OAA computing section circular NK 665 41P/Tuttle-Giacobini-Kresak

The following improved orbital elements, by S. Nakano, are from 42 observations 1978-1995, including planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effect of style II. The mean residual is +/- 1.19 arc seconds. Epoch = 1995 July 22.0 TT T = 1995 July 28.79953 +/- 0.00045 (m.e.) TT Peri. = 61.67992 +/- 0.00100 Node = 141.49721 +/- 0.00062 (2000.0) Inc. = 9.22521 +/- 0.00009 q = 1.0653158 +/- 0.0000061 AU e = 0.6563707 +/- 0.0000013 a = 3.1001889 +/- 0.0000069 AU n' = 0.18056012 +/- 0.00000060 P = 5.459 +/- 0.0000182 years A1 = +0.922 +/- 0.173 A2 = +0.05442 +/- 0.00122 T = 1978 Dec. 25.80881 TT Epoch = 1979 Jan. 7.0 TT Peri. = 49.38290 e = 0.6429007 Node = 154.01971 (2000.0) a = 3.1470695 AU Inc. = 9.93684 n'= 0.17654059 q = 1.1238164 AU P = 5.583 years [ T = 1984 July 28.54430 TT Epoch = 1984 Aug. 8.0 TT Peri. = 49.51715 e = 0.6430008 Node = 153.94958 (2000.0) a = 3.1469183 AU Inc. = 9.93268 n'= 0.17655331 q = 1.1234473 AU P = 5.582 years ] T = 1990 Feb. 8.19514 TT Epoch = 1990 Jan. 29.0 TT Peri. = 61.58975 e = 0.6557052 Node = 141.55301 (2000.0) a = 3.1022631 AU Inc. = 9.22492 n'= 0.18037906 q = 1.0680929 AU P = 5.464 years The predicted orbit for the 2001 return is as follows: T = 2001 Jan. 6.98474 TT Epoch = 2001 Jan. 11.0 TT Peri. = 62.18015 e = 0.6592848 Node = 141.10378 (2000.0) a = 3.0883590 AU Inc. = 9.22566 n'= 0.18159856 q = 1.0522508 AU P = 5.427 years The following residuals in seconds of arc are from the above orbital elements: 1978/ 950128 691 0.3- 0.3+ 950818 367 0.4+ 1.2- 781108 372 0.9- 3.0- Y 950128 691 0.3- 0.1- 950823 422 0.3+ 1.1- 781211 372 0.6+ 1.8+ Y 950128 691 0.1- 0.4- 950823 422 0.3+ 0.2- 781211 372 0.6- 2.9- Y 950129 691 1.7+ 0.7+ 950825 422 0.1+ 0.5- 1979/ 950129 691 (3.0+ 0.9+) 950825 422 0.4+ 0.9- 790104 372 (8.1+ 0.4+)Y 950129 691 2.2+ 1.3+ 950826 422 0.5+ 0.7- 790107 372 (2.7+ 4.6-)Y 950523 360 1.0- 0.8- 950826 422 0.0 1.1+ 1989/ 950523 360 (3.2- 0.1-) 950826 587 (2.5+ 0.5+) 891109 675 0.3- 1.8+ 950523 360 0.9- 0.8+ 950826 587 1.9+ 0.7+ 891109 675 0.6- 2.0+ 950620 360 2.1- 1.0- 950907 413 0.2+ 1.4+ 891109 675 0.1- 2.2+ 950620 360 0.9- 0.8- 950907 413 0.0 0.5+ 891110 675 0.8+ 0.9+ 950620 360 1.3- 1.6- 950908 367 0.1- 0.5+ 891110 675 0.3- 1.7+ 950818 367 1.6+ 0.4- 950908 367 0.3+ 0.3+ 891110 675 0.3- 0.9+ 950818 367 0.7- 0.1- 950912 413 0.4+ 1.8+ 1990/ 950818 367 0.3- 0.5+ 950912 413 0.1- 2.0+ 900125 897 (5.0+ 0.1-) 950818 367 0.4+ 0.5+ 951006 897 (4.2- 3.5+) 900125 897 2.2+ 0.2- 950818 367 0.4+ 0.3+ 951029 413 2.1- 3.0+ 1995/ 950818 367 0.9+ 0.8- 951029 413 1.5- 2.9+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1998 Apr. 26

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