1. [Andrew Damon] [Mission Ops]
Preliminary Trans-Lunar Injection Analysis
January 22, 2009
[Andrew Damon] [Mission Ops]

2. Assumptions for Initial Transfer
Two Body Problem: allows use of conics
Launch from Kennedy Space Center: inclination of 28.5˚
Hohmann Transfer to moon w/ Lunar capture
Coplanar earth and lunar parking orbits
- Possible but rare, would limit launch window
- Plane change likely before transfer
Circular lunar orbit about earth
- Slightly eccentric in reality: e ≈ .0549
Method of patched conics
- Good approximation for outbound ΔV calculations
[Drew Damon] [Mission Ops]

3. Hohmann Transfer ΔV Calculations
First burn: ΔV1 = 3.13 km/s
Second burn (Lunar Capture): ΔV2 = 0.82 km/s
ΔVtot = 3.95 km/s
Next Steps:
Determine the 3-D transfer requirements
Recalculate transfer with more accurate values
Investigate bielliptic transfer, low thrust, and other alternative transfer methods
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