Nakano Note (Nakano wa Kangaeru noda) NK 2489 P/SOHO (2003 T12 = 2012 A3)

The following improved orbital elements, by S. Nakano, are from 99 observations 2003 to 2012. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The weighting mean residual is +/- 0.83 arc second. See the previous orbit in NK 2209 (= HICQ 2012). Epoch = 2012 Feb. 3.0 TT T = 2012 Jan. 26.45037 +/- 0.00011 (m.e.) TT Peri. = 217.67007 +/- 0.00076 Node = 176.47168 +/- 0.00060 (2000.0) Inc. = 11.47477 +/- 0.00007 q = 0.5747902 +/- 0.0000017 AU e = 0.7762277 +/- 0.0000007 a = 2.5686389 +/- 0.0000042 AU n' = 0.23941398 +/- 0.00000059 P = 4.117 +/- 0.0000101 years T = 2003 Oct. 16.29224 TT Epoch = 2003 Oct. 8.0 TT Peri. = 214.68009 e = 0.7715533 Node = 179.17546 (2000.0) a = 2.5772701 AU Inc. = 12.07979 n'= 0.23821230 q = 0.5887688 AU P = 4.138 years [ T = 2007 Dec. 13.86158 TT Epoch = 2007 Dec. 6.0 TT Peri. = 217.66668 e = 0.7753188 Node = 176.46451 (2000.0) a = 2.5703385 AU Inc. = 11.46380 n'= 0.23917655 q = 0.5775066 AU P = 4.121 years ] The predicted orbit for the 2016 return is as follows: T = 2016 Mar. 9.49146 TT Epoch = 2016 Feb. 22.0 TT Peri. = 217.74006 e = 0.7754371 Node = 176.40421 (2000.0) a = 2.5700720 AU Inc. = 11.45719 n'= 0.23921375 q = 0.5771427 AU P = 4.120 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2003/ 120114 C50 11.2- 14.0- Y 120118 C50(40.9- 29.9+)Y 031009 249(63.2+ 61.9-)Y 120114 C50 8.3+ 12.8- Y 120118 C50 (5.9- 71.6+)Y 031009 249(19.0+ 24.8-)Y 120114 C50 5.5- 4.4+ Y 120118 C50(41.1- 47.9+)Y 031009 249 (4.7- 26.3-)Y 120114 C50(15.3- 4.4-)Y 120119 C50(0.05- 0.03+)Y 031009 249(39.6+ 5.9-)Y 120114 C50 13.1- 0.3- Y 120119 C50(0.06- 0.03+)Y 031009 249(30.5- 11.2+)Y 120114 C50 3.6+ 4.2- Y 120119 C50(0.05- 0.03+)Y 031009 249 8.4+ 3.4+ Y 120114 C50 12.8- 5.9+ Y 120119 C50(29.8- 67.5+)Y 031009 249(11.2- 41.0-)Y 120114 C50 2.5- 11.9+ Y 120119 C50 (4.7- 42.0+)Y 031009 249(29.1+ 37.1-)Y 120114 C50(10.7- 20.8+)Y 120119 C50(29.2+ 66.6+)Y 031009 249(14.5+ 41.0-)Y 120114 C50 9.9- 3.7+ Y 120119 C50(32.4- 46.4+)Y 031009 249(49.6- 90.0-)Y 120114 C50 5.0- 6.6+ Y 120119 C50(12.6+ 48.8+)Y 031009 249 0.2+ 7.0+ Y 120114 C50(14.0- 20.4+)Y 120119 C50(37.0+ 2.3+)Y 031009 249 (5.2- 34.1-)Y 120114 C50 8.4+ 10.2+ Y 120119 C50(32.9+ 49.6+)Y 031009 249(13.8+ 36.2-)Y 120114 C50 3.4- 10.6+ Y 120119 C50(35.2+ 55.8+)Y 031009 249 (3.6- 23.4-)Y 120114 C50 5.9- 13.3+ Y 120119 C50(38.8+ 67.2+)Y 031009 249 12.7- 0.5+ Y 120114 C50 (4.2- 23.9+)Y 120119 C50(51.7+ 41.3+)Y 031009 249 (8.3- 15.8-)Y 120114 C50 12.0+ 7.5+ Y 120120 C50(57.5+ 71.5+)Y 031009 249 5.4- 0.6+ Y 120114 C50 0.5- 14.0+ Y 120120 C50(13.4+ 45.6+)Y 031009 249 (5.9+ 30.7-)Y 120115 C50 0.3+ 14.5+ Y 120120 C50(13.6+ 62.7+)Y 031009 249(16.7+ 22.1-)Y 120115 C50 (3.9- 16.9+)Y 120120 C50(58.0+ 60.7+)Y 031009 249 (3.8+ 32.6-)Y 120115 C50 0.7+ 13.3+ Y 120120 C50(51.8+ 66.7+)Y 031009 249 (6.7- 49.2-)Y 120115 C50 1.0- 10.7+ Y 120120 C50(98.8+ 75.7+)Y 031009 249(41.4+ 34.3-)Y 120115 C50 0.2- 14.0+ Y 120120 C50(69.7+ 64.7+)Y 031009 249 (7.7+ 25.8-)Y 120115 C50 (8.0+ 15.3+)Y 120120 C50(44.3+ 90.6+)Y 031010 249 13.2+ 9.7- Y 120115 C50 (2.2- 17.5+)Y 120120 C50(14.8+ 53.5+)Y 031010 249 (1.0- 19.2-)Y 120115 C50 (6.7+ 15.8+)Y 120120 C50(16.8- 47.3+)Y 031010 249(11.9+ 29.6-)Y 120115 C50 1.9+ 9.9+ Y 120120 C50(13.7+ 35.2+)Y 031010 249(12.1- 74.8-)Y 120115 C50 0.3- 7.0+ Y 120120 C50(0.05- 0.02+)Y 031010 249 2.9+ 0.5+ Y 120115 C50 (7.4+ 17.2+)Y 120120 C50(43.5- 16.1+)Y 031010 249(24.0+ 18.3+)Y 120115 C50 2.4+ 11.1+ Y 120121 C50(50.9- 16.8+)Y 031010 249(22.7- 20.4-)Y 120115 C50(14.9- 17.0+)Y 120121 C50(68.7- 60.5+)Y 031010 249 (1.2+ 18.7-)Y 120115 C50 (1.7+ 18.9+)Y 120121 C50(29.1+ 34.8+)Y 031010 249 4.4+ 2.5- Y 120115 C50 4.7+ 8.8+ Y 120121 C50(26.0+ 58.5+)Y 031010 249 (9.0+ 54.9-)Y 120115 C50 7.3+ 7.6+ Y 120121 C50(33.8+ 51.2+)Y 031010 249(25.2+ 79.8-)Y 120115 C50 (1.1- 20.4+)Y 120121 C50(31.8+ 21.9+)Y 031010 249(44.3+ 69.2-)Y 120115 C50 0.7- 7.1+ Y 120121 C50(54.1+ 21.6+)Y 031010 249(71.7- 26.2-)Y 120115 C50 (8.3+ 16.8+)Y 120130 H06 1.0- 1.5+ 031010 249 (2.7+ 26.7-)Y 120115 C50 (1.8+ 15.4+)Y 120130 H06 0.8- 1.0+ 031010 249 (7.6- 37.5-)Y 120115 C50(12.1+ 24.6+)Y 120130 H06 0.0 0.3- 031010 249(11.2+ 18.6-)Y 120116 C50 3.0+ 12.2+ Y 120130 H06 0.3+ 1.0- 031010 249(19.2+ 28.6-)Y 120116 C50 (1.8- 29.7+)Y 120131 H06 0.2- 0.6- 031010 249 (7.3- 33.2-)Y 120116 C50 (2.4- 24.1+)Y 120131 H06 0.2- 0.7- 031010 249(47.9- 91.7-)Y 120116 C50 (3.9+ 23.6+)Y 120131 H06 0.1+ 0.4- 031010 249(18.8+ 15.6-)Y 120116 C50 (3.5- 26.0+)Y 120201 H06 0.4+ 0.8- 031010 249(12.6- 89.0-)Y 120116 C50 (0.7+ 26.3+)Y 120201 H06 0.4- 0.7- 031010 249(0.00+ 0.03-)Y 120116 C50 (7.4+ 24.7+)Y 120201 H06 0.6- 0.1- 031010 249 (5.3- 86.7-)Y 120116 C50 (1.2- 30.0+)Y 120202 D95 1.4- 0.1+ 031010 249(0.00- 0.04-)Y 120116 C50 (5.6- 25.2+)Y 120202 D95 (2.6- 3.8-) 031010 249 6.5- 14.8- Y 120116 C50 (4.4+ 26.5+)Y 120203 H06 0.1- 0.6+ 031010 249 (0.8- 52.3-)Y 120116 C50 (8.3- 25.6+)Y 120203 H06 0.4- 1.1+ 031010 249(24.0- 31.0-)Y 120116 C50 7.5- 12.6+ Y 120203 D95 0.3- 0.9+ 031010 249(13.6- 24.5-)Y 120116 C50(16.9+ 22.1-)Y 120203 D95 (2.9- 0.6-) 031010 249 (0.8- 40.3-)Y 120116 C50 12.8- 11.8- Y 120203 215 1.7+ 0.1+ 031010 249 0.0 8.9- Y 120116 C50(47.2- 56.6-)Y 120203 215 (4.2+ 3.4+) 031010 249(19.0- 0.7-)Y 120116 C50 (0.8- 21.4-)Y 120207 H06 0.6- 0.1+ 031010 249(38.8+ 35.3-)Y 120116 C50(56.6- 17.9+)Y 120207 H06 1.1- 0.8- 031010 249 (4.1+ 57.2-)Y 120116 C50(45.1- 7.9-)Y 120207 H06 0.3- 0.8- 031010 249 12.4- 12.2- Y 120116 C50(12.8+ 32.3+)Y 120207 H06 1.6- 1.3- 031010 249(43.1- 27.1-)Y 120116 C50 (7.5- 19.5-)Y 120209 H06 0.0 0.2+ 031010 249(13.9- 47.2-)Y 120117 C50(20.2+ 9.2-)Y 120209 H06 0.1- 0.5- 031010 249 (9.5- 45.2-)Y 120117 C50(65.2- 17.9-)Y 120209 H06 0.3- 0.4- 031010 249(64.0+ 9.4-)Y 120117 C50(39.0- 41.3+)Y 120212 349 0.2- 0.3- 031010 249 (9.9+ 53.6-)Y 120117 C50 (7.4- 21.4+)Y 120212 349 0.8- 0.7- 031011 249 (5.1+ 15.2+)Y 120117 C50 (0.8+ 19.5+)Y 120212 349 0.5+ 0.8+ 031011 249 6.2- 10.6- Y 120117 C50 14.1- 7.6+ Y 120212 349 1.2+ 0.2+ 031011 249 (9.3- 31.5-)Y 120117 C50 (0.2+ 22.6+)Y 120212 367 1.7- 1.4+ 031011 249 (5.5+ 15.9+)Y 120117 C50(41.9- 21.5+)Y 120212 367 0.4+ 0.1+ 031011 249 1.5+ 6.3- Y 120117 C50(35.2+ 8.4+)Y 120212 367 1.8+ 0.8+ 031011 249(18.3- 29.2+)Y 120117 C50(18.9- 16.8-)Y 120212 A71 1.6+ 0.3+ 031011 249(41.9- 44.6-)Y 120117 C50(19.7- 7.0-)Y 120212 A71 1.6+ 1.5- 031011 249 (1.2- 59.6-)Y 120117 C50(21.5- 50.8+)Y 120214 367 (2.8+ 0.2-) 031011 249 (7.0- 55.5-)Y 120117 C50 (7.6+ 47.4+)Y 120214 367 (4.8+ 2.9+) 2012/ 120117 C50(61.2+ 33.1+)Y 120218 J95 0.1+ 0.1+ 120113 C50(0.01+ 0.03-)Y 120117 C50(64.7+ 19.6+)Y 120218 J95 1.3+ 0.0 120113 C50(25.8+ 3.3-)Y 120117 C50(40.2+ 56.2+)Y 120219 H06 0.0 1.1+ 120113 C50 6.6+ 13.1- Y 120117 C50 3.1+ 7.3- Y 120219 H06 0.1- 0.7+ 120113 C50 (8.3- 31.5-)Y 120117 C50 (8.5+ 35.1+)Y 120219 H06 0.0 0.5+ 120113 C50 0.5+ 13.4- Y 120118 C50(25.8- 55.5+)Y 120219 349 0.3- 0.2+ 120113 C50 (1.8+ 26.3-)Y 120118 C50(39.9- 9.8+)Y 120219 349 0.7- 0.2- 120113 C50(10.4+ 20.3-)Y 120118 C50(55.0- 12.1+)Y 120219 349 1.3- 0.8- 120113 C50 (6.9- 18.3-)Y 120118 C50(33.3- 36.4+)Y 120220 C32 1.3- 0.1- 120113 C50 (4.7- 19.4-)Y 120118 C50 (2.5+ 25.6+)Y 120220 C32 (2.6+ 0.7+) 120113 C50 (5.8- 19.5-)Y 120118 C50(25.5- 22.8+)Y 120220 C32 (3.3+ 2.2+) 120113 C50 0.2+ 13.6- Y 120118 C50(22.9- 53.9+)Y 120220 C32 (2.5+ 1.8+) 120113 C50 8.9+ 10.1- Y 120118 C50(43.4+ 78.0+)Y 120220 A71 (2.7+ 0.7+) 120113 C50 11.2+ 14.4- Y 120118 C50(15.7+ 16.0+)Y 120220 A71 1.3+ 1.9+ 120113 C50 (2.9+ 18.7-)Y 120118 C50 (2.4+ 62.0+)Y 120221 204 0.3- 0.7- 120113 C50 10.1- 1.1- Y 120118 C50 (3.0- 57.0+)Y 120221 204 1.8+ 0.9- 120113 C50 2.0+ 11.5- Y 120118 C50(53.9+ 44.9+)Y 120222 A71 0.5- 0.3+ 120114 C50 4.3- 11.5- Y 120118 C50(27.3+ 85.8+)Y 120222 A71 0.6+ 0.1- 120114 C50 9.4- 0.1- Y 120118 C50(22.5+ 69.6+)Y 120304 J95 0.9- 0.7- 120114 C50 7.2- 9.7- Y 120118 C50(37.2- 18.4+)Y 120304 J95 0.2- 0.1- 120114 C50 9.7- 0.4- Y 120118 C50(39.4- 10.2+)Y ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2013 May 17

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