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Forum: Satellites - Robotic Probes
Topic: China's Queqiao lunar communication satellites

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Message to Edit: HTML is ON UBB Code is ON Smilies Legend	Originally posted by Robert Pearlman on 05-23-2018 09:39 PM Apparently, NASA considered an L2 halo orbit to support a communications relay for a far side Apollo mission, but ultimately the concept (and, of course, the mission) never came to be. See [URL=https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19680015886.pdf]Lunar Far-Side Communication Satellites[/URL] (1968). Also, per Wikipedia: <BLOCKQUOTE>[i]Robert W. Farquhar first used the name "halo" for these orbits in his 1968 Ph.D. thesis. Farquhar advocated using spacecraft in a halo orbit on the far side of the Moon (Earth-Moon L2) as a communications relay station for an Apollo mission to the far side of the Moon. A spacecraft in such a halo orbit would be in continuous view of both the Earth and the far side of the Moon.[/i]</BLOCKQUOTE>
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