Nakano Note (Nakano wa Kangaeru noda) NK 2407 P/2012 X2 (PANSTARRS)
The following improved orbital elements, by S. Nakano, are from 97 observations 2012 Jan. 11 to 2013 Jan. 13. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.39 arc second. Epoch = 2013 Apr. 18.0 TT T = 2013 Mar. 31.23112 +/- 0.01130 (m.e.) TT Peri. = 215.62024 +/- 0.00156 Node = 271.02316 +/- 0.00007 (2000.0) Inc. = 34.12391 +/- 0.00009 q = 4.7483367 +/- 0.0000398 AU e = 0.7705621 +/- 0.0000241 a = 20.6955197 +/- 0.0001055 AU n' = 0.01046862 +/- 0.00000008 P = 94.149 +/- 0.0007199 years (+/- 0.26 day) The predicted orbit for the 2104 return is as follows: T = 2104 Oct. 22.88708 TT Epoch = 2104 Nov. 7.0 TT Peri. = 215.58617 e = 0.7664793 Node = 270.93970 (2000.0) a = 20.2659038 AU Inc. = 34.18161 n'= 0.01080327 q = 4.7325078 AU P = 91.232 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2012/ 121214 W85 0.0 0.0 2013/ 120111 G96 0.3+ 0.2+ 121214 H21 0.2+ 0.2+ 130101 D95 0.4- 0.4+ 120111 G96 0.4- 0.3+ 121214 H21 0.2+ 0.1+ 130101 D95 0.2+ 0.1+ 120111 G96 0.1- 0.2- 121214 H21 0.0 0.4+ 130101 D95 0.0 1.0- 120111 G96 0.1+ 0.3- 121214 J04 0.4+ 0.1+ 130101 349 0.6+ 0.2+ 121212 F51 0.2- 0.1+ 121214 J04 0.0 0.0 130101 349 0.7+ 0.3+ 121212 F51 0.1- 0.0 121214 J04 0.0 0.0 130102 D90 0.1- 0.3+ 121212 F51 0.0 0.0 121215 807 0.1+ 0.1+ 130102 D90 0.1+ 0.3+ 121212 F51 0.1- 0.1- 121215 807 0.3- 0.0 130102 D90 0.3+ 0.2- 121213 807 0.1- 0.5- 121215 807 0.0 0.0 130102 215 0.1+ 0.6- 121213 807 0.1- 0.1+ 121215 807 0.3- 0.0 130102 215 1.9- 0.6- 121213 807 0.1+ 0.1+ 121215 807 0.0 0.1+ 130102 215 (4.1- 0.5-) 121213 807 0.2- 0.2+ 121215 704 0.6+ 0.5- 130105 157 0.3- 0.3- 121213 H06 0.2+ 0.7+ 121215 704 0.1- 0.3- 130105 157 0.1- 0.2- 121213 H06 0.5+ 0.5+ 121215 704 1.0+ 1.6+ 130105 157 0.3- 0.1- 121213 H06 0.7+ 0.4+ 121215 F65 0.3+ 0.2+ 130108 926 0.3+ 0.3+ 121213 H01 0.2- 0.1+ 121215 F65 0.0 0.1- 130108 926 0.1+ 0.4+ 121213 H01 0.2- 0.1+ 121215 F65 0.4+ 0.3- 130108 926 0.0 0.0 121213 H01 0.2- 0.1+ 121215 F65 0.2+ 0.2- 130109 E07 0.2- 0.2- 121213 H01 0.1- 0.0 121215 J04 0.1+ 0.5+ 130109 E07 0.1+ 0.3- 121213 568 0.2- 0.0 121215 J04 0.1+ 0.2+ 130110 C32 0.8- 0.3- 121213 568 0.1- 0.1- 121215 J04 0.0 0.0 130110 C32 1.4- 0.1- 121213 568 0.1- 0.0 121215 204 0.5- 0.0 130110 C32 0.1- 0.2+ 121213 568 0.1- 0.0 121215 204 0.6+ 0.6+ 130110 C32 0.3- 0.4+ 121213 568 0.1- 0.0 121215 204 0.2+ 0.7+ 130110 C32 0.1+ 0.1+ 121214 807 0.4- 0.1+ 121216 204 0.1+ 0.3+ 130110 C32 0.0 0.1+ 121214 807 0.2- 0.0 121216 204 0.3+ 0.3+ 130112 C23 1.4+ 1.0+ 121214 807 0.1- 0.1- 121216 204 0.5+ 0.2+ 130112 C23 1.2+ 0.8+ 121214 807 0.0 0.2- 121219 B51 0.4- 0.2- 130112 C23 0.2+ 0.2- 121214 807 0.0 0.1- 121219 B51 0.5- 0.1- 130113 D90 0.0 0.2- 121214 W85 0.1- 0.1- 121220 349 0.1+ 0.5+ 130113 D90 0.3- 0.2- 121214 W85 0.1- 0.0 121220 349 0.0 0.6+ 130113 D90 0.3- 0.4- 121214 W85 0.3- 0.1- 121231 900 0.1- 0.1- 121214 W85 0.0 0.0 121231 900 0.5+ 0.2- ( ) -------- Rejected Obs.
Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2013 Feb. 3