a technologically ambitious, low-cost space mission. It will be a successor to Hipparcos and an important step towards the proposed ESA astrometric Cornerstone Mission, GAIA. A launch in 2002 is aimed at.
Bastian Ulrich
de Boer Klaas. S.
de Vegt Ch.
Hoeg Erik
Röser Hans-Peter
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