Nakano Note (Nakano wa Kangaeru noda) NK 2088 C/2010 A4 (Siding)

The following improved orbital elements, by S. Nakano, are from 126 observations 2010 Jan. 12 to 2011 Jan. 26. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.64 arc second. The comet has passed 2.73 AU from Saturn on 2008 Sept. 27 and will pass 3.19 AU from Jupiter on 2011 June 19 UT. See the previous orbit in NK 2002 (= HICQ 2010/2011). Epoch = 2010 Oct. 11.0 TT T = 2010 Oct. 8.76263 +/- 0.00055 (m.e.) TT Peri. = 271.69085 +/- 0.00015 Node = 346.68572 +/- 0.00003 (2000.0) Inc. = 96.73024 +/- 0.00004 q = 2.7379655 +/- 0.0000034 AU e = 0.9903908 +/- 0.0000059 1/a = +0.0035096 +/- 0.0000021 1/AU origin = +0.003622 (Q= 7) future = +0.003691 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2010/ 100116 372 0.3+ 0.4+ 100306 423 0.7- 0.5+ 100112 E12 0.0 0.3- 100116 372 0.6+ 0.3+ 100311 415 0.3- 0.1+ 100112 E12 0.5- 0.2+ 100116 372 0.2+ 0.4- 100311 415 0.6- 0.4+ 100112 E12 0.4- 0.6+ 100117 372 0.9+ 0.3+ 100317 415 0.2- 0.5- 100113 I20 0.7- 0.1+ 100117 372 0.4+ 0.0 100317 415 0.9- 0.2- 100113 I20 0.1- 0.5+ 100117 372 0.4+ 0.2- 100317 372 0.8- 0.1+ 100113 I20 0.4+ 0.6+ 100117 372 0.8- 1.2- 100317 372 0.7- 0.1- 100113 H01 0.7+ 0.0 100120 415 0.3+ 0.0 100408 E85 (1.1+ 2.7+) 100113 H01 0.6+ 0.0 100120 415 0.0 0.0 100408 E85 0.1+ 0.2+ 100113 H01 0.6+ 0.1- 100122 349 1.3- 1.1+ 100408 E85 0.5- 0.1- 100113 H01 0.6+ 0.1- 100122 349 (2.4- 2.1+) 100408 467 0.3- 0.1- 100113 H01 0.7+ 0.2- 100122 349 (2.3- 1.0+) 100408 467 0.1- 0.0 100113 H06 0.4- 1.5+ 100122 349 (2.5- 0.8+) 100408 467 0.3- 0.2- 100113 H06 0.6+ 0.0 100122 900 1.1- 0.9- 100428 C51 1.8+ 0.4+ 100113 682 0.1+ 0.1+ 100122 900 0.7+ 1.0- 100428 C51 1.2+ 0.1+ 100113 H06 0.4+ 0.2- 100123 D90 1.4+ 0.0 100428 C51 1.3+ 0.5+ 100113 682 0.8- 1.0+ 100123 D90 1.1- 0.3+ 100428 C51 1.1+ 0.3+ 100113 H06 0.2+ 0.0 100123 D90 (2.0+ 1.1-) 100428 C51 1.0+ 0.1+ 100113 H21 0.8- 0.1+ 100123 D90 0.1- 0.2- 100430 E10 (2.3+ 1.7-) 100113 H21 0.3- 0.1- 100123 D90 0.3+ 0.2+ 101005 D90 1.0- 0.0 100113 H21 1.0- 0.8+ 100123 D90 0.8+ 0.6- 101005 D90 1.0- 0.2+ 100113 H21 1.2- 0.7- 100123 D90 0.8- 1.0- 101005 D90 0.7- 0.6+ 100113 H06 0.0 0.7+ 100124 349 0.2+ 1.3- 101008 D90 0.5- 0.1+ 100113 H21 0.5- 1.2+ 100124 349 0.4- 1.0- 101008 D90 0.0 0.3+ 100113 H21 1.0- 0.3- 100124 372 1.5+ 0.9- 101010 D96 1.1- 0.2- 100113 H06 0.2- 1.5+ 100124 372 0.9+ 0.8- 101010 D96 0.5- 0.4- 100113 H10 0.1+ 0.7+ 100125 372 1.7+ 1.1+ 101010 D96 0.9- 0.7- 100113 H10 0.8- 0.5+ 100126 D96 1.0+ 0.1- 101105 D90 0.9+ 0.1+ 100113 H10 1.5- 0.3- 100126 D96 1.0+ 0.4- 101105 D90 0.7+ 0.2- 100113 D90 0.6+ 0.7- 100204 E85 0.0 0.3+ 101105 D90 0.5+ 0.5- 100113 D90 0.3- 0.4- 100204 E85 0.4- 0.1- 101114 D96 0.4+ 0.4+ 100113 D90 0.1+ 0.7- 100204 E85 0.4+ 0.1- 101116 D90 0.0 0.6- 100114 I19 0.4- 0.2+ 100206 D96 0.6- 1.2- 101116 D90 0.1- 0.2- 100114 I19 0.2- 0.5+ 100206 D96 0.1+ 0.7- 101116 D90 0.1- 0.3+ 100114 I19 0.3- 0.5+ 100206 D96 0.3- 1.4- 101204 D96 0.2- 0.3- 100114 926 0.3+ 0.0 100212 D96 0.8+ 1.6+ 101228 D96 0.2+ 0.5- 100114 926 0.2+ 0.5- 100212 D96 (1.2+ 2.0+) 101228 D96 0.5+ 0.9- 100114 926 0.2+ 0.0 100217 D96 0.7+ 0.5+ 101228 D96 0.5+ 0.3- 100114 D90 0.3+ 0.4- 100217 D96 0.5+ 0.3+ 2011/ 100114 D90 0.2+ 0.5- 100218 E16 0.3- 0.2- 110109 474 0.5- 0.0 100114 D90 0.9+ 1.4- 100218 E16 0.3- 0.1- 110109 474 0.6- 0.1- 100116 204 0.2- 0.0 100218 E16 0.2- 0.0 110109 474 0.5- 0.1- 100116 204 0.0 0.3+ 100226 213 0.1+ 0.2+ 110109 474 0.5- 0.2- 100116 415 0.7- 0.1- 100226 213 0.3+ 0.6+ 110126 D96 0.1- 1.2+ 100116 415 0.9- 1.5+ 100306 423 1.3- 0.9- 110126 D96 0.2+ 0.0 ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2011 May 12

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