メタデータ
| 項目 |
値 |
| Designation |
C/2020 H4 (Leonard) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-08-29T06:41:40.873920Z |
| Orbit solution date (soln_date, UTC) |
2025-01-10T09:12:15Z |
| Obs used |
37 |
| NEO |
- |
| M1 |
16.600 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-04-21T11:20:52.512000Z |
| Discovery magnitude (MPC) |
19.50 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-04-30.0000000 |
| e |
0.99234750 |
| q (au) |
0.937676 |
| a (au) |
122.531978 |
| i (deg) |
84.325459 |
| Ω (om, deg) |
307.763404 |
| ω (w, deg) |
116.826499 |
| M (ma, deg) |
359.911872 |
等級
散乱 + 全体線形
$$
M_a = (12.688 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.688 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.988 |
| 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) |
| 2026-06-01 00:00 |
06:31:24.94 |
-67:00:41.6 |
HIP 31057 |
8.77 |
| 2026-06-01 12:00 |
06:31:40.09 |
-67:00:03.1 |
HIP 31057 |
8.69 |
| 2026-06-02 00:00 |
06:31:55.29 |
-66:59:25.2 |
HIP 31057 |
8.93 |
| 2026-06-02 12:00 |
06:32:10.54 |
-66:58:48.1 |
HIP 31057 |
9.45 |
| 2026-06-03 00:00 |
06:32:25.83 |
-66:58:11.6 |
HIP 31057 |
10.22 |
| 2026-06-03 12:00 |
06:32:41.17 |
-66:57:35.9 |
HIP 31057 |
11.17 |
| 2026-06-04 00:00 |
06:32:56.55 |
-66:57:00.9 |
HIP 31057 |
12.28 |
| 2026-06-04 12:00 |
06:33:11.98 |
-66:56:26.6 |
HIP 31057 |
13.50 |
| 2026-06-05 00:00 |
06:33:27.45 |
-66:55:53.1 |
HIP 31057 |
14.81 |
| 2026-06-05 12:00 |
06:33:42.97 |
-66:55:20.2 |
HIP 31057 |
16.18 |
| 2026-06-06 00:00 |
06:33:58.52 |
-66:54:48.1 |
HIP 31057 |
17.59 |
| 2026-06-06 12:00 |
06:34:14.12 |
-66:54:16.7 |
HIP 31057 |
19.05 |
| 2026-06-07 00:00 |
06:34:29.76 |
-66:53:46.0 |
HIP 31450 |
20.43 |
| 2026-06-07 12:00 |
06:34:45.44 |
-66:53:16.0 |
HIP 31450 |
20.60 |
| 2026-06-08 00:00 |
06:35:01.15 |
-66:52:46.8 |
HIP 31450 |
20.88 |
| 2026-06-08 12:00 |
06:35:16.91 |
-66:52:18.3 |
HIP 31450 |
21.27 |
| 2026-06-09 00:00 |
06:35:32.70 |
-66:51:50.5 |
HIP 31450 |
21.76 |
| 2026-06-09 12:00 |
06:35:48.53 |
-66:51:23.5 |
HIP 31450 |
22.34 |
| 2026-06-10 00:00 |
06:36:04.39 |
-66:50:57.2 |
HIP 31450 |
23.01 |
| 2026-06-10 12:00 |
06:36:20.29 |
-66:50:31.7 |
HIP 31450 |
23.76 |
| 2026-06-11 00:00 |
06:36:36.23 |
-66:50:06.8 |
HIP 31450 |
24.58 |
| 2026-06-11 12:00 |
06:36:52.20 |
-66:49:42.7 |
HIP 31450 |
25.46 |
| 2026-06-12 00:00 |
06:37:08.20 |
-66:49:19.4 |
HIP 31450 |
26.41 |
| 2026-06-12 12:00 |
06:37:24.23 |
-66:48:56.8 |
HIP 31450 |
27.40 |
| 2026-06-13 00:00 |
06:37:40.29 |
-66:48:35.0 |
HIP 31450 |
28.44 |
| 2026-06-13 12:00 |
06:37:56.38 |
-66:48:13.8 |
HIP 31450 |
29.53 |
| 2026-06-14 00:00 |
06:38:12.50 |
-66:47:53.5 |
HIP 31450 |
30.65 |
| 2026-06-14 12:00 |
06:38:28.65 |
-66:47:33.9 |
HIP 31450 |
31.81 |
| 2026-06-15 00:00 |
06:38:44.83 |
-66:47:15.0 |
HIP 32200 |
32.00 |
| 2026-06-15 12:00 |
06:39:01.03 |
-66:46:56.9 |
HIP 32200 |
30.49 |
| 2026-06-16 00:00 |
06:39:17.26 |
-66:46:39.6 |
HIP 32200 |
29.00 |
| 2026-06-16 12:00 |
06:39:33.51 |
-66:46:23.0 |
HIP 32200 |
27.53 |
| 2026-06-17 00:00 |
06:39:49.79 |
-66:46:07.1 |
HIP 32200 |
26.09 |
| 2026-06-17 12:00 |
06:40:06.09 |
-66:45:52.0 |
HIP 32200 |
24.67 |
| 2026-06-18 00:00 |
06:40:22.41 |
-66:45:37.7 |
HIP 32200 |
23.29 |
| 2026-06-18 12:00 |
06:40:38.75 |
-66:45:24.1 |
HIP 32200 |
21.96 |
| 2026-06-19 00:00 |
06:40:55.11 |
-66:45:11.3 |
HIP 32200 |
20.67 |
| 2026-06-19 12:00 |
06:41:11.49 |
-66:44:59.2 |
HIP 32200 |
19.44 |
| 2026-06-20 00:00 |
06:41:27.88 |
-66:44:47.9 |
HIP 32200 |
18.29 |
| 2026-06-20 12:00 |
06:41:44.30 |
-66:44:37.4 |
HIP 32200 |
17.23 |
| 2026-06-21 00:00 |
06:42:00.73 |
-66:44:27.6 |
HIP 32200 |
16.27 |
| 2026-06-21 12:00 |
06:42:17.18 |
-66:44:18.5 |
HIP 32200 |
15.44 |
| 2026-06-22 00:00 |
06:42:33.64 |
-66:44:10.3 |
HIP 32200 |
14.75 |