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Proceedings Paper

High-precision early mission narrow-angle science with the Space Interferometry Mission
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Paper Abstract

We have developed a technique that allows SIM to measure relative stellar positions with an accuracy of 1 micro-arcsecond at any time during its 5-yr mission. Unlike SIM's standard narrow-angle approach, Gridless Narrow Angle Astrometry (GNAA) does not rely on the global reference frame of grid stars that reaches full accuracy after 5 years. GNAA is simply the application of traditional single-telescope narrow angle techniques to SIM's narrow angle optical path delay measurements. In GNAA, a set of reference stars and a target star are observed at several baseline orientations. A linearized model uses delay measurements to solve for star positions and baseline orientations. A conformal transformation maps observations at different epochs to a common reference frame. The technique works on short period signals (P=days to months), allowing it to be applied to many of the known extra-solar planets, intriguing radio/X- ray binaries, and other periodic sources. The technique's accuracy is limited in the long-term by false acceleration due to a combination of reference star and target star proper motion. The science capability, 1 micro-arcsecond astrometric precision, is unique to SIM.

Paper Details

Date Published: 26 February 2003
PDF: 11 pages
Proc. SPIE 4852, Interferometry in Space, (26 February 2003); doi: 10.1117/12.460738
Show Author Affiliations
Stuart B. Shaklan, Jet Propulsion Lab. (United States)
Mark H. Milman, Jet Propulsion Lab. (United States)
Xiaopei Pan, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 4852:
Interferometry in Space
Michael Shao, Editor(s)

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