Nakano Note (Nakano wa Kangaeru noda) NK 2456 P/2012 TK8 (TENAGRA)
The following improved orbital elements, by S. Nakano, are from 55 observations 2012 Oct. 6 to 2013 Feb. 6. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.31 arc second. Epoch = 2013 May 28.0 TT T = 2013 May 10.47603 +/- 0.04839 (m.e.) TT Peri. = 128.18210 +/- 0.01185 Node = 289.72652 +/- 0.00133 (2000.0) Inc. = 6.29549 +/- 0.00002 q = 3.0911500 +/- 0.0000832 AU e = 0.2620075 +/- 0.0000491 a = 4.1885928 +/- 0.0000718 AU n' = 0.11497459 +/- 0.00000296 P = 8.572 +/- 0.0002205 years (+/- 0.08 day) The predicted orbit for the 2021 return is as follows: T = 2021 Oct. 25.57687 TT Epoch = 2021 Nov. 2.0 TT Peri. = 128.00724 e = 0.2741756 Node = 288.96730 (2000.0) a = 4.1270943 AU Inc. = 6.34002 n'= 0.11755402 q = 2.9955458 AU P = 8.384 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2012/ 121019 H06 0.2+ 0.1+ 121021 372 0.0 0.0 121006 926 0.2+ 0.1+ 121019 H06 0.2- 0.4+ 121021 372 0.4- 0.2- 121006 926 0.0 0.1- 121020 H06 0.1- 0.0 121022 C10 0.4+ 0.1- 121006 926 0.0 0.3+ 121020 H06 0.0 0.4- 121022 C10 0.7- 1.2- 121008 G96 0.6- 0.3- 121020 H06 0.2+ 0.3- 121104 F51 0.1- 0.0 121008 G96 0.4- 0.1- 121020 A71 0.6- 0.0 121104 F51 0.1- 0.1+ 121008 G96 0.2- 0.2- 121020 A71 0.9- 0.8- 121104 F51 0.1- 0.0 121008 G96 0.5- 0.3- 121020 246 0.5+ 0.7+ 121107 215 0.7+ 0.5- 121009 F51 0.0 0.0 121020 246 0.2+ 1.0+ 121107 215 1.0+ 0.5- 121009 F51 0.0 0.1+ 121020 246 0.2+ 0.8+ 121107 215 1.5+ 0.4- 121009 F51 0.0 0.1+ 121020 246 0.0 1.2- 121117 C32 0.0 0.4+ 121009 F51 0.0 0.1+ 121020 246 0.1+ 0.2- 121117 C32 0.2- 0.5+ 121015 G96 0.5- 0.6- 121020 246 0.9+ 0.0 121117 C32 0.7- 0.2+ 121015 G96 0.1+ 0.3- 121020 C32 0.1- 0.1- 121125 C10 (5.0+ 1.2+) 121015 G96 0.5- 0.5- 121020 C32 0.3+ 0.2- 121125 C10 (3.1+ 2.1+) 121015 G96 0.4- 0.5- 121020 130 0.3- 0.1+ 2013/ 121017 568 0.1+ 0.0 121020 C32 0.5+ 0.3+ 130206 291 0.1- 0.2- 121017 568 0.1+ 0.0 121020 C32 0.5+ 0.1+ 130206 291 0.1- 0.1+ 121017 568 0.0 0.0 121020 130 0.1- 0.1- 130206 291 0.2+ 0.1+ 121019 H06 0.5+ 0.4- 121021 372 0.2+ 0.1+ ( ) -------- Rejected Obs.
Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2013 Apr. 4