Nakano Note (Nakano wa Kangaeru noda) NK 4645 P/PANSTARRS (2017 R1 = 2022 B2)
The following improved orbital elements, by S. Nakano, are from 79 observations 2017 to 2022. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.36 arc second. Residuals for the recovery observations were +32" for Right Ascension and -12" for Declination from the prediction in NK 4192 with the delta-T correction = -0.10 day. The comet has passed 0.048 AU from Jupiter on 1979 June 23 UT. Before this close approach, comet had an orbit of T= 1978 10 21.3, q= 5.354 AU, e= 0.262, Peri.= 91.6, Node= 22.3, i= 2.1, a= 7.259 AU, P= 19.6 years. Although there is no close approach before 1960, but comet had an orbit of q= 5.74, e= 0.06, Peri.= 316, Node= 63, i= 4. See the previous orbits in NK 3541, NK 4192 and CBET 5100 (same orbit). Epoch = 2025 Sept. 2.0 TT T = 2025 Sept. 9.45705 +/- 0.01866 (m.e.) TT Peri. = 178.86637 +/- 0.00117 Node = 143.59127 +/- 0.00049 (2000.0) Inc. = 2.57486 +/- 0.00005 q = 3.3279217 +/- 0.0000115 AU e = 0.1945599 +/- 0.0000012 a = 4.1318052 +/- 0.0000156 AU n' = 0.11735303 +/- 0.00000067 P = 8.399 +/- 0.0000476 years T = 2017 Apr. 8.22170 TT Epoch = 2017 Mar. 28.0 TT Peri. = 178.38204 e = 0.1945496 Node = 143.65324 (2000.0) a = 4.1310734 AU Inc. = 2.57341 n'= 0.11738422 q = 3.3273749 AU P = 8.396 years The predicted orbit for the 2034 return is as follows: T = 2034 Jan. 17.56355 TT Epoch = 2033 Dec. 29.0 TT Peri. = 178.01980 e = 0.1969807 Node = 143.59035 (2000.0) a = 4.1330173 AU Inc. = 2.57666 n'= 0.11730141 q = 3.3188928 AU P = 8.402 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2017/ 170914 F51 0.1+ 0.0 170919 691 1.7- 0.4- 170718 W84 0.2+ 0.2- 170915 I52 0.4- 0.9+ 170919 691 0.1- 0.4+ 170721 W84 0.3+ 0.0 170915 I52 0.3+ 0.7+ 170919 691 0.3- 0.4- 170724 W84 0.4+ 0.1+ 170915 I52 0.7- 0.1- 170919 I52 0.2+ 0.3- 170730 W84 0.3+ 0.1- 170915 W85 0.1+ 0.3- 170919 I52 0.1+ 0.1- 170730 F51 0.2- 0.0 170915 W85 0.1+ 0.5- 170919 I52 0.3- 0.4- 170730 F51 0.1- 0.1+ 170915 W85 0.2+ 0.4- 170919 I52 0.4- 0.3- 170730 F51 0.3- 0.1+ 170915 W85 0.0 0.4- 170920 W84 0.1+ 0.1- 170730 F51 0.1- 0.1+ 170915 W85 0.4+ 0.3- 170928 F51 0.3+ 0.0 170801 F51 0.4+ 0.2- 170915 568 0.2+ 0.1- 170928 F51 0.1+ 0.2+ 170801 F51 0.3+ 0.1+ 170915 568 0.2+ 0.0 170928 F51 0.0 0.1+ 170801 F51 0.0 0.1+ 170915 568 0.2+ 0.0 171014 215 0.3- 0.7+ 170801 F51 0.3+ 0.1- 170915 Q62 0.6- 0.0 171014 215 0.0 0.0 170803 F51 0.2- 0.0 170915 Q62 0.4- 0.2+ 171014 215 0.1+ 0.5- 170803 F51 0.3- 0.2- 170915 Q62 0.1- 0.3+ 2018/ 170803 F51 0.1- 0.0 170917 W84 0.1+ 0.1- 180106 F51 0.2- 0.1- 170803 F51 0.2- 0.2+ 170917 W84 0.3+ 0.0 180106 F51 0.1+ 0.2+ 170817 F51 0.2+ 0.0 170917 F51 0.0 0.1- 2022/ 170817 F51 0.1+ 0.2+ 170917 F51 0.1+ 0.1- 220125 G96 0.6+ 0.0 170817 F51 0.1+ 0.0 170917 F51 0.0 0.2- 220125 G96 0.1- 0.2+ 170817 F51 0.1+ 0.0 170917 F51 0.1- 0.2- 220125 G96 0.1- 0.1+ 170902 G96 0.3- 0.2+ 170918 691 1.1- 0.4- 220125 G96 0.6- 0.8+ 170902 G96 0.6- 0.1- 170918 691 1.2- 0.0 220210 F52 0.0 0.1- 170902 G96 0.6- 0.6- 170918 691 1.2- 0.2+ 220210 F52 0.1+ 0.0 170902 G96 0.7- 0.2- 170918 I52 0.2+ 0.2+ 220210 F52 0.1- 0.1+ 170914 F51 0.0 0.2+ 170918 I52 0.6- 0.3+ 220210 F52 0.0 0.2- 170914 F51 0.2- 0.0 170918 I52 0.5- 0.4- 170914 F51 0.1+ 0.0 170918 I52 1.2- 0.4+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2022 Feb. 16