Nakano Note (Nakano wa Kangaeru noda) NK 2083 P/2009 SK280 (Spacewatch-Hill)
The following improved orbital elements, by S. Nakano, are from 81 observations 2009 Sept. 17 to 2010 Dec. 8. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.53 arc second. See the previous orbits in NK 1983 and NK 2004 (= HICQ 2010/2011). Epoch = 2009 May 9.0 TT T = 2009 May 24.66360 +/- 0.05814 (m.e.) TT Peri. = 328.31122 +/- 0.00735 Node = 36.41464 +/- 0.00006 (2000.0) Inc. = 16.80367 +/- 0.00006 q = 4.1992123 +/- 0.0000512 AU e = 0.1209638 +/- 0.0000146 a = 4.7770640 +/- 0.0000206 AU n' = 0.09439793 +/- 0.00000061 P = 10.441 +/- 0.0000675 years The predicted orbit for the 2019 return is as follows: T = 2019 Oct. 23.96476 TT Epoch = 2019 Oct. 4.0 TT Peri. = 327.95938 e = 0.1198119 Node = 36.41853 (2000.0) a = 4.7816241 AU Inc. = 16.79875 n'= 0.09426293 q = 4.2087288 AU P = 10.456 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2009/ 091016 H01 0.4+ 0.5+ 091116 G96 0.3- 0.5- 090917 691 0.8+ 0.2+ 091016 H01 0.4+ 0.5+ 091116 G96 0.4- 0.1- 090917 691 0.5+ 0.4+ 091016 926 0.4+ 0.6+ 091118 215 1.4+ 1.2+ 090917 691 0.7+ 0.0 091016 926 0.1+ 0.5- 091121 349 0.4+ 0.1- 090925 691 1.1- 0.6- 091016 H10 0.2- 0.1+ 091121 349 1.2+ 0.5+ 090925 691 0.2+ 0.3+ 091016 H10 0.3+ 0.2+ 091126 G96 0.1- 0.3- 090925 691 0.2+ 0.4+ 091017 204 0.3+ 0.4- 091126 G96 1.0- 0.4- 090929 691 0.0 0.0 091018 204 0.2- 0.2+ 091126 G96 0.6- 0.4- 090929 691 1.2- 0.6- 091019 B01 0.4- 0.1- 091126 G96 0.0 0.0 090929 691 0.1+ 0.2+ 091019 B01 1.1+ 0.6- 091126 G96 0.2- 0.2+ 091015 G96 0.0 0.0 091019 B01 0.2+ 0.7+ 091210 A77 1.1- 0.2- 091015 G96 0.2- 0.7- 091019 H06 0.6- 0.0 091210 A77 0.1+ 0.5- 091015 G96 0.1- 0.5- 091019 H06 0.0 0.7- 091211 A77 (0.4+ 2.6-) 091015 G96 0.2- 0.1- 091019 215 0.2+ 0.6- 091214 A77 0.7+ 0.1+ 091015 G96 0.1- 0.3+ 091024 G96 0.6- 0.3- 091214 A77 0.1+ 0.1+ 091015 G96 0.0 0.0 091024 G96 0.4- 0.0 091214 A77 0.4+ 0.2- 091015 G96 0.1+ 0.2+ 091024 G96 0.7- 0.8- 2010/ 091015 G96 0.2- 0.3+ 091024 G96 0.0 0.5- 101018 H36 1.6- 0.8+ 091015 B86 0.1- 0.1- 091025 130 0.0 0.6- 101018 H36 0.7- 0.8+ 091015 B86 0.5- 0.3+ 091025 130 0.7+ 0.2- 101018 H36 1.2+ 0.2- 091016 291 0.2- 0.2+ 091109 204 0.4- 0.1+ 101020 H36 0.0 0.0 091016 291 0.6- 0.2+ 091109 204 0.4- 0.3- 101020 H36 0.5+ 0.4- 091016 G96 0.6+ 0.3+ 091111 H06 0.6+ 1.9+ 101020 H36 (1.3+ 2.2-) 091016 291 0.3- 0.6+ 091111 H06 0.5+ 1.0+ 101208 G96 0.1+ 0.3- 091016 G96 0.7- 0.3- 091111 H06 0.5+ 0.5- 101208 G96 0.1- 0.0 091016 G96 0.1- 0.1+ 091111 A77 1.2- 1.7- 101208 G96 0.7+ 0.4- 091016 G96 0.6+ 0.4+ 091111 A77 0.1+ 0.3+ 101208 G96 0.1+ 0.0 091016 H01 0.2+ 0.5+ 091116 G96 0.1- 0.3- 091016 H01 0.3+ 0.5+ 091116 G96 0.4+ 0.1- ( ) -------- Rejected Obs.
Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2011 May 12