Toward The Ultimate Accuracy Of The GlobalAstrometric Grid With The Space Interferometry Mission

Details Toward The Ultimate Accuracy Of The GlobalAstrometric Grid With The Space Interferometry Mission Toward The Ultimate Accuracy Of The GlobalAstrometric Grid With The Space Interferometry Mission

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dda....37.1402m&link_type=abstract

American Astronomical Society, DDA meeting #37, #14.02; Bulletin of the American Astronomical Society, Vol. 38, p.675

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Global astrometric reference frames may be ultimately limited to 1 micro-arcsecond accuracy by the effects of gravitational scintillation (stochastic microlensing), non-stationary gravitational bending of light in the Galactic
potential, gravitational waves, acceleration of the Sun in the Galaxy, and acceleration of the Galaxy. The Space Interferometry Mission is expected to construct an optical reference frame to unprecedented accuracy based on a limited number of grid objects uniformly positioned across the sky. The global accuracy of this frame may be brought close to the ultimate threshold if the SIM grid is anchored to a number of extragalactic objects (mostly QSOs), whose positions can be considered fixed in the cosmological frame. These objects, observed by SIM alongside the regular grid stars, will help to constrain sky-correlated errors in parallaxes and, possibly, proper motions of science targets. They can be used to determine the residual position rotation of the SIM coordinate system and the residual spin of the proper motion system with respect to the quasi-inertial (non-rotating) extragalactic reference system. We estimate the gain in accuracy of the SIM astrometric grid and of the extragalactic tie, given realistic assumptions on the number and brightness of grid quasars, available mission time and observing schedule.

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