Cool Stars 14 - Submitted Abstract # 287 This version created on 05 October 2006 Detection of Terrestrial Planets with SIM/PlanetQuest Chris McCarthy, San Francisco State University Debra Fischer, San Francisco State University Geoff Marcy, U. C. Berkeley The Space Interferometry Mission will return unprecedented astrometric precision approaching 1 microarcsecond, enabling the detection of planets with masses few times the mass of the Earth around the nearest stars. To achieve such precision in narrow angle mode, SIM requires an exquisitely stable reference frame established by distant background stars, each within 1 degree of a target star. We present precise Keck radial velocity measurements of SIM reference stars and current status of SIM's search for extrasolar terrestrial planets. ----------------------------------