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) |
| 2026-07-29 00:00 |
08:58:15.60 |
+30:18:40.5 |
HIP 44031 |
5.92 |
| 2026-07-29 12:00 |
08:58:29.00 |
+30:18:38.1 |
HIP 44031 |
8.01 |
| 2026-07-30 00:00 |
08:58:42.41 |
+30:18:36.0 |
HIP 44087 |
9.52 |
| 2026-07-30 12:00 |
08:58:55.81 |
+30:18:34.2 |
HIP 44087 |
9.58 |
| 2026-07-31 00:00 |
08:59:09.22 |
+30:18:32.8 |
HIP 44087 |
10.47 |
| 2026-07-31 12:00 |
08:59:22.62 |
+30:18:31.7 |
HIP 44176 |
8.07 |
| 2026-08-01 00:00 |
08:59:36.03 |
+30:18:30.9 |
HIP 44176 |
5.81 |
| 2026-08-01 12:00 |
08:59:49.43 |
+30:18:30.4 |
HIP 44176 |
4.40 |
| 2026-08-02 00:00 |
09:00:02.82 |
+30:18:30.3 |
HIP 44176 |
4.65 |
| 2026-08-02 12:00 |
09:00:16.21 |
+30:18:30.6 |
HIP 44176 |
6.38 |
| 2026-08-03 00:00 |
09:00:29.60 |
+30:18:31.2 |
HIP 44176 |
8.75 |
| 2026-08-03 12:00 |
09:00:42.98 |
+30:18:32.1 |
HIP 44176 |
11.36 |
| 2026-08-04 00:00 |
09:00:56.36 |
+30:18:33.4 |
HIP 44176 |
14.09 |
| 2026-08-04 12:00 |
09:01:09.72 |
+30:18:35.1 |
HIP 44330 |
16.78 |
| 2026-08-05 00:00 |
09:01:23.08 |
+30:18:37.1 |
HIP 44330 |
15.85 |
| 2026-08-05 12:00 |
09:01:36.43 |
+30:18:39.6 |
HIP 44330 |
15.40 |
| 2026-08-06 00:00 |
09:01:49.77 |
+30:18:42.3 |
HIP 44330 |
15.48 |
| 2026-08-06 12:00 |
09:02:03.10 |
+30:18:45.5 |
HIP 44330 |
16.07 |
| 2026-08-07 00:00 |
09:02:16.42 |
+30:18:49.1 |
HIP 44426 |
16.75 |
| 2026-08-07 12:00 |
09:02:29.73 |
+30:18:53.0 |
HIP 44426 |
15.08 |
| 2026-08-08 00:00 |
09:02:43.02 |
+30:18:57.4 |
HIP 44426 |
13.82 |
| 2026-08-08 12:00 |
09:02:56.30 |
+30:19:02.1 |
HIP 44426 |
13.08 |
| 2026-08-09 00:00 |
09:03:09.56 |
+30:19:07.2 |
HIP 44426 |
12.97 |
| 2026-08-09 12:00 |
09:03:22.81 |
+30:19:12.8 |
HIP 44426 |
13.48 |
| 2026-08-10 00:00 |
09:03:36.04 |
+30:19:18.8 |
HIP 44426 |
14.55 |
| 2026-08-10 12:00 |
09:03:49.26 |
+30:19:25.2 |
HIP 44426 |
16.07 |
| 2026-08-11 00:00 |
09:04:02.46 |
+30:19:32.0 |
HIP 44426 |
17.92 |
| 2026-08-11 12:00 |
09:04:15.63 |
+30:19:39.3 |
HIP 44426 |
20.01 |
| 2026-08-12 00:00 |
09:04:28.79 |
+30:19:46.9 |
HIP 44426 |
22.27 |
| 2026-08-12 12:00 |
09:04:41.93 |
+30:19:55.1 |
HIP 44687 |
22.09 |
| 2026-08-13 00:00 |
09:04:55.04 |
+30:20:03.7 |
HIP 44687 |
19.31 |
| 2026-08-13 12:00 |
09:05:08.13 |
+30:20:12.7 |
HIP 44687 |
16.55 |
| 2026-08-14 00:00 |
09:05:21.20 |
+30:20:22.2 |
HIP 44687 |
13.83 |
| 2026-08-14 12:00 |
09:05:34.24 |
+30:20:32.1 |
HIP 44687 |
11.17 |
| 2026-08-15 00:00 |
09:05:47.26 |
+30:20:42.6 |
HIP 44687 |
8.62 |
| 2026-08-15 12:00 |
09:06:00.24 |
+30:20:53.4 |
HIP 44687 |
6.30 |
| 2026-08-16 00:00 |
09:06:13.21 |
+30:21:04.8 |
HIP 44687 |
4.59 |
| 2026-08-16 12:00 |
09:06:26.14 |
+30:21:16.7 |
HIP 44687 |
4.27 |
| 2026-08-17 00:00 |
09:06:39.04 |
+30:21:29.0 |
HIP 44687 |
5.57 |
| 2026-08-17 12:00 |
09:06:51.92 |
+30:21:41.8 |
HIP 44687 |
7.71 |
| 2026-08-18 00:00 |
09:07:04.76 |
+30:21:55.2 |
HIP 44687 |
10.17 |
| 2026-08-18 12:00 |
09:07:17.57 |
+30:22:09.0 |
HIP 44687 |
12.76 |
| 2026-08-19 00:00 |
09:07:30.35 |
+30:22:23.3 |
HIP 44856 |
11.97 |