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) |
| 2026-03-26 00:00 |
19:21:33.88 |
-64:19:52.7 |
HIP 95123 |
28.13 |
| 2026-03-26 12:00 |
19:21:53.95 |
-64:21:31.1 |
HIP 95123 |
30.08 |
| 2026-03-27 00:00 |
19:22:13.70 |
-64:23:10.0 |
HIP 95123 |
32.14 |
| 2026-03-27 12:00 |
19:22:33.11 |
-64:24:49.4 |
HIP 95123 |
34.29 |
| 2026-03-28 00:00 |
19:22:52.20 |
-64:26:29.5 |
HIP 95123 |
36.51 |
| 2026-03-28 12:00 |
19:23:10.96 |
-64:28:10.0 |
HIP 95123 |
38.78 |
| 2026-03-29 00:00 |
19:23:29.40 |
-64:29:51.1 |
HIP 95123 |
41.09 |
| 2026-03-29 12:00 |
19:23:47.50 |
-64:31:32.7 |
HIP 95840 |
42.69 |
| 2026-03-30 00:00 |
19:24:05.26 |
-64:33:14.9 |
HIP 95840 |
40.18 |
| 2026-03-30 12:00 |
19:24:22.69 |
-64:34:57.6 |
HIP 95840 |
37.70 |
| 2026-03-31 00:00 |
19:24:39.79 |
-64:36:40.8 |
HIP 95840 |
35.27 |
| 2026-03-31 12:00 |
19:24:56.55 |
-64:38:24.5 |
HIP 95840 |
32.88 |
| 2026-04-01 00:00 |
19:25:12.97 |
-64:40:08.8 |
HIP 95840 |
30.53 |
| 2026-04-01 12:00 |
19:25:29.05 |
-64:41:53.5 |
HIP 95840 |
28.24 |
| 2026-04-02 00:00 |
19:25:44.78 |
-64:43:38.7 |
HIP 95840 |
26.01 |
| 2026-04-02 12:00 |
19:26:00.17 |
-64:45:24.5 |
HIP 95840 |
23.86 |
| 2026-04-03 00:00 |
19:26:15.22 |
-64:47:10.7 |
HIP 95840 |
21.80 |
| 2026-04-03 12:00 |
19:26:29.92 |
-64:48:57.4 |
HIP 95840 |
19.84 |
| 2026-04-04 00:00 |
19:26:44.27 |
-64:50:44.6 |
HIP 95840 |
18.03 |
| 2026-04-04 12:00 |
19:26:58.26 |
-64:52:32.2 |
HIP 95840 |
16.39 |
| 2026-04-05 00:00 |
19:27:11.91 |
-64:54:20.3 |
HIP 95840 |
14.98 |
| 2026-04-05 12:00 |
19:27:25.20 |
-64:56:08.9 |
HIP 95840 |
13.85 |
| 2026-04-06 00:00 |
19:27:38.13 |
-64:57:57.9 |
HIP 95840 |
13.08 |
| 2026-04-06 12:00 |
19:27:50.71 |
-64:59:47.3 |
HIP 95840 |
12.71 |
| 2026-04-07 00:00 |
19:28:02.92 |
-65:01:37.2 |
HIP 95840 |
12.77 |
| 2026-04-07 12:00 |
19:28:14.78 |
-65:03:27.5 |
HIP 95840 |
13.25 |
| 2026-04-08 00:00 |
19:28:26.27 |
-65:05:18.2 |
HIP 95840 |
14.10 |
| 2026-04-08 12:00 |
19:28:37.39 |
-65:07:09.3 |
HIP 95567 |
14.98 |
| 2026-04-09 00:00 |
19:28:48.15 |
-65:09:00.8 |
HIP 95567 |
15.62 |
| 2026-04-09 12:00 |
19:28:58.54 |
-65:10:52.7 |
HIP 95567 |
16.48 |
| 2026-04-10 00:00 |
19:29:08.55 |
-65:12:45.0 |
HIP 95567 |
17.52 |
| 2026-04-10 12:00 |
19:29:18.20 |
-65:14:37.6 |
HIP 95567 |
18.71 |
| 2026-04-11 00:00 |
19:29:27.47 |
-65:16:30.6 |
HIP 95567 |
20.02 |
| 2026-04-11 12:00 |
19:29:36.36 |
-65:18:23.9 |
HIP 95567 |
21.42 |
| 2026-04-12 00:00 |
19:29:44.87 |
-65:20:17.6 |
HIP 95778 |
22.23 |
| 2026-04-12 12:00 |
19:29:53.01 |
-65:22:11.6 |
HIP 95778 |
20.65 |
| 2026-04-13 00:00 |
19:30:00.76 |
-65:24:05.9 |
HIP 95778 |
19.15 |
| 2026-04-13 12:00 |
19:30:08.12 |
-65:26:00.6 |
HIP 95778 |
17.75 |
| 2026-04-14 00:00 |
19:30:15.10 |
-65:27:55.5 |
HIP 95778 |
16.45 |
| 2026-04-14 12:00 |
19:30:21.69 |
-65:29:50.7 |
HIP 95778 |
15.29 |
| 2026-04-15 00:00 |
19:30:27.90 |
-65:31:46.1 |
HIP 95778 |
14.29 |
| 2026-04-15 12:00 |
19:30:33.71 |
-65:33:41.8 |
HIP 95778 |
13.49 |
| 2026-04-16 00:00 |
19:30:39.13 |
-65:35:37.7 |
HIP 95778 |
12.91 |