C/2025 Q1 (ATLAS)
メタデータ
| 項目 |
値 |
| Designation |
C/2025 Q1 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-07-12T01:27:00.011520Z |
| Orbit solution date (soln_date, UTC) |
2025-12-12T11:12:31Z |
| Obs used |
24 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
8.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-08-27T05:43:50.505600Z |
| Discovery magnitude (MPC) |
19.88 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) |
2025-01-29.0000000 |
| e |
0.99127748 |
| q (au) |
10.099968 |
| a (au) |
1157.918555 |
| i (deg) |
66.152955 |
| Ω (om, deg) |
326.964441 |
| ω (w, deg) |
280.236072 |
| M (ma, deg) |
0.005026 |
等級
散乱 + 全体線形
$$
M_a = (-1.324 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
-1.324 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.502 |
| k |
1.000 |
| δ90 |
10.000 |
| 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) |
| 2026-02-03 00:00 |
21:19:04.17 |
-64:03:36.1 |
HIP 105449 |
15.95 |
| 2026-02-03 12:00 |
21:19:29.38 |
-64:01:50.7 |
HIP 105449 |
13.39 |
| 2026-02-04 00:00 |
21:19:54.55 |
-64:00:06.1 |
HIP 105449 |
11.19 |
| 2026-02-04 12:00 |
21:20:19.68 |
-63:58:22.3 |
HIP 105449 |
9.61 |
| 2026-02-05 00:00 |
21:20:44.77 |
-63:56:39.2 |
HIP 105449 |
8.96 |
| 2026-02-05 12:00 |
21:21:09.82 |
-63:54:56.8 |
HIP 105449 |
9.43 |
| 2026-02-06 00:00 |
21:21:34.83 |
-63:53:15.2 |
HIP 105449 |
10.88 |
| 2026-02-06 12:00 |
21:21:59.79 |
-63:51:34.4 |
HIP 105449 |
12.96 |
| 2026-02-07 00:00 |
21:22:24.72 |
-63:49:54.3 |
HIP 105449 |
15.43 |
| 2026-02-07 12:00 |
21:22:49.60 |
-63:48:15.0 |
HIP 105449 |
18.12 |
| 2026-02-08 00:00 |
21:23:14.44 |
-63:46:36.4 |
HIP 105803 |
16.85 |
| 2026-02-08 12:00 |
21:23:39.23 |
-63:44:58.6 |
HIP 105803 |
15.02 |
| 2026-02-09 00:00 |
21:24:03.98 |
-63:43:21.6 |
HIP 105803 |
13.68 |
| 2026-02-09 12:00 |
21:24:28.68 |
-63:41:45.3 |
HIP 105803 |
12.98 |
| 2026-02-10 00:00 |
21:24:53.34 |
-63:40:09.8 |
HIP 105803 |
13.02 |
| 2026-02-10 12:00 |
21:25:17.95 |
-63:38:35.1 |
HIP 105803 |
13.79 |
| 2026-02-11 00:00 |
21:25:42.51 |
-63:37:01.1 |
HIP 105803 |
15.17 |
| 2026-02-11 12:00 |
21:26:07.02 |
-63:35:28.0 |
HIP 105803 |
17.01 |
| 2026-02-12 00:00 |
21:26:31.48 |
-63:33:55.6 |
HIP 105803 |
19.18 |
| 2026-02-12 12:00 |
21:26:55.90 |
-63:32:24.0 |
HIP 106096 |
17.20 |
| 2026-02-13 00:00 |
21:27:20.26 |
-63:30:53.2 |
HIP 106096 |
14.57 |
| 2026-02-13 12:00 |
21:27:44.57 |
-63:29:23.1 |
HIP 106096 |
12.16 |
| 2026-02-14 00:00 |
21:28:08.83 |
-63:27:53.9 |
HIP 106096 |
10.13 |
| 2026-02-14 12:00 |
21:28:33.03 |
-63:26:25.5 |
HIP 106096 |
8.73 |
| 2026-02-15 00:00 |
21:28:57.18 |
-63:24:57.8 |
HIP 106096 |
8.28 |
| 2026-02-15 12:00 |
21:29:21.28 |
-63:23:31.0 |
HIP 106096 |
8.91 |
| 2026-02-16 00:00 |
21:29:45.32 |
-63:22:05.0 |
HIP 106096 |
10.42 |
| 2026-02-16 12:00 |
21:30:09.30 |
-63:20:39.7 |
HIP 106096 |
12.49 |
| 2026-02-17 00:00 |
21:30:33.23 |
-63:19:15.3 |
HIP 106196 |
12.86 |
| 2026-02-17 12:00 |
21:30:57.09 |
-63:17:51.7 |
HIP 106196 |
11.64 |
| 2026-02-18 00:00 |
21:31:20.90 |
-63:16:28.9 |
HIP 106196 |
11.13 |
| 2026-02-18 12:00 |
21:31:44.65 |
-63:15:06.9 |
HIP 106196 |
11.44 |
| 2026-02-19 00:00 |
21:32:08.34 |
-63:13:45.7 |
HIP 106277 |
11.54 |
| 2026-02-19 12:00 |
21:32:31.97 |
-63:12:25.3 |
HIP 106277 |
11.58 |
| 2026-02-20 00:00 |
21:32:55.54 |
-63:11:05.8 |
HIP 106277 |
12.38 |
| 2026-02-20 12:00 |
21:33:19.04 |
-63:09:47.1 |
HIP 106277 |
13.79 |
| 2026-02-21 00:00 |
21:33:42.48 |
-63:08:29.2 |
HIP 106277 |
15.64 |
| 2026-02-21 12:00 |
21:34:05.86 |
-63:07:12.1 |
HIP 106618 |
14.21 |
| 2026-02-22 00:00 |
21:34:29.17 |
-63:05:55.8 |
HIP 106618 |
11.39 |
| 2026-02-22 12:00 |
21:34:52.41 |
-63:04:40.4 |
HIP 106618 |
8.66 |
| 2026-02-23 00:00 |
21:35:15.59 |
-63:03:25.8 |
HIP 106618 |
6.11 |
| 2026-02-23 12:00 |
21:35:38.70 |
-63:02:12.0 |
HIP 106618 |
4.10 |
| 2026-02-24 00:00 |
21:36:01.74 |
-63:00:59.1 |
HIP 106618 |
3.62 |