OAA computing section circular NK 1048 135P/Shoemaker-Levy 8
The following improved orbital elements, by S. Nakano, are from 94 observations 1992 to 1999. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.91 arc second. See a previous orbit in NK 643. Epoch = 1999 Dec. 8.0 TT T = 1999 Dec. 10.51618 +/- 0.00124 (m.e.) TT Peri. = 22.58766 +/- 0.00027 Node = 213.31730 +/- 0.00020 (2000.0) Inc. = 6.05041 +/- 0.00004 q = 2.7211902 +/- 0.0000022 AU e = 0.2894582 +/- 0.0000005 a = 3.8297397 +/- 0.0000010 AU n' = 0.13150740 +/- 0.00000005 P = 7.495 +/- 0.0000031 years T = 1992 June 13.51519 TT Epoch = 1992 June 27.0 TT Peri. = 22.40618 e = 0.2907131 Node = 213.39591 (2000.0) a = 3.8216123 AU Inc. = 6.05337 n'= 0.13192714 q = 2.7106196 AU P = 7.471 years The predicted orbit for the 2007 return is as follows: T = 2007 May 30.99521 TT Epoch = 2007 May 20.0 TT Peri. = 22.31706 e = 0.2910939 Node = 213.29765 (2000.0) a = 3.8245531 AU Inc. = 6.05407 n'= 0.13177500 q = 2.7112489 AU P = 7.479 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1992/ 920527 675 (3.2+ 0.7+) 930725 691 0.5+ 0.2+ 920330 413 1.6+ 1.1- 920529 801 0.9+ 0.8+ 930725 691 0.8+ 0.4+ 920405 675 0.2- 0.4+ 920529 801 1.4+ 0.6+ 930815 691 0.2+ 0.3- 920407 675 0.3+ 1.3- 920531 675 1.5- 1.3- 930815 691 0.1+ 0.4- 920407 675 0.1- 0.9- 920531 675 2.0- 0.4- 930916 691 0.3- 0.7- 920408 675 0.1+ 0.4- 920603 801 1.2+ 0.5+ 930916 691 0.5- 0.6- 920408 675 0.1+ 0.1+ 920603 801 0.5+ 0.7+ 930916 691 0.6- 0.7- 920408 675 (3.3- 0.7-) 920603 675 0.9+ 0.5+ 1998/ 920411 372 0.4+ 1.6- 920603 675 0.2- 1.8- 980122 696 (2.3- 0.6+) 920411 372 0.3+ 1.7- 920605 675 (2.7+ 2.2-) 980122 696 0.9- 0.2+ 920413 372 0.7+ 0.5- 920625 675 0.2- 0.2- 980122 696 0.4- 0.4- 920422 372 0.6- 0.4- 920625 675 1.0- 0.6- 980128 693 0.6+ 0.7- 920422 372 0.4- 0.6- 920628 675 0.5+ 0.7- 980128 693 0.5+ 0.0 920423 376 0.7+ 2.3+ 920628 675 1.0+ 1.2- 1999/ 920423 376 1.1- 1.0+ 920629 801 0.4+ 0.6+ 990113 693 1.2- 1.5+ 920423 413 0.7+ 0.4- 920629 801 0.2+ 0.4- 990113 693 0.5+ 0.6+ 920423 413 0.7+ 0.3- 920702 801 1.9+ 0.6+ 990212 693 0.9- 0.9+ 920423 413 0.9+ 0.5- 920702 801 1.5- 1.1+ 990212 693 1.0- 0.9+ 920426 675 0.6- 1.6- 920704 413 1.1- 0.7+ 990320 704 0.6- 1.3- 920426 675 0.1- 1.5- 920704 413 1.4- 1.3+ 990320 704 (2.8- 2.0-) 920428 376 1.2+ 0.3- 920820 413 1.9- 0.2+ 990320 704 0.4- 0.3- 920428 376 0.2- 0.5- 920820 413 1.4- 0.1- 990320 704 0.9- 1.9- 920428 376 1.0+ 1.0- 920821 413 (2.8- 0.4+) 990320 704 0.7+ 0.9+ 920429 675 0.9- 1.7- 920821 413 (2.6- 0.4+) 990323 704 0.7- 0.5- 920430 411 0.7- 1.4+ 920905 413 (3.5+ 0.1+) 990323 704 0.6+ 0.4+ 920430 411 2.2- 0.9+ 920905 413 (2.8- 0.9+) 990323 704 (4.6- 0.5+) 920501 675 0.6- 1.0+ 920905 413 (5.5- 0.8+) 990323 704 0.0 0.5- 920501 675 1.8+ 2.2- 921006 413 (2.6- 0.3+) 990323 704 (4.6- 1.1-) 920501 411 (1.9- 3.2+) 921006 413 (2.8- 0.5+) 990407 360 0.0 1.0+ 920502 372 1.3- 1.5+ 921012 413 (3.5- 0.4+) 990407 360 0.3+ 1.1+ 920506 801 0.3- 0.2+ 921012 413 (3.3- 0.4+) 990412 693 0.2- 0.5+ 920506 801 0.5- 0.5+ 1993/ 990412 693 0.1- 0.7+ 920509 413 0.2+ 0.7+ 930530 691 0.8- 0.2- 990412 693 0.2- 0.5+ 920509 413 0.2+ 0.5+ 930530 691 0.1+ 0.3+ 990506 360 1.6+ 0.2- 920524 413 0.6+ 0.6+ 930530 691 1.1- 0.2+ 990506 360 2.0+ 0.2- 920524 413 0.5+ 0.7+ 930721 691 0.2+ 0.7+ 990609 360 1.6+ 0.9+ 920524 372 0.9- 0.3- 930721 691 0.5+ 1.2+ 990609 360 1.3+ 1.2+ 920525 372 0.7- 2.2+ 930721 691 0.0 0.8+ 920527 675 1.0+ 0.1+ 930725 691 0.5+ 0.7+ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2004 Apr. 6