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Proceedings Paper

SIM astrometric grid
Author(s): Raymond Swartz
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Paper 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.

Paper Details

Date Published: 26 February 2003
PDF: 10 pages
Proc. SPIE 4852, Interferometry in Space, (26 February 2003); doi: 10.1117/12.460861
Show Author Affiliations
Raymond Swartz, Jet Propulsion Lab. (United States)


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

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