Science telescope for Gravity Probe B

Details Science telescope for Gravity Probe B Science telescope for Gravity Probe B

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.5172..108w&link_type=abstract

Cryogenic Optical Systems and Instruments X. Edited by Heaney, James B.; Burriesci, Lawrence G. Proceedings of the SPIE, Volume

Computer Science

Performance

1

Scientific paper

The Gravity Probe B Relativity Mission uses a fused-quartz optical star tracking telescope as the sensor for the control system which points the spacecraft towards its guide star. The telescope is cooled to <5 K while the readout which uses photodiodes and JFET preamps operates at 72 K. It is mounted on the front end of the telescope with a thermal standoff. Analysis indicates that the telescope is capable of providing sub-milli-arc- second (marcs)pointing stability information with an angular pointing noise of 21 marcs/√Hz for the guide star IM Pegasi. We describe the design of the telescope and test results under nominal operating conditions. Analysis of the expected performance of the telescope in flight, based on the test results, is also presented.

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