Other
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20513507s&link_type=abstract
American Astronomical Society Meeting 205, #135.07; Bulletin of the American Astronomical Society, Vol. 36, p.1565
Other
Scientific paper
The Space Interferometry Mission will conduct multiple observations of stars and other astronomical objects to obtain positions, proper motions and parallax information, and ultimately to search for extrasolar planets. The observation sequence for each object will be conducted over the life of the mission (5-10 yr) and the time intervals between observations of an object may vary in a logarithmic or other manner. Where cadence issues are not of concern, objects may be observed at various intervals and all such objects that can be observed within a small (approx. 7.5 degree radial) region of the sky may, for scheduling efficiency, be observed sequentially within that region on a periodic basis. In addition, an astrometric reference grid will be generated by observing, at periodic intervals, a set of known astrometrically stable stars spread uniformly over the celestial sphere. In order to balance competing requirement of observing cadence constraints, grid observation periodicity, and observation efficiency, as well as the desire to maximize the science return over the life of the mission, intensive studies of the "Orange Peel" scheduling plan are being examined. This paper presents an analysis of how well this approach addresses the overall goals of SIM, especially in the areas of parallax measurement and observational cadence efficiency.
Boden Andrew
Schwartz Andrew
Wehrle Ann E.
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