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
$$
M_a = (9.230 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.230 |
| n |
6.000 |
| gf |
0.973 |
| gb |
-0.700 |
| k |
0.827 |
| 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) |
| 2026-05-12 00:00 |
11:30:01.22 |
-73:37:18.8 |
HIP 56096 |
14.80 |
| 2026-05-12 12:00 |
11:29:42.31 |
-73:35:35.5 |
HIP 56096 |
13.11 |
| 2026-05-13 00:00 |
11:29:23.66 |
-73:33:51.7 |
HIP 56096 |
11.58 |
| 2026-05-13 12:00 |
11:29:05.27 |
-73:32:07.4 |
HIP 56096 |
10.27 |
| 2026-05-14 00:00 |
11:28:47.14 |
-73:30:22.6 |
HIP 56096 |
9.28 |
| 2026-05-14 12:00 |
11:28:29.28 |
-73:28:37.4 |
HIP 56096 |
8.71 |
| 2026-05-15 00:00 |
11:28:11.68 |
-73:26:51.7 |
HIP 56096 |
8.64 |
| 2026-05-15 12:00 |
11:27:54.35 |
-73:25:05.6 |
HIP 56096 |
9.09 |
| 2026-05-16 00:00 |
11:27:37.27 |
-73:23:19.1 |
HIP 56096 |
9.98 |
| 2026-05-16 12:00 |
11:27:20.46 |
-73:21:32.2 |
HIP 56096 |
11.20 |
| 2026-05-17 00:00 |
11:27:03.92 |
-73:19:44.9 |
HIP 56096 |
12.66 |
| 2026-05-17 12:00 |
11:26:47.63 |
-73:17:57.2 |
HIP 56096 |
14.28 |
| 2026-05-18 00:00 |
11:26:31.61 |
-73:16:09.1 |
HIP 56096 |
16.01 |
| 2026-05-18 12:00 |
11:26:15.85 |
-73:14:20.7 |
HIP 56096 |
17.82 |
| 2026-05-19 00:00 |
11:26:00.35 |
-73:12:31.9 |
HIP 56096 |
19.69 |
| 2026-05-19 12:00 |
11:25:45.11 |
-73:10:42.9 |
HIP 56096 |
21.59 |
| 2026-05-20 00:00 |
11:25:30.13 |
-73:08:53.5 |
HIP 56096 |
23.52 |
| 2026-05-20 12:00 |
11:25:15.41 |
-73:07:03.7 |
HIP 56096 |
25.47 |
| 2026-05-21 00:00 |
11:25:00.95 |
-73:05:13.7 |
HIP 55332 |
23.92 |
| 2026-05-21 12:00 |
11:24:46.74 |
-73:03:23.5 |
HIP 55332 |
22.41 |
| 2026-05-22 00:00 |
11:24:32.80 |
-73:01:32.9 |
HIP 55332 |
21.01 |
| 2026-05-22 12:00 |
11:24:19.11 |
-72:59:42.1 |
HIP 55332 |
19.76 |
| 2026-05-23 00:00 |
11:24:05.68 |
-72:57:51.1 |
HIP 55332 |
18.67 |
| 2026-05-23 12:00 |
11:23:52.50 |
-72:55:59.9 |
HIP 55332 |
17.78 |
| 2026-05-24 00:00 |
11:23:39.58 |
-72:54:08.4 |
HIP 55332 |
17.12 |
| 2026-05-24 12:00 |
11:23:26.91 |
-72:52:16.7 |
HIP 55332 |
16.71 |
| 2026-05-25 00:00 |
11:23:14.49 |
-72:50:24.8 |
HIP 55332 |
16.56 |
| 2026-05-25 12:00 |
11:23:02.32 |
-72:48:32.8 |
HIP 55332 |
16.69 |
| 2026-05-26 00:00 |
11:22:50.41 |
-72:46:40.6 |
HIP 55332 |
17.09 |
| 2026-05-26 12:00 |
11:22:38.74 |
-72:44:48.2 |
HIP 55332 |
17.73 |
| 2026-05-27 00:00 |
11:22:27.32 |
-72:42:55.7 |
HIP 55332 |
18.59 |
| 2026-05-27 12:00 |
11:22:16.15 |
-72:41:03.0 |
HIP 55332 |
19.64 |
| 2026-05-28 00:00 |
11:22:05.23 |
-72:39:10.3 |
HIP 55332 |
20.84 |
| 2026-05-28 12:00 |
11:21:54.55 |
-72:37:17.4 |
HIP 55332 |
22.18 |
| 2026-05-29 00:00 |
11:21:44.11 |
-72:35:24.4 |
HIP 55657 |
22.88 |
| 2026-05-29 12:00 |
11:21:33.92 |
-72:33:31.3 |
HIP 55657 |
21.67 |
| 2026-05-30 00:00 |
11:21:23.97 |
-72:31:38.1 |
HIP 55657 |
20.58 |
| 2026-05-30 12:00 |
11:21:14.26 |
-72:29:44.9 |
HIP 55657 |
19.63 |
| 2026-05-31 00:00 |
11:21:04.79 |
-72:27:51.6 |
HIP 55657 |
18.83 |
| 2026-05-31 12:00 |
11:20:55.56 |
-72:25:58.2 |
HIP 55657 |
18.22 |
| 2026-06-01 00:00 |
11:20:46.57 |
-72:24:04.8 |
HIP 55657 |
17.79 |
| 2026-06-01 12:00 |
11:20:37.81 |
-72:22:11.4 |
HIP 55657 |
17.57 |
| 2026-06-02 00:00 |
11:20:29.29 |
-72:20:18.0 |
HIP 55657 |
17.57 |