1. Landing Site Weak Stability Boundary Transfer (WSB)
January 29, 2009
[Kara Akgulian] [Mission Ops]
[Locomotion] 1

2. [Kara Akgulian] [Mission Ops]
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]

3. WSB Analysis Background Theoretically 25% ∆V savings when compared
Apogee
Background
Uses the lunar and solar gravity to
reduce total ∆V
Theoretically
25% ∆V savings when compared
to a Hohmann Transfer
Transfer time days
Concerns
Not many missions
Not a lot of physics background, mostly theoretical
Figure based on E.A. Belbruno Ref 1
[Kara Akgulian] [Mission Ops]
[Locomotion] 3

4. [Kara Akgulian] [Mission Ops] [Locomotion]4

5. [Kara Akgulian] [Mission Ops] [Locomotion]
30oW
20oW
20oE
30oE
10oN 0o 0o
10oS
50oE
60oE
10oW 0o
[Kara Akgulian] [Mission Ops] [Locomotion]

6. [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 , (August 2000)
C. Circi, P. Teofilatto, “On the Dynamics of Weak Stability Boundary Lunar Transfers” pp 41-72
Topography by by NASA and Astrogeology Research Program
List of Mare by by NASA
[Kara Akgulian] [Mission Ops] [Locomotion]