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) |
| 2026-07-29 00:00 |
11:24:44.19 |
-69:19:38.0 |
HIP 55688 |
0.60 |
| 2026-07-29 12:00 |
11:24:54.34 |
-69:18:35.9 |
HIP 55688 |
1.78 |
| 2026-07-30 00:00 |
11:25:04.57 |
-69:17:34.6 |
HIP 55688 |
3.12 |
| 2026-07-30 12:00 |
11:25:14.90 |
-69:16:34.1 |
HIP 55688 |
4.47 |
| 2026-07-31 00:00 |
11:25:25.32 |
-69:15:34.3 |
HIP 55688 |
5.83 |
| 2026-07-31 12:00 |
11:25:35.82 |
-69:14:35.3 |
HIP 55688 |
7.18 |
| 2026-08-01 00:00 |
11:25:46.42 |
-69:13:37.0 |
HIP 55688 |
8.53 |
| 2026-08-01 12:00 |
11:25:57.10 |
-69:12:39.5 |
HIP 55688 |
9.88 |
| 2026-08-02 00:00 |
11:26:07.86 |
-69:11:42.7 |
HIP 55688 |
11.22 |
| 2026-08-02 12:00 |
11:26:18.71 |
-69:10:46.7 |
HIP 55688 |
12.56 |
| 2026-08-03 00:00 |
11:26:29.65 |
-69:09:51.4 |
HIP 55688 |
13.90 |
| 2026-08-03 12:00 |
11:26:40.66 |
-69:08:57.0 |
HIP 55688 |
15.24 |
| 2026-08-04 00:00 |
11:26:51.76 |
-69:08:03.3 |
HIP 55688 |
16.57 |
| 2026-08-04 12:00 |
11:27:02.94 |
-69:07:10.4 |
HIP 55688 |
17.90 |
| 2026-08-05 00:00 |
11:27:14.20 |
-69:06:18.2 |
HIP 55688 |
19.23 |
| 2026-08-05 12:00 |
11:27:25.54 |
-69:05:26.8 |
HIP 55688 |
20.55 |
| 2026-08-06 00:00 |
11:27:36.96 |
-69:04:36.3 |
HIP 55688 |
21.87 |
| 2026-08-06 12:00 |
11:27:48.45 |
-69:03:46.4 |
HIP 55688 |
23.18 |
| 2026-08-07 00:00 |
11:28:00.03 |
-69:02:57.4 |
HIP 55688 |
24.50 |
| 2026-08-07 12:00 |
11:28:11.67 |
-69:02:09.2 |
HIP 55688 |
25.81 |
| 2026-08-08 00:00 |
11:28:23.40 |
-69:01:21.7 |
HIP 55847 |
26.48 |
| 2026-08-08 12:00 |
11:28:35.19 |
-69:00:35.1 |
HIP 55847 |
26.13 |
| 2026-08-09 00:00 |
11:28:47.06 |
-68:59:49.2 |
HIP 55847 |
25.86 |
| 2026-08-09 12:00 |
11:28:59.00 |
-68:59:04.2 |
HIP 55847 |
25.67 |
| 2026-08-10 00:00 |
11:29:11.01 |
-68:58:19.9 |
HIP 55847 |
25.56 |
| 2026-08-10 12:00 |
11:29:23.09 |
-68:57:36.5 |
HIP 55847 |
25.54 |
| 2026-08-11 00:00 |
11:29:35.25 |
-68:56:53.8 |
HIP 55847 |
25.59 |
| 2026-08-11 12:00 |
11:29:47.46 |
-68:56:12.0 |
HIP 55847 |
25.73 |
| 2026-08-12 00:00 |
11:29:59.75 |
-68:55:31.0 |
HIP 55847 |
25.95 |
| 2026-08-12 12:00 |
11:30:12.10 |
-68:54:50.7 |
HIP 55847 |
26.25 |
| 2026-08-13 00:00 |
11:30:24.52 |
-68:54:11.3 |
HIP 55847 |
26.62 |
| 2026-08-13 12:00 |
11:30:37.00 |
-68:53:32.7 |
HIP 55847 |
27.06 |
| 2026-08-14 00:00 |
11:30:49.54 |
-68:52:54.9 |
HIP 56462 |
26.63 |
| 2026-08-14 12:00 |
11:31:02.14 |
-68:52:18.0 |
HIP 56462 |
25.37 |
| 2026-08-15 00:00 |
11:31:14.81 |
-68:51:41.8 |
HIP 56462 |
24.10 |
| 2026-08-15 12:00 |
11:31:27.53 |
-68:51:06.5 |
HIP 56462 |
22.85 |
| 2026-08-16 00:00 |
11:31:40.31 |
-68:50:32.0 |
HIP 56462 |
21.61 |
| 2026-08-16 12:00 |
11:31:53.15 |
-68:49:58.3 |
HIP 56462 |
20.37 |
| 2026-08-17 00:00 |
11:32:06.05 |
-68:49:25.4 |
HIP 56462 |
19.15 |
| 2026-08-17 12:00 |
11:32:19.00 |
-68:48:53.4 |
HIP 56462 |
17.95 |
| 2026-08-18 00:00 |
11:32:32.01 |
-68:48:22.1 |
HIP 56462 |
16.76 |
| 2026-08-18 12:00 |
11:32:45.07 |
-68:47:51.7 |
HIP 56462 |
15.60 |
| 2026-08-19 00:00 |
11:32:58.18 |
-68:47:22.1 |
HIP 56462 |
14.47 |