OAA computing section circular NK 661 71P/Clark
The following improved orbital elements, by S. Nakano, are from 154 observations 1984-1996, including planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effect of style II. The mean residual is +/- 1.16 arc seconds. Epoch = 1995 June 12.0 TT T = 1995 May 31.10056 +/- 0.00028 (m.e.) TT Peri. = 208.85132 +/- 0.00042 Node = 59.72297 +/- 0.00035 (2000.0) Inc. = 9.50479 +/- 0.00005 q = 1.5525809 +/- 0.0000028 AU e = 0.5019794 +/- 0.0000012 a = 3.1175033 +/- 0.0000030 AU n' = 0.17905798 +/- 0.00000025 P = 5.504 +/- 0.0000078 years A1 = +1.274 +/- 0.074 A2 = -0.38445 +/- 0.00623 T = 1984 May 29.06098 TT Epoch = 1984 May 20.0 TT Peri. = 209.05775 e = 0.5023409 Node = 59.73559 (2000.0) a = 3.1172119 AU Inc. = 9.50751 n'= 0.17908310 q = 1.5513089 AU P = 5.504 years T = 1989 Nov. 28.47796 TT Epoch = 1989 Nov. 10.0 TT Peri. = 208.97971 e = 0.5012808 Node = 59.71936 (2000.0) a = 3.1198452 AU Inc. = 9.50023 n'= 0.17885641 q = 1.5559268 AU P = 5.511 years The predicted orbit for the 2000 return is as follows: T = 2000 Dec. 2.05482 TT Epoch = 2000 Dec. 2.0 TT Peri. = 208.84442 e = 0.5005299 Node = 59.69218 (2000.0) a = 3.1216046 AU Inc. = 9.49500 n'= 0.17870522 q = 1.5591482 AU P = 5.515 years The following residuals in seconds of arc are from the above orbital elements: 19/ 19/ 19/ 831215 675(22.9- 15.7+) 950219 897 0.5+ 1.2+ 950621 372 0.1- 0.3+ 840130 474(24.0- 12.8+) 950226 897 0.7- 0.5+ 950624 367 1.3+ 0.5- 840130 474(22.9- 15.2+) 950226 897 0.6- 0.1- 950624 367 1.6+ 1.3- 840201 707(20.4- 14.4+) 950306 359 1.0- 0.5+ 950624 367 1.7+ 1.6- 840202 323(22.8- 14.0+) 950306 359 0.6- 0.3+ 950629 372 0.1+ 0.1+ 840211 801(15.3- 13.6+) 950306 359 0.2- 0.2- 950708 372 0.2+ 0.7+ 840406 323(12.4- 8.5+) 950308 422 1.3- 0.0 950709 372 0.0 1.1+ 840409 323(12.1- 8.9+) 950308 360 0.6+ 0.0 950709 360 0.5+ 1.0- 840412 323 (7.6- 11.1+) 950308 360 0.3+ 0.1+ 950709 360 0.4+ 1.2- 840503 323 (4.6- 6.1+) 950308 360 0.3+ 0.2+ 950714 897 0.3+ 0.4- 840529 474 (0.5+ 3.2+) 950308 897 0.3- 0.9+ 950714 897 0.3+ 2.0- 840529 474 (0.3+ 2.9+) 950308 897 0.0 0.0 950714 897 0.1+ 1.4- 840604 809 (3.1- 3.0+) 950311 422 1.5+ 0.7+ 950723 897 1.6+ 0.4- 840604 809 (4.4- 3.5+) 950311 422 1.0+ 0.5+ 950723 897 0.3- 0.6+ 840606 323 0.8- 1.2+ 950328 801 0.6- 0.2+ 950725 372 1.5- 0.4+ 840625 323 1.0+ 0.9- 950328 801 (2.8+ 0.5+) 950727 360 0.9- 1.2- 840628 491 (1.9+ 4.7-) 950403 801 1.9+ 0.5+ 950727 360 0.9- 1.2- 840628 299 (6.0- 3.7-) 950403 801 1.7+ 0.0 950731 360 0.8- 1.3- 840629 299 0.8- 1.7+ 950403 897 1.3+ 0.3+ 950731 360 1.0- 1.1- 840710 299 0.4- 0.9- 950403 897 (2.6+ 0.3-) 950731 372 1.3- 1.2+ 840725 474 0.6- 0.4+ 950403 897 0.7+ 0.2- 950802 323 0.8- 1.1- 840725 474 0.4- 0.6+ 950403 323 1.8+ 0.2- 950814 897 2.0- 1.0- 840726 299 (2.9- 0.7-) 950407 410 0.7+ 0.6+ 950814 897 0.7- 1.6- 840728 299 0.9- 0.4- 950407 410 1.9+ 0.9+ 950815 323 1.5- 1.5- 840731 299 0.9+ 1.6- 950407 410 2.3+ 0.9+ 950816 360 1.5- 1.4- 840802 299 0.3+ 0.1+ 950407 897 (2.5+ 0.1-) 950816 360 1.5- 1.4- 840804 299 0.9+ 0.1- 950407 897 1.5+ 1.0- 950818 360 1.1- 1.7- 840825 474 0.1+ 1.2+ 950426 360 (3.1+ 0.9+) 950818 360 1.2- 1.7- 840825 474 0.2+ 1.7+ 950426 360 (3.2+ 0.8+) 950822 900 0.8- 1.8- 890102 675 1.8- 0.5+ 950502 801 (3.2+ 0.3+) 950827 323 (0.2- 3.8+) 890102 675 1.6- 0.5+ 950502 801 (3.3+ 0.4+) 950911 834 (3.9- 1.8-) 890102 675 1.5- 0.5+ 950503 323 2.2+ 0.2+ 950917 897 1.7- 1.4- 890102 675 1.6- 0.5+ 950504 801 (3.3+ 0.4+) 950917 897 (0.1+ 2.4-) 890117 675 0.8+ 0.9- 950504 801 (3.6+ 0.7-) 950920 691 1.8- 1.3- 890117 675 0.8+ 0.8- 950505 360 (3.9+ 0.1+) 950920 691 1.4- 1.2- 890117 675 0.4+ 0.7- 950505 360 (3.7+ 0.1+) 950920 691 1.6- 1.4- 890118 675 1.1+ 0.7- 950505 360 (3.3+ 0.3+) 950921 897 1.7- 0.4- 890118 675 1.0+ 0.8- 950508 360 (3.3+ 0.3-) 951013 360 1.1- 1.2- 890118 675 0.8+ 1.0- 950508 360 (3.2+ 0.3-) 951013 360 1.2- 1.1- 941205 372 1.0- 2.0+ Y 950517 897 (3.1+ 0.9+) 951014 410 (2.4- 2.0-) 941205 360 0.9- 1.6+ 950517 897 2.3+ 0.9+ 951014 410 1.0- 1.7- 941205 360 1.6- 1.9+ 950517 897 (3.1+ 0.1+) 951014 410 (1.9- 3.3-) 941205 360 0.6- 1.4+ 950522 359 2.3+ 2.1+ 951020 360 0.6- 1.0- 941206 360 (3.5- 2.1+) 950522 897 (3.5+ 1.0+) 951020 360 0.2- 1.4- 941206 360 (3.0- 2.0+) 950522 359 (3.5+ 0.4+) 951020 410 (0.7+ 2.9-) 941229 887 (1.3- 2.9+) 950522 897 (3.3+ 0.8+) 951020 410 0.6+ 1.6- 941229 887 (1.9- 2.4+) 950522 359 (3.3+ 3.9-) 951020 410 0.1- 0.9- 950101 385 0.3- 0.9+ 950522 372 (2.7+ 0.1+) 951025 691 1.8- 0.9- 950101 385 0.2+ 1.2+ 950523 372 (2.5+ 0.3+) 951025 691 1.8- 1.3- 950101 385 1.3+ 1.3+ 950523 360 (3.1+ 0.0 ) 951025 360 0.2- 1.5- 950106 372 (2.8- 1.9+)Y 950523 372 (2.8+ 0.9+) 951025 360 0.0 0.9- 950106 372 (2.0- 2.4+)Y 950523 360 (3.0+ 0.1+) 951025 897 2.1+ 2.0- 950110 887 1.5- 0.8+ 950526 367 2.1+ 0.2+ 951027 693 2.0- 0.9- 950110 887 1.4- 1.5+ 950526 367 2.3+ 0.1+ 951027 693 1.4- 1.8- 950110 887 1.6- 2.0+ 950526 367 2.1+ 0.1- 951027 693 2.2- 0.4- 950113 897 2.0- 1.9+ 950526 372 (2.6+ 0.3-) 951116 360 0.6- 1.5- 950113 897 0.9- 1.0+ 950527 410 (2.7+ 1.0+) 951116 360 0.5- 1.2- 950113 897 1.6- 2.0+ 950527 410 (2.5+ 1.3+) 951117 691 (2.6- 1.2-) 950113 372 (1.4- 2.9+)Y 950527 410 (2.8+ 0.6+) 951117 691 (2.8- 1.3-) 950113 372 0.7- 2.2+ Y 950527 402 (2.7+ 0.7+) 951117 691 (2.7- 1.3-) 950126 897 1.1- 2.2+ 950527 402 2.2+ 0.4+ 951117 801 (2.6- 4.8-) 950126 897 1.2- 0.3+ 950527 372 1.5+ 0.7- 951117 801 (2.6+ 2.6-) 950126 897 0.4- 1.1+ 950531 402 1.4+ 0.5+ 951210 360 1.9- 1.8- 950126 385 1.3- 1.0+ 950531 402 1.3+ 0.4+ 951210 360 1.3- 2.0- 950126 385 0.9- 1.6+ 950601 897 1.3+ 0.0 951231 691 1.7- 1.4- 950128 691 0.9- 0.8+ 950601 897 0.6+ 0.1- 951231 691 1.4- 1.5- 950128 691 0.6- 0.4+ 950601 360 1.1+ 0.2- 951231 691 2.1- 1.6- 950128 691 0.6- 0.7+ 950601 360 1.3+ 0.4- 961118 691 1.0+ 0.6+ 950129 691 1.8- 1.7+ 950601 402 1.5+ 0.6+ 961118 691 0.1+ 0.5+ 950129 691 0.4- 1.7+ 950601 402 1.7+ 0.4+ 961215 691 0.3+ 1.0+ 950129 691 (0.7- 2.7+) 950601 372 1.3+ 1.3- 961215 691 0.0 0.8+ 950210 360 0.5- 1.2+ 950605 360 0.8+ 0.7- 961215 691 0.7- 0.2+ 950210 360 0.7- 1.3+ 950605 360 0.6+ 0.5- 950219 897 0.2- 1.1+ 950605 372 1.9+ 0.5- ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1997 May 4