Nakano Note (Nakano wa Kangaeru noda) NK 3421 317P/WISE

The following improved orbital elements, by T. Kobayashi, are from 80 observations 2005 to 2016. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.50 arc second. The comet has passed 0.71 AU from Jupiter on 2012 Nov. 29 UT. See the previous orbits in NK 2316 and NK 2835. Epoch = 2015 Aug. 6.0 TT T = 2015 Aug. 16.78946 +/- 0.00010 (m.e.) TT Peri. = 334.78872 +/- 0.00013 Node = 275.56739 +/- 0.00011 (2000.0) Inc. = 11.93943 +/- 0.00002 q = 1.2762115 +/- 0.0000005 AU e = 0.5698468 +/- 0.0000002 a = 2.9668765 +/- 0.0000019 AU n' = 0.19286565 +/- 0.00000019 P = 5.110 +/- 0.0000048 years T = 2005 July 8.02462 TT Epoch = 2005 July 9.0 TT Peri. = 328.43517 e = 0.5905526 Node = 281.17041 (2000.0) a = 2.9211032 AU Inc. = 10.64661 n'= 0.19741663 q = 1.1960382 AU P = 4.993 years T = 2010 July 7.54858 TT Epoch = 2010 July 23.0 TT Peri. = 328.52612 e = 0.5899629 Node = 281.13164 (2000.0) a = 2.9225057 AU Inc. = 10.64522 n'= 0.19727453 q = 1.1983358 AU P = 4.996 years The predicted orbit for the 2020 return is as follows: T = 2020 Sept.26.18639 TT Epoch = 2020 Sept.28.0 TT Peri. = 334.91055 e = 0.5704151 Node = 275.51925 (2000.0) a = 2.9650789 AU Inc. = 11.95095 n'= 0.19304106 q = 1.2737532 AU P = 5.106 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2005/ 100603 291 0.0 0.1- 150126 F51 0.4+ 0.2+ 050728 E12 (2.1+ 0.2+) 100603 291 0.1- 0.1- 150126 F51 0.2+ 0.2+ 050728 E12 1.5+ 1.4+ 100603 291 0.1+ 0.3- 150126 F51 0.1+ 0.5+ 050728 E12 0.9- 0.2+ 100603 H06 1.0+ 1.7- 150318 F51 0.1+ 0.1+ 2010/ 100603 H06 1.8+ 1.2- 150318 F51 0.1+ 0.0 100527 C51 0.1+ 0.3+ 100604 H21 0.9+ 0.1+ 150318 F51 0.1+ 0.1+ 100527 C51 0.0 0.0 100604 H21 1.1+ 0.7+ 150318 F51 0.2+ 0.0 100527 C51 0.0 0.1+ 100604 H21 0.4+ 1.1+ 150319 568 0.2+ 0.1+ 100527 C51 0.0 0.2+ 100604 H36 1.7- 0.7- 150319 568 0.0 0.0 100527 C51 0.1- 0.2+ 100604 H36 0.4+ 0.9- 150319 568 0.0 0.1+ 100527 C51 0.1- 0.2+ 100604 291 0.1- 0.2- 150504 C51 0.2- 0.3- 100527 C51 0.1+ 0.3+ 100604 291 0.2- 0.1- 150504 C51 1.4- 1.4+ 100528 C51 0.3- 0.1- 100604 695 0.2- 0.2- 150504 C51 0.5+ 0.1+ 100528 C51 0.2- 0.4+ 100604 291 0.0 0.1- 150504 C51 0.4+ 1.0- 100528 C51 0.1- 0.0 100604 695 0.2- 0.1- 150504 C51 0.6- 0.9+ 100528 C51 0.2- 0.3+ 100604 695 0.0 0.6+ 150504 C51 0.2+ 1.2- 100528 C51 0.0 0.3- 100604 474 0.1- 0.0 150505 C51 0.8+ 0.6- 100528 C51 0.2- 0.5+ 100604 474 0.2- 0.1+ 150505 C51 0.0 0.3- 100528 C51 0.1- 0.1+ 100604 474 0.3- 0.0 150906 Q62 (8.5+ 0.5-) 100528 C51 0.3- 0.0 100604 474 0.1- 0.1+ 150906 Q62 (8.8+ 0.6-) 100528 C51 0.0 0.1- 100604 474 0.3+ 0.0 150906 Q62 (9.7+ 0.8-) 100528 C51 0.2- 0.3+ 100708 D90 0.3- 0.3+ 150914 Q62 (7.0+ 2.7-) 100528 C51 0.1- 0.2+ 100708 D90 0.1- 0.1+ 150914 Q62 (6.9+ 2.4-) 100528 C51 0.1- 0.1+ 100708 D90 0.9+ 1.0- 150914 Q62 (7.1+ 2.7-) 100528 C51 0.1- 0.0 100714 474 0.7- 0.0 2016/ 100529 C51 0.2- 0.0 100714 474 0.5- 0.0 161002 568 0.0 0.2+ 100529 C51 0.4- 0.1+ 100714 474 0.4- 0.1- 161002 568 0.2- 0.2+ 100529 C51 0.4- 0.3+ 100714 474 0.4- 0.2- 161002 568 0.1- 0.2+ 100529 C51 0.6- 0.3+ 100721 D90 0.1+ 0.5+ 161002 568 0.1- 0.2+ 100603 H36 0.9+ 0.3+ 100721 D90 0.8+ 0.3+ 161002 568 0.1- 0.2+ 100603 H36 (2.3+ 0.8-) 2015/ ( ) -------- Rejected Obs.

Associate of the CBAT Late edition Syuichi Nakano 2017 July 9

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