OAA computing section circular NK 657 P/1991 T1 (Shoemaker-Levy 5)

The following improved orbital elements, by S. Nakano, are from 33 observations 1991 Sept. 12-1992 Jan. 2. Perturbations by Mercury to Neptune and five minor planets, Ceres, Pallas, Vesta, Iris and Bamberga, were taken into account. The mean residual is /- 0.86 arc second. Epoch = 1991 Dec. 10.0 TT T = 1991 Dec. 13.22412 +/- 0.00706 (m.e.) TT Peri. = 6.04406 +/- 0.00862 Node = 29.66587 +/- 0.00847 (2000.0) Inc. = 11.76524 +/- 0.00117 q = 1.9848969 +/- 0.0002375 AU e = 0.5298093 +/- 0.0000388 a = 4.2214724 +/- 0.0003659 AU n' = 0.11363396 +/- 0.00001478 P = 8.674 +/- 0.0011277 years (+/- 0.41 day) The predicted orbit for the 2000 return is as follows: T = 2000 Aug. 18.55296 TT Epoch = 2000 Aug. 4.0 TT Peri. = 6.24638 e = 0.5295064 Node = 29.69054 (2000.0) a = 4.2265672 AU Inc. = 11.77084 n'= 0.11342856 q = 1.9885730 AU P = 8.689 years The following residuals in seconds of arc are from the above orbital elements: 19/ 19/ 19/ 910912 675 0.5- 0.4- 911011 801 1.5+ 0.3+ 911105 801 0.0 0.4+ 910917 675 0.5+ 0.3- 911011 801 0.3- 0.4- 911105 801 0.9+ 0.3+ 910917 675 0.7+ 0.0 911011 675 0.7+ 0.0 911107 675 0.5+ 0.2+ 911002 675 0.1- 0.4- 911011 675 0.6- 0.6+ 911107 675 1.6+ 0.1- 911003 675 1.2- 0.1+ 911011 657 1.6+ 0.5+ 911125 372 1.7- 0.3+ 911004 675 1.5- 2.0- 911011 657 (2.8+ 0.1+) 911201 675 1.4- 0.7+ 911005 801 0.1+ 0.3- 911014 691 0.4- 1.1+ 911201 675 0.3+ 1.8- 911005 801 0.8+ 0.2- 911014 691 0.5- 1.1+ 911203 675 (0.0 3.5+) 911005 413 0.3- 0.8+ 911014 691 0.8- 1.2+ 911203 675 0.3- 1.2- 911007 675 (0.1- 3.6-) 911014 675 1.3- 0.8- 920102 691 0.7- 0.3+ 911008 801 0.6+ 0.1+ 911014 675 0.5- 0.7+ 920102 691 0.1- 0.1+ 911008 801 0.1+ 0.6+ 911017 372 (2.6+ 0.2-) 920102 691 1.9+ 0.0 911008 675 0.6+ 1.7- 911101 372 (0.1+ 2.9-) ( ) -------- Rejected Obs.

Director, Computing Section Computed date Syuichi Nakano 1992 Dec. 11

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