OAA computing section circular NK 682 82P/Gehrels 3
The following improved orbital elements, by S. Nakano, are from 73 observations 1975-1995. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.85 arc second. Epoch = 1993 Aug. 1.0 TT T = 1993 July 25.43442 +/- 0.00139 (m.e.) TT Peri. = 231.57037 +/- 0.00161 Node = 243.33910 +/- 0.00160 (2000.0) Inc. = 1.10014 +/- 0.00003 q = 3.4270001 +/- 0.0000011 AU e = 0.1507488 +/- 0.0000003 a = 4.0353199 +/- 0.0000005 AU n' = 0.12158700 +/- 0.00000002 P = 8.106 +/- 0.0000014 years T = 1977 Apr. 23.19098 TT Epoch = 1977 Apr. 7.0 TT Peri. = 231.16776 e = 0.1518990 Node = 243.55688 (2000.0) a = 4.0376674 AU Inc. = 1.09892 n'= 0.12148097 q = 3.4243498 AU P = 8.113 years T = 1985 June 3.38272 TT Epoch = 1985 May 15.0 TT Peri. = 230.99388 e = 0.1492916 Node = 243.45602 (2000.0) a = 4.0463212 AU Inc. = 1.09742 n'= 0.12109147 q = 3.4422395 AU P = 8.139 years The predicted orbit for the 2001 return is as follows: T = 2001 Sept. 3.06916 TT Epoch = 2001 Sept. 8.0 TT Peri. = 227.94807 e = 0.1256759 Node = 239.69003 (2000.0) a = 4.1479159 AU Inc. = 1.12719 n'= 0.11666999 q = 3.6266229 AU P = 8.448 years The following residuals in seconds of arc are from the above orbital elements: 1975/ 780211 801 0.1+ 0.6+ 920928 691 0.6- 0.5- 751027 675 0.1+ 1.8- 780302 381 1.2+ 1.2+ 920928 691 1.7- 0.7- 751028 675 (1.9+ 2.7-) 780302 381 0.2+ 0.7+ 920928 691 0.6- 0.4- 751030 675 0.5- 0.9+ 780305 381 1.2+ 0.3- 1993/ 751107 801 0.9+ 1.1+ 780312 885 0.2- 0.6+ 930122 691 0.5+ 0.2+ 751109 801 0.4- 1.0+ 780312 885 0.7+ 0.7- 930122 691 0.5+ 0.2+ 751110 801 0.6+ 1.7+ 780331 046 (2.5+ 1.2-) 930122 691 0.6+ 0.5- 751130 801 1.0- 0.6+ 780407 323 (2.8- 2.6+) 931209 691 0.0 0.4- 751130 801 0.4+ 0.1+ 780413 372 (0.1- 3.1+) 931209 691 0.7- 0.4- 751207 693 1.1+ 0.6+ 780509 323 0.1- 1.4+ 931209 691 0.7- 0.6- 751207 693 1.3+ 0.7+ 1984/ 1994/ 751208 801 0.9- 1.2+ 840807 675 2.2+ 0.1- 940116 691 0.4- 0.1- 751229 801 2.0- 1.7+ 840808 675 1.2+ 0.5+ 940116 691 0.3- 0.6- 1976/ 1985/ 940116 691 0.0 0.4- 760127 691 0.2- 0.5+ 851219 691 (3.9+ 1.0-) 940314 675 (4.1- 0.9-) 760225 801 1.6+ 1.8- 851219 691 (3.0+ 0.6-) 940314 675 (3.3+ 1.3+) 760226 801 1.7- 0.1- 851219 691 (2.8+ 0.9-) 940405 691 0.8+ 0.9- 761023 801 0.0 0.1- 1986/ 940405 691 1.2+ 0.9- 761120 801 0.8- 1.1+ 860116 691 (3.7+ 0.5-) 940405 691 0.6+ 0.8- 761124 693 0.5- 0.4+ 860116 691 (3.6+ 0.2+) 940502 691 0.3+ 1.1- 761124 693 0.2+ 0.6+ 1987/ 940502 691 0.1+ 1.0- 761216 801 0.7- 0.9+ 870501 691 0.9+ 0.4- 940502 691 0.7+ 1.0- 761224 693 0.3- 0.3+ 870501 691 1.7+ 0.3+ 940612 691 0.7- 0.0 761224 693 0.3- 0.5+ 870501 691 0.7+ 0.1+ 940612 691 0.0 0.7- 1977/ 870523 691 0.0 0.7+ 940612 691 1.0- 0.8- 770113 801 1.0- 0.6+ 870523 691 0.1+ 1.1+ 1995/ 770216 801 1.0- 0.6+ 870523 691 0.5- 1.2+ 950523 691 0.2- 0.7+ 770322 801 (3.6- 2.8+) 870524 691 0.5+ 0.2+ 950523 691 1.3+ 0.5+ 771118 801 1.2+ 0.3+ 870524 691 0.2+ 0.0 950523 691 0.4+ 0.6- 771211 801 0.5- 1.2+ 870524 691 0.3- 0.9+ 950523 691 2.0- 1.3+ 1978/ 1992/ 950623 691 1.3- 0.2+ 780203 323 (3.4- 0.9-) 920926 691 0.1+ 1.0- 950623 691 1.6- 1.1+ 780206 323 (1.5- 3.5-) 920926 691 0.8- 0.4- 950623 691 0.5- 0.3+ ( ) -------- Rejected Obs.
Director, Computing Section Computed date Syuichi Nakano 1997 July 10