Nakano Note (Nakano wa Kangaeru noda) NK 2453 P/2012 X2 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 118 observations 2012 Jan. 11 to 2013 Apr. 1. 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 2407. Epoch = 2013 Apr. 18.0 TT T = 2013 Mar. 31.24867 +/- 0.00664 (m.e.) TT Peri. = 215.62262 +/- 0.00093 Node = 271.02315 +/- 0.00007 (2000.0) Inc. = 34.12391 +/- 0.00010 q = 4.7482725 +/- 0.0000227 AU e = 0.7705591 +/- 0.0000114 a = 20.6949719 +/- 0.0000501 AU n' = 0.01046904 +/- 0.00000004 P = 94.145 +/- 0.0003419 years (+/- 0.12 day) The predicted orbit for the 2104 return is as follows: T = 2104 Oct. 21.63726 TT Epoch = 2104 Nov. 7.0 TT Peri. = 215.58876 e = 0.7664732 Node = 270.93973 (2000.0) a = 20.2650440 AU Inc. = 34.18163 n'= 0.01080395 q = 4.7324300 AU P = 91.227 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2012/ 121215 807 0.1+ 0.1+ 130105 157 0.2- 0.0 120111 G96 0.3+ 0.2+ 121215 807 0.3- 0.0 130108 926 0.3+ 0.4+ 120111 G96 0.4- 0.3+ 121215 807 0.0 0.0 130108 926 0.2+ 0.5+ 120111 G96 0.1- 0.2- 121215 807 0.3- 0.0 130108 926 0.1+ 0.1+ 120111 G96 0.1+ 0.3- 121215 807 0.0 0.1+ 130109 E07 0.1- 0.1- 121212 F51 0.2- 0.1+ 121215 704 0.6+ 0.5- 130109 E07 0.2+ 0.2- 121212 F51 0.1- 0.1- 121215 704 0.1- 0.3- 130110 C32 0.7- 0.2- 121212 F51 0.0 0.0 121215 704 1.0+ 1.6+ 130110 C32 1.3- 0.0 121212 F51 0.1- 0.1- 121215 F65 0.3+ 0.2+ 130110 C32 0.0 0.3+ 121213 807 0.1- 0.6- 121215 F65 0.0 0.1- 130110 C32 0.2- 0.6+ 121213 807 0.1- 0.0 121215 F65 0.4+ 0.3- 130110 C32 0.2+ 0.2+ 121213 807 0.1+ 0.0 121215 F65 0.2+ 0.2- 130110 C32 0.1+ 0.2+ 121213 807 0.2- 0.1+ 121215 J04 0.1+ 0.5+ 130112 C23 1.5+ 1.1+ 121213 H06 0.2+ 0.7+ 121215 J04 0.1+ 0.2+ 130112 C23 1.4+ 0.9+ 121213 H06 0.5+ 0.5+ 121215 J04 0.0 0.0 130112 C23 0.3+ 0.1- 121213 H06 0.7+ 0.4+ 121215 204 0.5- 0.0 130113 D90 0.1+ 0.1- 121213 H01 0.2- 0.0 121215 204 0.6+ 0.6+ 130113 D90 0.1- 0.0 121213 H01 0.2- 0.1+ 121215 204 0.2+ 0.7+ 130113 D90 0.2- 0.3- 121213 H01 0.2- 0.0 121216 204 0.1+ 0.3+ 130131 D95 0.5+ 0.3+ 121213 H01 0.1- 0.0 121216 204 0.3+ 0.3+ 130131 D95 0.2+ 0.8- 121213 568 0.2- 0.1- 121216 204 0.5+ 0.2+ 130131 D95 0.6+ 0.2- 121213 568 0.2- 0.1- 121219 B51 0.4- 0.2- 130202 I57 (0.2- 2.2+) 121213 568 0.1- 0.1- 121219 B51 0.5- 0.1- 130202 I57 0.7+ 0.6+ 121213 568 0.1- 0.1- 121220 349 0.1+ 0.5+ 130202 I57 0.6- 1.9- 121213 568 0.1- 0.1- 121220 349 0.0 0.6+ 130210 I57 (0.4+ 4.5+) 121214 807 0.4- 0.1+ 121231 900 0.1- 0.0 130210 I57 1.1+ 0.6+ 121214 807 0.2- 0.0 121231 900 0.5+ 0.2- 130210 I57 1.1+ 0.9- 121214 807 0.1- 0.1- 2013/ 130210 349 0.1+ 1.0+ 121214 807 0.0 0.2- 130101 D95 0.3- 0.5+ 130210 349 0.4- 0.8+ 121214 807 0.0 0.1- 130101 D95 0.3+ 0.2+ 130214 H45 1.8- 0.6+ 121214 W85 0.1- 0.1- 130101 D95 0.0 0.9- 130214 H45 1.3- 0.4+ 121214 W85 0.1- 0.0 130101 349 0.7+ 0.3+ 130214 H45 0.7- 0.6+ 121214 W85 0.3- 0.1- 130101 349 0.7+ 0.4+ 130214 H45 0.8- 0.5+ 121214 W85 0.0 0.0 130102 D90 0.0 0.3+ 130214 H45 0.5- 0.5+ 121214 W85 0.0 0.0 130102 D90 0.1+ 0.3+ 130216 511 0.5- 0.2- 121214 H21 0.2+ 0.2+ 130102 D90 0.3+ 0.1- 130216 511 0.6- 0.4- 121214 H21 0.1+ 0.1+ 130102 215 0.2+ 0.5- 130314 900 0.2+ 0.1+ 121214 H21 0.0 0.4+ 130102 215 1.8- 0.5- 130314 900 0.4+ 0.1+ 121214 J04 0.4+ 0.1+ 130102 215 (4.0- 0.4-) 130401 372 0.1+ 0.7- 121214 J04 0.0 0.0 130105 157 0.2- 0.3- 130401 372 1.0+ 0.0 121214 J04 0.0 0.0 130105 157 0.0 0.1- 130401 372 0.2- 1.3- ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 Apr. 4

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