メタデータ
| 項目 |
値 |
| Designation |
C/2025 N2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-12-11T00:44:51.385920Z |
| Orbit solution date (soln_date, UTC) |
2025-12-18T15:12:23Z |
| Obs used |
47 |
| NEO |
- |
| M1 |
4.900 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-07-02T01:33:05.932800Z |
| Discovery magnitude (MPC) |
19.61 c |
| Discovery observatory (MPC) |
M22 · ATLAS South Africa, Sutherland |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2025-08-26.0000000 |
| e |
1.00252212 |
| q (au) |
8.983070 |
| a (au) |
-3561.711006 |
| i (deg) |
81.665566 |
| Ω (om, deg) |
94.465158 |
| ω (w, deg) |
230.022476 |
| M (ma, deg) |
0.001196 |
等級
散乱 + 全体線形
$$
M_a = (10.205 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.205 |
| n |
2.000 |
| gf |
0.811 |
| gb |
-0.569 |
| k |
0.892 |
| δ90 |
1.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
01:50:07.88 |
-72:51:40.5 |
HIP 8485 |
27.17 |
| 2026-03-26 12:00 |
01:51:00.52 |
-72:49:39.2 |
HIP 8485 |
25.99 |
| 2026-03-27 00:00 |
01:51:53.12 |
-72:47:38.5 |
HIP 8485 |
25.54 |
| 2026-03-27 12:00 |
01:52:45.67 |
-72:45:38.3 |
HIP 9183 |
25.74 |
| 2026-03-28 00:00 |
01:53:38.17 |
-72:43:38.7 |
HIP 9183 |
21.44 |
| 2026-03-28 12:00 |
01:54:30.63 |
-72:41:39.6 |
HIP 9183 |
17.17 |
| 2026-03-29 00:00 |
01:55:23.04 |
-72:39:41.1 |
HIP 9183 |
12.96 |
| 2026-03-29 12:00 |
01:56:15.41 |
-72:37:43.1 |
HIP 9183 |
8.91 |
| 2026-03-30 00:00 |
01:57:07.73 |
-72:35:45.6 |
HIP 9183 |
5.35 |
| 2026-03-30 12:00 |
01:58:00.00 |
-72:33:48.8 |
HIP 9183 |
3.99 |
| 2026-03-31 00:00 |
01:58:52.23 |
-72:31:52.5 |
HIP 9183 |
6.42 |
| 2026-03-31 12:00 |
01:59:44.41 |
-72:29:56.7 |
HIP 9183 |
10.22 |
| 2026-04-01 00:00 |
02:00:36.54 |
-72:28:01.5 |
HIP 9183 |
14.34 |
| 2026-04-01 12:00 |
02:01:28.63 |
-72:26:06.9 |
HIP 9183 |
18.57 |
| 2026-04-02 00:00 |
02:02:20.67 |
-72:24:12.9 |
HIP 9183 |
22.84 |
| 2026-04-02 12:00 |
02:03:12.67 |
-72:22:19.4 |
HIP 9684 |
26.45 |
| 2026-04-03 00:00 |
02:04:04.62 |
-72:20:26.5 |
HIP 9684 |
23.91 |
| 2026-04-03 12:00 |
02:04:56.52 |
-72:18:34.2 |
HIP 9684 |
21.99 |
| 2026-04-04 00:00 |
02:05:48.37 |
-72:16:42.5 |
HIP 9684 |
20.84 |
| 2026-04-04 12:00 |
02:06:40.18 |
-72:14:51.4 |
HIP 9684 |
20.60 |
| 2026-04-05 00:00 |
02:07:31.94 |
-72:13:00.8 |
HIP 10105 |
20.09 |
| 2026-04-05 12:00 |
02:08:23.65 |
-72:11:10.9 |
HIP 10105 |
19.90 |
| 2026-04-06 00:00 |
02:09:15.32 |
-72:09:21.5 |
HIP 10105 |
20.62 |
| 2026-04-06 12:00 |
02:10:06.94 |
-72:07:32.8 |
HIP 10105 |
22.17 |
| 2026-04-07 00:00 |
02:10:58.51 |
-72:05:44.6 |
HIP 10105 |
24.38 |
| 2026-04-07 12:00 |
02:11:50.04 |
-72:03:57.1 |
HIP 10105 |
27.10 |
| 2026-04-08 00:00 |
02:12:41.52 |
-72:02:10.2 |
HIP 10105 |
30.18 |
| 2026-04-08 12:00 |
02:13:32.95 |
-72:00:23.9 |
HIP 10405 |
28.23 |
| 2026-04-09 00:00 |
02:14:24.33 |
-71:58:38.2 |
HIP 10405 |
26.41 |
| 2026-04-09 12:00 |
02:15:15.67 |
-71:56:53.1 |
HIP 10405 |
25.24 |
| 2026-04-10 00:00 |
02:16:06.95 |
-71:55:08.7 |
HIP 10405 |
24.81 |
| 2026-04-10 12:00 |
02:16:58.19 |
-71:53:24.9 |
HIP 10941 |
24.04 |
| 2026-04-11 00:00 |
02:17:49.38 |
-71:51:41.7 |
HIP 10941 |
19.90 |
| 2026-04-11 12:00 |
02:18:40.53 |
-71:49:59.2 |
HIP 10941 |
15.88 |
| 2026-04-12 00:00 |
02:19:31.62 |
-71:48:17.3 |
HIP 10941 |
12.10 |
| 2026-04-12 12:00 |
02:20:22.66 |
-71:46:36.0 |
HIP 10941 |
8.87 |
| 2026-04-13 00:00 |
02:21:13.66 |
-71:44:55.5 |
HIP 10941 |
6.97 |
| 2026-04-13 12:00 |
02:22:04.61 |
-71:43:15.5 |
HIP 10941 |
7.51 |
| 2026-04-14 00:00 |
02:22:55.50 |
-71:41:36.2 |
HIP 10941 |
10.09 |
| 2026-04-14 12:00 |
02:23:46.35 |
-71:39:57.6 |
HIP 10941 |
13.60 |
| 2026-04-15 00:00 |
02:24:37.14 |
-71:38:19.7 |
HIP 10941 |
17.49 |
| 2026-04-15 12:00 |
02:25:27.89 |
-71:36:42.4 |
HIP 11598 |
19.22 |
| 2026-04-16 00:00 |
02:26:18.58 |
-71:35:05.8 |
HIP 11598 |
15.46 |