OAA computing section circular NK 1552 195P/Hill (1993 D1 = 2006 W4)

The following improved orbital elements, by S. Nakano, are from 100 observations 1993 to 2007. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.61 arc second. See an orbit on YC 2535. Epoch = 2009 Jan. 9.0 TT T = 2009 Jan. 21.09138 +/- 0.00160 (m.e.) TT Peri. = 249.61839 +/- 0.00022 Node = 243.24960 +/- 0.00003 (2000.0) Inc. = 36.36179 +/- 0.00006 q = 4.4385834 +/- 0.0000064 AU e = 0.3148656 +/- 0.0000008 a = 6.4784131 +/- 0.0000019 AU n' = 0.05977246 +/- 0.00000003 P = 16.489 +/- 0.0000073 years T = 1992 June 21.66629 TT Epoch = 1992 June 27.0 TT Peri. = 247.58172 e = 0.3148577 Node = 243.45999 (2000.0) a = 6.4457247 AU Inc. = 36.29378 n'= 0.06022772 q = 4.4162389 AU P = 16.365 years The predicted orbit for the 2025 return is as follows: T = 2025 Aug. 5.83448 TT Epoch = 2025 July 24.0 TT Peri. = 250.61808 e = 0.3107987 Node = 243.09556 (2000.0) a = 6.4430334 AU Inc. = 36.41594 n'= 0.06026546 q = 4.4405472 AU P = 16.354 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1993/ 061123 854 0.6- 0.4+ 061215 246 0.6+ 0.4+ 930226 413 0.2- 0.0 061123 854 0.1+ 0.3- 061215 246 0.1+ 0.1- 930226 413 0.2+ 0.4+ 061123 143 0.2+ 0.1+ 061221 204 0.3- 0.3+ 1994/ 061123 143 0.1- 0.0 061222 204 0.3+ 0.9+ 940405 413 0.4- 0.6+ 061123 143 0.5- 0.0 061222 147 0.6- 0.4+ 940405 413 0.5+ 0.3+ 061123 235 0.1+ 0.0 061222 147 0.2+ 0.8+ 2006/ 061123 235 0.3- 0.6- 061226 130 (2.7+ 1.1-) 061119 704 0.5+ 0.6- 061123 J95 0.3+ 0.3- 061226 118 0.0 0.0 061119 704 0.0 0.1- 061123 J95 0.2+ 0.3- 061226 118 0.2+ 0.2+ 061119 704 0.8- 0.2+ 061123 J95 0.1+ 0.5- 061227 703 0.4+ 0.5+ 061122 704 1.8- 0.3+ 061124 349 0.2+ 1.0- 061227 703 0.1+ 0.7- 061122 703 0.7- 0.1+ 061124 349 0.3+ 1.3- 061227 703 1.8+ 0.6+ 061122 704 1.9- 0.4- 061124 349 0.5+ 1.5- 061227 703 0.7- 1.3+ 061122 703 0.5+ 0.4+ 061126 215 (3.1+ 1.3+) 2007/ 061122 704 0.9- 0.2+ 061127 204 0.7- 0.1- 070117 G96 0.8+ 0.3- 061122 703 0.1- 0.0 061127 204 0.2+ 0.5- 070117 G96 0.1+ 0.3- 061122 704 1.9- 1.3+ 061127 213 0.1+ 0.7+ 070117 G96 0.4+ 0.4- 061122 703 (2.7- 1.0+) 061127 213 0.3+ 0.6+ 070117 G96 0.3+ 0.1- 061122 704 (0.3+ 2.3+) 061127 213 0.2+ 0.7+ 070120 213 0.4+ 0.1- 061122 703 1.0+ 0.3- 061127 213 0.5+ 0.7+ 070120 213 0.6+ 0.2+ 061122 703 (2.5- 0.8+) 061201 673 0.1- 0.6+ 070120 213 0.6+ 0.1+ 061122 703 1.0- 0.5+ 061201 673 0.2- 0.4- 070915 704 0.2+ 0.6- 061122 703 0.6- 0.6- 061201 673 0.7+ 0.5- 070915 704 0.1+ 0.7- 061122 143 1.0+ 0.1+ 061201 673 0.1- 0.3- 070915 704 0.2+ 0.1- 061122 143 0.7- 0.5- 061214 703 1.4+ 1.0+ 071201 349 0.6- 0.2- 061122 470 (2.1+ 1.3-) 061214 703 1.8+ 0.0 071201 349 0.3- 0.5- 061122 470 0.8- 0.5+ 061214 703 0.8+ 0.1+ 071203 349 0.1- 0.3- 061122 470 (3.0- 1.2-) 061214 703 0.3- 0.8+ 071203 349 0.0 0.2- 061122 470 0.7- 1.0+ 061215 704 0.9- 0.9+ 071204 561 0.2+ 0.3- 061123 703 0.5- 0.2- 061215 704 0.7+ 1.0+ 071204 561 0.5+ 0.3- 061123 703 0.0 0.6- 061215 704 (2.3+ 0.1-) 071204 561 0.7+ 0.2- 061123 703 1.0- 0.3- 061215 G96 0.5+ 0.2- 071214 704 0.5+ 0.3- 061123 734 0.1- 0.8- 061215 G96 0.4- 0.0 071214 704 0.3- 0.2- 061123 703 0.5- 0.6- 061215 G96 0.2+ 0.3- 071214 704 0.6- 0.9+ 061123 734 0.2+ 0.4- 061215 G96 0.3+ 0.6- 071214 704 0.2- 0.2+ 061123 734 0.1+ 0.5- 061215 246 0.0 0.1- 071214 704 0.9- 0.3+ 061123 734 0.8+ 0.2- 061215 246 0.7+ 0.6+ 061123 854 0.7- 1.8+ 061215 246 0.4+ 0.2+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2007 Dec. 26

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