Physics – Optics
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998baas...30..764s&link_type=abstract
American Astronomical Society Meeting, 191, #128.07
Physics
Optics
Scientific paper
Natural occultations and coronagraphs have been used to study sources with high brightness contrasts. However a large schedulable occulting satellite would have benefits over either, and could compliment other proposed technologies for planet detection, in particular advanced adaptive optics systems and stellar coronagraphs. Such a satellite could also be used to achieve milli-arcsecond resolution of bright compound sources, such as microlensed images of Galactic and LMC giants, binary stars, nearby clusters, etc. Finally, using tomographic reconstruction techniques, it could be used to image solar system bodies, and other resolvable sources, down to few milli-arcsecond scales. The Improved Resolution and Image Separation Satellite (IRIS), could operate conjunction with ground-based telescopes in an eccentric high-apogee Earth orbit, allowing optimal utilization of continued improvements in adaptive optics and other telescope and detector technologies. Alternatively, it could be placed in orbit at the L2 point of the Earth's orbit together with a 1-2m class telescope, affording improved seeing and possibly simplified orbital dynamics. In Earth orbit, careful selection of orbital parameters to produce velocity matching between the satellite and the ground-based observer, allow occultation events to last up to 2400 seconds, with over 90% of the sky accessible with integrations longer than 400s for most major telescope locations (e.g. Hawaii, Chile). Even longer integrations can be achieved at the L2 point with station-keeping.
Copi Craig J.
Starkman Glenn
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