Nakano Note (Nakano wa Kangaeru noda) NK 1881 P/La Sagra (2009 WJ50 = 5C8427A = 2005 JR71)
The following improved orbital elements, by S. Nakano, are from 48 observations 2005 to 2010. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.71 arc second. Following additinal identification was included: PK09W50J C2005 02 09.26091 09 58 01.47 +34 08 03.1 5C8427A 20.2 Rr G96 PK09W50J C2005 02 09.26522 09 58 01.26 +34 08 04.8 5C8427A 20.1 Rr G96 PK09W50J C2005 02 09.26952 09 58 01.01 +34 08 06.7 5C8427A 19.7 Rr G96 PK09W50J C2005 02 09.27383 09 58 00.81 +34 08 08.4 5C8427A 19.6 Rr G96 Epoch = 2010 Mar. 25.0 TT T = 2010 Mar. 12.40905 +/- 0.00057 (m.e.) TT Peri. = 27.13441 +/- 0.00028 Node = 74.99703 +/- 0.00012 (2000.0) Inc. = 11.27482 +/- 0.00004 q = 1.7914338 +/- 0.0000035 AU e = 0.4096297 +/- 0.0000010 a = 3.0344241 +/- 0.0000026 AU n' = 0.18646171 +/- 0.00000024 P = 5.286 +/- 0.0000069 years T = 2004 Nov. 15.93727 TT Epoch = 2004 Nov. 11.0 TT Peri. = 26.71161 e = 0.4009247 Node = 75.20992 (2000.0) a = 3.0512345 AU Inc. = 11.25790 n'= 0.18492290 q = 1.8279193 AU P = 5.330 years The predicted orbit for the 2015 return is as follows: T = 2015 June 25.44146 TT Epoch = 2015 June 27.0 TT Peri. = 27.24838 e = 0.4107632 Node = 74.96770 (2000.0) a = 3.0319488 AU Inc. = 11.27860 n'= 0.18669009 q = 1.7865357 AU P = 5.279 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2005/ 091119 704 0.8+ 0.5- 100206 C51 1.5+ 0.0 050209 G96 0.2- 0.1- 091119 704 0.1+ 1.5+ 100206 C51 0.5+ 0.9- 050209 G96 0.0 0.1- 091119 J75 0.6- 0.1+ 100206 C51 0.1- 0.7+ 050209 G96 0.4- 0.1+ 091119 J75 0.7- 0.8- 100206 C51 1.0+ 1.1- 050209 G96 0.1- 0.1+ 091119 J75 0.2+ 0.2- 100206 C51 0.2- 0.6- 050508 704 0.1+ 0.6+ 091121 703 1.0- 0.6+ 100206 C51 0.6+ 0.8- 050508 704 0.4- 1.8+ 091121 703 0.1- 0.5- 100206 C51 0.2+ 0.5- 050508 704 0.3- 0.5+ 091121 703 0.5- 0.3- 100207 C51 0.2+ 0.8+ 050510 704 1.1+ 0.9+ 091121 703 0.4- 0.2+ 100207 C51 1.7+ 0.1- 050510 704 0.6+ 0.7+ 091121 703 0.4- 0.2- 100207 C51 0.2+ 0.8- 050510 704 1.3+ 1.1+ 091121 703 0.8+ 0.2+ 100207 C51 1.2+ 0.2+ 050510 704 1.0+ 0.9+ 091121 703 0.5- 1.1+ 100213 291 0.5- 1.1- 2009/ 091210 703 (2.6+ 0.6+) 100213 291 0.1+ 0.2+ 091114 704 0.2- 0.1+ 091210 703 (2.6+ 0.1+) 100213 291 0.5+ 0.3- 091114 704 0.3- 0.2+ 091210 703 (2.1+ 0.5+) 100215 H01 0.1+ 0.1- 091114 704 1.0+ 1.5+ 091210 703 (2.5+ 1.0+) 100215 H01 0.1+ 0.1- 091114 704 1.1- 1.5+ 2010/ 100215 H01 0.2+ 0.3- 091119 704 1.3- 0.7+ 100206 C51 0.4+ 0.3- 091119 704 0.8- 0.2+ 100206 C51 0.0 1.2- ( ) -------- Rejected Obs.
Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2010 Feb. 17