メタデータ
| 項目 |
値 |
| Designation |
C/2024 L5 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-03-10T09:34:19.024320Z |
| Orbit solution date (soln_date, UTC) |
2026-03-31T09:42:18Z |
| Obs used |
1200 |
| NEO |
- |
| M1 |
5.500 |
| K1 |
15.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2024-06-14T22:40:01.257600Z |
| Discovery magnitude (MPC) |
17.68 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) |
2025-04-22.0000000 |
| e |
1.03720529 |
| q (au) |
3.432407 |
| a (au) |
-92.255888 |
| i (deg) |
166.573108 |
| Ω (om, deg) |
139.176287 |
| ω (w, deg) |
290.514613 |
| M (ma, deg) |
0.047384 |
等級
散乱 + 全体線形
$$
M_a = (4.849 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.849 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.773 |
| k |
0.999 |
| 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 |
09:04:31.48 |
+15:34:45.2 |
HIP 44672 |
29.67 |
| 2026-03-26 12:00 |
09:04:01.81 |
+15:37:56.2 |
HIP 44672 |
34.36 |
| 2026-03-27 00:00 |
09:03:32.47 |
+15:41:05.2 |
HIP 44672 |
39.97 |
| 2026-03-27 12:00 |
09:03:03.44 |
+15:44:12.2 |
HIP 44295 |
38.03 |
| 2026-03-28 00:00 |
09:02:34.73 |
+15:47:17.3 |
HIP 44295 |
36.40 |
| 2026-03-28 12:00 |
09:02:06.34 |
+15:50:20.5 |
HIP 44295 |
36.30 |
| 2026-03-29 00:00 |
09:01:38.27 |
+15:53:21.7 |
HIP 44295 |
37.70 |
| 2026-03-29 12:00 |
09:01:10.53 |
+15:56:21.0 |
HIP 44295 |
40.39 |
| 2026-03-30 00:00 |
09:00:43.10 |
+15:59:18.4 |
HIP 44295 |
44.10 |
| 2026-03-30 12:00 |
09:00:16.00 |
+16:02:13.9 |
HIP 44141 |
39.67 |
| 2026-03-31 00:00 |
08:59:49.21 |
+16:05:07.5 |
HIP 44000 |
33.47 |
| 2026-03-31 12:00 |
08:59:22.75 |
+16:07:59.2 |
HIP 44000 |
26.60 |
| 2026-04-01 00:00 |
08:58:56.60 |
+16:10:49.0 |
HIP 44000 |
19.88 |
| 2026-04-01 12:00 |
08:58:30.78 |
+16:13:36.9 |
HIP 44000 |
13.43 |
| 2026-04-02 00:00 |
08:58:05.27 |
+16:16:23.1 |
HIP 44000 |
7.67 |
| 2026-04-02 12:00 |
08:57:40.08 |
+16:19:07.3 |
HIP 44000 |
5.25 |
| 2026-04-03 00:00 |
08:57:15.21 |
+16:21:49.8 |
HIP 43975 |
4.94 |
| 2026-04-03 12:00 |
08:56:50.65 |
+16:24:30.4 |
HIP 43975 |
10.10 |
| 2026-04-04 00:00 |
08:56:26.42 |
+16:27:09.2 |
HIP 43975 |
16.14 |
| 2026-04-04 12:00 |
08:56:02.49 |
+16:29:46.1 |
HIP 43751 |
20.58 |
| 2026-04-05 00:00 |
08:55:38.89 |
+16:32:21.3 |
HIP 43751 |
14.39 |
| 2026-04-05 12:00 |
08:55:15.60 |
+16:34:54.8 |
HIP 43751 |
8.33 |
| 2026-04-06 00:00 |
08:54:52.62 |
+16:37:26.4 |
HIP 43751 |
2.75 |
| 2026-04-06 12:00 |
08:54:29.96 |
+16:39:56.3 |
HIP 43751 |
4.29 |
| 2026-04-07 00:00 |
08:54:07.61 |
+16:42:24.4 |
HIP 43751 |
9.96 |
| 2026-04-07 12:00 |
08:53:45.57 |
+16:44:50.8 |
HIP 43751 |
15.71 |
| 2026-04-08 00:00 |
08:53:23.84 |
+16:47:15.5 |
HIP 43751 |
21.42 |
| 2026-04-08 12:00 |
08:53:02.42 |
+16:49:38.5 |
HIP 43751 |
27.05 |
| 2026-04-09 00:00 |
08:52:41.32 |
+16:51:59.7 |
HIP 43613 |
30.86 |
| 2026-04-09 12:00 |
08:52:20.52 |
+16:54:19.3 |
HIP 43412 |
26.74 |
| 2026-04-10 00:00 |
08:52:00.02 |
+16:56:37.2 |
HIP 43412 |
21.40 |
| 2026-04-10 12:00 |
08:51:39.84 |
+16:58:53.4 |
HIP 43412 |
16.19 |
| 2026-04-11 00:00 |
08:51:19.96 |
+17:01:07.9 |
HIP 43412 |
11.18 |
| 2026-04-11 12:00 |
08:51:00.38 |
+17:03:20.8 |
HIP 43412 |
6.63 |
| 2026-04-12 00:00 |
08:50:41.11 |
+17:05:32.1 |
HIP 43412 |
4.06 |
| 2026-04-12 12:00 |
08:50:22.14 |
+17:07:41.7 |
HIP 43412 |
6.36 |
| 2026-04-13 00:00 |
08:50:03.47 |
+17:09:49.8 |
HIP 43412 |
10.64 |
| 2026-04-13 12:00 |
08:49:45.10 |
+17:11:56.2 |
HIP 43412 |
15.26 |
| 2026-04-14 00:00 |
08:49:27.03 |
+17:14:01.0 |
HIP 43412 |
19.92 |
| 2026-04-14 12:00 |
08:49:09.26 |
+17:16:04.3 |
HIP 43206 |
16.83 |
| 2026-04-15 00:00 |
08:48:51.78 |
+17:18:06.0 |
HIP 43206 |
12.20 |
| 2026-04-15 12:00 |
08:48:34.60 |
+17:20:06.1 |
HIP 43206 |
7.63 |
| 2026-04-16 00:00 |
08:48:17.72 |
+17:22:04.7 |
HIP 43206 |
3.15 |