OAA computing section circular NK 751 139P/Vaisala-Oterma

The following improved orbital elements, by S. Nakano, are from 88 observations 1939 - 1999. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.77 arc second. Epoch = 1998 Sept.24.0 TT T = 1998 Sept.28.82479 +/- 0.03108 (m.e.) TT Peri. = 165.55063 +/- 0.00558 Node = 242.46818 +/- 0.00044 (2000.0) Inc. = 2.33259 +/- 0.00022 q = 3.3815135 +/- 0.0000396 AU e = 0.2483360 +/- 0.0000082 a = 4.4987034 +/- 0.0000160 AU n' = 0.10329351 +/- 0.00000055 P = 9.542 +/- 0.0000510 years T = 1939 Dec. 30.91756 TT Epoch = 1940 Jan. 12.0 TT Peri. = 147.24758 e = 0.2490125 Node = 255.69791 (2000.0) a = 4.5139698 AU Inc. = 2.11047 n'= 0.10276994 q = 3.3899347 AU P = 9.590 years [ T = 1949 July 16.64246 TT Epoch = 1949 July 23.0 TT Peri. = 146.92542 e = 0.2474298 Node = 255.70064 (2000.0) a = 4.5081543 AU Inc. = 2.11314 n'= 0.10296886 q = 3.3927026 AU P = 9.572 years ] [ T = 1959 Mar. 3.97881 TT Epoch = 1959 Mar. 13.0 TT Peri. = 147.50814 e = 0.2465308 Node = 255.44504 (2000.0) a = 4.5312443 AU Inc. = 2.11362 n'= 0.10218281 q = 3.4141529 AU P = 9.646 years ] [ T = 1968 Oct. 22.38490 TT Epoch = 1968 Oct. 31.0 TT Peri. = 147.69804 e = 0.2472752 Node = 255.26213 (2000.0) a = 4.5192600 AU Inc. = 2.11743 n'= 0.10258954 q = 3.4017590 AU P = 9.607 years ] [ T = 1978 May 18.21049 TT Epoch = 1978 May 12.0 TT Peri. = 147.73902 e = 0.2482980 Node = 255.27202 (2000.0) a = 4.4983655 AU Inc. = 2.12263 n'= 0.10330515 q = 3.3814304 AU P = 9.541 years ] [ T = 1988 July 18.62047 TT Epoch = 1988 July 18.0 TT Peri. = 160.44888 e = 0.2217058 Node = 245.37766 (2000.0) a = 4.8358014 AU Inc. = 2.25845 n'= 0.09268328 q = 3.7636763 AU P = 10.634 years ] The predicted orbit for the 2008 return is as follows: T = 2008 Apr. 19.29326 TT Epoch = 2008 Apr. 4.0 TT Peri. = 165.51984 e = 0.2464988 Node = 242.45276 (2000.0) a = 4.5159407 AU Inc. = 2.32928 n'= 0.10270267 q = 3.4027667 AU P = 9.597 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1939/ 981208 867 0.0 0.0 981220 897 1.1+ 0.2- 391007 062 2.4- 1.2- 981208 108 (2.3- 2.5-) 981220 897 0.1+ 0.5+ 391018 062 1.6- 0.8- 981208 108 1.0- 1.0- 981220 897 0.1+ 0.5+ 391020 062 0.6+ 0.6+ 981208 108 0.6- 1.3- 981224 402 0.5+ 0.4+ 391111 062 3.2+ 2.1+ 981209 372 1.5+ 1.4+ 981224 402 1.8+ 0.5- 1998/ 981209 372 1.1+ 1.0+ 981224 402 0.5+ 0.1- 981118 704 0.2- 0.9- 981209 046 0.0 0.5+ 1999/ 981118 704 1.2- 0.4+ 981209 046 0.4+ 0.4+ 990105 372 0.7+ 0.5+ 981118 704 1.0- 0.6- 981209 046 0.2+ 0.0 990109 372 0.4- 1.9+ 981118 704 1.4- 1.5- 981209 046 0.1+ 0.3+ 990110 372 1.6- 0.3+ 981121 704 0.4+ 0.1- 981209 620 0.3+ 0.0 990113 360 0.1+ 0.2+ 981121 704 0.4- 0.1- 981209 620 0.3- 0.2- 990113 372 0.7- 1.2+ 981121 704 1.6- 0.5+ 981209 620 0.6- 0.5- 990113 360 0.2+ 0.1- 981124 704 0.5- 0.6- 981211 118 0.2+ 0.3- 990114 691 0.0 0.2- 981124 704 (0.5+ 3.2-) 981211 118 0.4+ 0.3+ 990114 691 0.1+ 0.6- 981124 704 (1.3- 4.6-) 981211 355 1.9- 0.6- 990114 691 0.2+ 0.6- 981124 704 (2.7- 4.7-) 981211 355 (2.2- 0.6-) 990120 504 0.7- 0.7- 981206 658 0.0 0.3+ 981212 367 (2.4+ 0.5+) 990120 504 1.0- 0.5- 981206 658 0.4+ 0.0 981212 367 1.5+ 0.0 990123 691 0.0 0.4- 981207 709 0.1- 0.3- 981212 402 0.2- 0.1- 990123 691 0.4+ 0.1+ 981207 709 0.0 0.2- 981212 402 0.3+ 0.2- 990123 691 0.1- 0.5- 981207 587 (2.6- 1.1-) 981212 402 0.5+ 0.2- 990209 691 0.7- 0.3- 981207 587 0.4+ 0.4+ 981214 691 0.3- 0.4- 990209 691 1.2- 0.4+ 981207 587 0.2+ 0.9+ 981214 691 0.2- 0.5- 990209 691 0.4- 0.1- 981207 046 1.3+ 1.4+ 981214 691 0.5+ 0.7- 990214 693 0.1- 0.9+ 981207 046 0.3- 0.7- 981214 504 1.5- 0.4+ 990214 693 0.0 0.9+ 981207 046 0.8+ 1.4- 981214 504 1.0- 0.2- 990214 693 0.3- 1.0+ 981208 691 0.2+ 0.3+ 981217 402 0.2+ 0.2- 990217 360 0.8+ 0.7+ 981208 691 0.3- 0.2- 981217 402 0.4+ 0.2+ 990217 360 1.7+ 0.4+ 981208 691 0.3+ 0.1- 981217 360 0.6+ 0.3+ 990217 360 0.7+ 0.5+ 981208 867 0.2- 0.2+ 981217 402 0.7+ 0.3+ 990316 691 0.6+ 1.3- 981208 867 0.2- 0.0 981217 360 0.2+ 0.1- 990316 691 0.6- 1.1- 981208 867 0.1+ 0.2+ 981217 360 0.3+ 0.0 ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2000 Dec. 20

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