C/2020 H6 (ATLAS)
メタデータ
| 項目 |
値 |
| Designation |
C/2020 H6 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-10-01T01:15:36.267840Z |
| Orbit solution date (soln_date, UTC) |
2024-05-30T01:12:18Z |
| Obs used |
2087 |
| NEO |
- |
| M1 |
7.400 |
| K1 |
8.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-04-22T08:13:58.051200Z |
| Discovery magnitude (MPC) |
18.18 c |
| Discovery observatory (MPC) |
T05 · ATLAS-HKO, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-01-06.0000000 |
| e |
1.00057173 |
| q (au) |
4.702870 |
| a (au) |
-8225.630152 |
| i (deg) |
79.970760 |
| Ω (om, deg) |
213.708285 |
| ω (w, deg) |
20.344638 |
| M (ma, deg) |
0.000128 |
等級
散乱 + 全体線形
$$
M_a = (6.961 + 3.055\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.961 |
| n |
3.055 |
| gf |
0.999 |
| gb |
-0.515 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2020-04-22 |
2021-08-23 |
+6.7896 |
-4.410 |
| 2021-12-16 |
2023-03-02 |
-3.6427 |
+2.331 |
| 2023-03-02 |
2024-01-08 |
+10.1728 |
-8.400 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
22:38:22.39 |
+52:05:19.8 |
HIP 111762 |
16.77 |
| 2026-02-03 12:00 |
22:38:39.54 |
+52:04:38.1 |
HIP 111762 |
17.66 |
| 2026-02-04 00:00 |
22:38:56.72 |
+52:03:57.3 |
HIP 111929 |
18.14 |
| 2026-02-04 12:00 |
22:39:13.92 |
+52:03:17.6 |
HIP 111929 |
16.92 |
| 2026-02-05 00:00 |
22:39:31.14 |
+52:02:38.8 |
HIP 111929 |
16.05 |
| 2026-02-05 12:00 |
22:39:48.38 |
+52:02:01.0 |
HIP 111929 |
15.60 |
| 2026-02-06 00:00 |
22:40:05.64 |
+52:01:24.2 |
HIP 111929 |
15.59 |
| 2026-02-06 12:00 |
22:40:22.92 |
+52:00:48.5 |
HIP 111929 |
16.04 |
| 2026-02-07 00:00 |
22:40:40.22 |
+52:00:13.7 |
HIP 111988 |
15.12 |
| 2026-02-07 12:00 |
22:40:57.54 |
+51:59:39.9 |
HIP 111988 |
14.18 |
| 2026-02-08 00:00 |
22:41:14.88 |
+51:59:07.1 |
HIP 111988 |
13.74 |
| 2026-02-08 12:00 |
22:41:32.23 |
+51:58:35.3 |
HIP 111988 |
13.85 |
| 2026-02-09 00:00 |
22:41:49.60 |
+51:58:04.5 |
HIP 111988 |
14.50 |
| 2026-02-09 12:00 |
22:42:06.99 |
+51:57:34.6 |
HIP 111988 |
15.62 |
| 2026-02-10 00:00 |
22:42:24.39 |
+51:57:05.8 |
HIP 111988 |
17.12 |
| 2026-02-10 12:00 |
22:42:41.81 |
+51:56:37.9 |
HIP 111988 |
18.91 |
| 2026-02-11 00:00 |
22:42:59.24 |
+51:56:11.1 |
HIP 111988 |
20.92 |
| 2026-02-11 12:00 |
22:43:16.69 |
+51:55:45.2 |
HIP 111988 |
23.08 |
| 2026-02-12 00:00 |
22:43:34.15 |
+51:55:20.3 |
HIP 111988 |
25.37 |
| 2026-02-12 12:00 |
22:43:51.62 |
+51:54:56.4 |
HIP 112411 |
23.65 |
| 2026-02-13 00:00 |
22:44:09.10 |
+51:54:33.5 |
HIP 112411 |
21.54 |
| 2026-02-13 12:00 |
22:44:26.59 |
+51:54:11.5 |
HIP 112411 |
19.56 |
| 2026-02-14 00:00 |
22:44:44.09 |
+51:53:50.6 |
HIP 112411 |
17.77 |
| 2026-02-14 12:00 |
22:45:01.60 |
+51:53:30.6 |
HIP 112411 |
16.22 |
| 2026-02-15 00:00 |
22:45:19.12 |
+51:53:11.6 |
HIP 112411 |
14.99 |
| 2026-02-15 12:00 |
22:45:36.65 |
+51:52:53.5 |
HIP 112411 |
14.16 |
| 2026-02-16 00:00 |
22:45:54.18 |
+51:52:36.4 |
HIP 112411 |
13.81 |
| 2026-02-16 12:00 |
22:46:11.73 |
+51:52:20.3 |
HIP 112411 |
13.97 |
| 2026-02-17 00:00 |
22:46:29.27 |
+51:52:05.2 |
HIP 112411 |
14.63 |
| 2026-02-17 12:00 |
22:46:46.82 |
+51:51:51.0 |
HIP 112565 |
12.54 |
| 2026-02-18 00:00 |
22:47:04.38 |
+51:51:37.8 |
HIP 112565 |
10.54 |
| 2026-02-18 12:00 |
22:47:21.94 |
+51:51:25.6 |
HIP 112565 |
8.91 |
| 2026-02-19 00:00 |
22:47:39.50 |
+51:51:14.3 |
HIP 112565 |
7.88 |
| 2026-02-19 12:00 |
22:47:57.07 |
+51:51:04.0 |
HIP 112565 |
7.71 |
| 2026-02-20 00:00 |
22:48:14.63 |
+51:50:54.6 |
HIP 112565 |
8.44 |
| 2026-02-20 12:00 |
22:48:32.20 |
+51:50:46.2 |
HIP 112673 |
8.80 |
| 2026-02-21 00:00 |
22:48:49.77 |
+51:50:38.7 |
HIP 112673 |
7.87 |
| 2026-02-21 12:00 |
22:49:07.33 |
+51:50:32.1 |
HIP 112673 |
7.81 |
| 2026-02-22 00:00 |
22:49:24.90 |
+51:50:26.6 |
HIP 112673 |
8.62 |
| 2026-02-22 12:00 |
22:49:42.46 |
+51:50:21.9 |
HIP 112673 |
10.11 |
| 2026-02-23 00:00 |
22:50:00.02 |
+51:50:18.2 |
HIP 112673 |
12.02 |
| 2026-02-23 12:00 |
22:50:17.58 |
+51:50:15.4 |
HIP 112887 |
12.57 |
| 2026-02-24 00:00 |
22:50:35.13 |
+51:50:13.5 |
HIP 112887 |
9.86 |