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) |
| 2026-03-26 00:00 |
19:55:39.25 |
+56:53:23.7 |
HIP 98111 |
13.34 |
| 2026-03-26 12:00 |
19:55:53.24 |
+56:56:58.1 |
HIP 98111 |
16.14 |
| 2026-03-27 00:00 |
19:56:07.06 |
+57:00:32.8 |
HIP 97920 |
17.33 |
| 2026-03-27 12:00 |
19:56:20.71 |
+57:04:07.8 |
HIP 97920 |
19.06 |
| 2026-03-28 00:00 |
19:56:34.18 |
+57:07:43.2 |
HIP 97920 |
21.39 |
| 2026-03-28 12:00 |
19:56:47.47 |
+57:11:18.9 |
HIP 97920 |
24.15 |
| 2026-03-29 00:00 |
19:57:00.59 |
+57:14:54.8 |
HIP 97920 |
27.20 |
| 2026-03-29 12:00 |
19:57:13.53 |
+57:18:31.1 |
HIP 97920 |
30.45 |
| 2026-03-30 00:00 |
19:57:26.30 |
+57:22:07.6 |
HIP 98360 |
29.36 |
| 2026-03-30 12:00 |
19:57:38.88 |
+57:25:44.4 |
HIP 98360 |
25.37 |
| 2026-03-31 00:00 |
19:57:51.29 |
+57:29:21.5 |
HIP 98360 |
21.39 |
| 2026-03-31 12:00 |
19:58:03.51 |
+57:32:58.8 |
HIP 98360 |
17.42 |
| 2026-04-01 00:00 |
19:58:15.55 |
+57:36:36.3 |
HIP 98360 |
13.45 |
| 2026-04-01 12:00 |
19:58:27.41 |
+57:40:14.1 |
HIP 98360 |
9.50 |
| 2026-04-02 00:00 |
19:58:39.09 |
+57:43:52.0 |
HIP 98360 |
5.58 |
| 2026-04-02 12:00 |
19:58:50.58 |
+57:47:30.2 |
HIP 98360 |
1.81 |
| 2026-04-03 00:00 |
19:59:01.88 |
+57:51:08.6 |
HIP 98360 |
2.57 |
| 2026-04-03 12:00 |
19:59:13.00 |
+57:54:47.1 |
HIP 98360 |
6.40 |
| 2026-04-04 00:00 |
19:59:23.93 |
+57:58:25.9 |
HIP 98360 |
10.30 |
| 2026-04-04 12:00 |
19:59:34.67 |
+58:02:04.8 |
HIP 98360 |
14.21 |
| 2026-04-05 00:00 |
19:59:45.21 |
+58:05:43.8 |
HIP 98360 |
18.11 |
| 2026-04-05 12:00 |
19:59:55.57 |
+58:09:23.0 |
HIP 98360 |
22.01 |
| 2026-04-06 00:00 |
20:00:05.74 |
+58:13:02.4 |
HIP 98360 |
25.90 |
| 2026-04-06 12:00 |
20:00:15.71 |
+58:16:41.8 |
HIP 98360 |
29.79 |
| 2026-04-07 00:00 |
20:00:25.49 |
+58:20:21.4 |
HIP 98360 |
33.67 |
| 2026-04-07 12:00 |
20:00:35.07 |
+58:24:01.0 |
HIP 98360 |
37.54 |
| 2026-04-08 00:00 |
20:00:44.45 |
+58:27:40.8 |
HIP 98737 |
35.51 |
| 2026-04-08 12:00 |
20:00:53.64 |
+58:31:20.6 |
HIP 98737 |
31.81 |
| 2026-04-09 00:00 |
20:01:02.63 |
+58:35:00.5 |
HIP 98737 |
28.16 |
| 2026-04-09 12:00 |
20:01:11.42 |
+58:38:40.4 |
HIP 98737 |
24.59 |
| 2026-04-10 00:00 |
20:01:20.01 |
+58:42:20.4 |
HIP 98737 |
21.14 |
| 2026-04-10 12:00 |
20:01:28.39 |
+58:46:00.5 |
HIP 98737 |
17.87 |
| 2026-04-11 00:00 |
20:01:36.57 |
+58:49:40.5 |
HIP 98737 |
14.88 |
| 2026-04-11 12:00 |
20:01:44.55 |
+58:53:20.6 |
HIP 98737 |
12.40 |
| 2026-04-12 00:00 |
20:01:52.32 |
+58:57:00.6 |
HIP 98737 |
10.75 |
| 2026-04-12 12:00 |
20:01:59.88 |
+59:00:40.7 |
HIP 98737 |
10.34 |
| 2026-04-13 00:00 |
20:02:07.24 |
+59:04:20.7 |
HIP 98737 |
11.29 |
| 2026-04-13 12:00 |
20:02:14.38 |
+59:08:00.6 |
HIP 98737 |
13.32 |
| 2026-04-14 00:00 |
20:02:21.32 |
+59:11:40.5 |
HIP 98737 |
16.00 |
| 2026-04-14 12:00 |
20:02:28.04 |
+59:15:20.4 |
HIP 98737 |
19.07 |
| 2026-04-15 00:00 |
20:02:34.56 |
+59:19:00.1 |
HIP 98737 |
22.36 |
| 2026-04-15 12:00 |
20:02:40.85 |
+59:22:39.8 |
HIP 98737 |
25.78 |
| 2026-04-16 00:00 |
20:02:46.94 |
+59:26:19.4 |
HIP 98737 |
29.28 |