OAA computing section circular NK 1049A 128P/Shoemaker-Holt 1 (Nucleus A)
The following improved orbital elements, by S. Nakano, are from 73 observations 1987 to 1996. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 1.05 arc seconds. Epoch = 1997 Nov. 8.0 TT T = 1997 Nov. 20.28004 +/- 0.01068 (m.e.) TT Peri. = 210.21542 +/- 0.00146 Node = 214.52684 +/- 0.00043 (2000.0) Inc. = 4.36141 +/- 0.00005 q = 3.0470352 +/- 0.0000026 AU e = 0.3212730 +/- 0.0000003 a = 4.4893384 +/- 0.0000010 AU n' = 0.10361689 +/- 0.00000003 P = 9.512 +/- 0.0000031 years T = 1988 May 21.34858 TT Epoch = 1988 June 8.0 TT Peri. = 210.35821 e = 0.3218508 Node = 214.57803 (2000.0) a = 4.5019174 AU Inc. = 4.36226 n'= 0.10318291 q = 3.0529719 AU P = 9.552 years The predicted orbit for the 2007 return is as follows: T = 2007 June 13.63612 TT Epoch = 2007 June 29.0 TT Peri. = 210.44442 e = 0.3198894 Node = 214.42010 (2000.0) a = 4.5123959 AU Inc. = 4.35514 n'= 0.10282371 q = 3.0689281 AU P = 9.585 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1987/ 871117 801 1.1- 1.8- 881217 897 (3.6- 2.0+) 870924 675 1.9- 0.1- 871120 372 1.1+ 0.6+ 881219 372 0.7+ 0.1- 870924 675 (2.6- 1.1+) 871120 372 1.8+ 0.8- 881219 372 0.2+ 0.8- 871002 095 0.9+ 0.9- 871122 897 0.6- 1.2+ 1989/ 871018 675 1.2- 1.8+ 871122 897 0.1- 0.7+ 890106 897 0.8+ 0.2+ 871019 675 0.8- 2.1+ 871123 675 0.4+ 0.4- 890106 897 2.1- 1.8- 871020 675 2.4- 1.6+ 871123 675 1.2+ 0.8- 890128 897 (1.8+ 3.4-) 871020 657 (2.9- 1.4-) 871124 691 0.1+ 0.2- 890128 897 2.4- 1.9+ 871021 657 1.3- 1.3- 871124 691 0.4- 0.4+ 890201 897 (4.6+ 0.4-) 871021 657 0.2- 1.9+ 871124 897 (2.5+ 2.3+) 890201 897 (4.2+ 1.9+) 871021 675 (2.6- 0.7+) 871124 897 (3.0+ 3.4+) 890202 887 1.7+ 0.6- 871021 372 1.0+ 0.1- 871125 046 1.6+ 0.7- 890202 887 1.1+ 0.3- 871021 372 (3.7+ 0.7+) 871125 046 2.3+ 1.2+ 890202 887 0.9+ 0.9- 871022 801 0.2- 0.2+ 871219 801 (3.0- 2.1+) 890206 897 (3.2- 1.9+) 871022 801 0.8+ 0.3+ 871221 026 2.3+ 1.1+ 890206 897 0.3- 1.0- 871023 801 0.2+ 0.2+ 871223 691 0.3- 0.2- 1996/ 871023 399 (3.1- 0.1-) 871223 691 0.4- 0.3- 960916 568 (8.6+ 2.8+) 871023 399 1.0- 0.7+ 871224 801 2.3- 0.3- 960916 568 2.1+ 1.1- 871024 801 0.3- 0.1- 1988/ 960916 568 1.0+ 2.1- 871026 691 0.4- 0.3+ 880120 381 0.4- 0.5- 960916 568 1.0+ 2.3- 871026 691 0.6- 0.2+ 880120 381 0.4- 0.3+ 960919 691 0.2+ 0.2- 871026 691 0.8- 0.1+ 880121 691 0.9+ 0.1+ 960919 691 0.8- 0.0 871027 372 (1.4- 6.1+) 880121 691 0.8+ 0.1+ 960919 691 0.5- 0.1+ 871027 372 (0.8- 8.2+) 880121 691 1.0+ 0.4+ 960920 691 0.4- 0.2- 871028 372 1.8+ 2.3- 880122 801 0.9- 0.6- 960920 691 0.0 0.8- 871028 372 (1.7- 2.7-) 880122 801 (2.9- 0.7-) 960920 691 0.5+ 0.4- 871114 046 1.2+ 0.7- 880218 675 0.6+ 0.8- 960921 691 0.2+ 0.2- 871114 046 0.7- 2.2+ 880219 675 0.2+ 0.9- 960921 691 0.4- 0.4- 871115 046 1.0- 0.9+ 881207 897 1.7- 0.7- 960921 691 0.4+ 0.7- 871115 046 0.9- 0.4+ 881211 877 2.4+ 0.9- 961204 691 0.5- 0.3- 871116 691 0.5- 0.1- 881211 877 (3.3+ 2.1+) 961204 691 0.1- 0.1+ 871116 691 0.3- 0.5+ 881217 897 2.2- 0.7+ 961204 691 0.0 0.5+ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2004 Apr. 7