OAA computing section circular NK 1312 145P/Shoemaker-Levy 5

The following improved orbital elements, by S. Nakano, are from 123 observations 1991 to 2001. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.72 arc second. See a previous orbit in NK 657. Epoch = 2000 Aug. 4.0 TT T = 2000 Aug. 17.10007 +/- 0.00059 (m.e.) TT Peri. = 6.23890 +/- 0.00027 Node = 29.69021 +/- 0.00008 (2000.0) Inc. = 11.77051 +/- 0.00002 q = 1.9885819 +/- 0.0000034 AU e = 0.5293704 +/- 0.0000008 a = 4.2253648 +/- 0.0000024 AU n' = 0.11347698 +/- 0.00000010 P = 8.686 +/- 0.0000075 years T = 1991 Dec. 13.20691 TT Epoch = 1991 Dec. 10.0 TT Peri. = 6.03733 e = 0.5296735 Node = 29.66552 (2000.0) a = 4.2201892 AU Inc. = 11.76498 n'= 0.11368579 q = 1.9848667 AU P = 8.670 years The predicted orbit for the 2009 return is as follows: T = 2009 Mar. 26.61074 TT Epoch = 2009 Mar. 30.0 TT Peri. = 10.13927 e = 0.5421054 Node = 26.90322 (2000.0) a = 4.1305272 AU Inc. = 11.29938 n'= 0.11740750 q = 1.8913462 AU P = 8.395 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1991/ 000906 704 1.2- 1.1+ 001106 704 0.8+ 0.1- 910912 675 2.1- 0.1- 000906 704 0.7- 0.6+ 001106 704 1.2+ 0.7- 910917 675 0.8- 0.2- 000906 704 1.0- 0.4+ 001106 704 1.3+ 0.3+ 910917 675 0.5- 0.2+ 000906 704 1.9- 0.6+ 001106 704 0.7- 0.7+ 911002 675 0.3- 0.5- 000906 704 0.7- 1.4+ 001106 402 0.9+ 0.9- 911003 675 1.4- 0.0 000907 658 0.3+ 0.7+ 001106 402 0.4+ 0.4- 911004 675 1.6- 2.1- 000907 658 0.2- 0.5+ 001106 402 0.1+ 0.3- 911005 801 0.1+ 0.4- 000907 658 0.0 0.6+ 001118 360 0.4+ 0.1+ 911005 801 0.8+ 0.4- 000907 372 1.0- 0.3+ 001118 360 0.0 0.1- 911005 413 0.3- 0.6+ 000907 372 1.6- 0.3+ 001119 704 0.1- 0.4- 911007 675 (0.0 3.7-) 000909 046 0.4+ 0.7+ 001119 704 0.0 0.6- 911008 801 0.8+ 0.1- 000909 046 0.4+ 0.6+ 001119 704 0.4- 0.6- 911008 801 0.3+ 0.4+ 000909 046 0.2+ 0.8+ 001119 704 0.5- 0.5- 911008 675 0.8+ 1.9- 000909 046 0.3+ 0.4+ 001119 704 (2.3- 0.3-) 911011 801 1.8+ 0.0 000912 046 0.1- 0.8+ 001123 900 1.3+ 0.5+ 911011 801 0.1+ 0.7- 000912 046 0.1- 0.5+ 001123 900 0.6+ 0.4- 911011 675 1.1+ 0.3- 000912 046 0.2+ 0.4+ 001125 402 0.2+ 0.8- 911011 675 0.3- 0.3+ 000912 046 0.0 0.5+ 001125 402 0.4+ 0.6- 911011 657 1.9+ 0.3+ 000926 360 0.5+ 0.1+ 001128 360 0.7+ 0.0 911011 657 (3.1+ 0.2-) 000926 360 0.5+ 0.2+ 001128 360 0.5+ 0.1+ 911014 691 0.1+ 0.8+ 000927 704 1.5- 0.0 001204 704 0.6- 0.6- 911014 691 0.0 0.8+ 000927 704 0.4- 0.5- 001204 704 0.1+ 0.9- 911014 691 0.3- 0.9+ 000927 704 0.5+ 0.4- 001204 704 0.5- 0.1+ 911014 675 0.8- 1.2- 000927 704 1.2- 0.3+ 001204 704 0.3+ 0.4- 911014 675 0.0 0.4+ 000927 704 1.5- 1.2+ 001204 704 0.7- 0.5- 911017 372 (3.3+ 0.6-) 000929 118 0.0 1.1+ 001206 704 0.5- 0.1- 911101 372 (1.1+ 3.6-) 000929 118 0.1+ 0.6+ 001206 704 0.0 0.6- 911105 801 1.0+ 0.3- 000929 349 0.5- 0.2+ 001206 704 0.3+ 0.0 911105 801 1.9+ 0.5- 000929 349 1.4- 0.2+ 001206 704 0.4- 0.1- 911107 675 1.5+ 0.6- 000929 349 1.2- 0.5+ 001206 704 0.4- 0.5+ 911107 675 (2.6+ 0.9-) 001007 349 0.4+ 1.3+ 001208 349 0.2- 0.1- 911125 372 0.9- 0.5- 001007 349 0.4- 0.1+ 001208 349 0.8- 0.4- 911201 675 0.8- 0.0 001007 349 0.6- 0.0 001208 349 0.1- 0.0 911201 675 (1.0+ 2.5-) 001022 118 0.1+ 0.4+ 001208 349 0.5- 0.2+ 911203 675 (0.7+ 2.8+) 001022 118 0.0 0.4+ 001217 941 0.7- 0.4- 911203 675 0.4+ 1.9- 001025 704 (2.6+ 0.3-) 001217 941 (2.2- 1.7-) 1992/ 001025 704 1.4+ 0.4- 001219 704 1.6+ 0.6- 920102 691 0.9+ 0.3+ 001025 704 0.0 0.4- 001219 704 0.3+ 0.8+ 920102 691 1.5+ 0.1+ 001025 704 0.7+ 0.1- 001219 704 0.6- 0.2+ 920102 691 (3.6+ 0.0 ) 001026 402 0.3- 0.5+ 001219 704 0.1- 0.0 2000/ 001026 402 0.5- 0.1+ 001219 704 0.6- 0.3- 000701 372 (1.5+ 3.3+) 001026 402 0.0 0.1+ 001223 349 0.5+ 0.1- 000711 372 (2.9+ 3.2+) 001027 900 1.3+ 0.7+ 001223 349 0.6- 0.5+ 000803 372 0.3+ 0.7+ 001027 900 1.6+ 0.2- 001223 349 0.8- 0.1+ 000810 372 0.6+ 1.6+ 001103 360 0.5+ 0.1+ 2001/ 000904 372 (0.7+ 3.4-) 001103 360 0.4+ 0.1+ 010216 587 0.4+ 0.0 000904 372 1.3- 0.7- 001106 704 0.3+ 0.9- 010216 587 0.0 0.1- ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2006 Apr. 8

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