メタデータ
| 項目 |
値 |
| Designation |
386P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-06-21T04:09:09.524160Z |
| Orbit solution date (soln_date, UTC) |
2021-05-31T22:43:09Z |
| Obs used |
118 |
| NEO |
- |
| M1 |
13.500 |
| K1 |
12.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-09-30.0000000 |
| e |
0.41776560 |
| q (au) |
2.359299 |
| a (au) |
4.052147 |
| i (deg) |
15.244307 |
| Ω (om, deg) |
134.979116 |
| ω (w, deg) |
353.350939 |
| M (ma, deg) |
144.492270 |
等級
散乱 + 全体線形
$$
M_a = (16.415 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.415 |
| n |
2.000 |
| gf |
0.990 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
9.998 |
| 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 |
23:48:58.94 |
-14:19:36.9 |
HIP 117518 |
14.05 |
| 2026-09-20 12:00 |
23:48:41.47 |
-14:22:04.3 |
HIP 117518 |
18.37 |
| 2026-09-21 00:00 |
23:48:23.99 |
-14:24:30.9 |
HIP 117518 |
22.92 |
| 2026-09-21 12:00 |
23:48:06.51 |
-14:26:56.4 |
HIP 117425 |
25.54 |
| 2026-09-22 00:00 |
23:47:49.03 |
-14:29:20.9 |
HIP 117425 |
24.83 |
| 2026-09-22 12:00 |
23:47:31.55 |
-14:31:44.4 |
HIP 117425 |
25.08 |
| 2026-09-23 00:00 |
23:47:14.07 |
-14:34:06.8 |
HIP 117202 |
22.70 |
| 2026-09-23 12:00 |
23:46:56.60 |
-14:36:28.2 |
HIP 117202 |
17.86 |
| 2026-09-24 00:00 |
23:46:39.13 |
-14:38:48.4 |
HIP 117202 |
13.03 |
| 2026-09-24 12:00 |
23:46:21.69 |
-14:41:07.6 |
HIP 117202 |
8.22 |
| 2026-09-25 00:00 |
23:46:04.26 |
-14:43:25.6 |
HIP 117202 |
3.42 |
| 2026-09-25 12:00 |
23:45:46.85 |
-14:45:42.4 |
HIP 117202 |
1.40 |
| 2026-09-26 00:00 |
23:45:29.46 |
-14:47:58.1 |
HIP 117202 |
6.16 |
| 2026-09-26 12:00 |
23:45:12.10 |
-14:50:12.6 |
HIP 117202 |
10.91 |
| 2026-09-27 00:00 |
23:44:54.76 |
-14:52:25.9 |
HIP 117202 |
15.65 |
| 2026-09-27 12:00 |
23:44:37.46 |
-14:54:37.9 |
HIP 117202 |
20.38 |
| 2026-09-28 00:00 |
23:44:20.20 |
-14:56:48.7 |
HIP 117054 |
21.57 |
| 2026-09-28 12:00 |
23:44:02.97 |
-14:58:58.3 |
HIP 117054 |
18.39 |
| 2026-09-29 00:00 |
23:43:45.79 |
-15:01:06.6 |
HIP 117054 |
15.98 |
| 2026-09-29 12:00 |
23:43:28.64 |
-15:03:13.5 |
HIP 117054 |
14.72 |
| 2026-09-30 00:00 |
23:43:11.55 |
-15:05:19.2 |
HIP 117054 |
14.88 |
| 2026-09-30 12:00 |
23:42:54.51 |
-15:07:23.5 |
HIP 117054 |
16.41 |
| 2026-10-01 00:00 |
23:42:37.52 |
-15:09:26.4 |
HIP 116957 |
17.59 |
| 2026-10-01 12:00 |
23:42:20.59 |
-15:11:28.0 |
HIP 116957 |
15.51 |
| 2026-10-02 00:00 |
23:42:03.71 |
-15:13:28.2 |
HIP 116922 |
14.39 |
| 2026-10-02 12:00 |
23:41:46.90 |
-15:15:27.0 |
HIP 116922 |
12.64 |
| 2026-10-03 00:00 |
23:41:30.16 |
-15:17:24.4 |
HIP 116922 |
12.39 |
| 2026-10-03 12:00 |
23:41:13.49 |
-15:19:20.3 |
HIP 116922 |
13.69 |
| 2026-10-04 00:00 |
23:40:56.88 |
-15:21:14.8 |
HIP 116792 |
11.12 |
| 2026-10-04 12:00 |
23:40:40.36 |
-15:23:07.8 |
HIP 116792 |
6.73 |
| 2026-10-05 00:00 |
23:40:23.91 |
-15:24:59.4 |
HIP 116792 |
2.43 |
| 2026-10-05 12:00 |
23:40:07.54 |
-15:26:49.4 |
HIP 116792 |
2.18 |
| 2026-10-06 00:00 |
23:39:51.26 |
-15:28:37.9 |
HIP 116792 |
6.40 |
| 2026-10-06 12:00 |
23:39:35.07 |
-15:30:24.9 |
HIP 116792 |
10.67 |
| 2026-10-07 00:00 |
23:39:18.97 |
-15:32:10.4 |
HIP 116792 |
14.92 |
| 2026-10-07 12:00 |
23:39:02.96 |
-15:33:54.3 |
HIP 116792 |
19.14 |
| 2026-10-08 00:00 |
23:38:47.05 |
-15:35:36.6 |
HIP 116792 |
23.33 |
| 2026-10-08 12:00 |
23:38:31.24 |
-15:37:17.3 |
HIP 116792 |
27.49 |
| 2026-10-09 00:00 |
23:38:15.54 |
-15:38:56.4 |
HIP 116590 |
27.58 |
| 2026-10-09 12:00 |
23:37:59.94 |
-15:40:33.9 |
HIP 116590 |
28.18 |
| 2026-10-10 00:00 |
23:37:44.45 |
-15:42:09.8 |
HIP 116590 |
29.32 |
| 2026-10-10 12:00 |
23:37:29.07 |
-15:43:44.0 |
HIP 116590 |
30.93 |
| 2026-10-11 00:00 |
23:37:13.81 |
-15:45:16.6 |
HIP 116590 |
32.92 |