Comet Archive

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C/2020 F5 (MASTER)

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

C/2020 F5 (MASTER) · Magnitude (Full range)

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)
2026-02-03 00:00 00:32:33.19 +51:59:18.2 HIP 2557 15.62
2026-02-03 12:00 00:32:42.40 +51:58:44.4 HIP 2557 15.17
2026-02-04 00:00 00:32:51.69 +51:58:11.4 HIP 2557 14.88
2026-02-04 12:00 00:33:01.05 +51:57:39.2 HIP 2557 14.76
2026-02-05 00:00 00:33:10.50 +51:57:07.8 HIP 2557 14.82
2026-02-05 12:00 00:33:20.02 +51:56:37.1 HIP 2557 15.06
2026-02-06 00:00 00:33:29.63 +51:56:07.2 HIP 2557 15.47
2026-02-06 12:00 00:33:39.31 +51:55:38.0 HIP 2760 15.51
2026-02-07 00:00 00:33:49.06 +51:55:09.7 HIP 2760 13.94
2026-02-07 12:00 00:33:58.89 +51:54:42.1 HIP 2760 12.36
2026-02-08 00:00 00:34:08.80 +51:54:15.3 HIP 2760 10.77
2026-02-08 12:00 00:34:18.78 +51:53:49.3 HIP 2760 9.18
2026-02-09 00:00 00:34:28.84 +51:53:24.1 HIP 2760 7.59
2026-02-09 12:00 00:34:38.97 +51:52:59.7 HIP 2760 6.00
2026-02-10 00:00 00:34:49.18 +51:52:36.0 HIP 2760 4.43
2026-02-10 12:00 00:34:59.45 +51:52:13.1 HIP 2760 2.92
2026-02-11 00:00 00:35:09.80 +51:51:51.1 HIP 2760 1.66
2026-02-11 12:00 00:35:20.22 +51:51:29.8 HIP 2760 1.55
2026-02-12 00:00 00:35:30.71 +51:51:09.3 HIP 2760 2.76
2026-02-12 12:00 00:35:41.26 +51:50:49.6 HIP 2760 4.28
2026-02-13 00:00 00:35:51.89 +51:50:30.7 HIP 2760 5.90
2026-02-13 12:00 00:36:02.59 +51:50:12.6 HIP 2760 7.55
2026-02-14 00:00 00:36:13.35 +51:49:55.3 HIP 2760 9.22
2026-02-14 12:00 00:36:24.18 +51:49:38.8 HIP 2760 10.90
2026-02-15 00:00 00:36:35.07 +51:49:23.1 HIP 2760 12.60
2026-02-15 12:00 00:36:46.04 +51:49:08.2 HIP 2760 14.31
2026-02-16 00:00 00:36:57.06 +51:48:54.1 HIP 2760 16.03
2026-02-16 12:00 00:37:08.15 +51:48:40.8 HIP 2760 17.76
2026-02-17 00:00 00:37:19.31 +51:48:28.3 HIP 2760 19.49
2026-02-17 12:00 00:37:30.52 +51:48:16.6 HIP 2760 21.24
2026-02-18 00:00 00:37:41.80 +51:48:05.7 HIP 3153 22.63
2026-02-18 12:00 00:37:53.14 +51:47:55.6 HIP 3153 20.96
2026-02-19 00:00 00:38:04.54 +51:47:46.3 HIP 3153 19.29
2026-02-19 12:00 00:38:16.00 +51:47:37.8 HIP 3153 17.63
2026-02-20 00:00 00:38:27.52 +51:47:30.1 HIP 3153 15.98
2026-02-20 12:00 00:38:39.10 +51:47:23.2 HIP 3153 14.34
2026-02-21 00:00 00:38:50.73 +51:47:17.1 HIP 3153 12.74
2026-02-21 12:00 00:39:02.42 +51:47:11.8 HIP 3153 11.17
2026-02-22 00:00 00:39:14.17 +51:47:07.4 HIP 3153 9.69
2026-02-22 12:00 00:39:25.97 +51:47:03.7 HIP 3153 8.31
2026-02-23 00:00 00:39:37.83 +51:47:00.8 HIP 3153 7.13
2026-02-23 12:00 00:39:49.74 +51:46:58.7 HIP 3153 6.24
2026-02-24 00:00 00:40:01.70 +51:46:57.4 HIP 3153 5.82