Nakano Note (Nakano wa Kangaeru noda) NK 4284 A/2017 MC9

The following improved orbital elements, by S. Nakano, are from 25 observations 2017 June 22 to Sept. 11. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.42 arc second. Epoch = 2017 July 26.0 TT T = 2017 July 11.07558 +/- 0.00343 (m.e.) TT Peri. = 222.06295 +/- 0.00265 Node = 80.20316 +/- 0.00089 (2000.0) Inc. = 15.60863 +/- 0.00047 q = 1.6099205 +/- 0.0000184 AU e = 0.5246987 +/- 0.0000330 a = 3.3871578 +/- 0.0002383 AU n' = 0.15810694 +/- 0.00001669 P = 6.234 +/- 0.0006579 years (+/- 0.24 day) The predicted orbit for the 2023 return is as follows: T = 2023 Oct. 7.72341 TT Epoch = 2023 Oct. 23.0 TT Peri. = 222.24184 e = 0.5248155 Node = 80.12844 (2000.0) a = 3.3858307 AU Inc. = 15.60298 n'= 0.15819991 q = 1.6088944 AU P = 6.230 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2017/ 170702 807 0.7- 0.5- 170703 807 0.6- 0.4- 170622 F51 0.2+ 0.0 170702 807 1.1- 0.7- 170703 W84 0.6+ 0.1+ 170622 F51 0.1+ 0.0 170702 807 0.1- 0.4- 170717 W84 0.7+ 0.3+ 170622 F51 0.0 0.1- 170702 807 0.9- 0.2- 170717 W84 0.5+ 0.4+ 170622 F51 0.0 0.2+ 170702 807 0.3- 0.1- 170825 W84 0.3+ 0.3- 170623 291 0.3- 0.4- 170702 W84 0.5+ 0.1+ 170825 W84 0.3+ 0.3- 170623 291 0.3+ 0.3+ 170702 W84 0.8+ 0.1- 170902 W84 0.1+ 0.0 170623 291 0.1- 0.4+ 170703 807 0.7- 0.2+ 170911 W84 0.5- 0.7+ 170702 807 0.6- 0.6- 170703 807 1.3- 0.3-

Associate of the CBAT Late edition Syuichi Nakano 2020 Sept. 13

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