Nakano Note (Nakano wa Kangaeru noda) NK 3677 P/2018 EN4 (NEOWISE)
The following improved orbital elements, by S. Nakano, are from 66 observations 2018 Mar. 9 to Aug. 9. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.38 arc second. Epoch = 2018 June 11.0 TT T = 2018 June 7.77848 +/- 0.00049 (m.e.) TT Peri. = 35.01149 +/- 0.00040 Node = 136.16505 +/- 0.00010 (2000.0) Inc. = 81.56221 +/- 0.00005 q = 1.4479540 +/- 0.0000053 AU e = 0.9214410 +/- 0.0000156 a = 18.4314131 +/- 0.0036579 AU n' = 0.01245564 +/- 0.00000371 P = 79.129 +/- 0.0235515 years (+/- 8.60 days) The predicted orbit for the 2094 return is as follows: T = 2094 Mar. 20.29722 TT Epoch = 2094 Mar. 24.0 TT Peri. = 34.88884 e = 0.9194063 Node = 136.01737 (2000.0) a = 18.0737734 AU Inc. = 81.97861 n'= 0.01282717 q = 1.4566321 AU P = 76.838 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2018/ 180315 Q62 0.5- 0.0 180517 568 0.2- 0.0 180309 C51 0.1+ 0.4+ 180316 474 0.8- 0.7+ 180601 H06 0.1+ 0.1+ 180309 C51 0.6- 0.2+ 180316 474 0.3- 0.2- 180601 H06 0.1- 0.1- 180309 C51 0.7- 0.1+ 180316 474 0.3+ 0.4+ 180601 H06 0.1- 0.1- 180309 C51 1.8+ 0.1+ 180317 I11 0.1+ 0.3+ 180603 H06 0.3- 0.1+ 180309 C51 0.8- 0.5- 180317 I11 0.0 0.2+ 180603 H06 0.5- 0.3+ 180313 807 0.2+ 0.1+ 180317 I11 0.1+ 0.3+ 180603 H06 0.1+ 0.5+ 180313 807 0.1+ 0.1+ 180317 I11 0.1- 0.3+ 180604 A71 0.1- 0.2- 180313 807 0.1+ 0.1- 180322 568 0.1+ 0.0 180604 A71 0.4- 0.1- 180313 691 0.9+ 1.1- 180322 568 0.1+ 0.1+ 180605 G40 0.3- 0.5- 180313 691 1.4+ 0.1- 180322 568 0.1+ 0.1+ 180605 G40 0.3+ 0.5- 180313 691 0.1- 0.1- 180322 568 0.1+ 0.1+ 180605 G40 0.8+ 0.1- 180313 204 0.5+ 0.3- 180513 U69 0.0 0.3+ 180609 204 0.2+ 0.2- 180313 204 0.1- 0.3+ 180513 U69 0.2- 0.1- 180609 204 0.0 0.2- 180314 H21 0.0 0.5- 180514 H06 0.4+ 0.1- 180609 204 0.3+ 0.1+ 180314 H21 0.3- 0.3- 180514 H06 0.1+ 0.2- 180612 Q11 0.6+ 0.6+ 180314 H21 0.2- 0.5- 180514 H06 0.2- 0.5- 180612 Q11 0.9+ 0.7+ 180314 I52 1.8- 0.5- 180515 G40 0.2+ 1.2- 180612 Q11 0.7+ 0.5+ 180314 I52 0.4- 0.3- 180515 G40 0.0 0.5- 180809 Q11 0.1- 0.2+ 180314 I52 0.1- 0.6- 180515 G40 0.3- 0.2+ 180809 Q11 0.1- 0.0 180314 I52 0.5- 0.0 180517 H06 0.2+ 0.1- 180809 Q11 0.0 0.1- 180315 Q62 0.2- 0.0 180517 H06 0.1+ 0.0 180315 Q62 0.3- 0.0 180517 568 0.1- 0.1+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2018 Aug. 12