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Proceedings Paper

Performance of the GP-B cryogenic guide-star telescope detectors
Author(s): John H. Goebel; Robert P. Farley; George M. Keiser; Jon Kirschenbaum; John P. Turneaure; Suwen Wang
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Paper Abstract

Gravity Probe-B (GP-B) is a space mission that was launched in April 2004 that is intended to measure the prediction by General Relativity Theory that a rotating gravitational field, namely the Earth's, "drags" the space-time continuum by a definite amount. GP-B utilizes a telescope with silicon photodiode detectors. Light from a distant reference frame, namely, a star designated as IM Peg, is used to reference the orbital motion of the spacecraft about the Earth and Sun to within 200 milliarcseconds at a frequency of 10 Hz. Fine angular control of the spacecraft orientation uses the signals from the telescope detectors during the 55 minute portion of the orbit during which the star is visible. The performance of the detectors and the control system's resultant pointing are discussed.

Paper Details

Date Published: 13 September 2005
PDF: 5 pages
Proc. SPIE 5881, Infrared and Photoelectronic Imagers and Detector Devices, 588116 (13 September 2005); doi: 10.1117/12.649702
Show Author Affiliations
John H. Goebel, NASA Ames Research Ctr. (United States)
Robert P. Farley, Lockheed-Martin Missiles and Space (United States)
George M. Keiser, Stanford Univ. (United States)
Jon Kirschenbaum, Lockheed-Martin Missiles and Space (United States)
John P. Turneaure, Stanford Univ. (United States)
Suwen Wang, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 5881:
Infrared and Photoelectronic Imagers and Detector Devices
Randolph E. Longshore, Editor(s)

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