メタデータ
| 項目 |
値 |
| Designation |
C/2020 F5 (MASTER) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-03-22T10:15:53.521920Z |
| Orbit solution date (soln_date, UTC) |
2024-10-31T13:12:14Z |
| Obs used |
1861 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
7.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-03-27.0000000 |
| e |
0.99509246 |
| q (au) |
4.324799 |
| a (au) |
881.256429 |
| i (deg) |
52.256923 |
| Ω (om, deg) |
350.527461 |
| ω (w, deg) |
310.997698 |
| M (ma, deg) |
0.013924 |
等級
散乱 + 全体線形
$$
M_a = (5.786 + 3.334\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.786 |
| n |
3.334 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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 |
01:22:23.86 |
+55:12:43.0 |
HIP 6285 |
21.39 |
| 2026-06-01 12:00 |
01:22:34.20 |
+55:14:33.3 |
HIP 6473 |
22.27 |
| 2026-06-02 00:00 |
01:22:44.47 |
+55:16:23.7 |
HIP 6473 |
20.13 |
| 2026-06-02 12:00 |
01:22:54.67 |
+55:18:14.4 |
HIP 6473 |
18.04 |
| 2026-06-03 00:00 |
01:23:04.81 |
+55:20:05.4 |
HIP 6473 |
16.02 |
| 2026-06-03 12:00 |
01:23:14.88 |
+55:21:56.6 |
HIP 6473 |
14.10 |
| 2026-06-04 00:00 |
01:23:24.87 |
+55:23:48.0 |
HIP 6473 |
12.31 |
| 2026-06-04 12:00 |
01:23:34.80 |
+55:25:39.6 |
HIP 6473 |
10.73 |
| 2026-06-05 00:00 |
01:23:44.65 |
+55:27:31.5 |
HIP 6473 |
9.46 |
| 2026-06-05 12:00 |
01:23:54.44 |
+55:29:23.6 |
HIP 6473 |
8.63 |
| 2026-06-06 00:00 |
01:24:04.15 |
+55:31:16.0 |
HIP 6473 |
8.37 |
| 2026-06-06 12:00 |
01:24:13.79 |
+55:33:08.5 |
HIP 6473 |
8.73 |
| 2026-06-07 00:00 |
01:24:23.35 |
+55:35:01.2 |
HIP 6473 |
9.64 |
| 2026-06-07 12:00 |
01:24:32.84 |
+55:36:54.2 |
HIP 6473 |
10.96 |
| 2026-06-08 00:00 |
01:24:42.25 |
+55:38:47.4 |
HIP 6473 |
12.55 |
| 2026-06-08 12:00 |
01:24:51.59 |
+55:40:40.7 |
HIP 6473 |
14.33 |
| 2026-06-09 00:00 |
01:25:00.85 |
+55:42:34.3 |
HIP 6473 |
16.24 |
| 2026-06-09 12:00 |
01:25:10.04 |
+55:44:28.1 |
HIP 6681 |
14.66 |
| 2026-06-10 00:00 |
01:25:19.15 |
+55:46:22.0 |
HIP 6681 |
12.48 |
| 2026-06-10 12:00 |
01:25:28.18 |
+55:48:16.1 |
HIP 6681 |
10.35 |
| 2026-06-11 00:00 |
01:25:37.13 |
+55:50:10.4 |
HIP 6681 |
8.30 |
| 2026-06-11 12:00 |
01:25:46.00 |
+55:52:04.9 |
HIP 6681 |
6.41 |
| 2026-06-12 00:00 |
01:25:54.79 |
+55:53:59.6 |
HIP 6681 |
4.85 |
| 2026-06-12 12:00 |
01:26:03.50 |
+55:55:54.4 |
HIP 6681 |
4.02 |
| 2026-06-13 00:00 |
01:26:12.13 |
+55:57:49.4 |
HIP 6681 |
4.35 |
| 2026-06-13 12:00 |
01:26:20.67 |
+55:59:44.5 |
HIP 6681 |
5.65 |
| 2026-06-14 00:00 |
01:26:29.13 |
+56:01:39.8 |
HIP 6681 |
7.41 |
| 2026-06-14 12:00 |
01:26:37.51 |
+56:03:35.2 |
HIP 6681 |
9.38 |
| 2026-06-15 00:00 |
01:26:45.80 |
+56:05:30.8 |
HIP 6681 |
11.44 |
| 2026-06-15 12:00 |
01:26:54.01 |
+56:07:26.5 |
HIP 6681 |
13.55 |
| 2026-06-16 00:00 |
01:27:02.13 |
+56:09:22.4 |
HIP 6681 |
15.69 |
| 2026-06-16 12:00 |
01:27:10.17 |
+56:11:18.3 |
HIP 6681 |
17.85 |
| 2026-06-17 00:00 |
01:27:18.12 |
+56:13:14.4 |
HIP 6923 |
18.18 |
| 2026-06-17 12:00 |
01:27:25.98 |
+56:15:10.6 |
HIP 6923 |
18.32 |
| 2026-06-18 00:00 |
01:27:33.75 |
+56:17:06.9 |
HIP 6923 |
18.74 |
| 2026-06-18 12:00 |
01:27:41.43 |
+56:19:03.4 |
HIP 6923 |
19.42 |
| 2026-06-19 00:00 |
01:27:49.03 |
+56:20:59.9 |
HIP 6923 |
20.32 |
| 2026-06-19 12:00 |
01:27:56.53 |
+56:22:56.5 |
HIP 6863 |
19.22 |
| 2026-06-20 00:00 |
01:28:03.95 |
+56:24:53.2 |
HIP 6863 |
17.15 |
| 2026-06-20 12:00 |
01:28:11.27 |
+56:26:50.0 |
HIP 6863 |
15.11 |
| 2026-06-21 00:00 |
01:28:18.50 |
+56:28:46.8 |
HIP 6863 |
13.12 |
| 2026-06-21 12:00 |
01:28:25.64 |
+56:30:43.8 |
HIP 6863 |
11.21 |
| 2026-06-22 00:00 |
01:28:32.68 |
+56:32:40.8 |
HIP 6863 |
9.41 |