OAA computing section circular NK 1051 87P/Bus

The following improved orbital elements, by S. Nakano, are from 83 observations 1981 to 2000, 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 +/- 0.86 arc second. See a previous orbit in NK 662. Epoch = 2001 Jan. 11.0 TT T = 2000 Dec. 29.75568 +/- 0.00254 (m.e.) TT Peri. = 24.14477 +/- 0.00066 Node = 182.20781 +/- 0.00052 (2000.0) Inc. = 2.57414 +/- 0.00003 q = 2.1809071 +/- 0.0000025 AU e = 0.3750076 +/- 0.0000003 a = 3.4894936 +/- 0.0000012 AU n' = 0.15120302 +/- 0.00000008 P = 6.518 +/- 0.0000034 years A1 = +0.597 +/- 0.134 A2 = -0.35559 +/- 0.00442 T = 1981 June 11.34997 TT Epoch = 1981 June 5.0 TT Peri. = 24.61640 e = 0.3747115 Node = 182.24949 (2000.0) a = 3.4907116 AU Inc. = 2.57226 n'= 0.15112389 q = 2.1827019 AU P = 6.522 years T = 1987 Dec. 19.50514 TT Epoch = 1987 Dec. 31.0 TT Peri. = 24.53134 e = 0.3727926 Node = 182.21206 (2000.0) a = 3.4960916 AU Inc. = 2.57011 n'= 0.15077519 q = 2.1927745 AU P = 6.537 years T = 1994 June 28.04235 TT Epoch = 1994 June 17.0 TT Peri. = 24.39702 e = 0.3746204 Node = 182.22244 (2000.0) a = 3.4908752 AU Inc. = 2.57293 n'= 0.15111326 q = 2.1831221 AU P = 6.522 years The predicted orbit for the 2007 return is as follows: T = 2007 July 7.23541 TT Epoch = 2007 June 29.0 TT Peri. = 24.24183 e = 0.3763992 Node = 182.18821 (2000.0) a = 3.4851451 AU Inc. = 2.57691 n'= 0.15148610 q = 2.1733393 AU P = 6.506 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1981/ 880614 474 (2.9- 1.8+) 940430 360 (2.2+ 1.1-) 810209 413 (1.7- 4.4+) 880614 474 (4.6- 2.4+) 940504 691 0.3- 0.1- 810213 413 (2.1- 4.3+) 880619 474 (4.7- 1.7+) 940504 691 0.2- 0.2- 810302 413 0.3- 0.4- 880619 474 (4.6- 2.3+) 940504 691 0.4- 0.1- 810303 413 0.2- 0.1+ 880715 688 2.2- 0.4+ 940506 897 0.9+ 1.0- 810304 801 2.0+ 0.8+ 880716 688 1.7- 0.4+ 940506 897 1.5+ 0.1+ 810304 801 0.9- 0.8+ 1993/ 940506 897 (3.6+ 1.1-) 810305 372 (2.0- 4.0+) 930101 691 0.2- 0.3- 940511 801 0.9+ 0.1- 810305 372 (3.4- 4.2+) 930101 691 0.6- 0.6- 940511 801 (5.1+ 1.3-) 810307 413 1.9- 1.0+ 930101 691 0.3+ 0.2+ 940601 360 1.3+ 0.4+ 810309 372 0.0 0.1+ 930101 691 0.6- 0.0 940601 360 1.6+ 0.1- 810311 801 0.3+ 0.8- 930121 691 0.9+ 0.0 940601 360 1.6+ 0.1+ 810311 372 1.9- 0.0 930121 691 0.2+ 0.4- 940614 691 0.3- 0.8- 810316 413 0.3- 0.6- 930121 691 0.1+ 0.2- 940614 691 0.2- 0.2- 810403 474 (0.7- 6.3+) 930121 691 0.2+ 0.5- 940614 691 0.4+ 0.2+ 810403 474 (0.1- 5.9+) 1994/ 940705 360 1.5+ 1.5- 810425 675 1.7+ 0.3+ 940108 360 1.8- 0.9+ 940705 360 1.5+ 1.3- 810523 801 1.2+ 0.2- 940108 360 (2.5- 1.6+) 940708 691 0.9- 1.7- 810524 801 (3.1+ 0.5+) 940108 360 1.7- 1.6+ 940708 691 0.5- 1.5- 810606 801 2.2+ 0.3- 940115 360 1.4- 0.9+ 1995/ 810627 801 (6.3+ 2.5+) 940115 360 1.8- 1.3+ 950527 691 1.4- 0.8+ 1987/ 940307 691 (3.8- 1.5+) 950527 691 0.7+ 0.0 870129 691 0.1+ 0.1+ 940307 691 (2.8- 1.2+) 950527 691 0.2+ 0.4+ 870129 691 0.4+ 0.2- 940307 691 (3.8- 2.0+) 950901 691 0.6+ 1.6+ 870129 691 0.2- 0.6+ 940309 323 1.5- 0.9+ 950901 691 0.9+ 1.9+ 870129 691 0.6+ 0.1+ 940315 360 0.4+ 0.6+ 951022 691 0.1- 0.1- 870129 691 0.3+ 0.0 940315 360 0.2+ 0.6+ 951022 691 0.0 1.9+ 870201 691 0.3+ 0.3+ 940317 360 0.8- 0.2- 951022 691 0.3+ 1.8+ 870201 691 0.7+ 0.1- 940317 360 1.1- 0.1- 1997/ 870201 691 0.1+ 0.7+ 940331 897 0.5+ 0.8+ 971230 568 0.4+ 0.5+ 870228 691 0.3+ 0.3+ 940331 897 0.8+ 0.4- 1999/ 870228 691 0.1- 0.0 940406 691 0.8- 0.2+ 991113 695 1.6- 0.5+ 870228 691 0.2- 0.3+ 940406 691 0.7- 0.3+ 991113 695 0.9- 0.1+ 870228 691 0.2+ 0.4+ 940406 691 0.8- 0.0 2000/ 870302 691 0.5+ 1.1+ 940413 360 1.4+ 0.2- 000501 695 0.1+ 0.2+ 870302 691 0.0 0.6+ 940413 360 0.8+ 0.0 000501 695 0.2+ 0.1- 1988/ 940430 360 1.7+ 0.6- 000501 695 0.5+ 0.2+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2004 Apr. 7

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