C/2024 A2 (ATLAS)
メタデータ
| 項目 |
値 |
| Designation |
C/2024 A2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-04-28T21:48:07.764480Z |
| Orbit solution date (soln_date, UTC) |
2025-02-13T09:12:46Z |
| Obs used |
497 |
| NEO |
- |
| M1 |
14.600 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-01-15T08:03:10.915200Z |
| Discovery magnitude (MPC) |
18.04 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) |
2024-07-05.0000000 |
| e |
0.94184736 |
| q (au) |
1.881640 |
| a (au) |
32.356907 |
| i (deg) |
119.111392 |
| Ω (om, deg) |
78.167124 |
| ω (w, deg) |
295.581197 |
| M (ma, deg) |
0.359271 |
等級
散乱 + 全体線形
$$
M_a = (13.792 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.792 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.726 |
| k |
0.995 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
00:29:08.56 |
+52:33:24.0 |
HIP 2367 |
9.98 |
| 2026-02-03 12:00 |
00:29:17.42 |
+52:31:35.9 |
HIP 2367 |
8.36 |
| 2026-02-04 00:00 |
00:29:26.44 |
+52:29:49.6 |
HIP 2367 |
7.06 |
| 2026-02-04 12:00 |
00:29:35.61 |
+52:28:05.1 |
HIP 2367 |
6.27 |
| 2026-02-05 00:00 |
00:29:44.93 |
+52:26:22.4 |
HIP 2367 |
6.19 |
| 2026-02-05 12:00 |
00:29:54.39 |
+52:24:41.5 |
HIP 2325 |
6.78 |
| 2026-02-06 00:00 |
00:30:03.99 |
+52:23:02.4 |
HIP 2325 |
6.02 |
| 2026-02-06 12:00 |
00:30:13.74 |
+52:21:25.2 |
HIP 2325 |
6.05 |
| 2026-02-07 00:00 |
00:30:23.62 |
+52:19:49.7 |
HIP 2325 |
6.86 |
| 2026-02-07 12:00 |
00:30:33.65 |
+52:18:16.1 |
HIP 2325 |
8.21 |
| 2026-02-08 00:00 |
00:30:43.81 |
+52:16:44.2 |
HIP 2325 |
9.89 |
| 2026-02-08 12:00 |
00:30:54.11 |
+52:15:14.2 |
HIP 2325 |
11.75 |
| 2026-02-09 00:00 |
00:31:04.54 |
+52:13:45.9 |
HIP 2325 |
13.71 |
| 2026-02-09 12:00 |
00:31:15.10 |
+52:12:19.4 |
HIP 2325 |
15.73 |
| 2026-02-10 00:00 |
00:31:25.79 |
+52:10:54.7 |
HIP 2325 |
17.80 |
| 2026-02-10 12:00 |
00:31:36.61 |
+52:09:31.9 |
HIP 2325 |
19.89 |
| 2026-02-11 00:00 |
00:31:47.55 |
+52:08:10.7 |
HIP 2325 |
22.00 |
| 2026-02-11 12:00 |
00:31:58.62 |
+52:06:51.4 |
HIP 2557 |
23.66 |
| 2026-02-12 00:00 |
00:32:09.81 |
+52:05:33.9 |
HIP 2557 |
22.09 |
| 2026-02-12 12:00 |
00:32:21.13 |
+52:04:18.1 |
HIP 2557 |
20.65 |
| 2026-02-13 00:00 |
00:32:32.56 |
+52:03:04.1 |
HIP 2557 |
19.38 |
| 2026-02-13 12:00 |
00:32:44.11 |
+52:01:51.9 |
HIP 2557 |
18.30 |
| 2026-02-14 00:00 |
00:32:55.78 |
+52:00:41.5 |
HIP 2557 |
17.45 |
| 2026-02-14 12:00 |
00:33:07.57 |
+51:59:32.8 |
HIP 2557 |
16.88 |
| 2026-02-15 00:00 |
00:33:19.46 |
+51:58:25.8 |
HIP 2557 |
16.60 |
| 2026-02-15 12:00 |
00:33:31.47 |
+51:57:20.7 |
HIP 2557 |
16.63 |
| 2026-02-16 00:00 |
00:33:43.59 |
+51:56:17.2 |
HIP 2760 |
15.14 |
| 2026-02-16 12:00 |
00:33:55.82 |
+51:55:15.6 |
HIP 2760 |
13.00 |
| 2026-02-17 00:00 |
00:34:08.15 |
+51:54:15.6 |
HIP 2760 |
10.87 |
| 2026-02-17 12:00 |
00:34:20.59 |
+51:53:17.5 |
HIP 2760 |
8.73 |
| 2026-02-18 00:00 |
00:34:33.13 |
+51:52:21.0 |
HIP 2760 |
6.59 |
| 2026-02-18 12:00 |
00:34:45.77 |
+51:51:26.3 |
HIP 2760 |
4.46 |
| 2026-02-19 00:00 |
00:34:58.51 |
+51:50:33.3 |
HIP 2760 |
2.36 |
| 2026-02-19 12:00 |
00:35:11.35 |
+51:49:42.0 |
HIP 2760 |
0.71 |
| 2026-02-20 00:00 |
00:35:24.29 |
+51:48:52.5 |
HIP 2760 |
2.17 |
| 2026-02-20 12:00 |
00:35:37.32 |
+51:48:04.7 |
HIP 2760 |
4.28 |
| 2026-02-21 00:00 |
00:35:50.45 |
+51:47:18.5 |
HIP 2760 |
6.42 |
| 2026-02-21 12:00 |
00:36:03.66 |
+51:46:34.1 |
HIP 2760 |
8.58 |
| 2026-02-22 00:00 |
00:36:16.97 |
+51:45:51.4 |
HIP 2760 |
10.74 |
| 2026-02-22 12:00 |
00:36:30.37 |
+51:45:10.3 |
HIP 2760 |
12.92 |
| 2026-02-23 00:00 |
00:36:43.85 |
+51:44:31.0 |
HIP 2760 |
15.09 |
| 2026-02-23 12:00 |
00:36:57.42 |
+51:43:53.3 |
HIP 2760 |
17.28 |
| 2026-02-24 00:00 |
00:37:11.07 |
+51:43:17.3 |
HIP 2760 |
19.46 |