メタデータ
| 項目 |
値 |
| Designation |
C/2020 H7 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-06-03T12:09:27.060480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:34:06Z |
| Obs used |
174 |
| NEO |
- |
| M1 |
11.200 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-04-29T10:09:34.848000Z |
| Discovery magnitude (MPC) |
20.60 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) |
2020-05-21.0000000 |
| e |
0.99942724 |
| q (au) |
4.420107 |
| a (au) |
7717.249417 |
| i (deg) |
135.922901 |
| Ω (om, deg) |
323.529129 |
| ω (w, deg) |
82.769160 |
| M (ma, deg) |
359.999980 |
等級
散乱 + 全体線形
$$
M_a = (11.094 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.094 |
| n |
6.000 |
| gf |
0.867 |
| gb |
-0.784 |
| k |
0.800 |
| δ90 |
9.781 |
| 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) |
| 2026-05-12 00:00 |
08:25:21.93 |
+06:55:56.5 |
HIP 41129 |
28.65 |
| 2026-05-12 12:00 |
08:25:22.85 |
+06:56:01.2 |
HIP 41129 |
28.89 |
| 2026-05-13 00:00 |
08:25:23.82 |
+06:56:05.6 |
HIP 41129 |
29.14 |
| 2026-05-13 12:00 |
08:25:24.85 |
+06:56:09.7 |
HIP 41430 |
29.16 |
| 2026-05-14 00:00 |
08:25:25.94 |
+06:56:13.5 |
HIP 41430 |
28.90 |
| 2026-05-14 12:00 |
08:25:27.09 |
+06:56:17.1 |
HIP 41430 |
28.64 |
| 2026-05-15 00:00 |
08:25:28.30 |
+06:56:20.4 |
HIP 41430 |
28.37 |
| 2026-05-15 12:00 |
08:25:29.56 |
+06:56:23.4 |
HIP 41430 |
28.08 |
| 2026-05-16 00:00 |
08:25:30.89 |
+06:56:26.1 |
HIP 41430 |
27.80 |
| 2026-05-16 12:00 |
08:25:32.27 |
+06:56:28.5 |
HIP 41430 |
27.50 |
| 2026-05-17 00:00 |
08:25:33.70 |
+06:56:30.6 |
HIP 41430 |
27.20 |
| 2026-05-17 12:00 |
08:25:35.19 |
+06:56:32.5 |
HIP 41430 |
26.89 |
| 2026-05-18 00:00 |
08:25:36.74 |
+06:56:34.0 |
HIP 41430 |
26.57 |
| 2026-05-18 12:00 |
08:25:38.35 |
+06:56:35.3 |
HIP 41430 |
26.25 |
| 2026-05-19 00:00 |
08:25:40.01 |
+06:56:36.3 |
HIP 41430 |
25.92 |
| 2026-05-19 12:00 |
08:25:41.73 |
+06:56:37.0 |
HIP 41430 |
25.59 |
| 2026-05-20 00:00 |
08:25:43.50 |
+06:56:37.4 |
HIP 41430 |
25.25 |
| 2026-05-20 12:00 |
08:25:45.32 |
+06:56:37.5 |
HIP 41430 |
24.91 |
| 2026-05-21 00:00 |
08:25:47.20 |
+06:56:37.4 |
HIP 41430 |
24.57 |
| 2026-05-21 12:00 |
08:25:49.13 |
+06:56:36.9 |
HIP 41430 |
24.22 |
| 2026-05-22 00:00 |
08:25:51.12 |
+06:56:36.2 |
HIP 41430 |
23.88 |
| 2026-05-22 12:00 |
08:25:53.16 |
+06:56:35.1 |
HIP 41430 |
23.53 |
| 2026-05-23 00:00 |
08:25:55.25 |
+06:56:33.8 |
HIP 41430 |
23.18 |
| 2026-05-23 12:00 |
08:25:57.39 |
+06:56:32.2 |
HIP 41430 |
22.84 |
| 2026-05-24 00:00 |
08:25:59.59 |
+06:56:30.3 |
HIP 41430 |
22.49 |
| 2026-05-24 12:00 |
08:26:01.83 |
+06:56:28.2 |
HIP 41430 |
22.15 |
| 2026-05-25 00:00 |
08:26:04.13 |
+06:56:25.7 |
HIP 41430 |
21.82 |
| 2026-05-25 12:00 |
08:26:06.48 |
+06:56:23.0 |
HIP 41430 |
21.49 |
| 2026-05-26 00:00 |
08:26:08.87 |
+06:56:19.9 |
HIP 41430 |
21.17 |
| 2026-05-26 12:00 |
08:26:11.32 |
+06:56:16.6 |
HIP 41430 |
20.85 |
| 2026-05-27 00:00 |
08:26:13.82 |
+06:56:13.0 |
HIP 41430 |
20.55 |
| 2026-05-27 12:00 |
08:26:16.37 |
+06:56:09.1 |
HIP 41430 |
20.26 |
| 2026-05-28 00:00 |
08:26:18.96 |
+06:56:04.9 |
HIP 41430 |
19.98 |
| 2026-05-28 12:00 |
08:26:21.61 |
+06:56:00.5 |
HIP 41430 |
19.72 |
| 2026-05-29 00:00 |
08:26:24.30 |
+06:55:55.7 |
HIP 41430 |
19.48 |
| 2026-05-29 12:00 |
08:26:27.04 |
+06:55:50.7 |
HIP 41430 |
19.25 |
| 2026-05-30 00:00 |
08:26:29.82 |
+06:55:45.4 |
HIP 41430 |
19.05 |
| 2026-05-30 12:00 |
08:26:32.66 |
+06:55:39.8 |
HIP 41430 |
18.87 |
| 2026-05-31 00:00 |
08:26:35.54 |
+06:55:33.9 |
HIP 41430 |
18.72 |
| 2026-05-31 12:00 |
08:26:38.47 |
+06:55:27.7 |
HIP 41430 |
18.59 |
| 2026-06-01 00:00 |
08:26:41.44 |
+06:55:21.3 |
HIP 41430 |
18.50 |
| 2026-06-01 12:00 |
08:26:44.46 |
+06:55:14.5 |
HIP 41430 |
18.44 |
| 2026-06-02 00:00 |
08:26:47.52 |
+06:55:07.5 |
HIP 41430 |
18.41 |