OAA computing section circular NK 789 121P/Shoemaker-Holt 2

The following improved orbital elements, by S. Nakano, are from 187 observations 1989-1998. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.75 arc second. Epoch = 1996 Aug. 25.0 TT T = 1996 Aug. 20.04640 +/- 0.00096 (m.e.) TT Peri. = 6.12718 +/- 0.00022 Node = 99.71993 +/- 0.00010 (2000.0) Inc. = 17.69677 +/- 0.00002 q = 2.6643025 +/- 0.0000009 AU e = 0.3367281 +/- 0.0000002 a = 4.0169086 +/- 0.0000005 AU n' = 0.12242388 +/- 0.00000002 P = 8.051 +/- 0.0000015 years T = 1988 Aug. 7.79267 TT Epoch = 1988 Aug. 27.0 TT Peri. = 6.03167 e = 0.3389531 Node = 99.75944 (2000.0) a = 4.0041577 AU Inc. = 17.72340 n'= 0.12300912 q = 2.6469359 AU P = 8.012 years The predicted orbit for the 2004 return is as follows: T = 2004 Sept. 1.71355 TT Epoch = 2004 Aug. 23.0 TT Peri. = 6.22971 e = 0.3384588 Node = 99.66997 (2000.0) a = 4.0029551 AU Inc. = 17.71772 n'= 0.12306456 q = 2.6481196 AU P = 8.009 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1989/ 951121 360 0.2- 0.1- 970113 900 0.1+ 0.1+ 890304 026 0.4- 1.0- 951121 360 0.6- 0.3+ 970113 360 1.1+ 0.2+ 890309 675 1.0+ 1.7- 951217 360 0.5- 0.3- 970113 360 1.1+ 0.2+ 890309 675 1.3+ 0.1- 951217 360 0.3- 0.3+ 970116 691 0.4+ 0.2+ 890310 801 0.6+ 1.3+ 951217 360 0.2- 0.4+ 970116 691 0.3+ 0.1+ 890310 675 (3.1+ 2.6-) 1996/ 970116 402 1.1+ 0.1+ 890310 801 0.3+ 1.5+ 960219 360 0.0 0.9+ 970116 402 1.4+ 0.4- 890311 010 (0.3- 2.8+) 960219 360 0.6- 0.4+ 970129 900 0.2+ 0.3+ 890311 801 1.0+ 2.4+ 960219 360 0.6+ 1.0+ 970129 900 0.6+ 0.2- 890311 887 1.2+ 0.4- 961004 118 0.2- 0.1- 970131 360 0.7+ 0.6+ 890311 887 0.2- 0.6+ 961004 118 0.4- 0.1- 970131 360 0.7+ 0.4+ 890311 372 1.8- 0.9+ 961004 118 0.5- 0.5- 970201 355 1.1- 1.0- 890311 887 0.5+ 0.3+ 961020 360 0.3+ 0.0 970201 355 0.8- 0.4+ 890311 405 1.3+ 0.2+ 961020 360 0.1+ 0.2- 970207 017 0.2+ 0.9+ 890311 887 0.3+ 0.8+ 961020 360 0.0 0.1- 970207 017 0.2+ 0.9+ 890311 372 1.4- 1.4+ 961106 360 0.5- 0.0 970207 017 0.3+ 1.0+ 890311 405 (2.5+ 0.6-) 961106 360 0.4- 0.2- 970214 605 0.3- 1.1+ 890311 405 2.2+ 0.3+ 961113 897 0.6- 0.4- 970214 605 1.5- 1.2- 890311 402 (2.0+ 7.2+) 961113 897 1.1- 0.3- 970214 605 0.2- 0.4- 890311 402 (0.3+ 8.4+) 961113 897 0.7- 0.7- 970220 118 0.3- 0.2+ 890311 391 (0.6- 4.5-) 961113 360 0.0 0.5- 970220 118 0.2- 0.2+ 890311 391 (0.9- 6.6-) 961113 360 0.3+ 0.8- 970220 118 0.5- 0.2+ 890312 413 0.5- 0.4- 961113 867 1.0- 0.8- 970220 118 0.4- 0.1- 890314 892 (3.8- 2.6+) 961113 867 1.0- 0.6- 970301 360 0.2+ 0.8+ 890314 892 (2.3- 2.6+) 961119 691 1.0- 0.0 970301 360 0.1+ 0.9+ 890314 372 1.5- 0.5- 961130 897 0.6- 0.4- 970303 118 0.2- 0.0 890315 892 1.7- 2.3+ 961130 897 0.3+ 0.5- 970303 118 0.1+ 0.1+ 890315 892 (4.5- 1.2+) 961202 118 0.2+ 0.1- 970303 118 0.2- 0.0 890315 892 (0.1+ 4.0+) 961202 118 0.6+ 0.4- 970305 897 0.8- 0.0 890315 897 2.1+ 0.8- 961207 900 1.3- 0.3+ 970305 897 0.3- 0.3- 890315 897 0.1+ 0.1+ 961207 900 1.5- 0.2+ 970305 118 0.4- 0.3+ 890326 400 1.4- 0.2+ 961207 897 0.3- 0.2+ 970305 118 0.2- 0.5+ 890326 400 0.9+ 2.2- 961207 897 0.3- 0.2+ 970311 360 0.1+ 0.3+ 890326 046 0.5+ 0.4- 961214 896 0.4- 0.5- 970311 360 0.1+ 0.4+ 890326 046 0.6- 0.3+ 961214 896 0.8+ 0.8- 970317 118 0.0 0.8- 890327 400 0.8+ 1.4- 961218 691 (7.4- 1.4+) 970317 118 0.1+ 0.9- 890327 046 0.2+ 0.4- 961218 691 (6.1- 0.4+) 970331 360 0.3+ 0.4+ 890327 046 0.1+ 0.2+ 961218 691 (4.2- 0.4-) 970331 360 0.4+ 0.7+ 890329 897 0.3+ 0.9- 961218 372 0.6- 1.1- 970331 605 0.8+ 0.0 890329 897 0.2- 0.3- 961218 372 0.0 0.8- 970331 605 0.1+ 0.3+ 890330 046 1.9- 1.3- 961218 372 0.4- 0.1+ 970331 605 0.3- 0.1- 890330 046 1.2+ 0.2+ 961219 900 0.4- 0.1- 970403 118 0.4- 0.2+ 890330 046 0.7- 1.0- 961220 355 0.6- 0.2+ 970403 118 0.0 0.1+ 890403 801 0.5- 0.6+ 961220 355 1.0- 0.1+ 970403 118 0.1+ 0.6+ 890407 046 1.3- 1.8- 961221 402 1.0+ 0.2+ 970403 118 0.2+ 0.9+ 890407 046 0.7- 0.2- 961221 402 1.8+ 0.8+ 970412 352 0.9- 1.2- 890409 046 0.7- 0.6- 961221 402 0.8+ 0.0 970412 352 0.1- 1.7- 890409 046 0.1+ 1.3- 961221 372 1.2+ 1.3+ 970420 605 (2.6+ 5.5+) 890423 046 1.0- 0.5- 961222 046 0.5+ 0.4- 970420 605 (2.5- 0.4+) 890423 046 (2.8+ 3.1-) 961222 046 1.0+ 0.3- 970424 118 (3.2+ 1.1+) 890423 046 (2.7- 3.8+) 961222 046 0.4+ 0.0 970424 118 (2.9+ 1.6+) 890423 046 1.1+ 1.2+ 961228 118 0.0 0.8+ 970424 118 (2.9+ 1.4+) 890424 046 0.5- 1.0+ 961228 118 0.2+ 0.4+ 970425 352 1.7- 0.2+ 890424 046 0.6- 0.4+ 1997/ 970425 352 0.3- 1.5+ 890502 373 0.7+ 1.2+ 970102 355 0.2- 0.1- 970429 360 0.7- 0.5+ 890502 046 (2.4- 4.5+) 970102 355 0.7- 0.4- 970429 360 0.1- 0.7+ 890502 046 (0.3- 2.5+) 970102 897 0.3+ 0.3- 970501 046 0.4+ 0.2- 890504 801 (0.4+ 3.3+) 970102 897 0.3+ 0.3- 970501 046 0.2- 0.4+ 890505 046 1.7- 0.3- 970107 900 0.4- 0.6- 970501 046 0.3+ 0.0 890505 046 0.9- 0.7- 970107 900 1.1- 0.1+ 970517 118 0.5- 0.5- 890507 046 0.4+ 2.3- 970110 355 0.0 0.3- 970517 118 0.8- 0.6- 890507 046 0.8+ 0.5- 970110 355 0.0 0.2+ 970526 360 0.2+ 0.3- 890529 293(16.7- 8.1-) 970110 897 0.0 0.3+ 970526 360 0.1+ 0.3- 1995/ 970110 897 0.1+ 0.0 970527 897 0.7+ 0.9- 950829 691 0.5+ 0.3+ 970111 360 0.9+ 0.5+ 970527 897 0.0 1.7- 950829 691 0.3+ 0.0 970111 360 0.8+ 0.6+ 970615 118 2.1+ 0.4- 950831 691 0.4+ 0.3+ 970112 124 0.5- 0.2- 970615 118 1.9+ 0.9- 950831 691 0.3+ 0.2+ 970112 124 0.0 0.4- 970703 360 0.8+ 0.5+ 950831 691 1.1+ 0.1- 970112 124 0.2- 0.2+ 970703 360 0.9+ 0.1- 951116 360 0.1+ 0.5- 970112 124 0.4- 0.4- 1998/ 951116 360 0.4+ 0.4- 970112 867 1.6+ 0.8+ 980329 504 1.0- 1.9+ 951116 360 0.1+ 0.7- 970112 867 0.7+ 0.1+ 951121 360 0.6- 0.1- 970113 900 0.3+ 0.1- ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2001 Apr. 28

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