Nakano Note (Nakano wa Kangaeru noda) NK 5093 C/2018 E2 (Barros)
The following improved orbital elements, by S. Nakano, are from 62 observations 2015 May 23 to 2020 Jan. 3. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.60 arc second. The comet has passed 1.76 AU from Saturn on 2015 Feb. 26 UT. The 2015, 2016, 2017 and 2020 observations were reported on 2022 July MPCs, so that orbit was great improved. See the previous orbit in NK 4008. Epoch = 2018 Jan. 2.0 TT T = 2017 Dec. 23.67184 +/- 0.00064 (m.e.) TT Peri. = 277.47922 +/- 0.00010 Node = 67.20285 +/- 0.00005 (2000.0) Inc. = 97.74233 +/- 0.00004 q = 3.9222734 +/- 0.0000038 AU e = 0.9974711 +/- 0.0000095 1/a = +0.0006448 +/- 0.0000024 1/AU origin = +0.000603 (Q= 9) future = +0.000694 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2015/ 180314 W96 0.4+ 0.1- 180403 Q62 0.8- 0.2+ 150523 W84 0.7+ 0.1+ 180314 W96 0.5- 0.4+ 180413 474 0.3+ 0.3+ 2016/ 180314 I47 0.1+ 0.1- 180413 474 0.5- 0.1+ 160528 W84 0.0 0.2- 180314 I47 0.1- 0.1+ 180413 474 0.6- 0.0 160528 W84 0.1+ 0.1- 180314 W96 0.5- 0.7+ 180413 474 0.9- 0.6+ 2017/ 180314 W96 0.8- 0.0 180413 474 0.0 0.1+ 170620 W84 0.0 0.5+ 180314 I47 0.4+ 0.1- 180507 Q62 1.0- 0.1+ 2018/ 180314 I47 0.2+ 0.4+ 180507 Q62 0.8- 0.3+ 180312 Y00 0.1- 0.1- 180314 Q62 0.7- 0.5+ 180507 Q62 1.0- 0.3+ 180312 Y00 1.7+ 0.3- 180314 Q62 0.6- 0.4+ 180512 474 0.4- 0.5+ 180312 Y00 0.1- 0.2- 180314 Q62 0.7- 0.6+ 180512 474 0.6- 0.4+ 180312 Y00 1.2+ 1.2- 180315 Y00 0.2- 0.5- 180512 474 0.9+ 0.5- 180312 Y00 0.3- 0.0 180315 Y00 0.4- 0.4+ 181206 474 1.4- 0.4- 180312 Y00 1.1+ 0.8+ 180315 Y00 0.7+ 0.9- 181206 474 0.4- 0.9+ 180312 Y00 0.9+ 0.5- 180315 Y00 0.6+ 0.7- 181206 474 0.1+ 0.6- 180312 Y00 0.5+ 0.4- 180315 Y00 0.1+ 0.6+ 181206 474 0.5- 0.2- 180312 Y00 0.8+ 0.6- 180315 Y00 0.1+ 0.2+ 2019/ 180312 Y00 0.1- 0.5- 180315 Y00 1.0+ 0.0 190107 474 0.2+ 0.6+ 180313 Y00 1.7+ 0.8- 180316 474 0.4- 0.1+ 190107 474 1.0+ 0.9- 180313 Y00 1.8+ 0.6- 180316 474 0.9- 0.2- 190107 474 0.1+ 0.1+ 180313 807 0.2- 0.2- 180316 474 0.2- 0.5- 2020/ 180313 807 0.1- 0.2- 180403 Q62 1.0- 0.3+ 200103 W84 0.6+ 0.3+ 180313 807 0.2+ 0.2+ 180403 Q62 0.7- 0.3+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2023 Nov. 29