OAA computing section circular NK 1122 161P/Hartley-IRAS (1983 V1 = 2004 V2)
The following improved orbital elements, by S. Nakano, are from 66 observations 1983 to 2004. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 1.35 arc seconds. Epoch = 2005 July 9.0 TT T = 2005 June 20.84219 +/- 0.00241 (m.e.) TT Peri. = 47.07575 +/- 0.00025 Node = 1.39965 +/- 0.00015 (2000.0) Inc. = 95.69709 +/- 0.00007 q = 1.2751361 +/- 0.0000020 AU e = 0.8350822 +/- 0.0000002 a = 7.7319518 +/- 0.0000021 AU n' = 0.04584272 +/- 0.00000002 P = 21.500 +/- 0.0000089 years T = 1984 Jan. 8.70570 TT Epoch = 1984 Jan. 21.0 TT Peri. = 47.11183 e = 0.8338319 Node = 1.50102 (2000.0) a = 7.7176434 AU Inc. = 95.73083 n'= 0.04597027 q = 1.2824261 AU P = 21.440 years The predicted orbit for the 2026 return is as follows: T = 2026 Nov. 27.50663 TT Epoch = 2026 Nov. 16.0 TT Peri. = 47.06879 e = 0.8361998 Node = 1.47720 (2000.0) a = 7.7237931 AU Inc. = 95.79119 n'= 0.04591537 q = 1.2651591 AU P = 21.466 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1983/ 840225 168 1.3- 2.1- 840405 491 0.1- 1.1- 831104 413 (2.1- 9.1+) 840226 168 1.8- 1.8- 840406 491 0.7+ 0.7- 831104 413 (3.3- 8.8+) 840226 168 1.9- 0.6+ 840406 168 2.4+ 0.7- 831123 413 (0.1- 4.9+) 840227 114 2.3- 0.4+ 840407 168 (3.4+ 3.9-) 831123 413 0.7+ 0.9+ 840301 168 (5.1+ 4.8+) 840408 675 (4.5- 11.6+) 831127 675 (0.7+ 3.6+) 840302 168 0.5- 1.3+ 840413 657 (2.9- 1.6+) 831128 675 (4.9+ 8.6-) 840302 372 2.0+ 0.2+ 840417 168 0.8- 1.4- 831130 688 (3.1+ 1.7+) 840303 168 1.8+ 0.9+ 840417 168 0.9- 1.5+ 831130 657 (4.6+ 8.9+) 840303 168 1.3+ 1.1+ 840418 168 2.5+ 0.3+ 831130 688 0.9+ 1.2+ 840304 168 1.2+ 2.4- 840418 168 (4.9+ 0.7+) 831201 657 1.0+ 0.2+ 840304 168 (1.2+ 5.3-) 840418 168 0.4+ 1.2+ 831201 801 1.3- 1.2+ 840304 168 0.0 1.5+ 840420 675 0.3- 1.8+ 831203 046 (1.4- 3.1+) 840304 372 1.8+ 0.1+ 840420 102 (4.3- 1.6+) 831203 046 (1.1- 3.5-) 840308 168 (5.0+ 2.7-) 840421 675 0.7+ 2.0+ 831204 657 (4.3+ 2.3+) 840309 168 0.2- 0.5+ 840422 168 (1.3+ 4.5+) 831204 046 0.9- 1.7+ 840311 675 1.2+ 1.9- 840423 168 (4.3+ 6.5+) 831204 046 (1.8+ 5.7-) 840321 102 (7.7+ 7.7-) 840425 657 1.5- 0.9- 831205 688 0.3+ 1.1- 840322 168 0.5- 2.3+ 840426 657 0.0 1.0- 831205 688 1.2+ 1.3- 840327 114 0.7- 1.7+ 840427 657 (6.5- 0.4-) 831207 046 0.4- 0.9+ 840327 114 (1.5- 3.3+) 840428 801 (0.7- 2.8-) 831207 046 2.1+ 0.1+ 840328 136 (0.5- 4.9-) 840503 168 1.3+ 1.5- 831208 707 1.0+ 1.6+ 840328 801 1.7+ 2.4- 840525 095 (4.4- 2.6+) 831208 413 (3.6- 1.9+) 840328 381 2.3+ 0.5- 840528 095 0.0 1.2- 831208 413 (4.0+ 2.9-) 840329 168 2.5- 2.5- 840604 801 (3.1- 1.4+) 831208 801 1.3- 0.7+ 840329 168 1.8- 0.3+ 2004/ 831225 984 1.5+ 2.3+ 840329 168 (0.7- 3.7-) 041103 413 0.3- 0.9- 831229 688 0.7- 1.9- 840329 114 2.0- 0.9+ 041103 413 0.4- 1.2- 831229 688 2.4+ 0.5- 840330 657 2.3+ 2.2- 041103 413 0.3- 0.8- 1984/ 840331 114 1.9+ 0.2+ 041105 474 0.1- 0.7- 840101 801 0.2- 0.7- 840401 136 (1.1- 7.5+) 041105 474 0.2- 1.3- 840104 502 (2.4+ 4.1-) 840401 136 2.5- 0.2+ 041105 474 0.4- 1.2- 840107 801 1.7- 1.5- 840401 136 1.8- 0.6+ 041105 474 0.6- 0.4+ 840109 801 2.1- 1.9- 840402 657 2.0- 1.5- 041105 413 0.6- 0.5- 840211 675 0.3+ 2.0- 840402 114 0.1- 1.0+ 840225 168 1.2- 1.1- 840403 114 (3.4- 2.6+) ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2004 Nov. 7