OAA computing section circular NK 1453 82P/Gehrels 3
The following improved orbital elements, by S. Nakano, are from 101 observations 1975 to 2002. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.75 arc second. See previous orbits in NK 682 and HICQ 2007. Epoch = 2001 Sept. 8.0 TT T = 2001 Sept. 3.06898 +/- 0.00070 (m.e.) TT Peri. = 227.94741 +/- 0.00132 Node = 239.69081 +/- 0.00132 (2000.0) Inc. = 1.12712 +/- 0.00002 q = 3.6266275 +/- 0.0000017 AU e = 0.1256750 +/- 0.0000004 a = 4.1479169 +/- 0.0000006 AU n' = 0.11666995 +/- 0.00000003 P = 8.448 +/- 0.0000019 years T = 1977 Apr. 23.19249 TT Epoch = 1977 Apr. 7.0 TT Peri. = 231.16691 e = 0.1518987 Node = 243.55794 (2000.0) a = 4.0376667 AU Inc. = 1.09885 n'= 0.12148100 q = 3.4243503 AU P = 8.113 years T = 1985 June 3.38356 TT Epoch = 1985 May 15.0 TT Peri. = 230.99304 e = 0.1492913 Node = 243.45708 (2000.0) a = 4.0463205 AU Inc. = 1.09736 n'= 0.12109150 q = 3.4422400 AU P = 8.139 years T = 1993 July 25.43450 TT Epoch = 1993 Aug. 1.0 TT Peri. = 231.56953 e = 0.1507486 Node = 243.34016 (2000.0) a = 4.0353192 AU Inc. = 1.10007 n'= 0.12158703 q = 3.4270005 AU P = 8.106 years The predicted orbit for the 2010 return is as follows: T = 2010 Jan. 12.08139 TT Epoch = 2010 Jan. 4.0 TT Peri. = 226.26739 e = 0.1222275 Node = 239.51001 (2000.0) a = 4.1393127 AU Inc. = 1.12609 n'= 0.11703391 q = 3.6333748 AU P = 8.422 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1975/ 840807 675 1.9+ 0.2- 940612 691 0.3- 0.0 751027 675 0.1- 1.8- 840808 675 0.9+ 0.4+ 940612 691 0.4+ 0.6- 751028 675 (1.8+ 2.7-) 1985/ 940612 691 0.6- 0.8- 751030 675 0.7- 0.9+ 851219 691 (3.5+ 1.1-) 1995/ 751107 801 0.7+ 1.1+ 851219 691 (2.7+ 0.7-) 950523 691 1.1- 1.0+ 751109 801 0.6- 1.0+ 851219 691 (2.4+ 1.0-) 950523 691 0.4+ 0.8+ 751110 801 0.4+ 1.7+ 1986/ 950523 691 0.5- 0.3- 751130 801 0.2+ 0.1+ 860116 691 (3.3+ 0.6-) 950523 691 (2.9- 1.5+) 751130 801 1.1- 0.6+ 860116 691 (3.2+ 0.1+) 950623 691 (2.1- 0.5+) 751207 693 1.0+ 0.6+ 1987/ 950623 691 (2.3- 1.4+) 751207 693 1.1+ 0.7+ 870501 691 0.3+ 0.2- 950623 691 1.2- 0.5+ 751208 801 1.0- 1.2+ 870501 691 1.2+ 0.4+ 2002/ 751229 801 2.1- 1.7+ 870501 691 0.2+ 0.2+ 020110 644 (2.5- 1.4-) 1976/ 870523 691 0.5- 0.8+ 020110 644 0.4+ 0.7- 760127 691 0.3- 0.4+ 870523 691 0.3- 1.2+ 020110 644 1.0- 0.1- 760225 801 1.5+ 1.8- 870523 691 1.0- 1.3+ 020111 461 0.9- 0.5+ 760226 801 1.8- 0.2- 870524 691 0.0 0.3+ 020111 461 0.0 0.6- 761023 801 0.1+ 0.3- 870524 691 0.3- 0.1+ 020111 461 0.2- 0.3+ 761120 801 0.7- 0.8+ 870524 691 0.8- 1.0+ 020112 461 0.4- 0.8+ 761124 693 0.4- 0.2+ 1992/ 020112 461 1.1- 0.4+ 761124 693 0.3+ 0.4+ 920926 691 0.2+ 1.1- 020113 461 0.2+ 1.0+ 761216 801 0.6- 0.7+ 920926 691 0.6- 0.5- 020113 461 0.5+ 1.3+ 761224 693 0.2- 0.1+ 920928 691 0.4- 0.6- 020113 461 0.3+ 1.7+ 761224 693 0.1- 0.2+ 920928 691 1.6- 0.9- 020113 461 0.6- 0.7+ 1977/ 920928 691 0.5- 0.6- 020113 461 1.4+ 0.4+ 770113 801 0.9- 0.3+ 1993/ 020113 461 0.3- 0.3- 770216 801 0.9- 0.3+ 930122 691 0.6+ 0.1- 020119 867 0.6+ 1.1- 770322 801 (3.5- 2.6+) 930122 691 0.6+ 0.1- 020119 867 0.6- 0.5- 771118 801 1.2+ 0.1+ 930122 691 0.7+ 0.8- 020119 867 0.4- 0.0 771211 801 0.5- 0.9+ 931209 691 0.2+ 0.3- 020119 867 0.3- 0.1+ 1978/ 931209 691 0.5- 0.4- 020211 704 0.5- 0.1+ 780203 323 (3.4- 1.2-) 931209 691 0.5- 0.6- 020211 704 0.7- 0.7- 780206 323 (1.5- 3.8-) 1994/ 020211 704 0.6- 0.4+ 780211 801 0.1+ 0.3+ 940116 691 0.3- 0.1- 020211 704 0.7+ 0.3- 780302 381 1.2+ 0.9+ 940116 691 0.3- 0.6- 020211 704 0.1- 0.5- 780302 381 0.2+ 0.4+ 940116 691 0.1+ 0.3- 020214 691 0.1+ 0.0 780305 381 1.3+ 0.6- 940314 675 (5.1- 0.9-) 020214 691 0.0 0.0 780312 885 0.2- 0.3+ 940314 675 (2.3+ 1.3+) 020214 691 0.2- 0.1- 780312 885 0.7+ 1.0- 940405 691 0.9+ 0.9- 020215 691 0.3- 0.1+ 780331 046 (2.5+ 1.5-) 940405 691 1.4+ 0.9- 020215 691 0.6+ 0.6- 780407 323 (2.8- 2.3+) 940405 691 0.8+ 0.8- 020215 691 1.8+ 0.7- 780413 372 (0.8- 2.8+)Y 940502 691 0.6+ 1.1- 020308 360 0.4+ 0.8+ 780509 323 0.1- 1.2+ 940502 691 0.4+ 1.0- 020308 360 0.5- 0.6+ 1984/ 940502 691 0.9+ 1.0- 020308 360 0.2- 0.8+ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2007 Apr. 10