Hi Bill, Your new orbits look good to me. The location of perigee is close to the line of the lunar antipode, near the points for a 4.1 or 4.2 day coast to the Moon. Using the Chang'e 2 parking orbit, which was launched due east from Xichang, I find that for the Chang'e 4 launch time TLI would occur near 18:31:35 UTC, when passing the lunar antipode for a 3.7 day lunar coast. 3.7 days after TLE would be December 11, 11:20 UTC, so within 6 hours of the time quoted. Should you want to try to find a TLI solution, the propagated Chang'e 2 parking orbit at the TLI moment yields this J2000 state vector: mjd = 58459.77193287 r = [-3854.9675, +4919.8207, +2235.5667] km v = [-6.26989, -3.65939, -2.73456] km/s Regards, Cees _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Sat Dec 08 2018 - 13:53:06 UTC
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