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Lars, The ephemeris from the

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17 November 2018 at 11:37 pm #580253
Nick James
Participant

Lars, The ephemeris from the MPC that Peter gave is about as good as it gets. Any differences in the 1981 ephemeris will be due to a different epoch (B1950 vs J2000) and fewer observations. I’ve attached an ephemeris from JPL Horizons wich is very similar to the MPC one. I’ve also attached a scan of BAA Circular 615 from 1981 March 4 which includes an ephemeris based on only 12 positions over a short arc so you can compare.