Nakano Note (Nakano wa Kangaeru noda) NK 4398 C/2020 H5 (Robinson)
The following improved orbital elements, by S. Nakano, are from 78 observations 2020 Apr. 22 to 2021 Mar. 13. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.46 arc second. The last observatuins on 2021 Feb. 8 show the residual of 31" from an orbit in HICQ 2021. See an orbit in CBET 4767. Epoch = 2020 Dec. 17.0 TT T = 2020 Dec. 11.82924 +/- 0.20435 (m.e.) TT Peri. = 326.39238 +/- 0.00998 Node = 210.64187 +/- 0.00029 (2000.0) Inc. = 70.21019 +/- 0.00029 q = 9.3454567 +/- 0.0001312 AU e = 0.9974946 +/- 0.0000673 1/a = +0.0002681 +/- 0.0000072 1/AU origin = +0.000129 (Q= 7) future = +0.000241 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2020/ 200428 474 0.2- 0.2- 200518 T08 0.9- 0.8+ 200422 T05 0.9+ 0.9- 200428 E94 0.4- 0.3- 200519 474 0.1+ 0.2- 200422 T05 0.3+ 1.2- 200428 E94 0.4- 0.5- 200519 474 0.0 0.2- 200422 T05 0.2- 0.6- 200428 E94 0.0 0.7+ 200519 474 0.0 0.3- 200422 T05 (0.7+ 2.3-) 200428 323 0.1+ 0.9+ 200519 474 0.0 0.3- 200424 E94 0.5- 0.7+ 200428 323 0.1+ 0.2+ 200520 323 0.1- 0.3- 200424 E94 0.6- 0.2+ 200429 323 0.6+ 0.3- 200520 323 0.2- 0.2+ 200424 E94 0.4- 0.3- 200429 323 0.1+ 0.7+ 200611 Q62 0.2- 0.1- 200424 E94 0.1+ 0.9- 200429 W88 1.2+ 0.4+ 200611 Q62 0.2+ 0.4- 200424 Q62 0.2- 0.0 200429 W88 1.2+ 0.7+ 201218 Q62 0.6- 0.2+ 200424 Q62 0.4- 0.0 200430 X31 0.1+ 0.7+ 201218 Q62 0.3- 0.4+ 200424 X31 0.7+ 0.1- 200430 W88 0.2+ 0.6- 201218 Q62 0.1+ 0.8+ 200424 X31 0.5+ 0.2- 200430 X31 0.7+ 0.1+ 2021/ 200425 E94 0.2- 0.4+ 200430 W88 0.2+ 0.4- 210117 T08 0.1- 0.7+ 200425 E94 0.4+ 0.5+ 200502 W88 0.0 0.1+ 210117 T08 0.8- 0.5- 200425 E94 0.5+ 0.1- 200502 W88 0.3+ 0.0 210117 T08 0.1- 0.3- 200425 E23 0.6- 0.1+ 200502 W88 0.0 0.0 210117 T08 1.0+ 0.4+ 200425 E23 0.9- 0.3+ 200502 E23 0.1- 0.3+ 210208 X03 1.0+ 0.4- 200425 E23 0.5- 0.4- 200502 E23 0.0 0.5+ 210208 X03 0.2+ 0.3- 200426 323 0.0 0.3- 200502 E23 0.3+ 0.3- 210208 X03 0.6- 0.1+ 200426 323 0.5+ 0.2+ 200511 Q62 0.5- 0.0 210208 X03 0.1+ 0.3+ 200428 E94 0.3+ 0.1+ 200511 Q62 0.0 0.0 210208 X03 0.5- 0.4- 200428 E94 0.7- 0.7+ 200514 Q62 0.1+ 0.2+ 210208 X03 0.3+ 0.1- 200428 E94 1.7- 0.3+ 200514 Q62 0.2+ 0.2+ 210313 474 0.4- 0.4- 200428 474 0.3- 0.4- 200518 T08 0.7+ 0.5+ 210313 474 0.1+ 0.2- 200428 474 0.2- 0.2- 200518 T08 0.2+ 0.5- 210313 474 0.4+ 0.0 200428 474 0.1- 0.3- 200518 T08 0.0 0.1- 210313 474 0.0 0.1+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2021 Mar. 19