C/2020 H7 (Lemmon)
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) |
| 2026-02-03 00:00 |
08:42:41.80 |
+05:42:26.3 |
HIP 42804 |
27.81 |
| 2026-02-03 12:00 |
08:42:31.84 |
+05:42:50.3 |
HIP 42635 |
26.84 |
| 2026-02-04 00:00 |
08:42:21.90 |
+05:43:14.5 |
HIP 42635 |
25.55 |
| 2026-02-04 12:00 |
08:42:11.97 |
+05:43:38.9 |
HIP 42635 |
24.46 |
| 2026-02-05 00:00 |
08:42:02.05 |
+05:44:03.5 |
HIP 42635 |
23.59 |
| 2026-02-05 12:00 |
08:41:52.14 |
+05:44:28.3 |
HIP 42635 |
22.96 |
| 2026-02-06 00:00 |
08:41:42.26 |
+05:44:53.2 |
HIP 42635 |
22.60 |
| 2026-02-06 12:00 |
08:41:32.38 |
+05:45:18.3 |
HIP 42635 |
22.51 |
| 2026-02-07 00:00 |
08:41:22.53 |
+05:45:43.7 |
HIP 42635 |
22.71 |
| 2026-02-07 12:00 |
08:41:12.69 |
+05:46:09.1 |
HIP 42491 |
21.92 |
| 2026-02-08 00:00 |
08:41:02.87 |
+05:46:34.8 |
HIP 42491 |
19.47 |
| 2026-02-08 12:00 |
08:40:53.06 |
+05:47:00.6 |
HIP 42491 |
17.05 |
| 2026-02-09 00:00 |
08:40:43.28 |
+05:47:26.5 |
HIP 42491 |
14.65 |
| 2026-02-09 12:00 |
08:40:33.52 |
+05:47:52.7 |
HIP 42491 |
12.28 |
| 2026-02-10 00:00 |
08:40:23.78 |
+05:48:18.9 |
HIP 42491 |
9.96 |
| 2026-02-10 12:00 |
08:40:14.06 |
+05:48:45.4 |
HIP 42491 |
7.74 |
| 2026-02-11 00:00 |
08:40:04.36 |
+05:49:12.0 |
HIP 42491 |
5.72 |
| 2026-02-11 12:00 |
08:39:54.69 |
+05:49:38.7 |
HIP 42491 |
4.20 |
| 2026-02-12 00:00 |
08:39:45.04 |
+05:50:05.6 |
HIP 42491 |
3.82 |
| 2026-02-12 12:00 |
08:39:35.41 |
+05:50:32.6 |
HIP 42491 |
4.84 |
| 2026-02-13 00:00 |
08:39:25.82 |
+05:50:59.7 |
HIP 42491 |
6.64 |
| 2026-02-13 12:00 |
08:39:16.24 |
+05:51:27.0 |
HIP 42491 |
8.74 |
| 2026-02-14 00:00 |
08:39:06.70 |
+05:51:54.4 |
HIP 42491 |
10.98 |
| 2026-02-14 12:00 |
08:38:57.18 |
+05:52:21.9 |
HIP 42488 |
13.25 |
| 2026-02-15 00:00 |
08:38:47.70 |
+05:52:49.5 |
HIP 42488 |
15.55 |
| 2026-02-15 12:00 |
08:38:38.24 |
+05:53:17.3 |
HIP 42488 |
17.88 |
| 2026-02-16 00:00 |
08:38:28.81 |
+05:53:45.1 |
HIP 42313 |
16.85 |
| 2026-02-16 12:00 |
08:38:19.42 |
+05:54:13.1 |
HIP 42313 |
15.58 |
| 2026-02-17 00:00 |
08:38:10.05 |
+05:54:41.2 |
HIP 42283 |
14.10 |
| 2026-02-17 12:00 |
08:38:00.72 |
+05:55:09.4 |
HIP 42283 |
11.77 |
| 2026-02-18 00:00 |
08:37:51.43 |
+05:55:37.6 |
HIP 42283 |
9.45 |
| 2026-02-18 12:00 |
08:37:42.16 |
+05:56:06.0 |
HIP 42283 |
7.17 |
| 2026-02-19 00:00 |
08:37:32.94 |
+05:56:34.5 |
HIP 42283 |
4.97 |
| 2026-02-19 12:00 |
08:37:23.74 |
+05:57:03.0 |
HIP 42283 |
2.99 |
| 2026-02-20 00:00 |
08:37:14.59 |
+05:57:31.6 |
HIP 42283 |
2.02 |
| 2026-02-20 12:00 |
08:37:05.47 |
+05:58:00.3 |
HIP 42283 |
3.16 |
| 2026-02-21 00:00 |
08:36:56.39 |
+05:58:29.1 |
HIP 42283 |
5.15 |
| 2026-02-21 12:00 |
08:36:47.35 |
+05:58:57.9 |
HIP 42283 |
7.32 |
| 2026-02-22 00:00 |
08:36:38.34 |
+05:59:26.8 |
HIP 42283 |
9.54 |
| 2026-02-22 12:00 |
08:36:29.38 |
+05:59:55.8 |
HIP 42283 |
11.78 |
| 2026-02-23 00:00 |
08:36:20.46 |
+06:00:24.8 |
HIP 42283 |
14.02 |
| 2026-02-23 12:00 |
08:36:11.58 |
+06:00:53.9 |
HIP 42283 |
16.26 |
| 2026-02-24 00:00 |
08:36:02.74 |
+06:01:23.1 |
HIP 42283 |
18.49 |