Nakano Note (Nakano wa Kangaeru noda) NK 2849 245P/WISE

The following improved orbital elements, by T. Kobayashi, are from 74 observations 2002 to 2010. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.48 arc second. See the previous orbit in NK 1971 (= HICQ 2010). Epoch = 2010 Feb. 13.0 TT T = 2010 Feb. 4.57167 +/- 0.00078 (m.e.) TT Peri. = 316.41991 +/- 0.00058 Node = 318.52834 +/- 0.00017 (2000.0) Inc. = 21.08937 +/- 0.00015 q = 2.1395459 +/- 0.0000193 AU e = 0.4661024 +/- 0.0000048 a = 4.0074089 +/- 0.0000509 AU n' = 0.12285946 +/- 0.00000232 P = 8.022 +/- 0.0001530 years (+/- 0.06 day) T = 2002 Jan. 19.70424 TT Epoch = 2002 Jan. 6.0 TT Peri. = 316.31587 e = 0.4652950 Node = 318.60252 (2000.0) a = 4.0189186 AU Inc. = 21.05933 n'= 0.12233205 q = 2.1489358 AU P = 8.057 years The predicted orbit for the 2018 return is as follows: T = 2018 Feb. 8.64966 TT Epoch = 2018 Feb. 11.0 TT Peri. = 316.67871 e = 0.4577583 Node = 316.68006 (2000.0) a = 4.0390693 AU Inc. = 21.20125 n'= 0.12141773 q = 2.1901519 AU P = 8.117 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2002/ 100606 C51 0.4- 1.4- 100714 474 0.3+ 0.5- 020827 644 0.4+ 0.1- 100606 C51 0.2- 0.4- 100714 474 0.2- 0.1+ 020827 644 0.3- 0.4+ 100606 C51 0.1- 0.3+ 100714 474 0.1+ 0.5+ 020827 644 0.6+ 0.1+ 100606 C51 (0.2+ 3.1+) 100716 204 0.5- 0.6- 020904 644 0.4+ 0.3- 100606 291 0.3- 0.1- 100716 204 0.1- 0.0 020904 644 0.0 0.7- 100606 291 0.3- 0.1+ 100903 G96 0.1+ 0.4+ 020904 644 0.1- 0.4- 100606 291 0.5+ 0.2- 100903 G96 0.3+ 0.1- 020911 644 0.1- 0.2+ 100606 C51 0.7+ 0.3- 100903 G96 0.1- 0.1+ 020911 644 0.1- 0.6+ 100606 C51 1.4- 1.2+ 100903 G96 0.1+ 0.1- 020911 644 0.5+ 0.0 100606 C51 0.2+ 0.1+ 100908 372 0.4- 0.1+ 020912 644 0.4- 0.4- 100606 C51 0.1+ 0.5- 100908 372 0.7- 0.3+ 020912 644 0.2- 0.3+ 100606 C51 0.6- 0.5- 100908 372 0.0 0.4+ 020912 644 0.4- 0.1- 100607 F65 1.0- 0.3- 100908 152 (1.9- 2.4+) 2010/ 100607 F65 0.7- 0.1+ 100908 152 (2.1+ 2.7-) 100602 C51 0.1+ 0.4- 100607 F65 0.1+ 0.2+ 100909 372 0.1- 0.1+ 100602 C51 (0.9+ 2.1+) 100608 695 0.2+ 0.3- 100909 372 0.3- 0.3- 100602 C51 0.2+ 0.1+ 100608 291 0.8- 0.2+ 100912 J01 0.4+ 0.5+ 100602 C51 1.0+ 0.4- 100608 695 0.5- 0.3- 100912 J01 0.3+ 0.1+ 100602 C51 0.0 0.4+ 100608 695 0.6- 0.3+ 100912 J01 0.3+ 0.1+ 100603 C51 0.3- 0.7- 100608 291 0.1- 0.5+ 100913 474 0.1+ 0.0 100603 C51 0.7+ 0.8+ 100608 291 0.8+ 0.3+ 100913 474 1.5+ 1.0- 100603 C51 1.8+ 1.5- 100713 474 0.1- 0.1+ 100913 474 0.1- 0.3+ 100603 C51 (0.5- 2.1-) 100713 474 0.2- 0.2+ 100913 474 0.0 0.6+ 100603 C51 0.8+ 0.2+ 100713 474 0.1+ 0.3+ 100913 J01 0.3- 0.1+ 100603 C51 0.1+ 0.2+ 100713 474 0.0 0.2+ 100913 J01 0.4- 0.1+ 100605 C51 0.5+ 0.6+ 100713 474 0.7- 0.2- 100913 J01 0.4- 0.3- 100605 C51 0.3+ 0.6+ 100714 474 0.0 0.4+ 101011 215 0.1+ 1.0- ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2015 Apr. 2

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