Nakano Note (Nakano wa Kangaeru noda) NK 4353 P/2020 K9 (Lemmon-PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 111 observations 2020 May 22 to Dec. 13. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.49 arc second. The comet has passed 0.056 AU from Jupiter on 2016 Apr. 24 UT. Before this close approach, orbit was T= 2014 Feb. 23.7, q= 4.356 AU, e= 0.289, Peri.= 278.3, Node= 171.1, Inc.= 17.4, a= 6.128 AU, P= 15.2 years. See the previous orbits in CBET 4797, NK 4222 and NK 4300. Epoch = 2021 Jan. 26.0 TT T = 2021 Feb. 11.80348 +/- 0.00466 (m.e.) TT Peri. = 196.87352 +/- 0.00127 Node = 166.23967 +/- 0.00008 (2000.0) Inc. = 23.20885 +/- 0.00009 q = 2.8494255 +/- 0.0000121 AU e = 0.3216024 +/- 0.0000068 a = 4.2002292 +/- 0.0000458 AU n' = 0.11449713 +/- 0.00000187 P = 8.608 +/- 0.0001409 years (+/- 0.05 day) The predicted orbit for the 2029 return is as follows: T = 2029 Sept.28.61320 TT Epoch = 2029 Sept.21.0 TT Peri. = 196.91073 e = 0.3200182 Node = 166.23182 (2000.0) a = 4.2154500 AU Inc. = 23.17779 n'= 0.11387756 q = 2.8664292 AU P = 8.655 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2020/ 200705 118 1.5- 0.5- 200912 F51 0.2+ 0.1+ 200522 G96 0.3+ 0.1- 200705 118 1.0- 0.0 200912 F51 0.1- 0.1+ 200522 G96 0.1+ 0.0 200718 T08 0.4- 0.2- 200912 F51 0.0 0.3+ 200522 G96 0.1+ 0.2+ 200718 T08 0.7- 0.1+ 200912 F51 0.0 0.1+ 200522 G96 0.0 0.1+ 200718 T08 0.2- 0.9- 200913 F52 0.2- 0.2- 200526 F51 0.2+ 0.2+ 200718 T08 (2.3+ 0.3+) 200913 F52 0.2+ 0.2- 200526 F51 0.3+ 0.2+ 200718 T08 0.0 0.9+ 200914 130 0.2- 0.4- 200526 F51 0.2+ 0.1+ 200718 T08 (3.4- 0.7-) 200914 130 0.4+ 0.8+ 200529 T05 0.5- 0.3- 200718 T08 0.5- 0.0 200915 G96 0.6- 0.1+ 200529 T05 0.6+ 0.1+ 200721 F52 0.1+ 0.1- 200915 G96 0.1+ 0.2- 200529 T05 0.5- 0.1- 200721 F52 0.3- 0.1+ 200915 G96 0.1- 0.4- 200529 T05 1.0- 0.5- 200721 F52 0.1+ 0.2+ 200915 G96 0.2- 0.3+ 200614 F51 0.1+ 0.0 200722 T08 0.7- 1.4- 201018 Q11 0.0 0.2- 200614 F51 0.2+ 0.2- 200722 T08 1.1- 0.2+ 201018 Q11 0.0 0.0 200616 Q62 0.6- 0.2+ 200722 T08 0.9- 0.9- 201019 G96 0.3- 0.4+ 200616 Q62 0.5- 0.0 200722 T08 0.3+ 0.3+ 201019 G96 0.2+ 0.3- 200616 Q62 0.3- 0.1- 200729 A71 1.4+ 0.6- 201019 G96 0.2+ 0.7- 200617 568 0.0 0.0 200730 A71 0.0 1.0- 201019 G96 1.0+ 0.1- 200617 568 0.1+ 0.0 200811 T08 0.3+ 0.3+ 201031 A77 1.4+ 0.2+ 200617 568 0.1+ 0.0 200811 T08 0.6+ 0.1- 201031 A77 0.4- 1.2+ 200617 T03 0.1+ 0.2- 200811 T08 0.9+ 0.5- 201031 A77 0.1+ 0.6- 200617 T03 0.6+ 0.3- 200811 T08 0.2- 0.2- 201107 D29 0.9- 0.7- 200617 T03 0.2+ 0.1+ 200818 G96 0.4- 0.1+ 201107 D29 0.5+ 0.2- 200617 T03 0.5+ 0.0 200818 G96 0.6- 0.3- 201107 D29 0.6+ 0.3- 200617 T03 0.1+ 0.1+ 200818 G96 0.2- 0.1- 201110 Q11 0.4+ 0.7+ 200617 T03 0.4+ 0.1- 200818 G96 0.6- 0.3- 201110 Q11 0.9+ 0.9+ 200618 858 0.2+ 0.3- 200819 T08 1.0- 0.0 201114 A77 0.6+ 0.1+ 200618 858 0.1- 0.0 200819 T08 0.5- 0.4+ 201114 A77 1.1+ 0.1+ 200618 858 0.1- 0.1+ 200819 T08 1.1- 0.6- 201114 A77 0.5+ 0.0 200619 Q11 0.8+ 0.2- 200819 T08 0.9- 0.3- 201117 X03 0.1- 1.1- 200619 Q11 0.5+ 0.0 200820 K77 (0.6+ 2.1-) 201117 X03 0.3- 0.3- 200620 204 0.4- 0.2- 200820 K77 1.0- 0.4+ 201117 X03 0.8- 1.2+ 200620 204 0.4- 0.1- 200904 F51 0.1- 0.1+ 201117 X03 0.3- 1.2- 200620 204 0.4- 0.2+ 200904 F51 0.0 0.0 201211 Q11 0.3+ 0.3+ 200620 Q11 0.0 0.5- 200904 F51 0.0 0.1- 201211 Q11 0.3+ 0.5+ 200620 Q11 0.1- 0.5- 200911 G96 0.2- 0.1+ 201213 Q11 0.5+ 0.2- 200624 215 0.9- 0.1- 200911 G96 0.2- 0.2+ 201213 Q11 0.5+ 0.2+ 200624 215 0.6- 0.3- 200911 G96 0.2- 0.2+ 200624 215 0.5- 0.4- 200911 G96 0.5- 0.1+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2021 Jan. 8

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