Full Name Gravity Probe B Status Mission complete
Mission Agencies NASA Launch Date 20 Apr 2004
Mission Links EOL Date 08 Dec 2010
EO Portal Info NORAD Catalog #
International Designator
Orbit Type Orbit Period 97.5 minutes
Orbit Sense Orbit Inclination 90 deg
Orbit Altitude 642 km Orbit Longitude
Orbit LST Repeat Cycle
Objectives and Applications The overall objective is to provide two extremely precise new tests of Einstein's theory of gravity, namely the General Theory of Relativity (formulated in 1916 - it states that gravity affects time and distance, by stretching time and contracting distance in the presence of a gravitational field) by means of observations on gyroscopes in Earth orbit.
Mission Measurements
Mission Instruments
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