Nakano Note (Nakano wa Kangaeru noda) NK 2004 P/2009 SK280 (Spacewatch-Hill)
The following improved orbital elements, by S. Nakano, are from 75 observations 2009 Sept. 17 to 2010 Oct. 20. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.55 arc second. This is the new version orbit of NK 1983 with the corrected Epoch and new additional observations in 2010. Epoch = 2009 May 9.0 TT T = 2009 May 24.66151 +/- 0.06952 (m.e.) TT Peri. = 328.31099 +/- 0.00880 Node = 36.41471 +/- 0.00007 (2000.0) Inc. = 16.80360 +/- 0.00008 q = 4.1992124 +/- 0.0000607 AU e = 0.1209521 +/- 0.0000170 a = 4.7770005 +/- 0.0000241 AU n' = 0.09439981 +/- 0.00000072 P = 10.441 +/- 0.0000791 years The predicted orbit for the 2019 return is as follows: T = 2019 Oct. 23.88675 TT Epoch = 2019 Oct. 4.0 TT Peri. = 327.95899 e = 0.1198000 Node = 36.41860 (2000.0) a = 4.7815639 AU Inc. = 16.79867 n'= 0.09426471 q = 4.2087325 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 G96 0.6+ 0.4+ 091111 A77 0.2+ 0.4+ 090917 691 0.8+ 0.1+ 091016 H01 0.2+ 0.5+ 091116 G96 0.0 0.3- 090917 691 0.5+ 0.3+ 091016 H01 0.3+ 0.5+ 091116 G96 0.4+ 0.0 090917 691 0.6+ 0.0 091016 H01 0.4+ 0.6+ 091116 G96 0.2- 0.4- 090925 691 1.1- 0.7- 091016 H01 0.4+ 0.5+ 091116 G96 0.4- 0.0 090925 691 0.2+ 0.3+ 091016 926 0.4+ 0.6+ 091118 215 1.5+ 1.3+ 090925 691 0.2+ 0.4+ 091016 926 0.1+ 0.4- 091121 349 0.5+ 0.0 090929 691 0.0 0.0 091016 H10 0.2- 0.1+ 091121 349 1.3+ 0.6+ 090929 691 1.2- 0.6- 091016 H10 0.3+ 0.2+ 091126 G96 0.0 0.2- 090929 691 0.0 0.2+ 091017 204 0.3+ 0.4- 091126 G96 0.9- 0.3- 091015 G96 0.0 0.0 091018 204 0.2- 0.3+ 091126 G96 0.5- 0.3- 091015 G96 0.2- 0.7- 091019 B01 0.4- 0.0 091126 G96 0.0 0.1+ 091015 G96 0.1- 0.4- 091019 B01 1.1+ 0.6- 091126 G96 0.1- 0.3+ 091015 G96 0.2- 0.1- 091019 B01 0.2+ 0.7+ 091210 A77 1.0- 0.1- 091015 G96 0.1- 0.3+ 091019 H06 0.5- 0.0 091210 A77 0.2+ 0.4- 091015 G96 0.0 0.0 091019 H06 0.0 0.7- 091211 A77 (0.5+ 2.4-) 091015 G96 0.1+ 0.2+ 091019 215 0.2+ 0.6- 091214 A77 0.8+ 0.2+ 091015 G96 0.2- 0.3+ 091024 G96 0.5- 0.3- 091214 A77 0.2+ 0.2+ 091015 B86 0.1- 0.1- 091024 G96 0.3- 0.0 091214 A77 0.5+ 0.1- 091015 B86 0.5- 0.4+ 091024 G96 0.7- 0.8- 2010/ 091016 291 0.2- 0.2+ 091024 G96 0.0 0.4- 101018 H36 1.7- 1.0+ 091016 291 0.6- 0.3+ 091025 130 0.0 0.5- 101018 H36 0.8- 1.0+ 091016 G96 0.6+ 0.3+ 091025 130 0.8+ 0.2- 101018 H36 1.1+ 0.0 091016 291 0.3- 0.7+ 091109 204 0.3- 0.1+ 101020 H36 0.1- 0.2+ 091016 G96 0.7- 0.2- 091109 204 0.3- 0.2- 101020 H36 0.4+ 0.2- 091016 G96 0.1- 0.1+ 091111 A77 1.2- 1.6- 101020 H36 1.2+ 1.9- ( ) -------- Rejected Obs.
Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2010 Oct. 24