Nakano Note (Nakano wa Kangaeru noda) NK 4231 C/2020 U3 (Rankin)

The following improved orbital elements, by S. Nakano, are from 85 observations 2020 July 21 to Oct. 24. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.32 arc second. The comet has passed passed 2.01 AU from Saturn on 2018 Mar. 21 and 3.23 AU from Jupiter on 2019 Dec. 27 UT. See an orbit in CBET 4879 (same orbit). Epoch = 2021 Jan. 26.0 TT T = 2021 Feb. 5.97680 +/- 0.00077 (m.e.) TT Peri. = 124.26292 +/- 0.00122 Node = 282.67871 +/- 0.00043 (2000.0) Inc. = 30.17692 +/- 0.00012 q = 2.2761807 +/- 0.0000259 AU e = 0.9647948 +/- 0.0000120 1/a = +0.0154668 +/- 0.0000053 1/AU a = 64.65 AU P = 519.9 years origin = +0.015491 (Q= 7) future = +0.015173 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2020/ 200921 W16 0.3+ 0.3+ 201022 G96 0.0 0.3- 200721 F51 0.1- 0.0 200921 W16 0.3- 0.2+ 201022 I52 0.0 0.1+ 200721 F51 0.0 0.3+ 200921 W16 1.0- 0.3- 201022 I52 0.1- 0.1+ 200721 F51 0.2+ 0.2+ 200922 F51 0.1+ 0.1+ 201022 I52 0.3+ 0.6- 200731 F51 0.1+ 0.1+ 200922 F51 0.1- 0.0 201022 I52 0.1- 0.4- 200731 F51 0.3+ 0.0 200922 F51 0.0 0.0 201022 L01 0.1+ 0.0 200731 F51 0.1- 0.0 200922 F51 0.0 0.2+ 201022 B96 0.6+ 1.0- 200731 F51 0.1+ 0.1+ 200928 G96 0.2+ 0.1- 201022 L01 0.4+ 0.4- 200804 F51 0.1- 0.1+ 200928 G96 0.1- 0.3- 201022 B96 0.1- 0.6- 200804 F51 0.1- 0.0 200928 G96 0.1+ 0.2- 201022 L01 0.3+ 0.4- 200804 F51 0.2+ 0.3- 200928 G96 0.5+ 0.0 201022 B96 0.4+ 1.1- 200804 F51 0.2+ 0.0 201004 F52 0.0 0.2+ 201023 I52 0.2- 0.4- 200807 F52 0.0 0.1+ 201004 F52 0.1- 0.0 201023 I52 0.0 0.0 200807 F52 0.1+ 0.2- 201004 F52 0.0 0.1- 201023 I52 0.1+ 0.1- 200809 F51 0.1+ 0.2- 201004 F52 0.0 0.2+ 201023 I52 0.1- 0.4+ 200809 F51 0.2- 0.1- 201005 G96 0.5- 0.1+ 201023 H06 0.2- 0.0 200815 F52 0.1- 0.2- 201005 G96 0.5- 1.1+ 201023 H06 0.1- 0.0 200827 F52 0.6- 0.5- 201005 G96 0.4+ 0.6+ 201023 Z08 0.2- 0.0 200829 F51 0.1- 0.0 201005 G96 0.1- 0.4+ 201023 Z08 0.2- 0.4+ 200830 F51 0.1- 0.0 201011 G96 0.1+ 0.2- 201023 Z08 0.3- 0.2+ 200830 F51 0.2- 0.2- 201011 G96 0.2+ 0.1- 201023 Z08 0.4- 0.1- 200830 F51 0.1+ 0.0 201011 G96 0.0 0.1- 201024 N51 0.7+ 0.1- 200830 F51 0.0 0.1- 201011 G96 0.2+ 0.2- 201024 N51 0.7+ 0.1- 200902 F51 0.1+ 0.0 201014 F51 0.1- 0.1+ 201024 N51 0.8+ 0.5+ 200902 F51 0.2+ 0.2+ 201014 F51 0.0 0.0 201024 N51 0.7+ 0.1- 200916 G96 0.2- 0.3+ 201014 F51 0.2- 0.2+ 201024 N51 0.6+ 0.2- 200916 G96 0.0 0.1- 201022 G96 0.2+ 0.2- 201024 K61 1.4+ 0.5- 200916 G96 0.1+ 0.0 201022 G96 0.0 0.0 201024 K61 0.4+ 0.3- 200916 G96 0.0 0.1- 201022 G96 0.2- 0.0 ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2020 Oct. 28

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