メタデータ
| 項目 |
値 |
| Designation |
C/2020 H8 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-06-04T04:42:35.982720Z |
| Orbit solution date (soln_date, UTC) |
2021-07-01T22:12:48Z |
| Obs used |
199 |
| NEO |
- |
| M1 |
11.100 |
| K1 |
9.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-04-30T13:50:29.990400Z |
| Discovery magnitude (MPC) |
20.79 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-06-24.0000000 |
| e |
0.99237509 |
| q (au) |
4.674530 |
| a (au) |
613.060227 |
| i (deg) |
99.646917 |
| Ω (om, deg) |
68.406554 |
| ω (w, deg) |
128.895525 |
| M (ma, deg) |
0.001286 |
等級
散乱 + 全体線形
$$
M_a = (9.171 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.171 |
| n |
6.000 |
| gf |
0.970 |
| gb |
-0.701 |
| k |
0.837 |
| δ90 |
9.999 |
| 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) |
| 2026-09-20 00:00 |
11:48:08.30 |
-68:44:17.5 |
HIP 57403 |
11.48 |
| 2026-09-20 12:00 |
11:48:23.03 |
-68:44:41.1 |
HIP 57577 |
12.59 |
| 2026-09-21 00:00 |
11:48:37.75 |
-68:45:05.4 |
HIP 57577 |
13.17 |
| 2026-09-21 12:00 |
11:48:52.47 |
-68:45:30.5 |
HIP 57577 |
13.88 |
| 2026-09-22 00:00 |
11:49:07.19 |
-68:45:56.3 |
HIP 57814 |
13.36 |
| 2026-09-22 12:00 |
11:49:21.90 |
-68:46:23.0 |
HIP 57814 |
11.97 |
| 2026-09-23 00:00 |
11:49:36.61 |
-68:46:50.4 |
HIP 57814 |
10.58 |
| 2026-09-23 12:00 |
11:49:51.30 |
-68:47:18.6 |
HIP 57814 |
9.18 |
| 2026-09-24 00:00 |
11:50:05.99 |
-68:47:47.6 |
HIP 57814 |
7.79 |
| 2026-09-24 12:00 |
11:50:20.67 |
-68:48:17.4 |
HIP 57814 |
6.39 |
| 2026-09-25 00:00 |
11:50:35.34 |
-68:48:47.9 |
HIP 57814 |
5.00 |
| 2026-09-25 12:00 |
11:50:50.00 |
-68:49:19.2 |
HIP 57814 |
3.63 |
| 2026-09-26 00:00 |
11:51:04.65 |
-68:49:51.2 |
HIP 57814 |
2.32 |
| 2026-09-26 12:00 |
11:51:19.29 |
-68:50:24.0 |
HIP 57814 |
1.26 |
| 2026-09-27 00:00 |
11:51:33.91 |
-68:50:57.6 |
HIP 57814 |
1.36 |
| 2026-09-27 12:00 |
11:51:48.53 |
-68:51:32.0 |
HIP 57814 |
2.50 |
| 2026-09-28 00:00 |
11:52:03.12 |
-68:52:07.1 |
HIP 57814 |
3.84 |
| 2026-09-28 12:00 |
11:52:17.71 |
-68:52:42.9 |
HIP 57814 |
5.23 |
| 2026-09-29 00:00 |
11:52:32.27 |
-68:53:19.5 |
HIP 57814 |
6.65 |
| 2026-09-29 12:00 |
11:52:46.82 |
-68:53:56.9 |
HIP 57814 |
8.07 |
| 2026-09-30 00:00 |
11:53:01.36 |
-68:54:35.0 |
HIP 57814 |
9.51 |
| 2026-09-30 12:00 |
11:53:15.87 |
-68:55:13.9 |
HIP 57814 |
10.95 |
| 2026-10-01 00:00 |
11:53:30.37 |
-68:55:53.5 |
HIP 57814 |
12.40 |
| 2026-10-01 12:00 |
11:53:44.85 |
-68:56:33.9 |
HIP 57814 |
13.86 |
| 2026-10-02 00:00 |
11:53:59.30 |
-68:57:15.0 |
HIP 57814 |
15.31 |
| 2026-10-02 12:00 |
11:54:13.74 |
-68:57:56.8 |
HIP 57814 |
16.77 |
| 2026-10-03 00:00 |
11:54:28.15 |
-68:58:39.4 |
HIP 57814 |
18.24 |
| 2026-10-03 12:00 |
11:54:42.54 |
-68:59:22.7 |
HIP 57814 |
19.71 |
| 2026-10-04 00:00 |
11:54:56.91 |
-69:00:06.8 |
HIP 57814 |
21.18 |
| 2026-10-04 12:00 |
11:55:11.25 |
-69:00:51.6 |
HIP 57814 |
22.65 |
| 2026-10-05 00:00 |
11:55:25.57 |
-69:01:37.2 |
HIP 57814 |
24.13 |
| 2026-10-05 12:00 |
11:55:39.86 |
-69:02:23.4 |
HIP 57814 |
25.61 |
| 2026-10-06 00:00 |
11:55:54.12 |
-69:03:10.4 |
HIP 57814 |
27.10 |
| 2026-10-06 12:00 |
11:56:08.36 |
-69:03:58.2 |
HIP 57814 |
28.59 |
| 2026-10-07 00:00 |
11:56:22.56 |
-69:04:46.6 |
HIP 58662 |
29.53 |
| 2026-10-07 12:00 |
11:56:36.74 |
-69:05:35.8 |
HIP 58662 |
28.10 |
| 2026-10-08 00:00 |
11:56:50.88 |
-69:06:25.7 |
HIP 58662 |
26.69 |
| 2026-10-08 12:00 |
11:57:04.99 |
-69:07:16.3 |
HIP 58662 |
25.29 |
| 2026-10-09 00:00 |
11:57:19.07 |
-69:08:07.7 |
HIP 58662 |
23.90 |
| 2026-10-09 12:00 |
11:57:33.12 |
-69:08:59.7 |
HIP 58662 |
22.53 |
| 2026-10-10 00:00 |
11:57:47.13 |
-69:09:52.5 |
HIP 58662 |
21.19 |
| 2026-10-10 12:00 |
11:58:01.10 |
-69:10:46.0 |
HIP 58662 |
19.88 |
| 2026-10-11 00:00 |
11:58:15.03 |
-69:11:40.1 |
HIP 58662 |
18.61 |