Nakano Note (Nakano wa Kangaeru noda) NK 1998 167P/CINEOS

The following improved orbital elements, by S. Nakano, are from 85 observations 2002 June 12 to 2009 Sept. 28. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.37 arc second. See the previous orbits in NK 1185, NK 1434 and NK 1850 (=HICQ 2009/ 2010). Epoch = 2001 May 11.0 TT T = 2001 Apr. 24.10635 +/- 0.06640 (m.e.) TT Peri. = 344.04508 +/- 0.00187 Node = 295.84360 +/- 0.00005 (2000.0) Inc. = 19.12969 +/- 0.00003 q = 11.7881577 +/- 0.0000768 AU e = 0.2691585 +/- 0.0000130 a = 16.1295678 +/- 0.0000189 AU n' = 0.01521493 +/- 0.00000003 P = 64.779 +/- 0.0001139 years (+/- 0.04 day) The predicted orbit for the 2066 return is as follows: T = 2066 Mar. 21.66032 TT Epoch = 2066 Mar. 11.0 TT Peri. = 343.48419 e = 0.2770412 Node = 295.57962 (2000.0) a = 16.2771570 AU Inc. = 19.05272 n'= 0.01500846 q = 11.7677145 AU P = 65.670 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2002/ 040811 599 0.6+ 0.1- 060916 691 0.4- 0.1- 020612 644 0.1- 0.2- 040811 621 0.4+ 0.2- 060916 691 0.0 0.5+ 020612 644 0.6+ 0.3+ 040811 621 0.1- 0.2- 060916 691 0.0 0.0 020612 644 0.1+ 0.3- 040811 246 0.2+ 0.9- 061014 461 0.2+ 0.5+ 020617 644 0.0 0.5+ 040811 246 0.4+ 0.3- 061014 461 0.1+ 0.2+ 020629 644 0.3+ 0.1- 040811 246 0.5+ 0.5+ 061014 461 0.1+ 0.3+ 020629 644 0.5- 0.4+ 040811 246 0.2+ 0.1- 061017 461 0.9- 0.4+ 020712 644 0.1+ 0.3+ 040812 673 0.2- 0.1+ 061017 461 0.4- 0.1+ 020712 644 0.2+ 0.1- 040812 673 0.0 0.1+ 2007/ 020712 644 0.2- 0.0 040812 673 0.4+ 0.2+ 070721 461 0.7+ 0.2- 020714 644 0.2- 0.4+ 040812 673 0.2+ 0.0 070722 461 0.3+ 0.3- 020715 644 0.2- 0.1+ 040813 599 1.0+ 0.6+ 070908 204 0.1- 0.6+ 020719 644 0.3- 0.3+ 040912 291 0.2- 0.4- 070908 204 0.4- 0.0 020719 644 0.0 0.1+ 040912 291 0.1- 0.1- 070909 204 0.3+ 0.6- 020719 644 0.1- 0.2+ 040912 291 0.2- 0.0 2008/ 020829 644 0.2- 0.0 040913 291 0.3- 0.0 080824 461 0.1+ 0.0 2003/ 040913 291 0.0 0.1+ 080824 461 0.6+ 0.4+ 030529 291 0.7- 0.2- 040913 291 0.2- 0.2+ 080826 461 0.1+ 0.2- 030529 291 0.5- 0.5- 2005/ 080826 461 0.1- 0.3- 030529 291 0.3- 0.2- 050607 290 0.1+ 0.4- 080927 215 0.4- 0.5- 2004/ 050607 290 0.0 0.2- 081003 B37 (6.8- 10.7-) 040810 599 0.2+ 0.1+ 050608 290 0.0 0.2- 081003 B37 (2.3+ 6.7-) 040810 599 0.3+ 0.2+ 050608 290 0.2- 0.3- 081003 B37 (4.4+ 6.6-) 040810 599 0.0 0.2+ 050617 291 0.3- 0.1+ 081119 204 0.3- 0.7+ 040810 599 0.1+ 0.2- 050617 291 0.0 0.1- 081219 204 0.5+ 0.7- 040810 599 0.3+ 0.0 050731 599 0.0 0.6- 2009/ 040810 599 0.1+ 0.2+ 050731 599 0.4- 0.2- 090915 461 0.9+ 0.3+ 040811 176 1.2- 0.9- 050731 599 0.0 0.1- 090920 B42 0.2+ 0.4- 040811 599 0.2+ 0.3+ 050731 599 0.9+ 0.3- 090926 B37 0.1- 0.6+ 040811 599 0.1- 0.2- 2006/ 090926 B37 1.0- 0.3+ 040811 599 0.3+ 0.3+ 060817 461 0.0 0.1+ 090926 B37 1.0- 0.5- 040811 176 0.7+ 0.1+ 060817 461 0.4- 0.1- 090928 204 0.1+ 0.6+ ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2010 Oct. 13

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