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Preliminary Trans-Lunar Injection Analysis

January 22, 2009. Preliminary Trans-Lunar Injection Analysis. 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

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Preliminary Trans-Lunar Injection Analysis

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

  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 [Name] [Group] • 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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