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Janus Trajectory DesignThe proposed Janus Discovery Class mission will pass over opposite illuminated hemispheres of the planet Mercury on two successive flybys and will pass over a crater near Mercury's South geographic pole on the third and final flyby. Three probes will be released by the main spacecraft prior to the first Mercury flyby to pass over Mercury's geographic poles and over the anti-Sunward side. The science team wanted to complete the first Mercury flyby within approximately 110 days of launch and the second Mercury flyby within approximately 365 days of launch. A direct trajectory was chosen which met the basic constraints of the science team while meeting the Discovery launch vehicle constraints. The objective of this paper is to serve as an overview of the Janus trajectory design. The proposal submitted in June 1998 provides a comprehensive overview of the Janus mission.
Document ID
Document Type
Conference Paper
Marr, Gregory C.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
August 19, 2013
Publication Date
May 1, 1999
Publication Information
Publication: 1999 Flight Mechanics Symposium
Subject Category
Distribution Limits
Work of the US Gov. Public Use Permitted.
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