Nakano Note (Nakano wa Kangaeru noda) NK 1850 167P/CINEOS

The following improved orbital elements, by S. Nakano, are from 79 observations 2002 June 12 to 2008 Dec. 19. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.35 arc second. The comet will pass 1.64 AU from Uranus on 2039 June 1.3 UT. See the previous orbits in NK 1185 and NK 1434. Epoch = 2001 May 11.0 TT T = 2001 Apr. 24.11214 +/- 0.06510 (m.e.) TT Peri. = 344.04527 +/- 0.00183 Node = 295.84358 +/- 0.00005 (2000.0) Inc. = 19.12965 +/- 0.00004 q = 11.7881636 +/- 0.0000764 AU e = 0.2691592 +/- 0.0000138 a = 16.1295911 +/- 0.0000200 AU n' = 0.01521490 +/- 0.00000003 P = 64.779 +/- 0.0001206 years (+/- 0.04 day) The predicted orbit for the 2066 return is as follows: T = 2066 Mar. 21.71829 TT Epoch = 2066 Mar. 11.0 TT Peri. = 343.48434 e = 0.2770417 Node = 295.57960 (2000.0) a = 16.2771843 AU Inc. = 19.05269 n'= 0.01500843 q = 11.7677256 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 0.3+ 0.3+ 050731 599 0.9+ 0.3- 020612 644 0.1- 0.2- 040811 176 0.7+ 0.1+ 2006/ 020612 644 0.6+ 0.3+ 040811 599 0.6+ 0.1- 060817 461 0.0 0.1+ 020612 644 0.1+ 0.4- 040811 621 0.4+ 0.1- 060817 461 0.4- 0.0 020617 644 0.1+ 0.4+ 040811 621 0.1- 0.1- 060916 691 0.4- 0.0 020629 644 0.3+ 0.2- 040811 246 0.2+ 0.9- 060916 691 0.0 0.5+ 020629 644 0.5- 0.3+ 040811 246 0.4+ 0.3- 060916 691 0.1- 0.1+ 020712 644 0.1+ 0.2+ 040811 246 0.5+ 0.5+ 061014 461 0.1+ 0.5+ 020712 644 0.2+ 0.1- 040811 246 0.2+ 0.0 061014 461 0.1+ 0.2+ 020712 644 0.1- 0.0 040812 673 0.2- 0.1+ 061014 461 0.0 0.4+ 020714 644 0.1- 0.4+ 040812 673 0.0 0.1+ 061017 461 1.0- 0.4+ 020715 644 0.2- 0.1+ 040812 673 0.4+ 0.2+ 061017 461 0.5- 0.1+ 020719 644 0.3- 0.3+ 040812 673 0.2+ 0.0 2007/ 020719 644 0.0 0.1+ 040813 599 1.0+ 0.6+ 070721 461 0.7+ 0.1- 020719 644 0.1- 0.1+ 040912 291 0.2- 0.4- 070722 461 0.2+ 0.2- 020829 644 0.2- 0.1- 040912 291 0.2- 0.1- 070908 204 0.1- 0.6+ 2003/ 040912 291 0.2- 0.0 070908 204 0.4- 0.1+ 030529 291 0.7- 0.3- 040913 291 0.3- 0.0 070909 204 0.2+ 0.5- 030529 291 0.5- 0.5- 040913 291 0.0 0.1+ 2008/ 030529 291 0.3- 0.3- 040913 291 0.2- 0.2+ 080824 461 0.1+ 0.1+ 2004/ 2005/ 080824 461 0.6+ 0.4+ 040810 599 0.2+ 0.1+ 050607 290 0.1+ 0.3- 080826 461 0.1+ 0.2- 040810 599 0.3+ 0.2+ 050607 290 0.0 0.2- 080826 461 0.2- 0.2- 040810 599 0.0 0.2+ 050608 290 0.0 0.2- 080927 215 0.5- 0.4- 040810 599 0.1+ 0.2- 050608 290 0.2- 0.3- 081003 B37 (6.8- 10.6-) 040810 599 0.3+ 0.1+ 050617 291 0.3- 0.1+ 081003 B37 (2.2+ 6.6-) 040810 599 0.1+ 0.2+ 050617 291 0.0 0.1- 081003 B37 (4.3+ 6.6-) 040811 176 1.2- 0.9- 050731 599 0.0 0.6- 081119 204 0.4- 0.7+ 040811 599 0.2+ 0.3+ 050731 599 0.4- 0.2- 081219 204 0.5+ 0.7- 040811 599 0.1- 0.2- 050731 599 0.1- 0.0 ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2009 Sept. 16

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