OAA computing section circular NK 1185 167P/CINEOS (2004 PY42)

The following improved orbital elements, by S. Nakano, are from 51 observations 2002 June 12 to 2005 June 17. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.32 arc second. Epoch = 2001 May 11.0 TT T = 2001 Apr. 24.21510 +/- 0.12862 (m.e.) TT Peri. = 344.04817 +/- 0.00362 Node = 295.84354 +/- 0.00005 (2000.0) Inc. = 19.12958 +/- 0.00007 q = 11.7882861 +/- 0.0001199 AU e = 0.2691848 +/- 0.0000188 a = 16.1303235 +/- 0.0000277 AU n' = 0.01521386 +/- 0.00000004 P = 64.784 +/- 0.0001667 years (+/- 0.06 day) The predicted orbit for the 2066 return is as follows: T = 2066 Mar. 23.47142 TT Epoch = 2066 Mar. 11.0 TT Peri. = 343.48605 e = 0.2770615 Node = 295.57973 (2000.0) a = 16.2780602 AU Inc. = 19.05278 n'= 0.01500721 q = 11.7680368 AU P = 65.676 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2002/ 040810 599 0.1+ 0.1+ 040812 673 0.1- 0.2+ 020612 644 0.0 0.2- 040810 599 0.2+ 0.2+ 040812 673 0.3+ 0.2+ 020612 644 0.7+ 0.3+ 040810 599 0.1- 0.2+ 040812 673 0.1+ 0.1+ 020612 644 0.2+ 0.4- 040810 599 0.0 0.2- 040813 599 0.9+ 0.7+ 020617 644 0.1+ 0.4+ 040810 599 0.2+ 0.1+ 040912 291 0.4- 0.4- 020712 644 0.1+ 0.2+ 040810 599 0.1+ 0.3+ 040912 291 0.3- 0.1- 020712 644 0.3+ 0.2- 040811 176 1.2- 0.9- 040912 291 0.4- 0.0 020712 644 0.1- 0.1- 040811 599 0.1+ 0.4+ 040913 291 0.4- 0.0 020714 644 0.1- 0.3+ 040811 599 0.2- 0.1- 040913 291 0.2- 0.1+ 020715 644 0.2- 0.0 040811 599 0.2+ 0.4+ 040913 291 0.3- 0.2+ 020719 644 0.3- 0.2+ 040811 176 0.7+ 0.1+ 2005/ 020719 644 0.0 0.0 040811 599 0.5+ 0.0 050607 290 0.1+ 0.3- 020719 644 0.1- 0.1+ 040811 621 0.3+ 0.1- 050607 290 0.0 0.1- 020829 644 0.3- 0.1- 040811 621 0.2- 0.1- 050608 290 0.0 0.1- 2003/ 040811 246 0.1+ 0.9- 050608 290 0.2- 0.2- 030529 291 0.6- 0.2- 040811 246 0.3+ 0.2- 050617 291 0.3- 0.2+ 030529 291 0.3- 0.5- 040811 246 0.4+ 0.5+ 050617 291 0.0 0.0 030529 291 0.2- 0.2- 040811 246 0.1+ 0.0 2004/ 040812 673 0.2- 0.2+ ( ) -------- Rejected Obs.

Director, Computing Section Late edition Syuichi Nakano 2005 June 18

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