C/2024 G5 (Leonard)
メタデータ
| 項目 |
値 |
| Designation |
C/2024 G5 (Leonard) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-09-06T23:37:33.974400Z |
| Orbit solution date (soln_date, UTC) |
2024-05-07T20:12:02Z |
| Obs used |
92 |
| NEO |
- |
| M1 |
10.700 |
| K1 |
14.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-04-05T03:09:00.950400Z |
| Discovery magnitude (MPC) |
20.83 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2024-03-23.0000000 |
| e |
0.99442966 |
| q (au) |
2.952917 |
| a (au) |
530.114505 |
| i (deg) |
50.390198 |
| Ω (om, deg) |
316.398824 |
| ω (w, deg) |
209.557081 |
| M (ma, deg) |
359.986435 |
等級
散乱 + 全体線形
$$
M_a = (9.344 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.344 |
| n |
6.000 |
| gf |
0.994 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.987 |
| 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 |
18:23:32.72 |
-62:24:16.4 |
HIP 90202 |
7.52 |
| 2026-02-03 12:00 |
18:24:18.34 |
-62:24:58.3 |
HIP 90202 |
5.83 |
| 2026-02-04 00:00 |
18:25:03.78 |
-62:25:40.6 |
HIP 90278 |
4.56 |
| 2026-02-04 12:00 |
18:25:49.02 |
-62:26:23.2 |
HIP 90278 |
5.54 |
| 2026-02-05 00:00 |
18:26:34.08 |
-62:27:06.3 |
HIP 90278 |
9.79 |
| 2026-02-05 12:00 |
18:27:18.94 |
-62:27:49.8 |
HIP 90278 |
14.68 |
| 2026-02-06 00:00 |
18:28:03.62 |
-62:28:33.7 |
HIP 90278 |
19.72 |
| 2026-02-06 12:00 |
18:28:48.10 |
-62:29:17.9 |
HIP 90797 |
21.88 |
| 2026-02-07 00:00 |
18:29:32.39 |
-62:30:02.6 |
HIP 90797 |
18.46 |
| 2026-02-07 12:00 |
18:30:16.48 |
-62:30:47.7 |
HIP 90797 |
16.04 |
| 2026-02-08 00:00 |
18:31:00.38 |
-62:31:33.3 |
HIP 90797 |
15.08 |
| 2026-02-08 12:00 |
18:31:44.08 |
-62:32:19.2 |
HIP 90797 |
15.83 |
| 2026-02-09 00:00 |
18:32:27.59 |
-62:33:05.6 |
HIP 91024 |
16.23 |
| 2026-02-09 12:00 |
18:33:10.89 |
-62:33:52.5 |
HIP 91024 |
12.54 |
| 2026-02-10 00:00 |
18:33:54.00 |
-62:34:39.8 |
HIP 91024 |
10.07 |
| 2026-02-10 12:00 |
18:34:36.90 |
-62:35:27.5 |
HIP 91024 |
9.79 |
| 2026-02-11 00:00 |
18:35:19.60 |
-62:36:15.7 |
HIP 91024 |
11.80 |
| 2026-02-11 12:00 |
18:36:02.10 |
-62:37:04.3 |
HIP 91024 |
15.21 |
| 2026-02-12 00:00 |
18:36:44.39 |
-62:37:53.5 |
HIP 91024 |
19.26 |
| 2026-02-12 12:00 |
18:37:26.48 |
-62:38:43.1 |
HIP 91024 |
23.62 |
| 2026-02-13 00:00 |
18:38:08.35 |
-62:39:33.1 |
HIP 91683 |
26.16 |
| 2026-02-13 12:00 |
18:38:50.02 |
-62:40:23.7 |
HIP 91683 |
21.33 |
| 2026-02-14 00:00 |
18:39:31.48 |
-62:41:14.7 |
HIP 91683 |
16.54 |
| 2026-02-14 12:00 |
18:40:12.72 |
-62:42:06.3 |
HIP 91683 |
11.80 |
| 2026-02-15 00:00 |
18:40:53.75 |
-62:42:58.3 |
HIP 91683 |
7.18 |
| 2026-02-15 12:00 |
18:41:34.57 |
-62:43:50.8 |
HIP 91683 |
3.07 |
| 2026-02-16 00:00 |
18:42:15.17 |
-62:44:43.8 |
HIP 91683 |
3.51 |
| 2026-02-16 12:00 |
18:42:55.56 |
-62:45:37.4 |
HIP 91683 |
7.72 |
| 2026-02-17 00:00 |
18:43:35.72 |
-62:46:31.4 |
HIP 91683 |
12.27 |
| 2026-02-17 12:00 |
18:44:15.67 |
-62:47:26.0 |
HIP 91683 |
16.86 |
| 2026-02-18 00:00 |
18:44:55.40 |
-62:48:21.0 |
HIP 92172 |
15.88 |
| 2026-02-18 12:00 |
18:45:34.90 |
-62:49:16.7 |
HIP 92172 |
11.99 |
| 2026-02-19 00:00 |
18:46:14.18 |
-62:50:12.8 |
HIP 92172 |
8.84 |
| 2026-02-19 12:00 |
18:46:53.23 |
-62:51:09.4 |
HIP 92172 |
7.42 |
| 2026-02-20 00:00 |
18:47:32.06 |
-62:52:06.6 |
HIP 92230 |
6.35 |
| 2026-02-20 12:00 |
18:48:10.66 |
-62:53:04.4 |
HIP 92230 |
5.83 |
| 2026-02-21 00:00 |
18:48:49.03 |
-62:54:02.6 |
HIP 92230 |
8.23 |
| 2026-02-21 12:00 |
18:49:27.17 |
-62:55:01.4 |
HIP 92230 |
11.86 |
| 2026-02-22 00:00 |
18:50:05.07 |
-62:56:00.8 |
HIP 92230 |
15.88 |
| 2026-02-22 12:00 |
18:50:42.75 |
-62:57:00.7 |
HIP 92545 |
19.03 |
| 2026-02-23 00:00 |
18:51:20.19 |
-62:58:01.2 |
HIP 92545 |
19.24 |
| 2026-02-23 12:00 |
18:51:57.40 |
-62:59:02.2 |
HIP 92545 |
20.43 |
| 2026-02-24 00:00 |
18:52:34.37 |
-63:00:03.7 |
HIP 92545 |
22.42 |