OAA computing section circular NK 662 87P/Bus
The following improved orbital elements, by S. Nakano, are from 79 observations 1981-1995, 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. Epoch = 1994 June 17.0 TT T = 1994 June 28.03961 +/- 0.00152 (m.e.) TT Peri. = 24.39681 +/- 0.00074 Node = 182.22224 +/- 0.00054 (2000.0) Inc. = 2.57299 +/- 0.00003 q = 2.1830990 +/- 0.0000066 AU e = 0.3746201 +/- 0.0000012 a = 3.4908366 +/- 0.0000036 AU n' = 0.15111577 +/- 0.00000024 P = 6.522 +/- 0.0000101 years A1 = +2.282 +/- 0.291 A2 = -0.43793 +/- 0.01188 T = 1981 June 11.36896 TT Epoch = 1981 June 5.0 TT Peri. = 24.62342 e = 0.3747161 Node = 182.24931 (2000.0) a = 3.4907030 AU Inc. = 2.57231 n'= 0.15112445 q = 2.1826803 AU P = 6.522 years T = 1987 Dec. 19.52029 TT Epoch = 1987 Dec. 31.0 TT Peri. = 24.53444 e = 0.3727948 Node = 182.21187 (2000.0) a = 3.4960678 AU Inc. = 2.57016 n'= 0.15077673 q = 2.1927519 AU P = 6.537 years The predicted orbit for the 2000 return is as follows: T = 2000 Dec. 29.71706 TT Epoch = 2001 Jan. 11.0 TT Peri. = 24.14048 e = 0.3750045 Node = 182.20761 (2000.0) a = 3.4894377 AU Inc. = 2.57419 n'= 0.15120665 q = 2.1808827 AU P = 6.518 years The following residuals in seconds of arc are from the above orbital elements: 19/ 19/ 19/ 810209 413 (2.4- 4.6+) 870302 691 0.8+ 1.2+ 940406 691 0.4- 0.1+ 810213 413 (2.8- 4.5+) 870302 691 0.2+ 0.8+ 940406 691 0.5- 0.2- 810302 413 0.9- 0.2- 880614 474 0.7+ 1.2+ 940413 360 1.7+ 0.4- 810303 413 0.8- 0.2+ 880614 474 1.0- 1.7+ 940413 360 1.0+ 0.2- 810304 801 1.4+ 1.0+ 880619 474 1.2- 1.0+ 940430 360 1.8+ 0.8- 810304 801 1.5- 1.0+ 880619 474 1.1- 1.6+ 940430 360 (2.3+ 1.3-) 810305 372 (2.6- 4.2+) 880715 688 0.8+ 0.2- 940504 691 0.2- 0.3- 810305 372 (4.0- 4.4+) 880716 688 1.3+ 0.3- 940504 691 0.1- 0.4- 810307 413 (2.4- 1.2+) 930101 691 0.4- 0.0 940504 691 0.4- 0.3- 810309 372 0.5- 0.2+ 930101 691 0.7- 0.3- 940506 897 0.9+ 1.2- 810311 801 0.2- 0.7- 930101 691 0.2+ 0.4+ 940506 897 1.5+ 0.1- 810311 372 (2.4- 0.1+) 930101 691 0.8- 0.2+ 940506 897 (3.6+ 1.3-) 810316 413 0.8- 0.5- 930121 691 0.8+ 0.2+ 940511 801 0.8+ 0.2- 810403 474 (0.9- 6.3+) 930121 691 0.1+ 0.1- 940511 801 (5.0+ 1.5-) 810403 474 (0.3- 5.9+) 930121 691 0.0 0.1+ 940601 360 0.9+ 0.3+ 810425 675 2.1+ 0.0 930121 691 0.1+ 0.2- 940601 360 1.2+ 0.1- 810523 801 2.0+ 0.7- 940108 360 1.3- 0.9+ 940601 360 1.2+ 0.0 810524 801 (4.0+ 0.0 ) 940108 360 2.0- 1.5+ 940614 691 1.0- 0.7- 810606 801 (3.1+ 0.8-) 940108 360 1.2- 1.6+ 940614 691 0.9- 0.1- 810627 801 (7.0+ 2.0+) 940115 360 1.0- 0.9+ 940614 691 0.3- 0.3+ 870129 691 0.0 0.2+ 940115 360 1.3- 1.3+ 940705 360 0.4+ 1.3- 870129 691 0.3+ 0.0 940307 691 (3.5- 1.4+) 940705 360 0.4+ 1.1- 870129 691 0.3- 0.8+ 940307 691 (2.5- 1.1+) 940708 691 2.0- 1.5- 870129 691 0.4+ 0.3+ 940307 691 (3.5- 2.0+) 940708 691 1.6- 1.3- 870129 691 0.1+ 0.1+ 940309 323 1.2- 0.9+ 950527 691 2.0- 0.4+ 870201 691 0.2+ 0.4+ 940315 360 0.7+ 0.5+ 950527 691 0.1+ 0.3- 870201 691 0.6+ 0.0 940315 360 0.5+ 0.5+ 950527 691 0.4- 0.0 870201 691 0.1- 0.9+ 940317 360 0.5- 0.3- 950901 691 0.4+ 1.4+ 870228 691 0.4+ 0.4+ 940317 360 0.8- 0.2- 950901 691 0.8+ 1.7+ 870228 691 0.0 0.1+ 940331 897 0.8+ 0.7+ 951022 691 0.1+ 0.2- 870228 691 0.0 0.4+ 940331 897 1.1+ 0.5- 951022 691 0.2+ 1.8+ 870228 691 0.4+ 0.6+ 940406 691 0.5- 0.0 951022 691 0.5+ 1.7+ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1997 May 4