Nakano Note (Nakano wa Kangaeru noda) NK 2612 P/2012 TK8 (Tenagra)
The following improved orbital elements, by S. Nakano, are from 60 observations 2012 Oct. 6 to 2013 Dec. 30. 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. 2013 December observations show the residuals of +48" (R. A.) and -12" (Decl.) from an orbit in NK 2456 (= HICQ 2013). Epoch = 2013 May 28.0 TT T = 2013 May 10.57945 +/- 0.00462 (m.e.) TT Peri. = 128.20844 +/- 0.00090 Node = 289.72352 +/- 0.00025 (2000.0) Inc. = 6.29552 +/- 0.00001 q = 3.0909740 +/- 0.0000039 AU e = 0.2621127 +/- 0.0000071 a = 4.1889511 +/- 0.0000098 AU n' = 0.11495984 +/- 0.00000040 P = 8.573 +/- 0.0000300 years The predicted orbit for the 2021 return is as follows: T = 2021 Oct. 26.07743 TT Epoch = 2021 Nov. 2.0 TT Peri. = 128.03522 e = 0.2742759 Node = 288.96467 (2000.0) a = 4.1274103 AU Inc. = 6.34013 n'= 0.11754052 q = 2.9953612 AU P = 8.385 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2012/ 121020 H06 0.1- 0.1- 121104 F51 0.1- 0.0 121006 926 0.2+ 0.2+ 121020 H06 0.1- 0.4- 121104 F51 0.1- 0.1+ 121006 926 0.1+ 0.0 121020 H06 0.1+ 0.3- 121104 F51 0.1- 0.0 121006 926 0.0 0.3+ 121020 A71 0.7- 0.0 121107 215 0.7+ 0.5- 121008 G96 0.5- 0.3- 121020 A71 1.0- 0.9- 121107 215 1.1+ 0.5- 121008 G96 0.4- 0.1- 121020 246 0.5+ 0.7+ 121107 215 1.5+ 0.4- 121008 G96 0.1- 0.2- 121020 246 0.1+ 1.0+ 121117 C32 0.2+ 0.4+ 121008 G96 0.4- 0.3- 121020 246 0.1+ 0.8+ 121117 C32 0.1- 0.6+ 121009 F51 0.0 0.0 121020 246 0.1- 1.2- 121117 C32 0.6- 0.2+ 121009 F51 0.1+ 0.1+ 121020 246 0.0 0.2- 121125 C10 (5.3+ 1.3+) 121009 F51 0.0 0.1+ 121020 246 0.9+ 0.0 121125 C10 (3.4+ 2.2+) 121009 F51 0.1+ 0.1+ 121020 C32 0.1- 0.2- 2013/ 121015 G96 0.5- 0.6- 121020 C32 0.2+ 0.2- 130206 291 0.2- 0.1+ 121015 G96 0.1+ 0.3- 121020 130 0.4- 0.1+ 130206 291 0.2- 0.4+ 121015 G96 0.5- 0.5- 121020 C32 0.5+ 0.3+ 130206 291 0.1+ 0.4+ 121015 G96 0.4- 0.6- 121020 C32 0.4+ 0.1+ 131228 926 0.4+ 0.1+ 121017 568 0.0 0.0 121020 130 0.2- 0.2- 131228 926 0.1- 0.7- 121017 568 0.0 0.0 121021 372 0.1+ 0.1+ 131230 926 0.1- 0.0 121017 568 0.0 0.0 121021 372 0.0 0.1- 131230 926 0.2- 0.2- 121019 H06 0.4+ 0.4- 121021 372 0.4- 0.2- 131230 926 0.1+ 0.6+ 121019 H06 0.2+ 0.0 121022 C10 0.4+ 0.1- 121019 H06 0.2- 0.4+ 121022 C10 0.7- 1.2- ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2014 Jan. 17