Nakano Note (Nakano wa Kangaeru noda) NK 2235 P/2009 SK280 (Spacewatch-Hill)

The following improved orbital elements, by S. Nakano, are from 88 observations 2009 Sept. 17 to 2011 Dec. 23. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.52 arc second. See the previous orbits in NK 1983, NK 2004 and NK 2083 (HICQ 2011/ 2012). Epoch = 2009 May 9.0 TT T = 2009 May 24.68535 +/- 0.02894 (m.e.) TT Peri. = 328.31404 +/- 0.00358 Node = 36.41461 +/- 0.00005 (2000.0) Inc. = 16.80373 +/- 0.00004 q = 4.1992322 +/- 0.0000244 AU e = 0.1209567 +/- 0.0000052 a = 4.7770484 +/- 0.0000083 AU n' = 0.09439840 +/- 0.00000025 P = 10.441 +/- 0.0000272 years The predicted orbit for the 2019 return is as follows: T = 2019 Oct. 23.96838 TT Epoch = 2019 Oct. 4.0 TT Peri. = 327.96216 e = 0.1198047 Node = 36.41850 (2000.0) a = 4.7816102 AU Inc. = 16.79881 n'= 0.09426334 q = 4.2087510 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 926 0.4+ 0.6+ 091121 349 1.2+ 0.5+ 090917 691 0.8+ 0.2+ 091016 926 0.1+ 0.5- 091126 G96 0.1- 0.3- 090917 691 0.5+ 0.3+ 091016 H10 0.3- 0.1+ 091126 G96 1.0- 0.3- 090917 691 0.7+ 0.0 091016 H10 0.3+ 0.2+ 091126 G96 0.6- 0.4- 090925 691 1.1- 0.6- 091017 204 0.2+ 0.4- 091126 G96 0.0 0.1+ 090925 691 0.2+ 0.3+ 091018 204 0.2- 0.3+ 091126 G96 0.2- 0.2+ 090925 691 0.2+ 0.4+ 091019 B01 0.4- 0.1- 091210 A77 1.1- 0.1- 090929 691 0.0 0.0 091019 B01 1.1+ 0.6- 091210 A77 0.1+ 0.5- 090929 691 1.2- 0.6- 091019 B01 0.2+ 0.7+ 091211 A77 (0.4+ 2.5-) 090929 691 0.1+ 0.2+ 091019 H06 0.6- 0.0 091214 A77 0.7+ 0.1+ 091015 G96 0.0 0.0 091019 H06 0.1- 0.7- 091214 A77 0.2+ 0.1+ 091015 G96 0.3- 0.7- 091019 215 0.1+ 0.6- 091214 A77 0.5+ 0.2- 091015 G96 0.1- 0.4- 091024 G96 0.6- 0.3- 2010/ 091015 G96 0.2- 0.1- 091024 G96 0.4- 0.0 101018 H36 1.5- 0.7+ 091015 G96 0.1- 0.3+ 091024 G96 0.7- 0.8- 101018 H36 0.7- 0.6+ 091015 G96 0.0 0.0 091024 G96 0.0 0.5- 101018 H36 1.2+ 0.3- 091015 G96 0.0 0.2+ 091025 130 0.0 0.6- 101020 H36 0.0 0.1- 091015 G96 0.2- 0.3+ 091025 130 0.7+ 0.2- 101020 H36 0.5+ 0.5- 091015 B86 0.1- 0.1- 091109 204 0.4- 0.1+ 101020 H36 (1.3+ 2.3-) 091015 B86 0.5- 0.3+ 091109 204 0.4- 0.2- 101208 G96 0.2+ 0.6- 091016 291 0.2- 0.2+ 091111 H06 0.6+ 1.9+ 101208 G96 0.0 0.2- 091016 291 0.6- 0.3+ 091111 H06 0.5+ 1.0+ 101208 G96 0.8+ 0.6- 091016 G96 0.6+ 0.3+ 091111 H06 0.5+ 0.5- 101208 G96 0.2+ 0.2- 091016 291 0.3- 0.6+ 091111 A77 1.2- 1.6- 2011/ 091016 G96 0.7- 0.3- 091111 A77 0.1+ 0.3+ 111223 950 0.0 0.3+ 091016 G96 0.1- 0.1+ 091116 G96 0.1- 0.3- 111223 950 0.3- 0.1+ 091016 G96 0.6+ 0.4+ 091116 G96 0.4+ 0.1- 111223 950 0.1+ 0.2+ 091016 H01 0.2+ 0.5+ 091116 G96 0.3- 0.5- 111223 950 0.0 0.3+ 091016 H01 0.3+ 0.5+ 091116 G96 0.4- 0.1- 111223 950 0.0 0.2+ 091016 H01 0.4+ 0.5+ 091118 215 1.4+ 1.2+ 111223 950 0.1- 0.1+ 091016 H01 0.3+ 0.5+ 091121 349 0.4+ 0.1- 111223 950 0.4+ 0.1+ ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 Apr. 26

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