OAA computing section circular NK 1195 139P/Vaisala-Oterma
The following improved orbital elements, by S. Nakano, are from 94 observations 1939 to 1999. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.76 arc second. See a previous orbit in NK 751. Epoch = 1998 Sept.24.0 TT T = 1998 Sept.28.82353 +/- 0.02969 (m.e.) TT Peri. = 165.55039 +/- 0.00535 Node = 242.46818 +/- 0.00042 (2000.0) Inc. = 2.33258 +/- 0.00021 q = 3.3815107 +/- 0.0000382 AU e = 0.2483358 +/- 0.0000079 a = 4.4986988 +/- 0.0000154 AU n' = 0.10329367 +/- 0.00000053 P = 9.542 +/- 0.0000490 years T = 1939 Dec. 30.91544 TT Epoch = 1940 Jan. 12.0 TT Peri. = 147.24672 e = 0.2490119 Node = 255.69839 (2000.0) a = 4.5139689 AU Inc. = 2.11046 n'= 0.10276997 q = 3.3899370 AU P = 9.590 years [ T = 1949 July 16.63916 TT Epoch = 1949 July 23.0 TT Peri. = 146.92455 e = 0.2474292 Node = 255.70111 (2000.0) a = 4.5081533 AU Inc. = 2.11313 n'= 0.10296890 q = 3.3927047 AU P = 9.572 years ] [ T = 1959 Mar. 3.97429 TT Epoch = 1959 Mar. 13.0 TT Peri. = 147.50728 e = 0.2465302 Node = 255.44551 (2000.0) a = 4.5312433 AU Inc. = 2.11361 n'= 0.10218285 q = 3.4141550 AU P = 9.646 years ] [ T = 1968 Oct. 22.37918 TT Epoch = 1968 Oct. 31.0 TT Peri. = 147.69717 e = 0.2472746 Node = 255.26261 (2000.0) a = 4.5192589 AU Inc. = 2.11741 n'= 0.10258958 q = 3.4017612 AU P = 9.607 years ] [ T = 1978 May 18.20357 TT Epoch = 1978 May 12.0 TT Peri. = 147.73816 e = 0.2482974 Node = 255.27250 (2000.0) a = 4.4983646 AU Inc. = 2.12262 n'= 0.10330518 q = 3.3814325 AU P = 9.541 years ] [ T = 1988 July 18.61641 TT Epoch = 1988 July 18.0 TT Peri. = 160.44840 e = 0.2217046 Node = 245.37776 (2000.0) a = 4.8358071 AU Inc. = 2.25844 n'= 0.09268311 q = 3.7636863 AU P = 10.634 years ] The predicted orbit for the 2008 return is as follows: T = 2008 Apr. 19.28657 TT Epoch = 2008 Apr. 4.0 TT Peri. = 165.51960 e = 0.2464987 Node = 242.45276 (2000.0) a = 4.5159360 AU Inc. = 2.32928 n'= 0.10270283 q = 3.4027639 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 691 0.3+ 0.1- 981217 360 0.2+ 0.1- 391007 062 2.4- 1.2- 981208 867 0.2- 0.2+ 981217 360 0.3+ 0.0 391018 062 1.6- 0.9- 981208 867 0.2- 0.0 981220 897 1.1+ 0.2- 391020 062 0.6+ 0.6+ 981208 867 0.2+ 0.3+ 981220 897 0.1+ 0.5+ 391111 062 3.2+ 2.1+ 981208 867 0.0 0.0 981220 897 0.1+ 0.5+ 1998/ 981208 108 (2.3- 2.5-) 981224 402 0.5+ 0.4+ 981118 704 0.2- 0.9- 981208 108 1.0- 1.0- 981224 402 1.8+ 0.5- 981118 704 1.2- 0.4+ 981208 108 0.6- 1.3- 981224 402 0.5+ 0.1- 981118 704 1.0- 0.6- 981209 372 1.5+ 1.4+ 1999/ 981118 704 1.4- 1.5- 981209 372 1.1+ 1.0+ 990105 372 0.7+ 0.5+ 981121 704 0.4+ 0.1- 981209 046 0.0 0.5+ 990109 372 0.4- 1.9+ 981121 704 0.4- 0.1- 981209 046 0.4+ 0.4+ 990110 372 1.6- 0.3+ 981121 704 1.6- 0.5+ 981209 046 0.2+ 0.0 990113 360 0.1+ 0.2+ 981124 704 0.5- 0.5- 981209 046 0.1+ 0.3+ 990113 372 0.7- 1.2+ 981124 704 (0.5+ 3.2-) 981209 620 0.3+ 0.0 990113 360 0.2+ 0.1- 981124 704 (1.3- 4.6-) 981209 620 0.3- 0.2- 990114 691 0.0 0.2- 981124 704 (2.7- 4.7-) 981209 620 0.6- 0.5- 990114 691 0.1+ 0.6- 981125 699 0.3+ 0.5+ 981211 118 0.2+ 0.3- 990114 691 0.2+ 0.6- 981125 699 0.3- 0.2+ 981211 118 0.4+ 0.3+ 990120 504 0.7- 0.7- 981125 699 0.4+ 0.2+ 981211 355 1.9- 0.6- 990120 504 1.0- 0.5- 981206 658 0.0 0.3+ 981211 355 (2.2- 0.6-) 990123 691 0.0 0.4- 981206 658 0.4+ 0.0 981212 367 (2.4+ 0.5+) 990123 691 0.4+ 0.1+ 981207 709 0.1- 0.3- 981212 367 1.5+ 0.0 990123 691 0.1- 0.5- 981207 709 0.0 0.2- 981212 402 0.2- 0.1- 990209 691 0.7- 0.3- 981207 587 (2.6- 1.1-) 981212 402 0.4+ 0.2- 990209 691 1.2- 0.4+ 981207 587 0.4+ 0.4+ 981212 402 0.5+ 0.2- 990209 691 0.4- 0.1- 981207 587 0.2+ 0.9+ 981214 691 0.3- 0.4- 990214 693 0.1- 0.9+ 981207 046 1.3+ 1.4+ 981214 691 0.2- 0.5- 990214 693 0.0 0.9+ 981207 046 0.3- 0.7- 981214 691 0.5+ 0.7- 990214 693 0.3- 1.0+ 981207 046 0.8+ 1.4- 981214 504 1.5- 0.4+ 990217 360 0.8+ 0.7+ 981208 699 0.7- 0.5- 981214 504 1.0- 0.2- 990217 360 1.7+ 0.4+ 981208 691 0.3+ 0.3+ 981217 402 0.2+ 0.2- 990217 360 0.7+ 0.5+ 981208 699 0.9+ 0.5- 981217 402 0.4+ 0.2+ 990316 691 0.6+ 1.3- 981208 691 0.3- 0.2- 981217 360 0.6+ 0.3+ 990316 691 0.6- 1.1- 981208 699 1.1- 0.1- 981217 402 0.7+ 0.3+ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2005 July 4