Nakano Note (Nakano wa Kangaeru noda) NK 4849 P/PANSTARRS (2020 MK4)
The following improved orbital elements, by S. Nakano, are from 149 observations 2020 June 15 to 2022 Oct. 29. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.47 arc second. Residuals for the 2022 observations were +41" for Right Ascension and +13" for Declination from an orbit in HICQ 2021, with delta-T correction = -0.19 day. The comet passed 3.85 AU from Saturn on 2020 Nov. 13 and 1.24 AU from Jupiter on 2020 Dec. 24 UT; due to the latter approach, the value of the argument of perihelion changed noticeably due to the small orbital eccentricity. Epoch = 2027 June 4.0 TT T = 2027 June 17.42375 +/- 0.47928 (m.e.) TT Peri. = 97.52478 +/- 0.03284 Node = 0.64841 +/- 0.00053 (2000.0) Inc. = 6.78039 +/- 0.00004 q = 6.1270803 +/- 0.0001609 AU e = 0.0161466 +/- 0.0000108 a = 6.2276355 +/- 0.0001773 AU n' = 0.06341899 +/- 0.00000271 P = 15.541 +/- 0.0006637 years (+/- 0.24 day) T = 2016 Sept.18.30133 TT Epoch = 2016 Sept. 9.0 TT Peri. = 199.54417 e = 0.0433682 Node = 4.96322 (2000.0) a = 6.3127902 AU Inc. = 6.69876 n'= 0.06214011 q = 6.0390160 AU P = 15.861 years The predicted orbit for the 2043 return is as follows: T = 2043 Feb. 24.67729 TT Epoch = 2043 Mar. 12.0 TT Peri. = 103.24221 e = 0.0156714 Node = 0.54051 (2000.0) a = 6.1731678 AU Inc. = 6.79207 n'= 0.06426018 q = 6.0764254 AU P = 15.338 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2020/ 200716 Z84 0.2+ 0.0 200820 954 0.0 0.2+ 200615 F51 0.1+ 0.8- 200716 Z84 0.1+ 0.1- 200820 954 0.0 0.0 200615 F51 0.4+ 0.5- 200718 I41 0.1+ 0.2- 200820 954 0.1- 0.0 200618 I41 0.1+ 0.4- 200719 T05 0.1- 0.4- 200822 T08 0.2+ 0.1+ 200618 I41 0.1- 0.3- 200719 T05 0.4+ 0.6- 200822 T08 0.4+ 0.1- 200620 F51 0.1+ 0.4- 200719 T05 0.7- 0.0 200822 T08 0.1+ 0.7+ 200620 F51 0.2+ 0.4- 200719 T05 0.6- 0.3- 200822 T08 0.1+ 0.6+ 200620 F51 0.2+ 0.6- 200719 Q62 0.2- 0.2- 200822 954 (0.2- 2.5+) 200620 F51 0.1+ 0.4- 200719 Q62 0.5- 0.1- 200822 954 0.0 0.4+ 200624 I41 0.5- 0.4- 200720 204 0.4- 0.5- 200822 954 0.1+ 0.9- 200624 F51 0.0 0.5- 200720 204 0.1- 0.0 200824 Q62 0.3- 0.3+ 200624 F51 0.2+ 0.3- 200721 I41 0.2+ 0.1- 200824 Q62 0.3- 0.5+ 200624 F51 0.1+ 0.4- 200721 I41 0.1- 0.1- 200824 954 0.2- 0.5+ 200709 I41 0.2- 0.6- 200721 T08 0.2+ 0.2- 200824 954 0.4- 0.5+ 200709 I41 0.1+ 0.6- 200721 T08 0.0 0.4- 200824 954 0.2- 0.7+ 200709 T08 0.1- 0.5+ 200721 T08 0.2- 0.0 200908 Q62 0.3- 0.3+ 200709 T08 0.6+ 1.5- 200721 T08 0.1+ 0.2- 200908 Q62 0.0 0.1- 200709 T08 0.5+ 0.9- 200722 F51 0.0 0.1- 200913 568 0.2- 0.6+ 200709 T08 0.2+ 0.8- 200722 E94 0.0 0.1+ 200913 568 0.3- 0.6+ 200710 H21 0.7+ 0.5- 200722 F51 0.1+ 0.1- 200913 568 0.3- 0.6+ 200710 H21 0.3+ 0.4- 200722 F51 0.0 0.1- 200913 568 0.4- 0.6+ 200710 H21 0.2+ 0.3- 200722 E94 0.1+ 0.6+ 200913 568 0.3- 0.6+ 200710 T04 0.4- 0.3- 200722 E94 0.1- 0.1- 200913 568 0.3- 0.6+ 200710 T04 0.7- 0.4- 200722 E94 0.2+ 0.1+ 201009 I41 0.7+ 0.2- 200710 T04 0.7- 0.4- 200725 T08 0.3+ 0.4- 201009 I41 0.2+ 0.2+ 200710 T04 0.5- 0.4- 200725 T08 0.4- 0.7- 201011 X02 0.0 0.2+ 200710 E94 0.6+ 0.1- 200725 T08 0.4- 0.7- 201011 X02 0.1- 0.7+ 200710 E94 0.2+ 0.0 200725 T08 0.3- 0.4+ 201013 I41 1.0+ 0.5+ 200710 E94 0.0 0.0 200729 T08 0.3+ 0.3+ 201013 I41 0.6+ 0.2- 200710 E94 0.0 0.0 200729 T08 0.0 0.1- 201015 I41 0.1- 0.1+ 200710 E94 0.3+ 0.5+ 200729 T08 0.5- 0.1- 201109 568 0.1- 0.4+ 200711 T05 0.5- 0.3- 200729 T08 0.5+ 0.3- 201109 568 0.1- 0.5+ 200711 T05 0.2+ 0.1- 200808 T05 0.5+ 0.4+ 201109 568 0.1- 0.7+ 200711 T05 0.0 0.2- 200808 T05 0.4- 0.6+ 201109 Q62 0.5+ 0.4- 200711 T05 0.5+ 0.3+ 200808 T05 0.1+ 0.2- 201109 Q62 0.3+ 0.0 200711 568 0.0 0.0 200808 T05 0.2- 0.2+ 201111 568 0.3- 0.9+ 200711 568 0.0 0.0 200809 F51 0.0 0.1+ 201111 568 0.3- 0.9+ 200711 568 0.0 0.0 200809 F51 0.0 0.1+ 201111 568 0.3- 0.9+ 200712 I41 0.1- 0.2- 200809 F51 0.0 0.1+ 201113 474 0.2- 0.3- 200712 I41 0.1+ 0.2- 200809 F51 0.0 0.0 201113 474 1.1+ 0.3+ 200712 Q62 0.2+ 0.1- 200810 T08 0.3- 0.4+ 2021/ 200712 Q62 0.2- 0.3- 200810 T08 0.1- 0.3- 210719 807 0.6- 1.7+ 200713 T08 0.0 0.7- 200810 T08 0.5- 0.4+ 210719 807 0.6- 1.8+ 200713 T08 0.1- 0.4- 200810 T08 0.5+ 0.6+ 210902 W84 1.1- 1.3+ 200713 T08 0.6- 0.5- 200812 T05 0.6+ 0.9+ 210902 807 0.6- 1.5+ 200713 T08 0.4- 0.5- 200812 T05 0.2+ 0.6- 210902 807 0.7- 1.9+ 200713 T08 0.4+ 0.4- 200812 T05 0.1+ 0.4+ 210903 W84 0.6- 0.8+ 200716 954 0.1- 0.0 200812 T05 0.1+ 0.8+ 2022/ 200716 954 0.2- 0.1+ 200814 954 0.2+ 0.3+ 220924 G37 1.1+ 1.5- 200716 954 0.2- 0.3+ 200814 954 0.1+ 0.3+ 221029 G37 0.5+ 0.9- 200716 Z84 0.2- 0.0 200814 954 0.1- 0.4+ 221029 G37 0.5+ 1.1- ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2022 Nov. 20