Physics – Optics
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..795y&link_type=abstract
Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 795-798
Physics
Optics
4
Scientific paper
LIGHT is the name of a scanning astrometric satellite for stellar and galactic astronomy planned to be launched between 2007 and 2010. Four sets of Fizeau-type interferometers with a beam combiner unit of 1m baseline are the basic structure of the satellite optics. LIGHT is expected to observe the parallaxes and proper motions of nearly a hundred million stars up to V=18 mag (K=15 mag) magnitude with the precision better than 0.1 milliarcsec (about 50 microarcsec in V-band and 90 microarcsec in K-band) in parallaxes and better than 0.1 milliarcsec per year in proper motions, as well as the precise photometric characteristics of the observed stars. Almost all of the giant and supergiant stars belonging to the disk and halo components of our Galaxy within 10 to 15kpc from the sun will be observed by LIGHT to study the most fundamental structure and evolution of the Galaxy. LIGHT will become a precursor of a more sophisticated future astrometric interferometer satellite like GAIA (Lindegren & Perryman 1996).
Fukushima Takehiro
Miyamoto Manabu
Nishikawa Jared
Sato Kachishige
Yoshizawa Masahito
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