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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