メタデータ
| 項目 |
値 |
| Designation |
C/2012 U1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-07-04T17:20:39.560640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:25Z |
| Obs used |
172 |
| NEO |
- |
| M1 |
8.300 |
| 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) |
2013-12-31.0000000 |
| e |
0.99956488 |
| q (au) |
5.263903 |
| a (au) |
12097.722849 |
| i (deg) |
56.339020 |
| Ω (om, deg) |
26.982573 |
| ω (w, deg) |
70.049903 |
| M (ma, deg) |
359.999862 |
等級
散乱 + 全体線形
$$
M_a = (3.230 + 5.910\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.230 |
| n |
5.910 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| 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) |
| 2026-05-12 00:00 |
13:51:16.66 |
-25:53:35.4 |
HIP 67458 |
36.79 |
| 2026-05-12 12:00 |
13:51:12.09 |
-25:53:14.9 |
HIP 67458 |
36.37 |
| 2026-05-13 00:00 |
13:51:07.53 |
-25:52:54.4 |
HIP 67458 |
35.99 |
| 2026-05-13 12:00 |
13:51:03.00 |
-25:52:33.7 |
HIP 67490 |
35.59 |
| 2026-05-14 00:00 |
13:50:58.48 |
-25:52:13.0 |
HIP 67490 |
34.81 |
| 2026-05-14 12:00 |
13:50:53.98 |
-25:51:52.3 |
HIP 67490 |
34.05 |
| 2026-05-15 00:00 |
13:50:49.50 |
-25:51:31.5 |
HIP 67490 |
33.31 |
| 2026-05-15 12:00 |
13:50:45.03 |
-25:51:10.6 |
HIP 67490 |
32.59 |
| 2026-05-16 00:00 |
13:50:40.59 |
-25:50:49.7 |
HIP 67490 |
31.88 |
| 2026-05-16 12:00 |
13:50:36.17 |
-25:50:28.7 |
HIP 67490 |
31.20 |
| 2026-05-17 00:00 |
13:50:31.77 |
-25:50:07.7 |
HIP 67490 |
30.54 |
| 2026-05-17 12:00 |
13:50:27.39 |
-25:49:46.6 |
HIP 67490 |
29.91 |
| 2026-05-18 00:00 |
13:50:23.04 |
-25:49:25.5 |
HIP 67490 |
29.29 |
| 2026-05-18 12:00 |
13:50:18.70 |
-25:49:04.3 |
HIP 67490 |
28.71 |
| 2026-05-19 00:00 |
13:50:14.39 |
-25:48:43.1 |
HIP 67490 |
28.15 |
| 2026-05-19 12:00 |
13:50:10.10 |
-25:48:21.9 |
HIP 67490 |
27.61 |
| 2026-05-20 00:00 |
13:50:05.83 |
-25:48:00.6 |
HIP 67490 |
27.11 |
| 2026-05-20 12:00 |
13:50:01.59 |
-25:47:39.3 |
HIP 67490 |
26.63 |
| 2026-05-21 00:00 |
13:49:57.37 |
-25:47:18.0 |
HIP 67490 |
26.19 |
| 2026-05-21 12:00 |
13:49:53.17 |
-25:46:56.7 |
HIP 67490 |
25.78 |
| 2026-05-22 00:00 |
13:49:49.00 |
-25:46:35.3 |
HIP 67490 |
25.40 |
| 2026-05-22 12:00 |
13:49:44.86 |
-25:46:13.9 |
HIP 67490 |
25.06 |
| 2026-05-23 00:00 |
13:49:40.74 |
-25:45:52.5 |
HIP 67490 |
24.75 |
| 2026-05-23 12:00 |
13:49:36.64 |
-25:45:31.1 |
HIP 67490 |
24.48 |
| 2026-05-24 00:00 |
13:49:32.57 |
-25:45:09.7 |
HIP 67490 |
24.24 |
| 2026-05-24 12:00 |
13:49:28.53 |
-25:44:48.3 |
HIP 67490 |
24.05 |
| 2026-05-25 00:00 |
13:49:24.51 |
-25:44:26.8 |
HIP 67490 |
23.88 |
| 2026-05-25 12:00 |
13:49:20.52 |
-25:44:05.4 |
HIP 67490 |
23.76 |
| 2026-05-26 00:00 |
13:49:16.55 |
-25:43:43.9 |
HIP 67490 |
23.67 |
| 2026-05-26 12:00 |
13:49:12.61 |
-25:43:22.5 |
HIP 67490 |
23.62 |
| 2026-05-27 00:00 |
13:49:08.70 |
-25:43:01.0 |
HIP 67490 |
23.61 |
| 2026-05-27 12:00 |
13:49:04.82 |
-25:42:39.6 |
HIP 67490 |
23.63 |
| 2026-05-28 00:00 |
13:49:00.96 |
-25:42:18.2 |
HIP 67490 |
23.69 |
| 2026-05-28 12:00 |
13:48:57.14 |
-25:41:56.7 |
HIP 67490 |
23.78 |
| 2026-05-29 00:00 |
13:48:53.34 |
-25:41:35.3 |
HIP 67490 |
23.90 |
| 2026-05-29 12:00 |
13:48:49.57 |
-25:41:13.9 |
HIP 67490 |
24.06 |
| 2026-05-30 00:00 |
13:48:45.82 |
-25:40:52.5 |
HIP 67490 |
24.24 |
| 2026-05-30 12:00 |
13:48:42.11 |
-25:40:31.2 |
HIP 67490 |
24.46 |
| 2026-05-31 00:00 |
13:48:38.43 |
-25:40:09.8 |
HIP 67490 |
24.70 |
| 2026-05-31 12:00 |
13:48:34.77 |
-25:39:48.5 |
HIP 67490 |
24.97 |
| 2026-06-01 00:00 |
13:48:31.15 |
-25:39:27.2 |
HIP 67490 |
25.27 |
| 2026-06-01 12:00 |
13:48:27.56 |
-25:39:06.0 |
HIP 67490 |
25.58 |
| 2026-06-02 00:00 |
13:48:23.99 |
-25:38:44.7 |
HIP 67490 |
25.92 |