Nakano Note (Nakano wa Kangaeru noda) NK 4111 P/2017 C1 (NEOWISE)

The following improved orbital elements, by S. Nakano, are from 41 observations 2017 Feb. 6 to May 19. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.63 arc second. The comet has passed 3.21 AU from Jupiter on 2017 Aug. 22 UT. Epoch = 2017 Jan. 7.0 TT T = 2017 Jan. 18.94245 +/- 0.00212 (m.e.) TT Peri. = 110.20168 +/- 0.00146 Node = 357.45722 +/- 0.00045 (2000.0) Inc. = 65.75190 +/- 0.00073 q = 1.5017373 +/- 0.0000200 AU e = 0.9277525 +/- 0.0000548 a = 20.7860031 +/- 0.0157809 AU n' = 0.01040034 +/- 0.00001184 P = 94.767 +/- 0.1079220 years (+/-39.4 days) The predicted orbit for the 2110 return is as follows: T = 2110 Feb. 11.96417 TT Epoch = 2110 Feb. 9.0 TT Peri. = 109.97696 e = 0.9278563 Node = 357.35031 (2000.0) a = 20.7336775 AU Inc. = 65.73343 n'= 0.01043974 q = 1.4958044 AU P = 94.409 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2017/ 170210 H01 0.1+ 0.4- 170221 H06 0.6+ 1.0+ 170206 C51 1.7- 0.2- 170210 T04 0.1- 0.3- 170221 H06 0.4+ 1.5+ 170206 C51 0.2- 0.7+ 170210 T04 0.8+ 0.3- 170226 215 0.4- 1.0- 170206 C51 0.2- 0.6+ 170210 T04 0.1- 0.6- 170226 215 0.2- 1.0+ 170206 C51 0.8+ 0.7- 170210 T04 0.1+ 0.2+ 170305 H06 0.1- 0.6+ 170206 C51 0.4- 0.6- 170211 H01 0.1+ 0.3- 170305 H06 0.2- 0.6+ 170206 C51 (0.2+ 2.1-) 170211 695 0.2+ 0.7- 170305 H06 0.4- 0.5+ 170206 C51 (1.7- 2.1+) 170211 H01 0.3+ 0.2- 170325 H06 0.7+ 0.2+ 170206 C51 1.2- 1.7+ 170211 695 0.1+ 0.3- 170325 H06 1.1+ 0.1- 170210 V37 0.1+ 0.5- 170211 H01 0.2+ 0.5- 170325 H06 0.7+ 0.3- 170210 V37 0.5+ 0.5- 170211 695 0.6+ 0.2- 170402 695 0.0 0.9- 170210 V37 0.4+ 0.2- 170211 H01 0.1- 0.3- 170402 695 0.1+ 0.0 170210 H01 0.1+ 0.4- 170215 A71 1.6- 0.7+ 170519 568 0.2- 0.0 170210 H01 0.2+ 0.5- 170215 A71 1.2- 1.0+ 170519 568 0.3- 0.0 170210 H01 0.1+ 0.6- 170221 H06 0.6+ 1.5+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2020 June 1

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