OAA computing section circular NK 655 D/1984 W1 (Shoemaker 2)

The following improved orbital elements, by S. Nakano, are from seven observations 1984 Nov. 18-Dec. 20. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 1.20 arc seconds. Epoch = 1984 Sept.17.0 TT T = 1984 Sept.26.68786 +/- 0.00624 (m.e.) TT Peri. = 317.58362 +/- 0.00634 Node = 55.50263 +/- 0.00059 (2000.0) Inc. = 21.57153 +/- 0.00642 q = 1.3197552 +/- 0.0000837 AU e = 0.6658787 +/- 0.0003471 a = 3.9499281 +/- 0.0010409 AU n' = 0.12555103 +/- 0.00004963 P = 7.850 +/- 0.0031030 years (+/- 1.13 day) The predicted orbit for the 2000 return is as follows: T = 2000 June 21.13131 TT Epoch = 2000 June 25.0 TT Peri. = 317.75851 e = 0.6660064 Node = 55.36188 (2000.0) a = 3.9492214 AU Inc. = 21.60075 n'= 0.12558473 q = 1.3190146 AU P = 7.848 years The following residuals in seconds of arc are from the above orbital elements: 19/ 19/ 19/ 841118 688 (1.4+ 1.5-) 841121 675 (0.3- 2.2+) 841130 675 (0.2- 1.8-) 841118 688 0.3- 1.8- M 841127 688 (0.4- 5.1+) 841130 675 1.2- 1.2- M 841118 688 (2.0- 2.0-) 841127 688 1.1+ 0.5- M 841130 675 (2.3- 0.4-) 841121 675 (0.6+ 3.9+) 841127 688 (2.6+ 6.0-) 841218 801 0.0 0.6+ 841121 675 0.2+ 3.1+ M 841128 372 1.0+ 0.9+ 841220 707 0.5+ 0.8+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1997 May 3

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