OAA computing section circular NK 694 89P/Russell 2

The following improved orbital elements, by S. Nakano, are from 38 observations 1980-1995. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.82 arc second. Epoch = 1994 Oct. 15.0 TT T = 1994 Oct. 27.30833 +/- 0.00205 (m.e.) TT Peri. = 249.16987 +/- 0.00037 Node = 42.53736 +/- 0.00017 (2000.0) Inc. = 12.04164 +/- 0.00004 q = 2.2764202 +/- 0.0000027 AU e = 0.3996778 +/- 0.0000006 a = 3.7919976 +/- 0.0000015 AU n' = 0.13347564 +/- 0.00000008 P = 7.384 +/- 0.0000045 years T = 1980 May 19.01849 TT Epoch = 1980 May 1.0 TT Peri. = 245.18615 e = 0.4167884 Node = 45.18565 (2000.0) a = 3.7010725 AU Inc. = 12.53079 n'= 0.13842441 q = 2.1585083 AU P = 7.120 years T = 1987 July 3.73617 TT Epoch = 1987 June 14.0 TT Peri. = 245.39060 e = 0.4178125 Node = 45.10895 (2000.0) a = 3.6953228 AU Inc. = 12.53409 n'= 0.13874761 q = 2.1513708 AU P = 7.104 years The predicted orbit for the 2002 return is as follows: T = 2002 Mar. 22.91393 TT Epoch = 2002 Mar. 27.0 TT Peri. = 249.21752 e = 0.3979114 Node = 42.48369 (2000.0) a = 3.8035465 AU Inc. = 12.02786 n'= 0.13286818 q = 2.2900720 AU P = 7.418 years The following residuals in seconds of arc are from the above orbital elements: 1980/ 870731 323 (3.8+ 1.9-) 940516 360 0.6+ 0.1+ 800809 413 1.4+ 1.6- 870818 323 (1.7+ 2.8-) 940516 360 1.3+ 0.6+ 800928 413 0.3+ 1.6- 870819 474 0.9- 0.8- 940601 360 1.0+ 0.1+ 801002 413 1.1+ 1.3+ 870819 474 0.1- 0.9- 940601 360 1.2+ 0.5+ 801003 413 0.8- 0.2+ 870828 323 (1.1- 2.9-) 940612 691 0.2- 0.3+ 801006 413 1.1- 0.1+ 1994/ 940612 691 0.3- 0.2+ 801006 323 (2.5+ 1.3+) 940405 691 0.8- 0.0 940612 691 0.3- 0.4+ 801007 323(11.3+ 12.5-) 940405 691 0.8- 0.3+ 940711 360 1.2+ 0.2- 1987/ 940405 691 1.0- 0.9- 940711 360 1.5+ 0.3+ 870701 323 0.3- 1.6+ 940406 691 0.2- 0.0 1995/ 870702 323 (0.3+ 2.8+) 940406 691 0.5+ 0.3+ 950826 950 0.4+ 0.2+ 870702 323 0.0 0.7- 940406 691 0.6- 0.1- 950826 950 0.1+ 0.2+ 870704 413 1.7- 0.2+ 940502 691 0.8- 0.0 950826 950 0.1+ 0.8+ 870706 323 0.2- 1.6+ 940502 691 1.1- 0.1- 950903 691 0.9- 0.9+ 870718 323 0.8+ 0.9- 940502 691 0.9- 0.2- 950903 691 1.0- 0.5+ 870724 323 1.8+ 0.9- 940516 360 0.7+ 0.6+ 950903 691 0.9- 0.7+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1999 Oct. 31

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