OAA computing section circular NK 412R D/1978 C2 (Tritton)

The following improved orbital elements, by S. Nakano, are from seven observations 1978 Feb. 11 to Mar. 14. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.84 arc second. Epoch = 1977 Oct. 24.0 TT T = 1977 Oct. 28.62450 +/- 0.13644 (m.e.) TT Peri. = 147.68112 +/- 0.15239 Node = 300.75521 +/- 0.14793 (2000.0) Inc. = 7.03843 +/- 0.02237 q = 1.4385249 +/- 0.0059035 AU e = 0.5802909 +/- 0.0012376 a = 3.4274332 +/- 0.0050534 AU n' = 0.15532829 +/- 0.00034352 P = 6.345 +/- 0.0140332 years (+/- 5.13 days) The predicted orbit for the 2003 return is as follows: T = 2003 Mar. 4.03631 TT Epoch = 2003 Mar. 22.0 TT Peri. = 147.69740 e = 0.5820056 Node = 300.62682 (2000.0) a = 3.4168867 AU Inc. = 7.06313 n'= 0.15604800 q = 1.4282395 AU P = 6.316 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1978/ 780215 413 1.2+ 0.4- 780313 801 1.0- 0.2+ 780211 413 0.1+ 0.2+ 780310 801 0.3+ 1.2+ 780314 801 1.2+ 1.5- 780213 413 1.2- 0.0 780311 801 0.6- 0.3+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1999 May 5

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