OAA computing section circular NK 1669 P/2007 A2 (Christensen) = 2006 WY182
The following improved orbital elements, by S. Nakano, are from 97 observations 2006 Nov. 24 to 2007 Mar. 17. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.58 arc second. See orbits on YC 2543 and HICQ 2007. Epoch = 2007 Jan. 20.0 TT T = 2007 Jan. 17.90140 +/- 0.00907 (m.e.) TT Peri. = 186.98485 +/- 0.00237 Node = 301.04547 +/- 0.00014 (2000.0) Inc. = 26.49161 +/- 0.00042 q = 2.7963947 +/- 0.0000271 AU e = 0.5585566 +/- 0.0000123 a = 6.3346613 +/- 0.0000295 AU n' = 0.06181857 +/- 0.00000043 P = 15.944 +/- 0.0001114 years (+/- 0.04 day) The predicted orbit for the 2022 return is as follows: T = 2022 Nov. 28.86821 TT Epoch = 2022 Dec. 7.0 TT Peri. = 186.69771 e = 0.5584434 Node = 300.91318 (2000.0) a = 6.3380616 AU Inc. = 26.48446 n'= 0.06176883 q = 2.7986127 AU P = 15.956 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2006/ 070113 176 0.2- 0.1+ 070125 703 1.3- 0.4- 061124 G96 0.3+ 0.2+ 070113 176 0.3- 0.2+ 070125 703 1.0- 0.2- 061124 G96 0.4+ 0.2- 070113 215 1.7+ 0.8- 070203 J95 0.3+ 0.6- 061124 G96 0.3+ 0.2- 070113 A13 0.7- 0.0 070204 J95 0.1- 0.3- 061124 G96 0.2- 0.1+ 070113 A13 1.3- 0.0 070205 104 0.2- 1.3- 061125 G96 0.2+ 0.4- 070113 A13 1.2- 1.1- 070205 104 0.9- 1.6+ 061125 G96 0.7- 0.2+ 070113 213 0.5- 0.1+ 070205 104 0.1+ 0.4+ 061125 G96 0.0 0.4- 070114 213 0.5- 0.1+ 070208 673 0.1+ 0.2- 061125 G96 0.2- 0.3- 070114 213 0.8- 0.0 070208 673 0.5- 0.0 2007/ 070114 232 0.6- 1.4+ 070208 673 0.0 0.2+ 070110 G96 0.6+ 0.4- 070114 232 1.0- 1.1+ 070208 673 0.1+ 0.3- 070110 G96 0.4+ 0.3- 070114 232 0.4- 0.8+ 070210 213 0.3- 0.2+ 070110 G96 0.2+ 0.2- 070114 372 0.3+ 0.8+ 070210 213 0.1- 0.5+ 070110 G96 0.4+ 0.3- 070114 349 0.6+ 0.2- 070210 213 0.3- 0.0 070110 G96 0.5+ 0.2- 070114 349 0.7+ 0.2- 070215 215 0.6+ 0.3- 070110 G96 0.6+ 0.2- 070114 372 0.6+ 0.1- 070216 104 0.4- 1.8+ 070110 G96 0.2+ 0.3- 070114 349 0.4+ 0.3- 070216 104 0.0 0.2- 070110 G96 0.0 0.1- 070115 246 1.2+ 1.0+ 070216 104 0.8+ 0.1- 070110 G96 0.2+ 0.3- 070115 246 0.3- 1.4+ 070217 703 0.5- 0.4+ 070110 G96 0.6+ 0.4- 070115 246 0.3+ 0.4+ 070217 703 0.2+ 0.4+ 070110 G96 0.4+ 0.0 070115 246 0.2- 0.7+ 070217 703 0.1- 0.2- 070110 G96 0.5+ 0.0 070117 683 0.1- 0.2+ 070217 703 0.1- 1.4+ 070112 J95 0.2- 0.1- 070117 683 1.0+ 1.8- 070223 213 0.1+ 1.0- 070112 J95 0.8+ 0.3+ 070117 683 0.2- 1.2- 070223 213 0.3+ 0.9- 070112 J95 0.3- 0.4- 070118 372 1.3- 0.6- 070223 213 0.5+ 0.9- 070112 J87 0.7+ 0.2+ 070119 213 0.5+ 0.3- 070313 213 0.0 0.0 070112 J87 0.1+ 0.5- 070119 213 0.5+ 0.4- 070313 213 0.1- 0.1+ 070112 J87 0.0 0.7+ 070119 213 0.5+ 0.4- 070313 213 0.1- 0.0 070112 A13(10.0+ 0.4-) 070119 130 0.2- 0.2+ 070317 170 0.5+ 0.5- 070112 A13 0.3+ 0.6+ 070120 130 0.8+ 0.6+ 070317 170 0.4+ 0.4- 070112 A13 0.6- 0.1- 070120 204 0.1+ 0.1- 070317 170 0.1+ 0.1- 070113 176 0.1- 0.0 070120 204 0.4- 0.4+ 070317 170 0.2+ 0.1+ 070113 176 0.2- 0.1+ 070125 703 1.1- 0.8+ 070113 176 0.2- 0.1+ 070125 703 0.9- 0.3+ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2008 Sept. 6