Nakano Note (Nakano wa Kangaeru noda) NK 5420 C/2025 N2 (ATLAS)
The following improved orbital elements, by S. Nakano, are from 35 observations 2023 July 13 to 2025 July 8. 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. See an orbit in CBET 5580 (same orbit). Epoch = 2024 Nov. 26.0 TT T = 2024 Dec. 12.92836 +/- 0.10418 (m.e.) TT Peri. = 230.12304 +/- 0.00521 Node = 94.46084 +/- 0.00027 (2000.0) Inc. = 81.66283 +/- 0.00015 q = 8.9846850 +/- 0.0001355 AU e = 1.0029119 +/- 0.0001269 1/a = -0.0003241 +/- 0.0000141 1/AU origin = +0.000071 (Q= 8) future = +0.000054 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2023/ 250606 W68 0.1- 1.8- 250702 X07 0.5+ 0.1- 230713 W84 0.4- 0.0 250618 W68 1.2- 1.3+ 250702 X07 0.4+ 0.5- 231025 W84 0.4+ 0.1- 250618 W68 (2.7- 1.3+) 250707 X09 0.2+ 0.3- 2025/ 250618 W68 0.8- 0.7+ 250707 X09 0.3+ 0.7+ 250507 M22 1.3+ 0.1- 250624 W68 0.9- 0.2+ 250707 X09 0.5+ 0.3+ 250507 M22 0.3+ 0.9+ 250624 W68 1.3- 0.1+ 250707 Q62 0.1- 0.5+ 250507 M22 0.4+ 0.9+ 250624 W68 0.2+ 0.7- 250707 Q62 0.1- 0.0 250507 M22 0.3- 0.8+ 250702 M22 0.3- 0.2- 250707 Q62 0.3- 0.0 250606 W68 0.5- 0.5+ 250702 M22 0.0 0.2- 250707 Q62 0.5+ 0.2- 250606 W68 0.4- 1.9- 250702 M22 0.3- 0.2- 250707 Q62 0.2+ 0.2+ 250606 W68 0.1+ 0.4- 250702 M22 0.2- 0.3- 250708 X07 0.4+ 0.3+ 250606 W68 0.6+ 0.0 250702 M22 0.5+ 0.1+ 250708 X07 0.2+ 0.4+ 250606 W68 0.9+ 0.3- 250702 X09 0.5- 0.7+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2025 July 9