AAE450 Spring 2009
Landing SiteWeak Stability Boundary Transfer
(WSB)
January 29, 2009
1[Kara Akgulian] [Mission Ops][Locomotion]
AAE450 Spring 2009
Lunar Landing Site Mare Cognitum
– 3°S 22°W; ~5km between Surveyor 2, Apollo 12 and Apollo 17
Mare Fecunditatis– 1°S 55°E; ~5km to Luna 16
Mare Insularum– 2°N 26°W; ~5km to Apollo 16
Mare Tranquilitatis– 2°N 25°E; ~5-10km between Ranger 8, Surveyor 5,
Apollo 11
[Kara Akgulian] [Mission Ops][Locomotion]
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AAE450 Spring 2009
WSB Analysis Background
– Uses the lunar and solar gravity to
reduce total ∆V Theoretically
– 25% ∆V savings when comparedto a Hohmann Transfer
– Transfer time 80-100 days Concerns
– Not many missions– Not a lot of physics background, mostly theoretical
[Kara Akgulian] [Mission Ops][Locomotion]
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Figure based on E.A. Belbruno Ref 1
Apogee
AAE450 Spring 2009 [Kara Akgulian] [Mission Ops] [Locomotion]
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AAE450 Spring 2009 [Kara Akgulian] [Mission Ops] [Locomotion]
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http://science.nasa.gov
20oE 30oE
0o
10oN
50oE 60oE
0o
10oN
0o
10oS
0o
10oW
20oW30oW
0o
10oN
AAE450 Spring 2009 [Kara Akgulian] [Mission Ops] [Locomotion]
References E.A. Belbruno, J. Carrico, “Calculation of Weak Stability Boundary Ballistic
Lunar Transfer Trajectories” AIAA/AAS Astrodynamics Specialist Conference, Denver, Colorado, AIAA Paper NO.2000-4142, (August 2000)
C. Circi, P. Teofilatto, “On the Dynamics of Weak Stability Boundary Lunar Transfers” pp 41-72
Topography by http://planetarynames.wr.usgs.gov by NASA and Astrogeology Research Program
List of Mare by http://lunar.arc.nasa.gov/science/atlas/mare/mare.htm by NASA
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