Nakano Note (Nakano wa Kangaeru noda) NK 3420 312P/NEAT
The following improved orbital elements, by T. Kobayashi, are from 37 observations 2001 to 2015. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.49 arc second. The comet has passed 0.75 AU from Jupiter on 2003 Dec. 24 UT. See the previous orbits in NK 1895 and NK 2771. Epoch = 2014 Apr. 13.0 TT T = 2014 Apr. 22.46132 +/- 0.00043 (m.e.) TT Peri. = 207.39732 +/- 0.00034 Node = 144.91835 +/- 0.00016 (2000.0) Inc. = 19.84655 +/- 0.00003 q = 1.9541917 +/- 0.0000078 AU e = 0.4334011 +/- 0.0000021 a = 3.4489859 +/- 0.0000191 AU n' = 0.15387461 +/- 0.00000135 P = 6.405 +/- 0.0000525 years T = 2001 June 22.35199 TT Epoch = 2001 June 20.0 TT Peri. = 202.27437 e = 0.4502181 Node = 147.01172 (2000.0) a = 3.3679430 AU Inc. = 20.85235 n'= 0.15946192 q = 1.8516341 AU P = 6.181 years [ T = 2007 Nov. 23.92919 TT Epoch = 2007 Dec. 6.0 TT Peri. = 207.16999 e = 0.4342532 Node = 144.99966 (2000.0) a = 3.4454256 AU Inc. = 19.86473 n'= 0.15411317 q = 1.9492384 AU P = 6.395 years ] The predicted orbit for the 2020 return is as follows: T = 2020 Sept.24.98907 TT Epoch = 2020 Sept.28.0 TT Peri. = 207.52945 e = 0.4278747 Node = 144.66943 (2000.0) a = 3.4664817 AU Inc. = 19.76823 n'= 0.15271114 q = 1.9832618 AU P = 6.454 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2001/ 011026 608 0.5- 0.3- 140906 G96 0.5+ 0.1+ 010818 644 0.1+ 0.1+ 011115 608 1.0+ 0.1+ 140906 G96 0.2+ 0.3+ 010818 644 0.1- 0.0 011115 608 0.4- 0.5+ 140907 H21 0.6+ 0.2- 010818 644 0.2+ 0.0 011122 644 0.6+ 0.6- 140907 H21 0.6+ 0.5- 010822 608 0.2+ 0.0 011130 608 0.0 1.2+ 140907 H21 0.6+ 0.5+ 010822 608 0.4- 0.5+ 011213 644 0.9+ 0.1+ 141018 215 0.2+ 1.2+ 010825 608 0.4- 0.5- 011213 644 0.3- 0.4- 141018 215 0.4- 0.6+ 010825 608 0.3+ 0.6- 011213 644 0.1+ 0.1- 141018 215 0.0 0.4- 011024 699 0.7+ 0.1- 2014/ 2015/ 011024 699 0.3- 0.4- 140728 Q62 0.1+ 0.6+ 150115 F51 0.2- 0.4- 011024 699 0.1- 0.1+ 140728 Q62 0.8- 0.4- 150115 F51 0.2- 0.2- 011024 699 0.5- 0.6+ 140825 461 0.7- 0.8- 150115 F51 0.2- 0.5- 011026 608 1.1- 0.6+ 140825 461 0.4- 0.1- 011026 608 0.1+ 0.9- 140906 G96 0.2+ 0.2- ( ) -------- Rejected Obs.
Associate of the CBAT Late edition Syuichi Nakano 2017 July 9