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Giotto Extended Mission (GEM)The primary objectives of the Giotto Extended Mission (GEM), are to determine the composition and physical state of the Grigg Skjellerup Comet's nucleus; to determine the processes that govern the composition and distribution of neutral and ionized species in the cometary atmosphere. Giotto consists of a single European Space Agency (ESA) spacecraft that was launched in 1985 from Center Spatial Guyanis in French Guiana on an Ariane launch vehicle. After a successful launch into geostationary orbit and a heliocentric transfer trajectory, the spacecraft successfully encountered Halley's Comet in 1986. One month after encountering Halley's Comet, Mar. 1986, the spacecraft was placed in hibernation in a heliocentric orbit slightly less than 1 AU. Between Feb. and Jul. 1990 the spacecraft was successfully reactivated, checked out, and placed on a trajectory course to intercept comet Grigg Skjellerup. The spacecraft has been in hibernation since Jul. 1990. Information is presented in tabular form in the following areas: coverage goals, Deep Space Network Support, frequency assignments, telemetry, command, and tracking support responsibility.
Document ID
19920003886
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wilkins, D. E. B.
(European Space Agency. European Space Operations Center Darmstadt, Germany)
Grensemann, M.
(European Space Agency. European Space Operations Center Darmstadt, Germany)
Date Acquired
September 6, 2013
Publication Date
October 1, 1991
Publication Information
Publication: JPL, California Inst. of Tech., Deep Space Network: Mission Support Requirements
Subject Category
Astronautics (General)
Accession Number
92N13104
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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