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Cis-Lunar Gateways and the Advantages of Near Rectilinear Orbits

6 Jun 2018, 02:11 UTC
Cis-Lunar Gateways and the Advantages of Near Rectilinear Orbits
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Computer illustration of Near Rectilinear Orbits between EML1 and EML2 (Credit: NASA). NASA appears to have settled on a Near Rectilinear L2 Halo Orbit (NRO) for its future Deep Space Habitat (DSH). NROs are a subset of of L1 or L2 halo orbits. NRO's have large amplitudes over either the north or south lunar poles with shorter periods that pass closely to the opposite pole. Station keeping at an NRO would require a delta-v of only 5 m/s per year. With an impulsive departure from LEO at about 3.124 km/s, a crewed spacecraft would reach an L2 NRO in about 5.33 days. Orbital capture would require a delta-v of 0.829 km/s. An EML1 location for a DSH would only require a delta-v of 3.77 km/s and four days of travel time. But 2 days of travel time would be required for a journey from EML1 to Low Lunar Orbit (LLO). An NRO location, however, would only require 12 hours of travel time to LLO. So the surface of the Moon could be accessed from a NRO located Deep Space Hab in just 12 hours.Possible Cis-Lunar Locations for a DSH (Deep Space Habitat)EML1(Earth-Moon Lagrange Point One):Travel time to and from LEO: ...

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