Dealing With Companions In The SIM Astrometric Grid

Details Dealing With Companions In The SIM Astrometric Grid Dealing With Companions In The SIM Astrometric Grid

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...206.1417s&link_type=abstract

American Astronomical Society Meeting 206, #14.17; Bulletin of the American Astronomical Society, Vol. 37, p.455

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SIM-Planetquest relies on a grid of 1302 stars covering the sky to determine instrument parameters such as baseline length, orientation, and other calibration values. It is necessary that these stars be well-understood to 4 microarcseconds astrometric precision. While pre-mission ground observations attempt to eliminate stars with complex behavior from the grid, we still expect 60% of the final grid stars to have companions. If not corrected for this effect, the companions will render the grid insufficient. This study shows that we can create a usable grid by detecting and compensating for these complex motions by use of delay residuals and adding acceleration terms to the stellar parameters.

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