OAA computing section circular NK 1100 62P/Tsuchinshan 1

The following improved orbital elements, by S. Nakano, are from 155 observations 1984 to 2004, 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 +/- 0.83 arc second. See previous orbits in NK 622 and NK 795. Epoch = 2004 Dec. 21.0 TT T = 2004 Dec. 7.91838 +/- 0.00058 (m.e.) TT Peri. = 22.84877 +/- 0.00040 Node = 96.76832 +/- 0.00010 (2000.0) Inc. = 10.50223 +/- 0.00002 q = 1.4892508 +/- 0.0000012 AU e = 0.5778083 +/- 0.0000009 a = 3.5274279 +/- 0.0000024 AU n' = 0.14877051 +/- 0.00000015 P = 6.625 +/- 0.0000067 years A1 = +0.567 +/- 0.047 A2 = -0.00671 +/- 0.00012 T = 1985 Jan. 2.39293 TT Epoch = 1985 Jan. 15.0 TT Peri. = 22.80579 e = 0.5745456 Node = 96.84243 (2000.0) a = 3.5440445 AU Inc. = 10.48744 n'= 0.14772545 q = 1.5078293 AU P = 6.672 years T = 1991 Aug. 30.55605 TT Epoch = 1991 Aug. 12.0 TT Peri. = 22.79380 e = 0.5763287 Node = 96.84875 (2000.0) a = 3.5345885 AU Inc. = 10.50138 n'= 0.14831866 q = 1.4975036 AU P = 6.645 years T = 1998 Apr. 19.05058 TT Epoch = 1998 Apr. 17.0 TT Peri. = 22.76890 e = 0.5766052 Node = 96.81059 (2000.0) a = 3.5329979 AU Inc. = 10.49515 n'= 0.14841883 q = 1.4958530 AU P = 6.641 years The predicted orbit for the 2011 return is as follows: T = 2011 June 30.39152 TT Epoch = 2011 July 18.0 TT Peri. = 30.23095 e = 0.5974305 Node = 90.30937 (2000.0) a = 3.4370288 AU Inc. = 9.71323 n'= 0.15467828 q = 1.3836430 AU P = 6.372 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1984/ 911111 372 (0.8+ 4.4-) 980302 897 1.4- 0.8- 840904 372 (4.6+ 3.4+)Y 911112 372 0.9- 1.9- 980308 605 0.5+ 0.1+ 840905 675 1.1+ 0.6- 1997/ 980308 605 (3.5+ 4.3-) 840906 675 0.5+ 0.8- 971012 691 0.7- 0.3+ 980309 046 0.0 0.1- 840922 372 (0.4- 4.4-) 971012 691 1.1- 1.3+ 980309 046 0.8- 0.2- 841120 801 0.5- 0.8+ 971012 691 1.2- 0.1- 980309 046 0.5- 0.2+ 841127 801 0.1+ 0.6- 971102 867 0.6+ 0.3+ 980309 504 0.4+ 0.4+ 841205 657 (0.1+ 3.1-) 971102 867 0.7+ 0.4- 980309 504 0.4+ 0.2- 841218 801 0.6+ 1.8+ 971102 867 0.1- 0.4+ 980309 504 1.0+ 0.8+ 841223 801 1.2+ 0.8+ 971102 867 0.8+ 0.3+ 980309 504 0.3+ 0.9+ 841228 330 (0.3+ 5.2+) 971103 867 (2.2+ 0.8+) 980310 118 1.1- 0.4- 841229 330 1.9- 0.1- 971103 867 1.7+ 1.3- 980310 118 0.4- 0.7- 1985/ 971103 867 (2.5+ 0.1-) 980312 605 0.1- 0.6- 850117 707 0.8+ 0.4+ 971108 696 0.0 0.1- 980312 605 1.8- 0.2+ 850117 691 0.1- 0.4+ 971108 696 0.2- 0.2- 980316 428 (3.8+ 0.5+) 850117 691 0.1+ 1.0- 971108 696 0.0 0.1- 980318 897 1.8+ 0.9- 850117 691 0.1+ 1.8- 971225 402 0.1- 1.2+ 980318 897 0.4+ 0.3- 850120 691 0.2- 0.1- 971225 402 0.4- 1.9+ 980318 402 0.3+ 0.9- 850120 691 0.0 0.0 971225 402 0.5+ 0.9+ 980318 360 0.4- 0.9- 850120 691 0.4- 0.4+ 971231 691 1.3- 0.7+ 980318 402 1.1- 1.7- 850121 657 0.1+ 1.3- 971231 691 (2.4- 0.1-) 980318 402 0.0 1.1- 850123 801 1.8+ 0.0 971231 691 (2.0- 0.1+) 980318 360 0.6- 1.2- 850214 657 0.4+ 1.2- 971231 867 0.4+ 0.3- 980319 428 1.2+ 0.8- 850215 691 0.8+ 0.2+ 971231 867 0.6- 0.7+ 980322 897 0.6+ 0.8- 850216 801 0.2+ 0.7+ 971231 867 0.7- 0.5+ 980322 897 (2.3+ 0.6+) 850216 502 (0.9- 3.9+) 1998/ 980322 118 0.1- 0.7+ 850217 984 (0.7+ 5.9-) 980102 867 0.1+ 0.8+ 980322 118 0.1- 0.2+ 850218 293 1.7+ 0.5- 980102 867 1.3+ 0.5+ 980322 118 0.2- 0.5+ 850223 993 (3.8+ 1.9+) 980110 118 0.6- 1.5- 980410 046 0.4+ 0.6- 850311 657 0.7+ 0.8+ 980110 118 0.1+ 1.4- 980410 046 0.5+ 0.1+ 850311 657 0.7+ 0.4+ 980111 046 0.5- 0.6- 980410 046 0.6+ 0.5- 850312 046 (4.8- 1.6-) 980111 046 0.5- 0.2+ 980419 402 0.9- 1.9- 850312 046 1.9- 0.6+ 980111 046 0.4- 1.2- 980419 402 1.3+ 0.8- 850313 657 0.5- 1.2+ 980118 954 0.0 0.3+ 980419 402 0.3+ 1.8- 850313 657 (3.1- 0.8+) 980118 954 0.1+ 0.3- 980419 360 0.5- 0.4- 850315 657 (3.0+ 0.7-) 980118 954 0.1+ 0.2- 980419 360 0.7- 0.7- 850315 657 1.6+ 1.9- 980118 954 0.4- 0.1- 980420 118 0.2+ 0.1- 850315 046 1.0- 0.3- 980118 954 0.2- 0.4- 980420 118 0.1- 0.1+ 850315 046 0.7- 0.3- 980118 954 0.2- 0.2- 980423 118 0.4+ 0.1+ 850316 046 (2.2+ 6.0+) 980118 954 0.5+ 0.2+ 980423 118 0.4+ 0.3+ 850316 046 (1.2- 4.0+) 980118 954 0.3- 0.4+ 980427 118 0.2+ 0.2- 850319 801 1.9- 2.5+ 980118 954 0.3- 0.0 980427 118 0.5+ 0.1- 850320 978 1.0- 1.5+ 980118 954 0.1+ 0.4- 980511 118 1.0+ 0.1- 850324 688 0.7- 0.7- 980118 954 0.1+ 0.5- 980511 118 0.8+ 0.7- 850324 688 1.6+ 0.6- 980118 954 0.2+ 0.4- 980515 118 0.0 0.5- 850325 801 2.0+ 1.4+ 980118 954 0.3+ 0.6- 980515 118 0.0 0.4- 850325 046 2.1- 1.4+ 980118 954 0.2- 0.0 980519 360 0.7+ 0.2- 850325 046 0.3+ 1.2+ 980118 954 0.2+ 0.3- 980519 360 0.6+ 0.0 850326 801 1.2+ 1.8+ 980118 954 0.3- 0.7- 980526 402 0.8+ 0.4- 850326 046 1.6- 0.3+ 980118 954 0.4+ 0.0 980526 402 0.9+ 0.2+ 850326 046 2.0- 1.0+ 980118 954 0.1- 0.0 980526 402 0.7+ 0.1+ 850411 046 (4.0- 2.7+) 980118 954 0.1- 0.2- 2004/ 850411 046 (5.5- 8.2+) 980118 954 0.0 0.2+ 040914 D74 1.2+ 1.3+ 850412 046 (1.8+ 3.1+) 980129 360 0.5+ 0.4+ 040914 D74 1.9+ 1.0+ 850412 046 (3.5- 5.6+) 980129 360 0.2+ 0.6+ 040914 D74 0.5- 1.5+ 850414 046 (6.9+ 0.3+) 980129 360 0.4+ 0.4+ 040917 704 1.1- 1.4+ 850414 046 (1.2+ 2.9+) 980205 118 0.7+ 0.3+ 040917 704 0.7- 0.6+ 850418 046 1.2- 2.3- 980205 118 0.9+ 0.3+ 040917 704 1.0- 0.9+ 850418 046 (8.0+ 2.0-) 980301 118 0.6- 0.0 040919 D74 0.7- 0.9+ 850421 801 1.3+ 1.0+ 980301 118 0.3- 0.0 040919 D74 (3.3- 1.1+) 1991/ 980302 897 0.3- 0.2+ 040919 D74 0.2+ 1.0+ 911108 372 1.5- 0.5- 980302 897 (2.3- 1.8+) 040920 I05 0.3- 0.4+ 911111 372 0.3+ 1.5- 980302 360 0.8- 0.2- 040920 I05 (2.8- 1.3+) 911111 372 0.0 0.7- 980302 360 0.7- 0.3- ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2004 Sept. 28

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