メタデータ
| 項目 |
値 |
| Designation |
P/2020 O3 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-01-27T20:38:44.139840Z |
| Orbit solution date (soln_date, UTC) |
2023-02-06T22:13:22Z |
| Obs used |
71 |
| NEO |
- |
| M1 |
12.400 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-07-28T12:07:34.118400Z |
| Discovery magnitude (MPC) |
21.08 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-08-19.0000000 |
| e |
0.10611991 |
| q (au) |
4.167207 |
| a (au) |
4.661931 |
| i (deg) |
8.442690 |
| Ω (om, deg) |
266.895744 |
| ω (w, deg) |
81.214576 |
| M (ma, deg) |
344.151234 |
等級
散乱 + 全体線形
$$
M_a = (15.241 + 2.001\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.241 |
| n |
2.001 |
| gf |
0.901 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
1.000 |
| 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) |
| 2026-07-29 00:00 |
11:26:19.45 |
-04:31:46.9 |
HIP 55727 |
18.61 |
| 2026-07-29 12:00 |
11:26:40.67 |
-04:33:32.4 |
HIP 55727 |
23.68 |
| 2026-07-30 00:00 |
11:27:01.97 |
-04:35:18.7 |
HIP 55727 |
28.96 |
| 2026-07-30 12:00 |
11:27:23.34 |
-04:37:05.6 |
HIP 56049 |
29.45 |
| 2026-07-31 00:00 |
11:27:44.78 |
-04:38:53.3 |
HIP 56049 |
25.28 |
| 2026-07-31 12:00 |
11:28:06.29 |
-04:40:41.7 |
HIP 56049 |
21.77 |
| 2026-08-01 00:00 |
11:28:27.87 |
-04:42:30.8 |
HIP 56049 |
19.31 |
| 2026-08-01 12:00 |
11:28:49.52 |
-04:44:20.5 |
HIP 56049 |
18.34 |
| 2026-08-02 00:00 |
11:29:11.23 |
-04:46:11.0 |
HIP 56049 |
19.11 |
| 2026-08-02 12:00 |
11:29:33.01 |
-04:48:02.1 |
HIP 56049 |
21.45 |
| 2026-08-03 00:00 |
11:29:54.86 |
-04:49:53.9 |
HIP 56049 |
24.93 |
| 2026-08-03 12:00 |
11:30:16.78 |
-04:51:46.4 |
HIP 56206 |
28.58 |
| 2026-08-04 00:00 |
11:30:38.76 |
-04:53:39.6 |
HIP 56206 |
24.23 |
| 2026-08-04 12:00 |
11:31:00.80 |
-04:55:33.5 |
HIP 56206 |
20.59 |
| 2026-08-05 00:00 |
11:31:22.91 |
-04:57:28.0 |
HIP 56206 |
18.10 |
| 2026-08-05 12:00 |
11:31:45.08 |
-04:59:23.2 |
HIP 56206 |
17.30 |
| 2026-08-06 00:00 |
11:32:07.32 |
-05:01:19.0 |
HIP 56206 |
18.42 |
| 2026-08-06 12:00 |
11:32:29.62 |
-05:03:15.5 |
HIP 56206 |
21.17 |
| 2026-08-07 00:00 |
11:32:51.98 |
-05:05:12.7 |
HIP 56206 |
25.04 |
| 2026-08-07 12:00 |
11:33:14.41 |
-05:07:10.5 |
HIP 56479 |
24.71 |
| 2026-08-08 00:00 |
11:33:36.89 |
-05:09:09.0 |
HIP 56479 |
20.77 |
| 2026-08-08 12:00 |
11:33:59.44 |
-05:11:08.1 |
HIP 56479 |
17.97 |
| 2026-08-09 00:00 |
11:34:22.05 |
-05:13:07.8 |
HIP 56479 |
16.89 |
| 2026-08-09 12:00 |
11:34:44.71 |
-05:15:08.2 |
HIP 56444 |
17.48 |
| 2026-08-10 00:00 |
11:35:07.44 |
-05:17:09.2 |
HIP 56444 |
18.46 |
| 2026-08-10 12:00 |
11:35:30.22 |
-05:19:10.8 |
HIP 56444 |
21.17 |
| 2026-08-11 00:00 |
11:35:53.06 |
-05:21:13.1 |
HIP 56444 |
25.07 |
| 2026-08-11 12:00 |
11:36:15.96 |
-05:23:16.0 |
HIP 56444 |
29.71 |
| 2026-08-12 00:00 |
11:36:38.92 |
-05:25:19.4 |
HIP 56444 |
34.80 |
| 2026-08-12 12:00 |
11:37:01.93 |
-05:27:23.5 |
HIP 56444 |
40.17 |
| 2026-08-13 00:00 |
11:37:24.99 |
-05:29:28.2 |
HIP 56580 |
41.46 |
| 2026-08-13 12:00 |
11:37:48.11 |
-05:31:33.5 |
HIP 56884 |
42.77 |
| 2026-08-14 00:00 |
11:38:11.29 |
-05:33:39.4 |
HIP 56884 |
41.02 |
| 2026-08-14 12:00 |
11:38:34.51 |
-05:35:45.9 |
HIP 56884 |
40.14 |
| 2026-08-15 00:00 |
11:38:57.79 |
-05:37:52.9 |
HIP 56982 |
38.40 |
| 2026-08-15 12:00 |
11:39:21.12 |
-05:40:00.6 |
HIP 56982 |
35.98 |
| 2026-08-16 00:00 |
11:39:44.51 |
-05:42:08.8 |
HIP 56982 |
34.52 |
| 2026-08-16 12:00 |
11:40:07.94 |
-05:44:17.6 |
HIP 56982 |
34.14 |
| 2026-08-17 00:00 |
11:40:31.42 |
-05:46:26.9 |
HIP 56982 |
34.89 |
| 2026-08-17 12:00 |
11:40:54.95 |
-05:48:36.8 |
HIP 56982 |
36.71 |
| 2026-08-18 00:00 |
11:41:18.53 |
-05:50:47.2 |
HIP 56982 |
39.45 |
| 2026-08-18 12:00 |
11:41:42.16 |
-05:52:58.2 |
HIP 57164 |
36.93 |
| 2026-08-19 00:00 |
11:42:05.83 |
-05:55:09.8 |
HIP 57164 |
34.89 |