Nakano Note (Nakano wa Kangaeru noda) NK 2131 P/2010 T1 (McNaught)

The following improved orbital elements, by S. Nakano, are from 53 observations 2010 Sept. 11 to 2011 Sept. 30. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.42 arc second. RunOff values on 2011 Sept. observations from an orbit in NK 2038 (= HICQ 2011/2012) were +104" for R. A. and +53" for Decl.. Epoch = 2010 Oct. 11.0 TT T = 2010 Oct. 26.66302 +/- 0.01981 (m.e.) TT Peri. = 220.77971 +/- 0.00396 Node = 130.08012 +/- 0.00026 (2000.0) Inc. = 32.52991 +/- 0.00007 q = 3.2151633 +/- 0.0000360 AU e = 0.3137022 +/- 0.0000229 a = 4.6847934 +/- 0.0000352 AU n' = 0.09720048 +/- 0.00000110 P = 10.140 +/- 0.0001142 years (+/- 0.04 day) The predicted orbit for the 2020 return is as follows: T = 2020 Sept.30.10342 TT Epoch = 2020 Sept.28.0 TT Peri. = 219.48550 e = 0.3201246 Node = 129.17388 (2000.0) a = 4.6141762 AU Inc. = 32.57253 n'= 0.09944039 q = 3.1370647 AU P = 9.912 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2010/ 101005 D96 0.1+ 0.3- 101019 E10 0.0 0.3+ 100911 E12 0.1+ 0.2- 101005 D96 0.2+ 0.4- 101019 E10 0.0 0.6+ 100911 E12 0.1+ 0.3- 101005 D96 0.2+ 0.3- 101020 E10 0.5+ 0.6+ 100911 E12 0.1- 0.5- 101005 D96 0.7- 0.0 101020 E10 0.2- 0.7+ 100911 E12 0.5- 0.6- 101005 D96 0.0 0.3- 101118 E10 0.4+ 0.7+ 101004 E12 0.0 0.2- 101005 E12 0.1+ 0.3- 101118 E10 0.0 0.6+ 101004 E12 0.3- 0.3- 101005 D90 0.4- 0.2+ 101120 D90 0.1+ 0.2- 101004 E12 0.3- 0.5- 101005 E12 0.3- 0.2- 101120 D90 0.5+ 0.2+ 101004 E12 0.5+ 0.4- 101005 D90 0.1- 0.7- 2011/ 101004 E12 0.1- 0.3- 101005 D90 0.2+ 0.7+ 110927 215 0.2- 0.5+ 101004 E12 0.3+ 0.4- 101005 D90 0.1- 0.3+ 110927 215 0.4- 0.0 101005 E12 0.4+ 0.4- 101006 E10 0.7+ 0.5+ 110927 215 0.8- 0.5- 101005 E12 0.2+ 0.3- 101009 D96 0.3- 0.7+ 110928 H06 0.2+ 0.1- 101005 E12 0.0 0.4- 101009 D96 0.4+ 0.8- 110928 H06 0.4+ 0.1- 101005 E12 0.1+ 0.5- 101010 372 0.0 0.4- 110930 H06 0.4+ 0.1- 101005 D96 0.8+ 0.8+ 101010 372 0.4- 0.7+ 110930 H06 0.3+ 0.2- 101005 D96 0.1- 0.3- 101010 372 0.7- 1.2+ 110930 H06 0.3+ 0.1- 101005 D96 0.0 0.1- 101011 D96 0.3- 0.1+ 101005 D96 0.3- 0.7+ 101011 D96 0.4- 0.5+ ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2011 Oct. 12

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