P/2012 U2 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
P/2012 U2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-12-04T06:27:38.750400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:26Z |
| Obs used |
36 |
| NEO |
- |
| M1 |
12.100 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-11-14.0000000 |
| e |
0.50656873 |
| q (au) |
3.627785 |
| a (au) |
7.352159 |
| i (deg) |
10.534475 |
| Ω (om, deg) |
186.863069 |
| ω (w, deg) |
229.534876 |
| M (ma, deg) |
358.997883 |
等級
散乱 + 全体線形
$$
M_a = (9.078 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.078 |
| n |
6.000 |
| gf |
0.801 |
| gb |
-0.500 |
| k |
0.973 |
| 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) |
| 2026-02-03 00:00 |
17:47:12.35 |
-13:34:37.2 |
HIP 86938 |
25.16 |
| 2026-02-03 12:00 |
17:47:23.74 |
-13:34:17.9 |
HIP 86938 |
27.14 |
| 2026-02-04 00:00 |
17:47:35.06 |
-13:33:58.3 |
HIP 86938 |
29.24 |
| 2026-02-04 12:00 |
17:47:46.32 |
-13:33:38.5 |
HIP 86938 |
31.43 |
| 2026-02-05 00:00 |
17:47:57.52 |
-13:33:18.4 |
HIP 86938 |
33.69 |
| 2026-02-05 12:00 |
17:48:08.66 |
-13:32:58.0 |
HIP 86938 |
36.00 |
| 2026-02-06 00:00 |
17:48:19.73 |
-13:32:37.4 |
HIP 86938 |
38.34 |
| 2026-02-06 12:00 |
17:48:30.73 |
-13:32:16.6 |
HIP 86938 |
40.72 |
| 2026-02-07 00:00 |
17:48:41.67 |
-13:31:55.5 |
HIP 86938 |
43.12 |
| 2026-02-07 12:00 |
17:48:52.55 |
-13:31:34.1 |
HIP 86938 |
45.53 |
| 2026-02-08 00:00 |
17:49:03.36 |
-13:31:12.5 |
HIP 87288 |
45.55 |
| 2026-02-08 12:00 |
17:49:14.09 |
-13:30:50.6 |
HIP 87288 |
45.05 |
| 2026-02-09 00:00 |
17:49:24.77 |
-13:30:28.5 |
HIP 87468 |
43.08 |
| 2026-02-09 12:00 |
17:49:35.37 |
-13:30:06.1 |
HIP 87468 |
40.65 |
| 2026-02-10 00:00 |
17:49:45.90 |
-13:29:43.5 |
HIP 87468 |
38.26 |
| 2026-02-10 12:00 |
17:49:56.36 |
-13:29:20.6 |
HIP 87468 |
35.91 |
| 2026-02-11 00:00 |
17:50:06.75 |
-13:28:57.5 |
HIP 87468 |
33.61 |
| 2026-02-11 12:00 |
17:50:17.07 |
-13:28:34.1 |
HIP 87468 |
31.37 |
| 2026-02-12 00:00 |
17:50:27.32 |
-13:28:10.6 |
HIP 87468 |
29.19 |
| 2026-02-12 12:00 |
17:50:37.50 |
-13:27:46.7 |
HIP 87468 |
27.09 |
| 2026-02-13 00:00 |
17:50:47.60 |
-13:27:22.6 |
HIP 87468 |
25.08 |
| 2026-02-13 12:00 |
17:50:57.63 |
-13:26:58.3 |
HIP 87468 |
23.19 |
| 2026-02-14 00:00 |
17:51:07.58 |
-13:26:33.8 |
HIP 87468 |
21.43 |
| 2026-02-14 12:00 |
17:51:17.46 |
-13:26:09.0 |
HIP 87468 |
19.83 |
| 2026-02-15 00:00 |
17:51:27.27 |
-13:25:44.0 |
HIP 87468 |
18.43 |
| 2026-02-15 12:00 |
17:51:37.00 |
-13:25:18.8 |
HIP 87468 |
17.28 |
| 2026-02-16 00:00 |
17:51:46.65 |
-13:24:53.3 |
HIP 87468 |
16.40 |
| 2026-02-16 12:00 |
17:51:56.22 |
-13:24:27.6 |
HIP 87468 |
15.86 |
| 2026-02-17 00:00 |
17:52:05.71 |
-13:24:01.7 |
HIP 87468 |
15.66 |
| 2026-02-17 12:00 |
17:52:15.13 |
-13:23:35.6 |
HIP 87468 |
15.81 |
| 2026-02-18 00:00 |
17:52:24.47 |
-13:23:09.2 |
HIP 87468 |
16.30 |
| 2026-02-18 12:00 |
17:52:33.72 |
-13:22:42.6 |
HIP 87468 |
17.10 |
| 2026-02-19 00:00 |
17:52:42.90 |
-13:22:15.9 |
HIP 87544 |
17.59 |
| 2026-02-19 12:00 |
17:52:51.99 |
-13:21:48.9 |
HIP 87544 |
17.49 |
| 2026-02-20 00:00 |
17:53:01.01 |
-13:21:21.6 |
HIP 87544 |
17.68 |
| 2026-02-20 12:00 |
17:53:09.94 |
-13:20:54.2 |
HIP 87544 |
18.15 |
| 2026-02-21 00:00 |
17:53:18.79 |
-13:20:26.6 |
HIP 87544 |
18.87 |
| 2026-02-21 12:00 |
17:53:27.55 |
-13:19:58.8 |
HIP 87544 |
19.80 |
| 2026-02-22 00:00 |
17:53:36.24 |
-13:19:30.7 |
HIP 87544 |
20.92 |
| 2026-02-22 12:00 |
17:53:44.83 |
-13:19:02.5 |
HIP 87544 |
22.19 |
| 2026-02-23 00:00 |
17:53:53.35 |
-13:18:34.1 |
HIP 87544 |
23.58 |
| 2026-02-23 12:00 |
17:54:01.78 |
-13:18:05.4 |
HIP 87544 |
25.06 |
| 2026-02-24 00:00 |
17:54:10.12 |
-13:17:36.6 |
HIP 87544 |
26.62 |