Nakano Note (Nakano wa Kangaeru noda) NK 2264 261P/Larson (2005 N3 = 2012 K4)

The following improved orbital elements, by S. Nakano, are from 106 observations 2005 to 2012. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.71 arc second. The delta-T correction for the prediction in NK 1777 (= HICQ 2011/ 2012) was -0.41 day with RunOff values +420" (R. A.) and +216" (Decl.) for 2012 May 22 observations. See the previous orbits in NK 1292 and NK 1777. Epoch = 2012 Sept.30.0 TT T = 2012 Sept.29.12125 +/- 0.00421 (m.e.) TT Peri. = 58.81659 +/- 0.00187 Node = 298.48078 +/- 0.00028 (2000.0) Inc. = 6.32553 +/- 0.00007 q = 2.1869274 +/- 0.0000186 AU e = 0.3895837 +/- 0.0000052 a = 3.5826818 +/- 0.0000120 AU n' = 0.14534220 +/- 0.00000073 P = 6.781 +/- 0.0000342 years T = 2005 Dec. 10.57730 TT Epoch = 2005 Dec. 16.0 TT Peri. = 58.50625 e = 0.3880631 Node = 298.60419 (2000.0) a = 3.5903326 AU Inc. = 6.32502 n'= 0.14487787 q = 2.1970570 AU P = 6.803 years The predicted orbit for the 2019 return is as follows: T = 2019 June 18.64395 TT Epoch = 2019 June 6.0 TT Peri. = 67.10717 e = 0.4227288 Node = 291.16401 (2000.0) a = 3.4878282 AU Inc. = 6.07592 n'= 0.15131133 q = 2.0134229 AU P = 6.514 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2005/ 050730 415 1.7- 1.3- 051008 703 1.6- 0.1+ 050703 G96 1.2- 0.3- 050730 415 1.0- 1.1- 051008 703 (3.7- 0.8+) 050703 G96 1.2- 0.2- 050731 E12 1.0- 0.9- 051008 703 1.4+ 0.3- 050703 G96 0.5- 0.1- 050731 E12 0.5+ 1.1- 051008 703 0.3+ 0.3- 050703 G96 0.4- 0.5- 050731 E12 1.4- 0.3- 051022 703 1.2+ 1.5- 050705 G96 0.4- 0.1- 050731 E12 0.7- 0.0 051022 703 1.5+ 0.4- 050705 G96 0.4- 0.5- 050803 D74 0.4+ 1.4+ 051022 703 1.4+ 0.6+ 050705 G96 0.4- 0.4+ 050803 D74 1.2+ 1.3+ 051105 J76 0.3- 0.5+ 050705 G96 0.6- 0.2+ 050804 D74 0.1+ 0.8+ 051105 J76 0.2- 0.3+ 050705 G96 0.6- 0.2+ 050804 D74 0.0 1.4+ 051105 J76 1.3- 1.4+ 050705 G96 0.2+ 0.4+ 050804 D74 0.2+ 0.7+ 051112 703 0.1+ 0.5+ 050705 G96 0.5- 0.3+ 050806 644 0.0 0.0 051112 703 1.1+ 0.3+ 050705 G96 0.8- 0.1- 050806 644 0.3+ 0.0 051112 703 1.0+ 0.4- 050705 413 0.3+ 0.1- 050806 644 0.4+ 0.1+ 051112 703 (2.2- 0.5-) 050705 413 0.4+ 0.1+ 050811 673 0.4+ 0.4+ 051112 568 0.9- 0.0 050706 204 1.3- 0.5+ 050811 673 0.5+ 0.5+ 051112 568 0.9- 0.0 050709 673 1.0- 1.0- 050811 673 0.6+ 0.5+ 051119 699 (0.2+ 3.2+) 050709 673 0.2+ 1.1- 050811 673 0.3+ 0.3+ 051119 699 1.7+ 0.8+ 050709 673 1.1+ 1.0- 050829 461 0.2+ 0.2- 051119 699 (8.3+ 0.1-) 050710 673 0.7- 0.6+ 050829 461 0.6+ 0.2- 051125 703 1.5+ 0.2+ 050710 673 0.4- 0.3+ 050829 170 1.1+ 0.6- 051125 703 1.7+ 0.6+ 050710 673 0.1- 0.1- 050829 170 1.1+ 0.6- 051125 703 1.2+ 0.1+ 050711 691 0.6+ 0.2+ 050829 170 1.2+ 0.6- 051125 703 0.8+ 0.7- 050711 691 0.1+ 0.1+ 050829 170 0.5+ 0.3+ 051201 703 0.4+ 0.4+ 050711 691 0.1+ 0.0 050901 691 0.4+ 0.0 051201 703 1.8+ 1.7+ 050713 213 0.8+ 0.8+ 050901 691 1.0+ 0.0 051201 703 0.6+ 1.2+ 050714 213 0.1+ 1.2+ 050901 691 0.6+ 0.1- 051201 703 0.1- 0.4- 050718 644 0.2- 0.3- 050908 673 0.7+ 0.2+ 051202 704 0.8+ 0.1+ 050718 644 0.2+ 0.3- 050908 673 0.3+ 0.1+ 051202 704 0.8- 0.6- 050718 644 0.8+ 0.6+ 050908 673 0.7- 0.1+ 051202 704 (2.1- 1.6+) 050719 147 (2.9+ 2.8+) 050908 673 0.1- 0.1- 051202 704 0.3- 0.1+ 050719 147 0.1- 1.0+ 050925 215 0.7+ 1.1- 2012/ 050719 147 0.4+ 0.8+ 051001 G96 0.6- 0.4- 120522 F65 0.1+ 0.8- 050727 608 0.0 0.4- 051001 G96 0.5- 0.4- 120522 F65 0.2+ 0.0 050727 608 0.0 0.3- 051001 G96 0.7- 0.3- 120522 F65 0.8+ 0.2- 050727 608 0.7- 0.0 051001 G96 0.6- 0.2- 120525 F65 0.3- 0.3+ 050728 415 0.6+ 0.8- 051001 118 1.3+ 0.7- 120525 F65 0.2+ 0.0 050728 415 0.1- 0.5- 051001 118 1.5+ 0.6- 120525 F65 0.5- 0.0 ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 May 27

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