OAA computing section circular NK 616 Periodic Comet Hartley 2 (103P)
The following improved orbital elements, by S. Nakano, are from 149 observations 1986 to 1992. Perturbations by Mercury to Pluto and five minor planets, Ceres, Pallas, Vesta, Iris, Bamberga, were taken into account. The mean residual is +/- 0.93 arc second. See same orbit on MPC 23484. Epoch = 1991 Sept.21.0 TT T = 1991 Sept.11.65173 +/- 0.00005 (m.e.) TT Peri. = 174.89684 +/- 0.00020 Node = 226.78452 +/- 0.00019 (2000.0) Inc. = 9.25183 +/- 0.00003 q = 0.9533118 +/- 0.0000006 AU e = 0.7194841 +/- 0.0000002 a = 3.3984233 +/- 0.0000005 AU n' = 0.15732143 +/- 0.00000003 P = 6.265 +/- 0.0000014 years T = 1985 June 4.87821 TT Epoch = 1985 June 24.0 TT Peri. = 174.81210 e = 0.7198334 Node = 226.85401 (2000.0) a = 3.3966722 AU Inc. = 9.25280 n'= 0.15744309 q = 0.9516340 AU P = 6.260 years The predicted orbit for the 1997 return is as follows: T = 1997 Dec. 21.94036 TT Epoch = 1997 Dec. 18.0 TT Peri. = 180.72297 e = 0.7003595 Node = 219.95430 (2000.0) a = 3.4433206 AU Inc. = 13.61974 n'= 0.15425452 q = 1.0317582 AU P = 6.389 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 860315 413 1.0+ 1.6- 910818 589 (1.4- 3.7+) 911109 900 0.6+ 1.7+ 860317 413 1.8+ 1.3- 910819 589 (4.1+ 2.3+) 911110 411 0.0 0.8+ 860320 413 1.3- 1.6- 910819 589 (3.3+ 1.9+) 911110 411 0.8- 0.7- 860404 801 (5.1- 3.6-) 910819 589 (2.8+ 1.4+) 911110 411 0.3- 0.3- 860405 801 0.7+ 1.1- 910819 589 1.9+ 0.7+ 911110 411 0.8+ 0.4- 860405 675 2.1- 0.7- 910819 589 1.4+ 0.5+ 911120 411 0.1- 0.1+ 860405 675 2.3- 0.3- 910819 589 0.5+ 0.1+ 911120 411 0.5- 0.0 860405 675 2.0- 0.6- 910819 589 0.0 0.6- 911120 411 0.4- 1.0- 860408 675 1.6- 0.1- 910819 589 0.7- 1.1- 911120 411 0.7- 0.8+ 860408 675 1.7- 0.1+ 910820 568 0.5+ 0.5+ 911120 411 0.1+ 0.8- 860408 675 1.5- 0.0 910905 657 0.2+ 0.1- 911120 411 0.9- 0.8+ 860510 691 0.9+ 0.9- 910905 657 0.4+ 0.3- 911120 411 0.9- 0.7- 860510 691 1.0+ 0.5- 910906 046 1.8- 1.1- 911206 411 1.6- 0.9+ 860510 691 1.3+ 0.3- 910906 046 1.8- 0.7+ 911206 411 2.3- 0.6+ 860512 801 (3.0- 3.8+) 910908 503 1.4+ 0.6- 911206 411 1.4- 0.3+ 860607 691 1.6+ 0.8- 910908 801 0.6+ 0.3- 911206 411 1.5- 0.5+ 860607 691 1.4+ 1.5- 910908 801 0.6+ 0.3- 911206 411 (2.8- 0.1-) 860607 691 1.5+ 1.6- 910909 801 0.1- 0.1- 911212 897 1.0+ 0.2+ 910712 801 0.0 0.0 910909 801 0.0 0.2+ 911212 897 0.9- 1.3+ 910712 801 0.3- 0.0 910909 897 (3.8- 2.3+) 911216 897 1.9- 0.6+ 910712 801 1.0- 0.1+ 910909 897 (4.0- 1.0+) 911216 897 1.9- 0.2- 910712 801 1.1- 0.0 910909 897 (2.8- 0.6+) 911219 411 0.5+ 1.4- 910712 474 1.4- 0.9- 910910 046 0.6- 0.5- 911219 411 1.0+ 1.0+ 910712 474 1.4- 0.9- 910910 046 0.1- 0.4- 911219 411 0.5- 1.2+ 910712 474 0.4+ 0.0 910910 046 0.7- 1.5- 911219 411 1.4+ 0.2- 910712 474 0.4+ 0.0 910910 046 0.8+ 1.3- 911219 411 1.0- 0.3- 910713 801 0.4- 0.1- 910911 372 0.9- 0.4+ 911219 411 0.0 0.7+ 910713 801 0.7- 0.1- 910911 372 1.3+ 0.4- 911230 411 0.7+ 0.3+ 910713 801 0.6- 0.2- 910912 801 0.4+ 0.3- 911230 411 0.1+ 0.6- 910714 372 0.5+ 1.0+ 910912 801 0.5+ 0.3- 911230 411 1.7+ 1.7+ 910714 372 0.6- 0.4+ 910913 801 0.6+ 0.3- 911230 411 1.5+ 0.5+ 910714 372 1.5+ 1.3+ 910919 978 0.5- 1.2- 911230 411 0.7+ 0.5+ 910715 801 0.1- 0.3+ 910919 978 0.7- 1.5- 911230 411 0.9+ 1.9+ 910715 801 0.1- 0.3+ 910919 900 0.6+ 1.3+ 911230 411 0.1- 1.0+ 910716 801 0.3- 0.1- 910919 900 1.7- 0.7- 920101 801 1.9+ 0.7+ 910716 801 0.2- 0.3+ 910920 503 (2.9- 1.7-) 920101 801 (4.9+ 2.0-) 910723 657 0.6+ 0.6- 911002 411 0.8- 0.8+ 920104 411 0.7- 0.9+ 910723 657 0.0 0.7- 911002 411 1.9- 0.9+ 920104 411 0.0 0.4+ 910802 372 2.1- 0.0 911007 293 0.9+ 0.4- 920104 411 1.1- 2.1+ 910806 801 0.1- 0.7- 911007 293 1.1+ 0.2- 920104 411 0.1- 0.1- 910806 657 1.0+ 0.6- 911007 801 0.5+ 0.1- 920104 411 0.2- 0.3+ 910806 657 0.4+ 0.5- 911007 801 0.6+ 0.3+ 920107 801 0.2+ 0.6+ 910807 801 0.3+ 0.5- 911008 801 0.5+ 0.6- 920107 801 0.0 0.7+ 910811 098 1.2+ 1.6+ 911015 095 1.9- 0.1- 920108 801 0.3+ 1.0+ 910811 098 (5.3- 0.4+) 911019 095 (3.6- 2.4+) 920108 801 0.3+ 0.9+ 910812 098 0.8- 1.0+ 911103 801 0.5+ 0.5- 920205 801 0.3+ 0.0 910812 098 1.1- 1.3- 911103 801 0.4+ 0.3- 920205 801 0.4+ 0.7- 910812 801 0.2+ 0.3- 911104 411 1.3- 1.1+ 920207 801 0.1+ 0.8- 910814 657 0.4+ 0.2- 911104 897 1.1+ 1.0- 920207 801 1.4- 2.0- 910814 657 0.5+ 0.0 911104 411 1.6- 0.7+ 920210 897 (0.0 3.9+) 910815 894 0.7- 0.7- 911104 411 (0.2- 2.6-) 920210 897 (1.0+ 3.3+) 910815 188 (5.4+ 0.9-) 911104 411 (2.8- 1.8-) 920301 801 0.9+ 0.1+ 910818 589 (3.7+ 5.7+) 911104 411 1.4- 1.2- 920301 801 0.7+ 0.4+ 910818 589 (3.0+ 5.5+) 911106 168 (8.0- 2.6-) 920305 801 0.4+ 0.4- 910818 589 (2.1+ 5.3+) 911106 801 0.0 0.5- 920305 801 0.4+ 0.2- 910818 589 (1.3+ 4.8+) 911106 801 0.1+ 0.6- 920401 801 1.9+ 1.1- 910818 589 (1.0+ 4.6+) 911106 168 1.0- 1.5- 920401 801 1.5+ 1.0- 910818 589 (0.2+ 4.3+) 911106 168 (4.5- 3.5-) 920504 801 1.9+ 0.2- 910818 589 (0.6- 4.2+) 911109 900 0.0 0.5- 920504 801 1.6- 1.1- ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1994 Apr. 24