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 |
-0.501 |
| 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) |
| 2026-09-20 00:00 |
13:50:18.14 |
-25:23:54.0 |
HIP 67490 |
7.22 |
| 2026-09-20 12:00 |
13:50:22.26 |
-25:24:13.6 |
HIP 67490 |
8.21 |
| 2026-09-21 00:00 |
13:50:26.39 |
-25:24:33.3 |
HIP 67490 |
9.20 |
| 2026-09-21 12:00 |
13:50:30.55 |
-25:24:53.3 |
HIP 67490 |
10.19 |
| 2026-09-22 00:00 |
13:50:34.72 |
-25:25:13.4 |
HIP 67490 |
11.19 |
| 2026-09-22 12:00 |
13:50:38.91 |
-25:25:33.8 |
HIP 67490 |
12.20 |
| 2026-09-23 00:00 |
13:50:43.12 |
-25:25:54.4 |
HIP 67490 |
13.21 |
| 2026-09-23 12:00 |
13:50:47.35 |
-25:26:15.1 |
HIP 67490 |
14.22 |
| 2026-09-24 00:00 |
13:50:51.59 |
-25:26:36.1 |
HIP 67490 |
15.24 |
| 2026-09-24 12:00 |
13:50:55.86 |
-25:26:57.3 |
HIP 67490 |
16.27 |
| 2026-09-25 00:00 |
13:51:00.14 |
-25:27:18.6 |
HIP 67490 |
17.30 |
| 2026-09-25 12:00 |
13:51:04.43 |
-25:27:40.2 |
HIP 67490 |
18.33 |
| 2026-09-26 00:00 |
13:51:08.75 |
-25:28:02.0 |
HIP 67490 |
19.37 |
| 2026-09-26 12:00 |
13:51:13.08 |
-25:28:23.9 |
HIP 67490 |
20.41 |
| 2026-09-27 00:00 |
13:51:17.42 |
-25:28:46.1 |
HIP 67490 |
21.46 |
| 2026-09-27 12:00 |
13:51:21.79 |
-25:29:08.4 |
HIP 67490 |
22.51 |
| 2026-09-28 00:00 |
13:51:26.16 |
-25:29:30.9 |
HIP 67490 |
23.57 |
| 2026-09-28 12:00 |
13:51:30.56 |
-25:29:53.6 |
HIP 67490 |
24.63 |
| 2026-09-29 00:00 |
13:51:34.96 |
-25:30:16.5 |
HIP 67490 |
25.70 |
| 2026-09-29 12:00 |
13:51:39.39 |
-25:30:39.6 |
HIP 67490 |
26.77 |
| 2026-09-30 00:00 |
13:51:43.83 |
-25:31:02.9 |
HIP 67490 |
27.84 |
| 2026-09-30 12:00 |
13:51:48.28 |
-25:31:26.4 |
HIP 67490 |
28.92 |
| 2026-10-01 00:00 |
13:51:52.75 |
-25:31:50.1 |
HIP 67490 |
30.00 |
| 2026-10-01 12:00 |
13:51:57.23 |
-25:32:13.9 |
HIP 67490 |
31.09 |
| 2026-10-02 00:00 |
13:52:01.72 |
-25:32:37.9 |
HIP 67490 |
32.18 |
| 2026-10-02 12:00 |
13:52:06.23 |
-25:33:02.2 |
HIP 67490 |
33.27 |
| 2026-10-03 00:00 |
13:52:10.75 |
-25:33:26.6 |
HIP 67490 |
34.37 |
| 2026-10-03 12:00 |
13:52:15.28 |
-25:33:51.1 |
HIP 67490 |
35.47 |
| 2026-10-04 00:00 |
13:52:19.83 |
-25:34:15.9 |
HIP 67490 |
36.58 |
| 2026-10-04 12:00 |
13:52:24.39 |
-25:34:40.8 |
HIP 67490 |
37.68 |
| 2026-10-05 00:00 |
13:52:28.96 |
-25:35:06.0 |
HIP 67490 |
38.80 |
| 2026-10-05 12:00 |
13:52:33.54 |
-25:35:31.3 |
HIP 67490 |
39.91 |
| 2026-10-06 00:00 |
13:52:38.14 |
-25:35:56.7 |
HIP 67490 |
41.03 |
| 2026-10-06 12:00 |
13:52:42.74 |
-25:36:22.4 |
HIP 68028 |
41.99 |
| 2026-10-07 00:00 |
13:52:47.36 |
-25:36:48.2 |
HIP 68028 |
40.94 |
| 2026-10-07 12:00 |
13:52:51.98 |
-25:37:14.2 |
HIP 68028 |
39.90 |
| 2026-10-08 00:00 |
13:52:56.62 |
-25:37:40.4 |
HIP 68028 |
38.86 |
| 2026-10-08 12:00 |
13:53:01.27 |
-25:38:06.7 |
HIP 68028 |
37.82 |
| 2026-10-09 00:00 |
13:53:05.93 |
-25:38:33.2 |
HIP 68028 |
36.79 |
| 2026-10-09 12:00 |
13:53:10.59 |
-25:38:59.9 |
HIP 68028 |
35.76 |
| 2026-10-10 00:00 |
13:53:15.27 |
-25:39:26.7 |
HIP 68028 |
34.74 |
| 2026-10-10 12:00 |
13:53:19.95 |
-25:39:53.8 |
HIP 68028 |
33.72 |
| 2026-10-11 00:00 |
13:53:24.64 |
-25:40:20.9 |
HIP 68028 |
32.71 |