VLBI FOR <i>GRAVITY PROBE B</i> . V. PROPER MOTION AND PARALLAX OF THE GUIDE STAR, IM PEGASI
VLBI FOR <i>GRAVITY PROBE B</i> . V. PROPER MOTION AND PARALLAX OF THE GUIDE STAR, IM PEGASI
We present the principal astrometric results of the very-long-baseline interferometry (VLBI) program undertaken in support of the Gravity Probe B (GP-B) relativity mission. VLBI observations of the GP-B guide star, the RS CVn binary IM Pegasi (HR 8703), yielded positions at 35 epochs between 1997 and 2005. We discuss the …