Nakano Note (Nakano wa Kangaeru noda) NK 4008 C/2018 E2 (Barros)
The following improved orbital elements, by S. Nakano, are from 57 observations 2018 Mar. 12 to 2019 Jan. 7. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.59 arc second. The comet has passed 1.76 AU from Saturn on 2015 Feb. 26 UT. See an orbit in HICQ 2019. Epoch = 2018 Jan. 2.0 TT T = 2017 Dec. 23.66397 +/- 0.00405 (m.e.) TT Peri. = 277.47742 +/- 0.00089 Node = 67.20261 +/- 0.00010 (2000.0) Inc. = 97.74237 +/- 0.00010 q = 3.9222743 +/- 0.0000247 AU e = 0.9975931 +/- 0.0000421 1/a = +0.0006136 +/- 0.0000107 1/AU origin = +0.000572 (Q= 7) future = +0.000663 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2018/ 180314 W96 0.6- 0.7+ 180413 474 0.3+ 0.2+ 180312 Y00 0.2- 0.1- 180314 W96 0.8- 0.0 180413 474 0.4- 0.0 180312 Y00 1.6+ 0.2- 180314 I47 0.3+ 0.0 180413 474 0.5- 0.0 180312 Y00 0.1- 0.1- 180314 I47 0.2+ 0.5+ 180413 474 0.9- 0.5+ 180312 Y00 1.1+ 1.1- 180314 Q62 0.7- 0.5+ 180413 474 0.0 0.0 180312 Y00 0.4- 0.1+ 180314 Q62 0.6- 0.5+ 180507 Q62 0.8- 0.0 180312 Y00 1.1+ 0.9+ 180314 Q62 0.7- 0.6+ 180507 Q62 0.6- 0.2+ 180312 Y00 0.8+ 0.5- 180315 Y00 0.2- 0.5- 180507 Q62 0.8- 0.2+ 180312 Y00 0.5+ 0.4- 180315 Y00 0.5- 0.4+ 180512 474 0.2- 0.4+ 180312 Y00 0.7+ 0.5- 180315 Y00 0.7+ 0.8- 180512 474 0.4- 0.3+ 180312 Y00 0.1- 0.5- 180315 Y00 0.6+ 0.7- 180512 474 1.1+ 0.6- 180313 Y00 1.6+ 0.8- 180315 Y00 0.1+ 0.7+ 181206 474 0.7- 0.6- 180313 Y00 1.7+ 0.5- 180315 Y00 0.0 0.2+ 181206 474 0.3+ 0.7+ 180313 807 0.3- 0.1- 180315 Y00 0.9+ 0.0 181206 474 0.8+ 0.8- 180313 807 0.2- 0.1- 180316 474 0.5- 0.1+ 181206 474 0.2+ 0.4- 180313 807 0.1+ 0.3+ 180316 474 0.9- 0.2- 2019/ 180314 W96 0.4+ 0.1- 180316 474 0.3- 0.5- 190107 474 0.2- 0.9+ 180314 W96 0.6- 0.5+ 180403 Q62 1.0- 0.2+ 190107 474 0.7+ 0.5- 180314 I47 0.0 0.0 180403 Q62 0.7- 0.2+ 190107 474 0.3- 0.5+ 180314 I47 0.2- 0.2+ 180403 Q62 0.8- 0.1+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2019 Dec. 30