Nakano Note (Nakano wa Kangaeru noda) NK 2413 256P/LINEAR

The following improved orbital elements, by S. Nakano, are from 70 observations 2003 to 2013. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.64 arc second. The residuals from an orbit in NK 2210 (= HICQ 2012) were 50" off for 2013 observations with the delta-T correction = +0.05 day. See the previous orbits in NK 1110, NK 1921 and NK 2210. Epoch = 2013 Mar. 9.0 TT T = 2013 Mar. 17.40992 +/- 0.00153 (m.e.) TT Peri. = 124.12103 +/- 0.00043 Node = 81.44591 +/- 0.00008 (2000.0) Inc. = 27.63695 +/- 0.00003 q = 2.6899252 +/- 0.0000061 AU e = 0.4187863 +/- 0.0000013 a = 4.6281178 +/- 0.0000032 AU n' = 0.09899140 +/- 0.00000010 P = 9.956 +/- 0.0000104 years T = 2003 Apr. 17.77310 TT Epoch = 2003 May 1.0 TT Peri. = 124.06479 e = 0.4198840 Node = 81.47150 (2000.0) a = 4.6051419 AU Inc. = 27.67068 n'= 0.09973315 q = 2.6715163 AU P = 9.882 years The predicted orbit for the 2023 return is as follows: T = 2023 Mar. 12.23593 TT Epoch = 2023 Feb. 25.0 TT Peri. = 124.19318 e = 0.4179873 Node = 81.33032 (2000.0) a = 4.6396315 AU Inc. = 27.61933 n'= 0.09862314 q = 2.7003243 AU P = 9.994 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2003/ 030428 704 0.6- 1.2- 120126 372 0.7+ 0.9- 030127 704 (0.8+ 2.7+) 030429 704 0.4+ 0.0 120126 372 0.3- 0.2+ 030127 704 0.2+ 0.5- 030429 704 0.6+ 0.1+ 120126 372 0.9- 0.5- 030127 704 0.0 1.4+ 030429 704 0.1+ 0.4+ 120127 372 0.9- 1.1+ 030127 704 0.9- 0.3- 030429 704 0.4+ 0.2- 120127 372 0.4- 0.1+ 030208 608 0.0 0.1- 030429 704 0.3- 0.3- 120127 372 0.0 0.6- 030208 608 0.1+ 0.4- 030502 608 0.0 0.6- 120129 H06 0.3+ 1.1+ 030208 608 0.3- 1.3- 030502 608 0.4- 0.7- 120129 H06 0.8+ 0.9+ 030424 704 0.5+ 0.1+ 030515 608 0.8+ 0.2- 120129 H06 1.6+ 0.9+ 030424 704 0.0 0.5+ 030515 608 0.6- 0.5+ 120131 H06 0.8- 0.9- 030424 704 0.0 0.6- 030515 608 0.8+ 0.8- 120131 H06 0.4- 0.2- 030424 704 0.4- 1.0+ 030601 A35 0.2+ 0.7- 120219 349 0.5- 0.5- 030424 704 1.1- 0.4+ 030601 A35 0.7+ 0.2+ 120219 349 0.6+ 0.9+ 030426 704 0.5+ 0.5+ 030627 J95 (2.7+ 0.5+) 2013/ 030426 704 0.6- 0.4+ 030627 J95 0.2- 1.0+ 130201 H36 0.9- 0.4+ 030426 704 0.2+ 0.1+ 030702 H41 (2.1+ 0.1-) 130201 H36 0.8- 0.9+ 030426 704 0.9- 0.4- 030702 H41 0.7- 0.8- 130201 H36 1.5- 1.1+ 030426 704 0.7- 0.3- 030704 704 1.0+ 0.5+ 130201 G96 0.1- 0.1- 030427 704 0.6- 0.3+ 030704 704 1.8+ 0.8- 130201 G96 0.7+ 0.4- 030427 704 0.8+ 0.6+ 030704 704 1.6+ 0.1- 130201 G96 0.2+ 0.2- 030427 704 1.0- 0.7+ 030704 704 0.4- 1.2+ 130201 G96 0.2- 0.7- 030427 704 0.1+ 0.3+ 030704 H41 (2.5+ 2.8+) 130211 H06 0.3+ 0.5- 030427 704 0.4+ 0.8+ 030704 H41 (1.0+ 3.6+) 130211 H06 0.1+ 0.3- 030428 704 0.1+ 0.3- 030710 204 (2.3+ 0.2-) 130211 H06 0.3+ 0.6- 030428 704 0.1- 0.5+ 030710 204 0.2- 0.2+ 130218 850 0.1- 0.2- 030428 704 0.1+ 0.1- 030710 204 (0.7- 3.9+) 130218 850 0.7+ 0.5- 030428 704 0.1- 0.2- 2012/ ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2013 Mar. 7

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