Nakano Note (Nakano wa Kangaeru noda) NK 2747 287P/Christensen

The following improved orbital elements, by S. Nakano, are from 143 observations 2006 to 2014. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.64 arc second. The residuals for recent June observations were +11" and -2" from a linked orbit in NK 2532 (= HICQ 2014). See the previous orbits in NK 1444, NK 2162 and NK 2532. Epoch = 2014 Dec. 9.0 TT T = 2014 Dec. 28.41656 +/- 0.00135 (m.e.) TT Peri. = 189.08219 +/- 0.00037 Node = 139.05748 +/- 0.00005 (2000.0) Inc. = 16.30027 +/- 0.00003 q = 3.0540620 +/- 0.0000080 AU e = 0.2692167 +/- 0.0000017 a = 4.1791623 +/- 0.0000036 AU n' = 0.11536398 +/- 0.00000015 P = 8.543 +/- 0.0000109 years T = 2006 June 15.08062 TT Epoch = 2006 July 4.0 TT Peri. = 188.84306 e = 0.2706691 Node = 139.15510 (2000.0) a = 4.1668405 AU Inc. = 16.31666 n'= 0.11587607 q = 3.0390056 AU P = 8.506 years The predicted orbit for the 2023 return is as follows: T = 2023 July 5.88282 TT Epoch = 2023 June 25.0 TT Peri. = 189.14178 e = 0.2711819 Node = 139.04000 (2000.0) a = 4.1631293 AU Inc. = 16.31977 n'= 0.11603105 q = 3.0341638 AU P = 8.494 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2006/ 060918 349 1.0- 1.0+ 061010 423 (1.7+ 2.6+) 060830 699 1.8- 1.1+ 060919 213 0.1- 0.8+ 061010 415 1.6+ 0.1- 060830 699 (2.0- 0.2-) 060919 213 0.0 0.7+ 061010 415 0.4+ 0.1- 060830 699 1.0- 0.2- 060919 213 0.0 0.8+ 061011 673 1.2+ 1.1- 060830 699 1.7- 1.5+ 060920 673 0.0 0.3- 061011 673 0.8+ 1.0- 060914 703 0.1+ 0.3- 060920 673 0.4+ 0.4- 061011 673 0.7+ 0.9- 060914 703 0.1+ 1.7- 060920 673 1.0+ 0.1- 061011 673 0.3+ 1.2- 060914 703 1.0- 1.2- 060920 703 0.4+ 0.2- 061011 423 0.6+ 1.5+ 060914 703 1.0+ 1.3- 060920 703 0.8+ 0.4+ 061011 423 0.1- 0.4+ 060914 703 0.3- 1.4- 060920 703 0.5- 0.7- 061012 423 0.2- 1.3+ 060914 703 0.1+ 0.4- 060920 703 0.2- 0.6+ 061012 423 1.2+ 1.1+ 060914 703 0.6- 0.6- 060921 215 0.4- 1.1- 061013 423 1.2+ 1.0+ 060914 703 0.5- 0.6- 060921 585 1.5+ 0.5+ 061013 423 0.7+ 0.2+ 060914 E12 0.2+ 0.2- 060921 585 1.2+ 0.8- 061018 423 0.6+ 1.9+ 060915 844 0.6- 0.9- 060921 585 (3.2- 0.2+) 061027 703 0.1+ 1.2+ 060915 844 1.3- 0.1+ 060921 585 0.9- 1.8- 061027 703 0.5+ 1.3+ 060915 844 0.9- 0.2- 060921 585 (2.7- 0.4+) 061027 703 0.2- 1.0+ 060915 844 0.5- 1.0- 060921 246 0.9+ 0.2+ 061029 415 0.5+ 0.1- 060915 I77 (2.4- 0.5-) 060921 246 0.0 0.8+ 061029 415 0.4+ 0.3- 060915 850 0.2- 0.9+ 060921 246 0.1- 0.9+ 061110 673 0.7+ 0.4- 060915 I77 0.4- 0.4+ 060921 246 0.0 1.3+ 061110 673 1.0+ 0.2- 060915 844 1.3- 0.1+ 060921 246 0.1+ 0.0 061110 673 0.8+ 0.1+ 060915 I77 0.0 0.7+ 060921 246 0.4+ 0.1- 061110 673 1.3+ 0.3+ 060915 850 0.4+ 0.1- 060923 349 0.4+ 0.5+ 061111 G96 0.9+ 1.1- 060915 850 1.3- 0.8+ 060923 349 0.4+ 0.4+ 061111 G96 1.1+ 0.9- 060915 854 0.6- 0.0 060923 349 0.7+ 0.6+ 061111 G96 0.7+ 0.9- 060915 854 0.4+ 1.1+ 060923 585 (2.8+ 1.1+) 061111 G96 0.1- 0.4- 060915 703 0.2- 0.2+ 060923 585 0.6- 1.1- 061112 130 (3.0+ 0.5-) 060915 703 0.3+ 0.3- 060923 585 0.3- 0.4+ 061115 215 (2.5+ 1.6+) 060915 703 0.1- 1.0- 060923 585 (0.7+ 2.0-) 061216 G96 1.6- 0.9- 060915 854 1.0- 0.3+ 060923 585 0.3- 0.4- 061216 G96 1.2+ 0.4- 060915 703 0.4- 1.0- 060924 608 0.1- 0.4- 2007/ 060915 423 0.7- 0.0 060924 608 0.3+ 0.4- 070108 G96 0.7+ 1.0- 060915 423 0.1+ 1.2+ 060924 608 0.6+ 0.7+ 070108 G96 0.3- 0.7- 060915 E12 0.3- 0.4+ 060924 423 0.1+ 0.0 070108 G96 0.0 0.2+ 060915 E12 1.0- 0.2- 060924 423 0.6+ 0.3+ 2013/ 060915 E12 0.7- 0.3+ 060925 415 0.5+ 0.3+ 130601 291 0.4+ 1.6+ 060915 E12 1.5- 0.2- 060925 415 0.6+ 0.0 130601 291 0.1+ 0.9+ 060915 E12 0.0 0.4+ 060926 703 0.4- 0.7+ 130601 291 0.4- 1.0+ 060915 E12 1.1- 0.2+ 060926 703 0.6- 1.7+ 130604 291 0.3+ 0.4+ 060915 E12 0.9- 0.5- 060926 703 0.0 0.7+ 130604 291 0.4+ 0.4+ 060915 E12 0.3+ 0.3+ 060926 703 0.8- 1.8+ 130604 291 0.7+ 0.7+ 060915 E12 0.7- 0.5+ 060927 423 0.3+ 0.6+ 2014/ 060915 E12 0.5- 0.7- 060927 423 0.3+ 0.1+ 140331 Q62 0.6- 0.3- 060916 415 0.0 0.9- 060927 204 0.3+ 0.2+ 140331 Q62 1.3- 0.3- 060916 415 0.8- 0.4- 060928 204 0.4+ 0.1+ 140331 Q62 (2.4- 0.5-) 060917 415 0.1+ 0.2+ 060928 423 0.5+ 0.4- 140507 F51 0.0 0.1+ 060917 415 0.1- 0.7- 060928 423 1.1+ 0.2+ 140507 F51 0.0 0.0 060917 213 0.4- 0.6- 061001 423 0.2- 0.3+ 140507 F51 0.0 0.1+ 060917 213 0.1+ 0.4- 061001 423 0.6+ 0.5- 140622 F51 0.0 0.2- 060917 213 0.3+ 0.3- 061007 585 0.7- 0.0 140622 F51 0.1+ 0.2- 060918 349 0.8- 0.8+ 061007 204 (2.2- 1.7+) 140622 F51 0.0 0.2- 060918 349 1.1- 0.6+ 061010 423 1.3+ 0.1- ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2014 July 10

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