OAA computing section circular NK 645 63P/Wild 1
The following improved orbital elements, by S. Nakano, are from 25 observations 1960-1973. Perturbations by Mercury to Neptune and five minor planets, Ceres, Pallas, Vesta, Iris and Bamberga, were taken into account. The mean residual is +/- 0.75 arc second. Epoch = 1973 July 17.0 TT T = 1973 July 2.84041 +/- 0.00094 (m.e.) TT Peri. = 167.94627 +/- 0.00028 Node = 358.89831 +/- 0.00011 (2000.0) Inc. = 19.89718 +/- 0.00007 q = 1.9805393 +/- 0.0000039 AU e = 0.6470826 +/- 0.0000007 a = 5.6119053 +/- 0.0000028 AU n' = 0.07413761 +/- 0.00000006 P = 13.294 +/- 0.0000099 years T = 1960 Mar. 17.35909 TT Epoch = 1960 Mar. 7.0 TT Peri. = 166.73592 e = 0.6545456 Node = 359.71515 (2000.0) a = 5.5780130 AU Inc. = 19.69539 n'= 0.07481433 q = 1.9269490 AU P = 13.174 years The predicted orbit for the 1999 return is as follows: T = 1999 Dec. 27.42558 TT Epoch = 1999 Dec. 8.0 TT Peri. = 167.99472 e = 0.6497308 Node = 358.52566 (2000.0) a = 5.5981542 AU Inc. = 19.93405 n'= 0.07441094 q = 1.9608612 AU P = 13.245 years The following residuals in seconds of arc are from the above orbital elements: 1960/ 600501 689 0.7+ 0.9- 730204 693 0.6- 0.5- 600326 009 0.5- 0.8+ 600501 689 0.1+ 0.5- 730204 693 0.0 1.3+ 600406 009 0.9+ 1.6+ 600516 689 0.3+ 0.4+ 730326 691 1.3+ 0.2- 600413 009 2.1- 0.5+ 600516 689 0.5+ 0.1+ 730326 691 1.0+ 0.1- 600416 689 0.4+ 0.5- 600621 689 1.0- 0.2- 730427 691 1.1- 1.0- 600416 689 0.5+ 0.3- 600622 689 0.5- 1.0+ 730427 691 1.4- 0.9- 600421 689 0.2+ 0.9- 600627 689 0.4+ 0.2- 730605 691 0.7+ 0.8+ 600421 689 0.1+ 0.4- 1973/ 730605 691 0.5+ 0.9+ 600425 689 0.0 0.1- 730108 691 0.1- 0.4- 600425 689 0.1- 0.4- 730129 691 (3.7+ 5.2+) ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1996 Apr. 14