OAA computing section circular NK 930 132P/Helin-Roman-Alu 2
The following improved orbital elements, by S. Nakano, are from 122 observations 1989 to 1998. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.65 arc second. Epoch = 1997 Nov. 8.0 TT T = 1997 Nov. 10.09237 +/- 0.00033 (m.e.) TT Peri. = 220.95862 +/- 0.00023 Node = 178.47971 +/- 0.00018 (2000.0) Inc. = 5.77565 +/- 0.00002 q = 1.9100175 +/- 0.0000013 AU e = 0.5316523 +/- 0.0000004 a = 4.0782042 +/- 0.0000010 AU n' = 0.11967422 +/- 0.00000005 P = 8.236 +/- 0.0000031 years T = 1989 Oct. 31.29511 TT Epoch = 1989 Nov. 10.0 TT Peri. = 200.33345 e = 0.5253903 Node = 203.07751 (2000.0) a = 4.0657854 AU Inc. = 7.42700 n'= 0.12022295 q = 1.9296614 AU P = 8.198 years The predicted orbit for the 2006 return is as follows: T = 2006 Feb. 14.99340 TT Epoch = 2006 Mar. 6.0 TT Peri. = 221.09840 e = 0.5299947 Node = 178.38773 (2000.0) a = 4.0939175 AU Inc. = 5.76593 n'= 0.11898588 q = 1.9241630 AU P = 8.283 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1989/ 970926 046 0.3- 0.0 971107 867 0.1+ 0.2+ 891026 675 0.2+ 1.8- 970926 046 0.6- 0.1- 971123 360 0.4- 0.4- 891028 675 1.5+ 2.4- 970926 046 0.6- 0.0 971123 360 0.1- 0.4- 891029 675 2.3- 0.1- 970929 360 0.3- 0.2- 971123 897 0.0 0.0 891030 413 1.4+ 0.7- 970929 360 0.4- 0.2- 971123 897 0.9+ 0.2+ 891030 400 (0.4+ 4.4+) 970930 402 0.7- 0.0 971124 352 0.5- 0.3- 891030 400 (1.3+ 4.4+) 970930 402 0.6- 0.1- 971124 352 0.9- 0.4- 891101 657 (3.8+ 0.2-) 970930 402 0.8- 0.0 971130 700 0.6- 0.6- 891102 400 0.7+ 1.4+ 971005 118 0.7- 0.1- 971130 700 0.2- 0.1+ 891102 400 (4.0+ 2.9+) 971005 118 0.7- 0.0 971130 700 0.3+ 0.3- 891102 372 0.5+ 0.3+ 971005 118 1.0- 0.1- 971130 700 0.5- 0.6- 891129 675 0.7- 1.4+ 971005 897 1.0- 0.1- 971204 352 0.0 0.0 891202 675 1.4- 0.5+ 971005 897 0.5- 0.1- 971204 352 0.1+ 0.3+ 1990/ 971005 897 1.0- 0.3+ 971204 352 0.4+ 0.5+ 900227 801 0.5+ 0.4- 971006 809 0.7+ 0.7- 971224 360 0.1- 0.1+ 900227 801 (1.5- 3.5+) 971006 809 1.0+ 0.2+ 971224 360 0.1- 0.1+ 1997/ 971006 867 0.5- 0.1+ 971225 897 0.1+ 1.9+ 970713 696 0.3- 0.7+ 971006 867 0.3- 0.0 971225 897 0.5- 0.3+ 970713 696 0.3- 0.5+ 971006 867 0.3- 0.2+ 971226 426 0.8+ 0.0 970713 696 0.2- 0.6+ 971007 809 0.8+ 0.8- 971226 426 0.8+ 0.0 970714 696 0.9+ 0.5+ 971007 809 0.2+ 0.6- 971231 691 1.0- 0.4- 970714 696 1.1+ 0.8+ 971012 691 0.1+ 0.8- 971231 691 0.9- 0.4- 970714 696 1.0+ 0.7+ 971012 691 0.1+ 0.4- 971231 691 0.9- 0.0 970808 402 0.1+ 0.8+ 971018 118 0.3+ 0.1- 971231 867 0.7+ 1.3+ 970808 402 0.3+ 1.0+ 971018 118 0.3+ 0.0 971231 867 0.6+ 0.9+ 970811 402 0.4+ 0.1- 971019 118 0.0 0.1+ 1998/ 970811 402 1.0- 0.0 971019 118 0.0 0.1+ 980105 352 0.5- 1.4+ 970811 402 0.2- 0.1- 971019 118 0.3- 0.1+ 980105 352 0.3- 1.6+ 970827 402 1.2+ 0.2+ 971026 897 0.5- 0.0 980105 352 0.9+ 0.6- 970827 402 0.7+ 0.2+ 971026 897 0.1+ 0.0 980111 046 0.2+ 0.2+ 970827 402 0.9+ 0.1+ 971026 897 0.2- 0.1+ 980111 046 0.0 0.1+ 970828 352 0.4- 0.9- 971027 360 0.2- 0.1+ 980111 046 0.0 0.4+ 970828 352 1.2+ 0.9+ 971027 360 0.4- 0.1+ 980120 897 1.6+ 0.3+ 970828 360 0.9+ 0.9+ 971028 352 0.2- 0.3+ 980120 897 0.8+ 2.3- 970828 360 1.0+ 0.8+ 971028 352 0.4- 0.1+ 980129 360 0.6+ 0.9+ 970831 557 0.5+ 0.1+ 971028 352 0.2- 0.1- 980129 360 0.3+ 0.7+ 970831 557 0.1+ 0.1+ 971028 900 1.3- 0.1+ 980220 118 0.3- 0.2- 970902 867 0.4+ 0.1- 971028 900 0.1+ 0.5+ 980220 118 0.5- 0.5- 970902 867 0.2+ 0.3- 971105 360 0.1+ 0.2- 980302 360 0.4+ 0.5- 970909 867 0.3+ 0.5- 971105 360 0.3+ 0.1- 980302 360 0.8+ 0.2- 970909 867 0.2+ 0.6- 971106 897 0.3+ 0.0 980309 046 1.8+ 1.3- 970909 867 1.0+ 0.3- 971106 897 0.3- 0.1+ 980309 046 (3.1+ 0.6-) 970910 360 0.5+ 0.4- 971106 897 0.3- 0.0 980503 696 0.0 0.6+ 970910 360 0.7+ 0.2- 971107 867 0.1+ 0.1+ 980503 696 0.1+ 0.6+ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2003 Apr. 14