Nakano Note (Nakano wa Kangaeru noda) NK 2421 P/2012 U2 (PANSTARRS)
The following improved orbital elements, by S. Nakano, are from 36 observations 2012 Oct. 20 to 2013 Feb. 3. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.33 arc second. Epoch = 2012 Dec. 19.0 TT T = 2012 Dec. 4.06150 +/- 0.14045 (m.e.) TT Peri. = 229.52061 +/- 0.02607 Node = 186.84064 +/- 0.00149 (2000.0) Inc. = 10.53091 +/- 0.00029 q = 3.6277904 +/- 0.0000551 AU e = 0.5069937 +/- 0.0000139 a = 7.3585073 +/- 0.0000322 AU n' = 0.04937641 +/- 0.00000032 P = 19.961 +/- 0.0001310 years (+/- 0.05 day) The predicted orbit for the 2031 return is as follows: T = 2031 Dec. 7.49804 TT Epoch = 2031 Nov. 30.0 TT Peri. = 228.24747 e = 0.5000344 Node = 185.15820 (2000.0) a = 7.1558276 AU Inc. = 10.74654 n'= 0.05148898 q = 3.5776676 AU P = 19.142 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2012/ 121022 C32 0.6- 0.4+ 121204 372 0.2- 0.4- 121020 G96 0.0 0.5+ 121023 204 0.1- 0.3+ 121204 372 0.7+ 0.0 121020 G96 0.5- 0.2+ 121023 204 0.2- 0.2- 121208 941 0.0 0.6- 121020 G96 0.5- 0.4+ 121023 H06 0.0 0.0 121208 941 0.0 0.4- 121020 G96 0.5- 0.0 121023 H06 0.3- 0.3+ 121208 941 0.3+ 0.2- 121021 F51 0.0 0.0 121023 H06 0.8- 0.6+ 121212 215 0.3- 0.2- 121021 F51 0.1+ 0.0 121023 H15 0.0 0.3+ 121212 215 0.0 0.4- 121021 F51 0.1+ 0.0 121023 H15 0.6- 0.0 121212 215 0.6+ 0.6- 121021 F51 0.2+ 0.0 121104 C10 1.1- 0.0 2013/ 121022 568 0.0 0.2- 121104 C10 0.3- 0.4+ 130203 H06 0.1+ 0.7+ 121022 568 0.0 0.1- 121113 C10 0.1+ 0.1+ 130203 H06 0.2- 0.5+ 121022 C32 0.0 0.1- 121113 C10 0.3- 0.1+ 130203 H06 0.6- 0.1+ 121022 C32 0.2- 0.4+ 121204 372 0.8+ 0.4+ ( ) -------- Rejected Obs.
Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2013 Mar. 9