SIM astrometric grid

Raymond Swartz

doi:10.1117/12.460861

26 February 2003 The SIM astrometric grid

Raymond Swartz

Proceedings Volume 4852, Interferometry in Space; (2003) https://doi.org/10.1117/12.460861
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

The Space Interferometry Mission (SIM) is fundamentally a one-dimensional instrument with a 15-degree field-of-regard. Mission objectives require a global reference grid of thousands of well-understood stars with positions known to 4 microarcseconds which will be used to establish the instrument baseline vector during scientific observations. This accuracy will be achieved by frequently observing a set of stars throughout the mission and performing a global fit of the observations to determine position, proper motion and parallax for each star. Each star will be observed approximately 200 times with about 6.5 stars per single instrument field on the sky. We describe the nature of the reference grid, the candidate objects, and the results of simulations demonstrating grid performance, including estimates of the grid robustness when including effects such as instrument drift and possible contamination of the grid star sample by undetected binaries.

Citation Download Citation

Raymond Swartz "The SIM astrometric grid", Proc. SPIE 4852, Interferometry in Space, (26 February 2003); https://doi.org/10.1117/12.460861

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