OAA computing section circular NK 636 37P/Forbes
The following improved orbital elements, by S. Nakano, are from 103 observations 1980-1994, including planetary perturbations by Mercury to Pluto and five minor planets, Ceres, Pallas, Vesta, Iris, Bamberga and non-gravitational effect of style II. The mean residual is +/- 0.86 arc second. Epoch = 1993 Apr. 3.0 TT T = 1993 Mar. 14.67809 +/- 0.00030 (m.e.) TT Peri. = 310.53978 +/- 0.00025 Node = 334.45685 +/- 0.00024 (2000.0) Inc. = 7.15930 +/- 0.00002 q = 1.4468558 +/- 0.0000015 AU e = 0.5680576 +/- 0.0000003 a = 3.3496497 +/- 0.0000013 AU n' = 0.16076999 +/- 0.00000009 P = 6.131 +/- 0.0000035 years A1 = +0.335 +/- 0.023 A2 = -0.03811 +/- 0.00087 T = 1980 Sept.24.77420 TT Epoch = 1980 Oct. 8.0 TT Peri. = 262.57624 e = 0.5648802 Node = 23.67905 (2000.0) a = 3.3992342 AU Inc. = 4.67062 n'= 0.15726513 q = 1.4790741 AU P = 6.267 years T = 1987 Jan. 1.67418 TT Epoch = 1987 Jan. 5.0 TT Peri. = 262.75548 e = 0.5656742 Node = 23.57177 (2000.0) a = 3.3951166 AU Inc. = 4.67075 n'= 0.15755132 q = 1.4745866 AU P = 6.256 years The predicted orbit for the 1999 return is as follows: T = 1999 May 4.19535 TT Epoch = 1999 May 22.0 TT Peri. = 310.70488 e = 0.5681220 Node = 334.36743 (2000.0) a = 3.3482266 AU Inc. = 7.16275 n'= 0.16087250 q = 1.4460254 AU P = 6.127 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 800312 809 0.4+ 0.3- 930321 323 (3.7- 0.5-) 930926 411 0.2- 0.6- 800313 801 1.0+ 0.5+ 930327 323 (4.3- 0.9-) 931011 360 0.9+ 0.9+ 800313 801 1.9- 0.2- 930327 323 0.8+ 0.5- 931011 360 0.7+ 0.7+ 800314 809 0.3- 0.3- 930328 323 0.6- 0.6- 931011 900 (3.4+ 1.4-) 800414 805 0.5+ 0.6+ 930416 323 0.7+ 1.4+ 931011 900 0.9- 1.8- 800415 805 0.5+ 0.4+ 930419 323 1.5+ 1.9+ 931014 675 0.2- 1.6- 800416 805 0.7+ 0.5- 930510 413 0.7- 0.0 931014 675 0.2+ 2.1- 800418 381 0.9+ 0.4+ 930510 413 0.7- 0.0 931015 675 0.4+ 1.7- 800418 381 1.6+ 0.4+ 930511 413 0.9- 0.0 931019 360 0.9+ 0.6+ 800517 801 0.5- 1.1- 930511 413 0.9- 0.2+ 931019 360 0.9+ 0.6+ 800606 381 0.0 0.2- 930515 411 0.5- 1.0- 931020 657 0.3+ 0.1- 800613 801 1.7- 0.3+ 930515 411 0.2- 0.7- 931020 657 0.5- 0.9- 800706 474 (4.4- 1.0+) 930527 361 (5.8- 4.7-) 931020 657 0.3+ 1.1- 800706 474 2.3- 0.8+ 930527 361 (4.4- 2.6-) 931023 411 1.0+ 0.3- 800903 323 1.2- 0.0 930701 413 0.2+ 0.1+ 931023 411 1.0+ 1.0- 800917 323 1.1+ 0.6- 930701 413 0.3- 0.9+ 931024 691 0.8- 0.2+ 860408 675 1.3+ 1.0- 930721 691 1.9- 0.1+ 931024 691 1.1- 0.3+ 860408 675 0.1+ 0.1- 930722 360 0.5- 1.5+ 931024 691 0.7- 0.3+ 860509 675 0.5+ 0.7- 930722 360 0.9- 0.4+ 931024 411 1.7- 0.8+ 860509 675 0.4+ 0.8- 930723 691 1.6- 0.5+ 931024 411 0.1- 1.1- 860609 675 0.7- 0.4+ 930731 413 0.9- 1.5+ 931114 411 0.5+ 0.1+ 860609 675 0.8- 0.5+ 930731 413 0.8- 1.4+ 931114 411 0.8+ 0.8+ 860610 675 0.7- 0.0 930811 411 0.8- 1.0- 931114 411 1.0- 0.3- 860610 675 0.9- 0.1+ 930811 411 0.7- 0.0 931118 360 1.5+ 0.6+ 860612 707 1.2- 0.3- 930813 691 1.3- 0.1+ 931118 360 1.4+ 0.7+ 870901 691 0.7+ 0.3+ 930814 557 (2.8- 1.2-) 931210 691 0.1+ 1.9+ 870901 691 0.6+ 0.2+ 930814 557 1.2- 0.4+ 931210 691 0.4+ 0.5+ 870901 691 0.6+ 0.2+ 930824 360 0.5- 0.0 931210 691 0.1+ 0.6+ 870901 691 0.8+ 0.0 930824 360 0.5- 0.6- 931212 360 2.2+ 0.7+ 870901 691 0.4+ 0.3+ 930824 360 0.7+ 0.3+ 931212 360 2.0+ 0.5+ 870919 691 0.0 0.3- 930914 691(13.6- 10.0+) 931215 360 1.8+ 0.9+ 870920 691 1.0- 0.1- 930914 411 2.2- 0.1- 931215 360 1.2+ 0.7+ 870920 691 0.1- 0.7- 930925 816 0.2+ 1.0- 940107 691 0.2- 0.0 871016 691 0.6- 0.1+ 930925 816 0.1- 1.0- 940107 691 0.8+ 0.4+ 871016 691 0.2- 0.2+ 930925 360 0.2+ 0.3- 940109 360 1.5+ 0.9+ 871016 691 0.5- 0.2+ 930925 360 0.0 0.4- 940109 360 1.4+ 1.4+ 930321 323 (5.6+ 2.9+) 930926 411 0.0 1.0- 930321 323 0.3+ 0.1- 930926 411 0.0 0.8- ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1996 Apr. 11