OAA computing section circular NK 547R P/Shoemaker-Levy 2

The following improved orbital elements, by S. Nakano, are from 20 observations 1990 Sept. 17-1991 Jan. 15. Perturbations by Mercury to Neptune and five minor planets, Ceres, Pallas, Vesta, Iris and Bamberga, were taken into account. The mean residual is +/- 0.70 arc second. See previous computation on NK 547. Epoch = 1990 Sept.26.0 TT T = 1990 Sept.25.39338 +/- 0.00971 (m.e.) TT Peri. = 140.07864 +/- 0.02392 Node = 235.99576 +/- 0.02357 (2000.0) Inc. = 4.63719 +/- 0.00168 q = 1.8440507 +/- 0.0001660 AU e = 0.5823057 +/- 0.0000215 a = 4.4148330 +/- 0.0003260 AU n' = 0.10625091 +/- 0.00001176 P = 9.276 +/- 0.0010275 years (+/- 0.38 day) The predicted orbit for the 2000 return is as follows: T = 2000 Feb. 6.53198 TT Epoch = 2000 Feb. 26.0 TT Peri. = 142.02692 e = 0.5798245 Node = 234.75325 (2000.0) a = 4.4473327 AU Inc. = 4.65694 n'= 0.10508837 q = 1.8686605 AU P = 9.379 years The following residuals in seconds of arc are from the above orbital elements: 19/ 19/ 19/ 900917 675 0.4- 0.0 901113 675 0.3+ 1.9- 901212 568 0.6- 0.0 900917 675 0.7+ 0.5+ 901115 675 1.0- 1.1+ 901215 801 0.3+ 0.1+ 900920 675 0.9+ 1.1- 901115 675 1.6+ 0.8- 901215 801 0.5+ 0.1- 901014 675 0.7- 0.1- 901207 688 0.7+ 0.2+ 901218 413 0.1- 0.2+ 901016 675 0.4- 0.4+ 901207 688 0.7+ 0.1+ 910115 688 0.5- 0.1- 901025 675 0.4- 1.1+ 901207 372 (2.2- 0.4-) 910115 688 0.6+ 0.0 901025 675 1.1- 0.3+ 901207 372(11.7- 0.4+) 901113 675 0.6+ 0.0 901211 568 1.4- 0.1- ( ) -------- Rejected Obs.

Director, Computing Section Computed date Syuichi Nakano 1991 Feb. 2

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