Nakano Note (Nakano wa Kangaeru noda) NK 4369 P/NEOWISE (2015 J3 = 2021 Bx)

The following improved orbital elements, by S. Nakano, are from 116 observations 2015 to 2021. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.41 arc second. Residuals for the recovery observations were +40" for Right Ascension and -15" for Declination from the prediction in NK 3668 (= HICQ 2020) with the delta-T correction = -0.023 day. The comet has passed 0.48 AU from Jupiter on 1952 Aug. 26 and will pass 0.43 AU and 0.84 AU from Jupiter on 2024 Sept. 21 and 2035 Sept. 4 UT, respectively. Epoch = 2021 Apr. 16.0 TT T = 2021 Apr. 22.17320 +/- 0.00025 (m.e.) TT Peri. = 129.45780 +/- 0.00010 Node = 111.35084 +/- 0.00008 (2000.0) Inc. = 8.13094 +/- 0.00002 q = 1.4920110 +/- 0.0000022 AU e = 0.5543248 +/- 0.0000006 a = 3.3477538 +/- 0.0000068 AU n' = 0.16090658 +/- 0.00000049 P = 6.125 +/- 0.0000187 years T = 2015 Mar. 3.76417 TT Epoch = 2015 Feb. 27.0 TT Peri. = 129.29179 e = 0.5539690 Node = 111.42135 (2000.0) a = 3.3497194 AU Inc. = 8.12543 n'= 0.16076497 q = 1.4940786 AU P = 6.131 years The predicted orbit for the 2027 return is as follows: T = 2027 May 21.51164 TT Epoch = 2027 June 4.0 TT Peri. = 142.17840 e = 0.5347475 Node = 95.21870 (2000.0) a = 3.3799601 AU Inc. = 11.32117 n'= 0.15861224 q = 1.5725348 AU P = 6.214 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2015/ 150612 703 (2.1- 0.7+) 150809 F51 0.0 0.2- 150515 C51 (0.6- 2.1-) 150616 474 0.4- 0.1+ 150809 F51 0.0 0.3- 150515 C51 0.5+ 0.3+ 150616 474 0.3- 0.1- 150809 F51 0.2+ 0.1- 150515 C51 0.5+ 0.7- 150624 474 0.1+ 0.0 150809 F51 0.1- 0.1- 150515 C51 0.6- 0.2+ 150624 474 0.1+ 0.1- 150811 F51 0.0 0.1+ 150515 C51 0.2+ 1.6+ 150624 474 0.2- 0.1+ 150811 F51 0.1- 0.0 150516 C51 0.9- 0.2+ 150624 474 0.0 0.0 150811 F51 0.0 0.1+ 150516 C51 0.3+ 0.3+ 150624 474 0.0 0.1- 150811 F51 0.2+ 0.1+ 150516 C51 0.0 0.1- 150625 F51 0.2+ 0.1+ 150811 F51 0.1+ 0.0 150516 C51 0.2+ 1.0- 150625 F51 0.1+ 0.1+ 150811 F51 0.1+ 0.1+ 150516 C51 1.3+ 0.9- 150710 474 0.3- 0.0 150811 F51 0.1+ 0.1+ 150519 703 0.2+ 1.0- 150710 474 0.0 0.1- 150811 F51 0.2+ 0.1+ 150519 291 0.3+ 0.1- 150710 474 0.2- 0.0 150812 F51 0.0 0.1- 150519 703 0.3+ 0.2+ 150710 474 0.4- 0.1- 150812 F51 0.1+ 0.1+ 150519 291 0.2+ 0.0 150712 F51 0.2+ 0.0 150812 F51 0.1- 0.0 150519 703 (2.1- 0.1+) 150712 F51 0.2+ 0.0 150812 F51 0.0 0.0 150519 703 (2.9- 0.4-) 150712 F51 0.3+ 0.0 150814 G45 (2.2- 0.1-) 150519 291 0.3+ 0.0 150712 F51 0.3+ 0.1+ 150814 G45 0.9- 0.2- 150520 W96 0.2+ 0.4- 150714 F51 0.1- 0.1+ 150814 G45 0.9- 0.2+ 150520 W96 0.2- 0.6+ 150714 F51 0.0 0.0 150814 G45 0.9- 0.3+ 150520 W96 0.2+ 0.7- 150714 F51 0.0 0.0 150814 G45 0.3- 0.6+ 150520 H06 1.0- 0.5+ 150714 F51 0.0 0.1+ 150822 474 0.6- 0.3+ 150520 H06 0.9- 0.6+ 150715 215 1.2- 0.5- 150822 474 0.4- 0.2+ 150520 291 0.1- 0.3+ 150715 215 1.6- 0.2- 150822 474 0.4- 0.2+ 150520 291 0.1- 0.0 150715 215 1.8- 0.2+ 150825 474 0.7- 0.0 150521 W96 0.7- 0.1+ 150719 474 0.5- 0.0 150825 474 1.1- 0.0 150521 W96 0.2- 0.2- 150719 474 0.4- 0.3+ 150825 474 0.2- 0.0 150522 W96 0.1- 0.4- 150719 474 0.1- 0.2- 150906 F51 0.1+ 0.1+ 150522 W96 0.6- 0.3+ 150719 474 0.4- 0.1+ 150906 F51 0.2+ 0.1+ 150522 W96 1.1+ 0.2+ 150719 F52 0.1+ 0.2- 150906 F51 0.0 0.1+ 150522 926 0.1+ 0.2+ 150719 F52 0.1+ 0.0 150906 F51 0.1- 0.1+ 150522 926 0.3- 0.1- 150719 F52 0.2+ 0.0 150907 474 0.2- 0.5+ 150522 291 0.6- 0.2- 150719 F52 0.1+ 0.0 150907 474 0.2- 0.5+ 150522 291 0.6- 0.2- 150721 G45 1.1- 0.0 150907 474 0.7- 0.5+ 150522 291 1.0- 0.3- 150721 G45 0.3- 0.7+ 2021/ 150522 926 0.2+ 0.2- 150721 G45 1.6- 0.5+ 210117 Z84 0.3+ 0.7+ 150522 474 0.5+ 0.1+ 150721 G45 1.3- 1.3+ 210117 Z84 0.4+ 0.2+ 150522 474 0.9+ 0.1- 150724 F51 0.1- 0.1- 210117 Z84 0.6+ 0.1+ 150522 474 0.1+ 0.0 150724 F51 0.0 0.1- 210118 Z84 0.1+ 0.1+ 150612 703 1.6- 0.7- 150724 F51 0.1- 0.1- 210118 Z84 0.0 0.2- 150612 703 0.7- 0.3+ 150724 F51 0.1- 0.1- 210118 Z84 0.8- 0.9+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2021 Jan. 21

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