C/2024 C4 (ATLAS)
メタデータ
| 項目 |
値 |
| Designation |
C/2024 C4 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-01-30T04:46:56.107200Z |
| Orbit solution date (soln_date, UTC) |
2024-08-18T18:42:14Z |
| Obs used |
545 |
| NEO |
- |
| M1 |
14.700 |
| K1 |
9.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2024-02-14T01:57:11.318400Z |
| Discovery magnitude (MPC) |
17.45 o |
| 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) |
2024-04-20.0000000 |
| e |
0.98249391 |
| q (au) |
1.471267 |
| a (au) |
84.043133 |
| i (deg) |
79.287579 |
| Ω (om, deg) |
220.685068 |
| ω (w, deg) |
321.524084 |
| M (ma, deg) |
0.103363 |
等級
散乱 + 全体線形
$$
M_a = (13.966 + 4.002\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.966 |
| n |
4.002 |
| gf |
1.000 |
| gb |
-0.751 |
| k |
0.989 |
| 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 |
19:19:46.69 |
+51:47:57.4 |
HIP 94896 |
28.73 |
| 2026-02-03 12:00 |
19:20:13.11 |
+51:50:08.9 |
HIP 95218 |
25.77 |
| 2026-02-04 00:00 |
19:20:39.45 |
+51:52:21.5 |
HIP 95218 |
21.28 |
| 2026-02-04 12:00 |
19:21:05.71 |
+51:54:35.4 |
HIP 95218 |
16.86 |
| 2026-02-05 00:00 |
19:21:31.90 |
+51:56:50.4 |
HIP 95218 |
12.58 |
| 2026-02-05 12:00 |
19:21:58.02 |
+51:59:06.6 |
HIP 95218 |
8.63 |
| 2026-02-06 00:00 |
19:22:24.05 |
+52:01:23.9 |
HIP 95218 |
5.75 |
| 2026-02-06 12:00 |
19:22:50.01 |
+52:03:42.5 |
HIP 95218 |
5.83 |
| 2026-02-07 00:00 |
19:23:15.89 |
+52:06:02.1 |
HIP 95218 |
8.77 |
| 2026-02-07 12:00 |
19:23:41.69 |
+52:08:22.9 |
HIP 95218 |
12.73 |
| 2026-02-08 00:00 |
19:24:07.41 |
+52:10:44.9 |
HIP 95218 |
17.00 |
| 2026-02-08 12:00 |
19:24:33.05 |
+52:13:08.0 |
HIP 95506 |
14.16 |
| 2026-02-09 00:00 |
19:24:58.60 |
+52:15:32.2 |
HIP 95506 |
9.95 |
| 2026-02-09 12:00 |
19:25:24.07 |
+52:17:57.5 |
HIP 95506 |
6.28 |
| 2026-02-10 00:00 |
19:25:49.45 |
+52:20:24.0 |
HIP 95506 |
4.67 |
| 2026-02-10 12:00 |
19:26:14.75 |
+52:22:51.5 |
HIP 95506 |
6.76 |
| 2026-02-11 00:00 |
19:26:39.97 |
+52:25:20.2 |
HIP 95656 |
9.31 |
| 2026-02-11 12:00 |
19:27:05.09 |
+52:27:50.0 |
HIP 95656 |
9.17 |
| 2026-02-12 00:00 |
19:27:30.13 |
+52:30:20.9 |
HIP 95656 |
11.14 |
| 2026-02-12 12:00 |
19:27:55.08 |
+52:32:52.8 |
HIP 95656 |
14.35 |
| 2026-02-13 00:00 |
19:28:19.93 |
+52:35:25.9 |
HIP 95872 |
14.54 |
| 2026-02-13 12:00 |
19:28:44.70 |
+52:38:00.0 |
HIP 95872 |
11.25 |
| 2026-02-14 00:00 |
19:29:09.37 |
+52:40:35.2 |
HIP 95872 |
9.14 |
| 2026-02-14 12:00 |
19:29:33.95 |
+52:43:11.5 |
HIP 95872 |
9.08 |
| 2026-02-15 00:00 |
19:29:58.44 |
+52:45:48.8 |
HIP 95872 |
11.10 |
| 2026-02-15 12:00 |
19:30:22.83 |
+52:48:27.1 |
HIP 95872 |
14.34 |
| 2026-02-16 00:00 |
19:30:47.12 |
+52:51:06.5 |
HIP 96061 |
13.12 |
| 2026-02-16 12:00 |
19:31:11.32 |
+52:53:47.0 |
HIP 96061 |
8.60 |
| 2026-02-17 00:00 |
19:31:35.42 |
+52:56:28.4 |
HIP 96061 |
4.08 |
| 2026-02-17 12:00 |
19:31:59.41 |
+52:59:10.9 |
HIP 96066 |
0.28 |
| 2026-02-18 00:00 |
19:32:23.31 |
+53:01:54.4 |
HIP 96066 |
4.77 |
| 2026-02-18 12:00 |
19:32:47.11 |
+53:04:38.9 |
HIP 96066 |
9.27 |
| 2026-02-19 00:00 |
19:33:10.80 |
+53:07:24.4 |
HIP 96066 |
13.77 |
| 2026-02-19 12:00 |
19:33:34.39 |
+53:10:10.9 |
HIP 96066 |
18.27 |
| 2026-02-20 00:00 |
19:33:57.87 |
+53:12:58.4 |
HIP 96066 |
22.76 |
| 2026-02-20 12:00 |
19:34:21.25 |
+53:15:46.8 |
HIP 96359 |
19.96 |
| 2026-02-21 00:00 |
19:34:44.52 |
+53:18:36.3 |
HIP 96359 |
15.80 |
| 2026-02-21 12:00 |
19:35:07.69 |
+53:21:26.6 |
HIP 96359 |
11.86 |
| 2026-02-22 00:00 |
19:35:30.74 |
+53:24:17.9 |
HIP 96359 |
8.45 |
| 2026-02-22 12:00 |
19:35:53.69 |
+53:27:10.2 |
HIP 96359 |
6.46 |
| 2026-02-23 00:00 |
19:36:16.53 |
+53:30:03.3 |
HIP 96359 |
7.17 |
| 2026-02-23 12:00 |
19:36:39.25 |
+53:32:57.4 |
HIP 96359 |
10.02 |
| 2026-02-24 00:00 |
19:37:01.86 |
+53:35:52.4 |
HIP 96359 |
13.73 |