OAA computing section circular NK 1314 137P/Shoemaker-Levy 2
The following improved orbital elements, by S. Nakano, are from 87 observations 1990 to 2001. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.64 arc second. See previous orbits in NK 547R and NK 721. Epoch = 2000 Jan. 17.0 TT T = 2000 Feb. 5.82388 +/- 0.00030 (m.e.) TT Peri. = 142.02031 +/- 0.00025 Node = 234.75360 +/- 0.00024 (2000.0) Inc. = 4.65703 +/- 0.00002 q = 1.8685744 +/- 0.0000008 AU e = 0.5797047 +/- 0.0000002 a = 4.4458603 +/- 0.0000006 AU n' = 0.10514058 +/- 0.00000002 P = 9.374 +/- 0.0000020 years T = 1990 Sept.25.37446 TT Epoch = 1990 Sept.26.0 TT Peri. = 140.06998 e = 0.5822712 Node = 235.99434 (2000.0) a = 4.4142415 AU Inc. = 4.63744 n'= 0.10627227 q = 1.8439559 AU P = 9.274 years The predicted orbit for the 2009 return is as follows: T = 2009 May 13.56728 TT Epoch = 2009 May 9.0 TT Peri. = 140.81140 e = 0.5745104 Node = 233.12115 (2000.0) a = 4.5013632 AU Inc. = 4.85367 n'= 0.10320197 q = 1.9152830 AU P = 9.550 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1990/ 990708 360 0.3- 0.2- 990723 402 0.5- 0.2- 900917 675 (0.5- 2.5-) 990708 360 0.4- 0.1- 990723 402 0.2- 0.3- 900917 675 0.7+ 2.0- 990708 627 0.8- 1.5+ 990724 402 1.1- 0.2+ 900920 675 (0.7+ 3.5-) 990708 627 1.2+ 0.9- 990724 402 0.2- 0.2- 901014 675 0.7- 1.3- 990708 627 0.4- 0.6+ 990724 402 0.8- 0.3- 901016 675 0.4- 0.7- 990708 627 0.9- 0.4- 990724 402 0.7- 0.1- 901025 675 0.2- 0.6+ 990709 627 1.1+ 1.0- 990912 695 1.4+ 0.1+ 901025 675 0.9- 0.2- 990709 627 1.1- 0.5+ 990912 695 1.7+ 0.0 901113 675 0.9+ 0.3+ 990709 627 0.6+ 0.2+ 990914 046 0.4- 0.6+ 901113 675 0.5+ 1.6- 990712 627 0.2+ 0.9+ 990914 046 0.2- 0.4+ 901115 675 0.8- 1.4+ 990712 159 0.1- 0.8- 990914 046 0.2- 0.8+ 901115 675 1.8+ 0.4- 990712 159 0.4+ 0.1+ 991104 360 0.4- 0.6+ 901207 688 0.9+ 0.8+ 990712 159 0.7+ 0.1+ 991104 360 0.4- 0.5+ 901207 688 0.8+ 0.7+ 990712 627 (1.0+ 2.1+) 991104 360 0.3- 0.4+ 901207 372 2.1- 0.2+ 990712 159 0.9+ 0.4+ 991113 695 0.5- 0.1- 901207 372(11.7- 1.1+) 990712 159 0.1+ 0.2- 991208 402 0.3+ 0.7- 901211 568 1.3- 0.5+ 990712 627 0.1+ 1.0+ 991208 402 1.1- 0.2- 901212 568 0.5- 0.5+ 990712 159 0.5+ 0.1+ 991208 402 0.3+ 0.6- 901215 801 0.3+ 0.7+ 990712 159 0.0 0.5+ 991208 360 0.2- 0.1+ 901215 801 0.5+ 0.5+ 990713 159 0.1+ 0.1- 991208 360 0.7- 0.1+ 901218 413 0.1- 0.8+ 990713 704 0.1+ 0.2- 991208 360 0.2- 0.3- 1991/ 990713 704 0.6+ 0.7+ 2000/ 910115 688 0.2- 0.5+ 990713 704 0.9+ 0.3+ 001229 867 0.0 0.3+ 910115 688 0.9+ 0.6+ 990713 704 0.1+ 0.5+ 001229 867 0.5- 0.3+ 1998/ 990713 704 0.6+ 0.8+ 001229 867 0.3- 0.4+ 980519 696 0.5- 0.3+ 990713 159 0.7- 0.3- 2001/ 980519 696 0.5- 0.7+ 990713 159 1.0- 0.0 010220 360 0.1- 0.3+ 980519 696 0.6- 0.3+ 990716 122 1.2+ 0.3+ 010220 360 0.2+ 0.4+ 980520 696 0.4- 0.1- 990716 122 0.0 0.3+ 010220 867 0.2- 0.5+ 980520 696 0.3+ 0.0 990716 122 0.5+ 0.1+ 010220 867 0.9+ 0.5+ 980520 696 0.4+ 0.1+ 990716 122 0.2+ 0.2+ 010220 867 0.9+ 0.3- 1999/ 990723 402 0.5- 0.5- 990708 360 0.3- 0.2- 990723 402 0.4- 0.4- ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2006 Apr. 8