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21 July 2010 SCDU (Spectral Calibration Development Unit) testbed narrow angle astrometric performance
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The most stringent astrometric performance requirements on NASA's SIM(Space Interferometer Mission)-Lite mission will come from the so-called Narrow-Angle (NA) observing scenario, aimed at finding Earth-like exoplanets, where the interferometer chops between the target star and several nearby reference stars multiple times over the course of a single visit. Previously, about 20 pm NA error with various shifts was reported1. Since then, investigation has been under way to understand the mechanisms that give rise to these shifts. In this paper we report our findings, the adopted mitigation strategies, and the resulting testbed performance.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Xu Wang, Renaud Goullioud, Bijan Nemati, Michael Shao, Udo J. Wehmeier, Mark A. Weilert, Thomas A. Werne, Janet P. Wu, and Chengxing Zhai "SCDU (Spectral Calibration Development Unit) testbed narrow angle astrometric performance", Proc. SPIE 7734, Optical and Infrared Interferometry II, 77344J (21 July 2010);

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