メタデータ
| 項目 |
値 |
| Designation |
C/2025 D6 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-12-11T08:17:56.722560Z |
| Orbit solution date (soln_date, UTC) |
2025-10-28T16:12:42Z |
| Obs used |
144 |
| NEO |
- |
| M1 |
12.600 |
| K1 |
10.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-02-26T06:35:48.595200Z |
| Discovery magnitude (MPC) |
18.48 o |
| Discovery observatory (MPC) |
W68 · ATLAS Chile, Rio Hurtado |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2025-03-22.0000000 |
| e |
0.99797059 |
| q (au) |
2.503681 |
| a (au) |
1233.700697 |
| i (deg) |
145.789062 |
| Ω (om, deg) |
151.490101 |
| ω (w, deg) |
285.394018 |
| M (ma, deg) |
0.002289 |
等級
散乱 + 全体線形
$$
M_a = (12.398 + 4.428\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.398 |
| n |
4.428 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.943 |
| 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 |
08:49:41.63 |
+29:40:44.4 |
HIP 43340 |
13.83 |
| 2026-03-26 12:00 |
08:49:18.99 |
+29:42:24.2 |
HIP 43340 |
16.49 |
| 2026-03-27 00:00 |
08:48:56.65 |
+29:44:02.2 |
HIP 43340 |
20.11 |
| 2026-03-27 12:00 |
08:48:34.60 |
+29:45:38.4 |
HIP 43340 |
24.21 |
| 2026-03-28 00:00 |
08:48:12.85 |
+29:47:12.8 |
HIP 43340 |
28.55 |
| 2026-03-28 12:00 |
08:47:51.39 |
+29:48:45.5 |
HIP 43340 |
33.00 |
| 2026-03-29 00:00 |
08:47:30.23 |
+29:50:16.5 |
HIP 42938 |
32.04 |
| 2026-03-29 12:00 |
08:47:09.36 |
+29:51:45.8 |
HIP 42938 |
28.35 |
| 2026-03-30 00:00 |
08:46:48.78 |
+29:53:13.4 |
HIP 42938 |
25.07 |
| 2026-03-30 12:00 |
08:46:28.50 |
+29:54:39.4 |
HIP 42938 |
22.33 |
| 2026-03-31 00:00 |
08:46:08.51 |
+29:56:03.7 |
HIP 42938 |
20.30 |
| 2026-03-31 12:00 |
08:45:48.82 |
+29:57:26.4 |
HIP 42938 |
19.17 |
| 2026-04-01 00:00 |
08:45:29.41 |
+29:58:47.4 |
HIP 42938 |
19.05 |
| 2026-04-01 12:00 |
08:45:10.30 |
+30:00:06.9 |
HIP 42938 |
19.91 |
| 2026-04-02 00:00 |
08:44:51.48 |
+30:01:24.9 |
HIP 42938 |
21.59 |
| 2026-04-02 12:00 |
08:44:32.95 |
+30:02:41.2 |
HIP 42938 |
23.88 |
| 2026-04-03 00:00 |
08:44:14.71 |
+30:03:56.1 |
HIP 42938 |
26.59 |
| 2026-04-03 12:00 |
08:43:56.76 |
+30:05:09.4 |
HIP 42938 |
29.58 |
| 2026-04-04 00:00 |
08:43:39.09 |
+30:06:21.3 |
HIP 42658 |
26.79 |
| 2026-04-04 12:00 |
08:43:21.71 |
+30:07:31.7 |
HIP 42658 |
23.53 |
| 2026-04-05 00:00 |
08:43:04.62 |
+30:08:40.6 |
HIP 42658 |
20.56 |
| 2026-04-05 12:00 |
08:42:47.82 |
+30:09:48.0 |
HIP 42658 |
17.97 |
| 2026-04-06 00:00 |
08:42:31.30 |
+30:10:54.1 |
HIP 42658 |
15.91 |
| 2026-04-06 12:00 |
08:42:15.07 |
+30:11:58.7 |
HIP 42658 |
14.55 |
| 2026-04-07 00:00 |
08:41:59.12 |
+30:13:02.0 |
HIP 42658 |
14.04 |
| 2026-04-07 12:00 |
08:41:43.45 |
+30:14:03.9 |
HIP 42658 |
14.42 |
| 2026-04-08 00:00 |
08:41:28.07 |
+30:15:04.4 |
HIP 42658 |
15.59 |
| 2026-04-08 12:00 |
08:41:12.96 |
+30:16:03.6 |
HIP 42658 |
17.34 |
| 2026-04-09 00:00 |
08:40:58.14 |
+30:17:01.5 |
HIP 42658 |
19.49 |
| 2026-04-09 12:00 |
08:40:43.59 |
+30:17:58.1 |
HIP 42658 |
21.89 |
| 2026-04-10 00:00 |
08:40:29.32 |
+30:18:53.4 |
HIP 42658 |
24.44 |
| 2026-04-10 12:00 |
08:40:15.33 |
+30:19:47.4 |
HIP 42658 |
27.08 |
| 2026-04-11 00:00 |
08:40:01.62 |
+30:20:40.2 |
HIP 42389 |
28.46 |
| 2026-04-11 12:00 |
08:39:48.18 |
+30:21:31.7 |
HIP 42389 |
26.02 |
| 2026-04-12 00:00 |
08:39:35.02 |
+30:22:22.0 |
HIP 42389 |
23.77 |
| 2026-04-12 12:00 |
08:39:22.13 |
+30:23:11.1 |
HIP 42389 |
21.72 |
| 2026-04-13 00:00 |
08:39:09.51 |
+30:23:59.0 |
HIP 42389 |
19.93 |
| 2026-04-13 12:00 |
08:38:57.16 |
+30:24:45.8 |
HIP 42389 |
18.43 |
| 2026-04-14 00:00 |
08:38:45.08 |
+30:25:31.4 |
HIP 42389 |
17.28 |
| 2026-04-14 12:00 |
08:38:33.27 |
+30:26:15.8 |
HIP 42389 |
16.50 |
| 2026-04-15 00:00 |
08:38:21.73 |
+30:26:59.1 |
HIP 42389 |
16.14 |
| 2026-04-15 12:00 |
08:38:10.45 |
+30:27:41.3 |
HIP 42389 |
16.18 |
| 2026-04-16 00:00 |
08:37:59.44 |
+30:28:22.4 |
HIP 42389 |
16.60 |