Nakano Note (Nakano wa Kangaeru noda) NK 5431 C/2025 Q1 (ATLAS)
The following improved orbital elements, by S. Nakano, are from 18 observations 2020 Jan. 31 to 2025 Sept. 2. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.62 arc seconds. See an orbit in CBET 5599 (same orbit). Epoch = 2024 July 29.0 TT T = 2024 July 12.22514 +/- 0.11953 (m.e.) TT Peri. = 280.23759 +/- 0.00501 Node = 326.97870 +/- 0.00031 (2000.0) Inc. = 66.14939 +/- 0.00015 q = 10.1000600 +/- 0.0006658 AU e = 0.9912193 +/- 0.0003358 1/a = +0.0008694 +/- 0.0000332 1/AU origin = +0.000609 (Q= 8) 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(") 2020/ 250827 W68 0.3+ 0.7- 250827 807 0.1+ 0.1+ 200131 W84 0.1+ 0.0 250827 W68 0.8- 0.1+ 250831 L09 1.7+ 0.9- 2022/ 250827 W68 0.6- 1.2- 250831 L09 0.3+ 0.6+ 220224 W84 0.1+ 0.1+ 250827 W68 0.5+ 0.1+ 250831 L09 0.9+ 0.5- 221110 W84 0.1- 0.1+ 250827 X09 0.7- 0.1+ 250902 X09 0.5- 0.2- 2023/ 250827 X09 0.2- 0.2+ 250902 X09 1.1- 1.2- 230429 W84 0.3- 0.2- 250827 807 0.5+ 1.1+ 2025/ 250827 807 0.0 0.7+ Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag. 2025 07 24 21 27.52 -80 27.0 9.772 10.302 118.9 5.0 19.6 2025 08 03 21 07.33 -80 18.6 9.808 10.312 117.2 5.0 19.6 2025 08 13 20 48.07 -79 57.1 9.860 10.323 114.6 5.1 19.6 2025 08 23 20 31.31 -79 23.3 9.926 10.334 111.2 5.2 19.6 2025 09 02 20 18.01 -78 39.0 10.005 10.346 107.1 5.3 19.6 2025 09 12 20 08.49 -77 46.3 10.095 10.358 102.4 5.4 19.6 2025 09 22 20 02.54 -76 47.6 10.194 10.370 97.3 5.5 19.7 2025 10 02 19 59.79 -75 44.8 10.300 10.382 91.9 5.5 19.7 2025 10 12 19 59.74 -74 39.5 10.410 10.394 86.3 5.5 19.7 2025 10 22 20 01.88 -73 33.3 10.523 10.407 80.6 5.4 19.7 2025 11 01 20 05.82 -72 27.0 10.634 10.420 75.0 5.3 19.8 2025 11 11 20 11.16 -71 21.8 10.741 10.434 69.4 5.1 19.8 2025 11 21 20 17.60 -70 18.1 10.842 10.447 64.0 4.9 19.8 2025 12 01 20 24.88 -69 16.7 10.934 10.461 59.0 4.6 19.9 2025 12 11 20 32.77 -68 17.9 11.015 10.475 54.6 4.4 19.9 2025 12 21 20 41.09 -67 22.2 11.083 10.489 50.8 4.2 19.9 2025 12 31 20 49.67 -66 30.1 11.137 10.504 48.0 4.0 19.9 2026 01 10 20 58.38 -65 41.8 11.175 10.519 46.3 3.9 19.9 2026 01 20 21 07.09 -64 57.7 11.196 10.534 45.8 3.8 19.9 2026 01 30 21 15.69 -64 18.1 11.200 10.549 46.7 3.9 19.9 2026 02 09 21 24.07 -63 43.4 11.187 10.564 48.9 4.0 19.9 2026 02 19 21 32.14 -63 13.8 11.158 10.580 52.2 4.2 19.9 2026 03 01 21 39.80 -62 49.6 11.113 10.596 56.3 4.5 19.9 2026 03 11 21 46.97 -62 31.0 11.055 10.612 61.2 4.7 19.9 2026 03 21 21 53.55 -62 18.2 10.983 10.629 66.7 4.9 19.9 2026 03 31 21 59.45 -62 11.3 10.902 10.646 72.6 5.1 19.9 m1 = 6.5 + 5 log Delta + 8.0 log r ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2025 Sept. 2