Nakano Note (Nakano wa Kangaeru noda) NK 4383 C/2020 S4 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 111 observations 2020 Sept. 16 to Dec. 17. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.34 arc second. The comet has passed 7.12 AU from Uranus on 2014 Dec. 15 UT. See an orbit in CBET 4863. Epoch = 2023 Feb. 25.0 TT T = 2023 Feb. 9.31162 +/- 0.05133 (m.e.) TT Peri. = 20.99403 +/- 0.00185 Node = 117.72264 +/- 0.00086 (2000.0) Inc. = 20.56957 +/- 0.00008 q = 3.3697507 +/- 0.0002094 AU e = 1.0011018 +/- 0.0000929 1/a = -0.0003270 +/- 0.0000276 1/AU origin = +0.000073 (Q= 6) future = -0.000755 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2020/ 200923 G96 0.2- 0.1+ 201008 F51 0.0 0.1+ 200916 F51 0.1- 0.1+ 200923 G96 0.0 0.1- 201008 F51 0.0 0.1- 200916 F51 0.1- 0.0 200923 G96 1.1- 0.2- 201009 941 0.8+ 0.5+ 200916 F51 0.0 0.0 200923 G96 0.5- 0.0 201009 941 0.3+ 0.3+ 200916 F51 0.0 0.0 200924 E10 0.2- 0.2+ 201009 941 0.3- 0.1+ 200917 711 0.1- 0.8- 200924 E10 0.1- 0.1+ 201020 G96 0.4- 0.2- 200917 711 (2.2- 19.1-) 200924 E10 0.0 0.0 201020 G96 0.2- 0.2+ 200917 711 0.0 0.6- 200924 E10 0.0 0.2+ 201020 G96 0.3- 0.0 200917 568 0.1+ 0.1+ 200924 E10 0.1- 0.2+ 201020 G96 0.1- 0.1- 200917 568 0.1+ 0.1+ 200924 E10 0.1+ 0.3+ 201024 F51 0.1+ 0.0 200917 568 0.1+ 0.1+ 200924 E10 0.2+ 0.2+ 201024 F51 0.2- 0.1- 200917 F51 0.1- 0.0 200924 E10 0.1+ 0.0 201024 F51 0.1+ 0.0 200917 F51 0.0 0.0 200925 I52 0.3- 0.1+ 201108 568 0.2+ 0.0 200917 F51 0.1+ 0.0 200925 I52 0.6- 0.3- 201108 568 0.2+ 0.0 200917 F51 0.0 0.0 200925 I52 0.5- 0.5- 201108 215 1.4- 0.6- 200918 F51 0.1+ 0.1- 200925 I52 0.4- 0.7- 201108 215 1.4- 0.3- 200918 F51 0.0 0.1+ 200925 F51 0.0 0.1+ 201108 215 1.8- 0.9- 200918 F65 0.2- 0.2+ 200925 F51 0.3- 0.1- 201109 F52 0.1- 0.0 200918 F65 0.0 0.2+ 200925 F51 0.0 0.1+ 201109 F52 0.1- 0.2+ 200918 F65 0.0 0.1+ 200925 F51 0.1- 0.1- 201109 F52 0.1- 0.3+ 200918 F51 0.0 0.1- 200926 F51 0.1+ 0.1+ 201111 568 0.4+ 0.0 200918 F51 0.0 0.0 200926 F51 0.0 0.1- 201111 568 0.1+ 0.1- 200918 F51 0.0 0.0 200926 F51 0.0 0.2+ 201111 568 0.2+ 0.0 200918 F51 0.1+ 0.1- 200926 Q62 0.7- 0.4- 201111 568 0.2+ 0.1+ 200918 F51 0.1- 0.0 200926 Q62 0.8- 0.7- 201114 F52 0.2- 0.2+ 200918 F51 0.0 0.0 200927 I52 0.5- 0.5- 201114 F52 0.2- 0.1- 200918 E94 1.2- 1.7+ 200927 I52 0.1- 0.0 201114 F52 0.0 0.0 200918 E94 0.2- 0.1- 200927 I52 0.4- 0.2+ 201117 G96 0.1- 0.1- 200918 E94 0.7+ 0.1- 200927 I52 0.4- 0.3- 201117 G96 0.4- 0.3- 200919 L01 0.5- 0.5- 200927 F52 0.0 0.0 201117 G96 0.2- 0.1- 200919 L01 0.6- 0.2- 200927 F52 0.1- 0.0 201117 G96 0.2- 0.1- 200919 L01 0.1+ 0.5- 200927 F52 0.2+ 0.1+ 201119 F51 0.1- 0.0 200920 F51 0.2+ 0.0 200927 F51 0.1+ 0.0 201119 F51 0.1- 0.0 200920 F51 0.3+ 0.0 200927 F51 0.0 0.1- 201119 F51 0.0 0.0 200920 F51 0.1- 0.1+ 200927 F51 0.2+ 0.0 201119 F51 0.0 0.0 200922 F51 0.1- 0.1- 200927 F51 0.0 0.0 201217 568 0.1+ 0.1- 200922 F51 0.1+ 0.1+ 201008 F51 0.2+ 0.1- 201217 568 0.0 0.0 200922 F51 0.1- 0.2- 201008 F51 0.0 0.3- ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2021 Jan. 29

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