Orbiting stellar interferometer for astrometry and imaging

Details Orbiting stellar interferometer for astrometry and imaging Orbiting stellar interferometer for astrometry and imaging

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apopt..32.1789c&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 32, no. 10, p. 1789-1797.

Astronomy and Astrophysics

Astronomy

2

Astrometry, Hipparcos Satellite, Michelson Interferometers, Spaceborne Astronomy, Angular Resolution, Mission Planning, Synchronous Satellites

Scientific paper

The orbiting stellar interferometer (OSI) is a concept for a first-generation space interferometer with astrometric and imaging goals. The OSI is a triple Michelson interferometer with articulating siderostats and optical delay lines. Two point designs for the instrument are described. The 18-m design uses an 18-m maximum baseline and aperture diameters of 40 cm; the targeted astrometric performance is a wide-field accuracy of 10 microarsec for 16-mag objects in 100 s of integration time and for 20-mag objects in 1 h. The instrument would also be capable of synthesis imaging with a resolution of 5 marcsec, which corresponds to the diffraction limit of the 18-m base line. The design uses a deployed structure, which would fold to fit into an Atlas IIAS shroud, for insertion into a 900-km sun-synchronous orbit. In addition to the 18-m point design, a 7-m point design that uses a shorter base line in order to simplify deployment is also discussed. OSI's high performance is made possible by utilizing laser metrology and controlled-optics technology.

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