C/2012 U1 (PANSTARRS)
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) |
| 2026-02-03 00:00 |
14:03:36.32 |
-26:00:21.2 |
HIP 68434 |
43.35 |
| 2026-02-03 12:00 |
14:03:35.52 |
-26:00:42.6 |
HIP 68434 |
43.06 |
| 2026-02-04 00:00 |
14:03:34.67 |
-26:01:03.9 |
HIP 68434 |
42.75 |
| 2026-02-04 12:00 |
14:03:33.78 |
-26:01:24.9 |
HIP 68434 |
42.44 |
| 2026-02-05 00:00 |
14:03:32.84 |
-26:01:45.7 |
HIP 68434 |
42.13 |
| 2026-02-05 12:00 |
14:03:31.86 |
-26:02:06.2 |
HIP 68434 |
41.80 |
| 2026-02-06 00:00 |
14:03:30.84 |
-26:02:26.6 |
HIP 68434 |
41.47 |
| 2026-02-06 12:00 |
14:03:29.77 |
-26:02:46.6 |
HIP 68434 |
41.14 |
| 2026-02-07 00:00 |
14:03:28.66 |
-26:03:06.5 |
HIP 68434 |
40.79 |
| 2026-02-07 12:00 |
14:03:27.50 |
-26:03:26.1 |
HIP 68434 |
40.45 |
| 2026-02-08 00:00 |
14:03:26.30 |
-26:03:45.5 |
HIP 68434 |
40.09 |
| 2026-02-08 12:00 |
14:03:25.05 |
-26:04:04.7 |
HIP 68434 |
39.73 |
| 2026-02-09 00:00 |
14:03:23.76 |
-26:04:23.6 |
HIP 68434 |
39.35 |
| 2026-02-09 12:00 |
14:03:22.43 |
-26:04:42.3 |
HIP 68434 |
38.98 |
| 2026-02-10 00:00 |
14:03:21.05 |
-26:05:00.7 |
HIP 68434 |
38.59 |
| 2026-02-10 12:00 |
14:03:19.63 |
-26:05:18.9 |
HIP 68434 |
38.20 |
| 2026-02-11 00:00 |
14:03:18.17 |
-26:05:36.8 |
HIP 68434 |
37.80 |
| 2026-02-11 12:00 |
14:03:16.66 |
-26:05:54.5 |
HIP 68434 |
37.40 |
| 2026-02-12 00:00 |
14:03:15.11 |
-26:06:12.0 |
HIP 68434 |
36.98 |
| 2026-02-12 12:00 |
14:03:13.52 |
-26:06:29.2 |
HIP 68434 |
36.56 |
| 2026-02-13 00:00 |
14:03:11.88 |
-26:06:46.2 |
HIP 68434 |
36.13 |
| 2026-02-13 12:00 |
14:03:10.20 |
-26:07:02.9 |
HIP 68434 |
35.70 |
| 2026-02-14 00:00 |
14:03:08.48 |
-26:07:19.4 |
HIP 68434 |
35.25 |
| 2026-02-14 12:00 |
14:03:06.71 |
-26:07:35.6 |
HIP 68434 |
34.80 |
| 2026-02-15 00:00 |
14:03:04.90 |
-26:07:51.6 |
HIP 68434 |
34.34 |
| 2026-02-15 12:00 |
14:03:03.05 |
-26:08:07.3 |
HIP 68434 |
33.88 |
| 2026-02-16 00:00 |
14:03:01.15 |
-26:08:22.7 |
HIP 68434 |
33.41 |
| 2026-02-16 12:00 |
14:02:59.21 |
-26:08:38.0 |
HIP 68434 |
32.92 |
| 2026-02-17 00:00 |
14:02:57.24 |
-26:08:52.9 |
HIP 68434 |
32.44 |
| 2026-02-17 12:00 |
14:02:55.21 |
-26:09:07.6 |
HIP 68434 |
31.94 |
| 2026-02-18 00:00 |
14:02:53.15 |
-26:09:22.1 |
HIP 68434 |
31.44 |
| 2026-02-18 12:00 |
14:02:51.04 |
-26:09:36.3 |
HIP 68434 |
30.92 |
| 2026-02-19 00:00 |
14:02:48.90 |
-26:09:50.2 |
HIP 68434 |
30.40 |
| 2026-02-19 12:00 |
14:02:46.71 |
-26:10:03.9 |
HIP 68434 |
29.88 |
| 2026-02-20 00:00 |
14:02:44.48 |
-26:10:17.3 |
HIP 68434 |
29.34 |
| 2026-02-20 12:00 |
14:02:42.21 |
-26:10:30.5 |
HIP 68434 |
28.80 |
| 2026-02-21 00:00 |
14:02:39.90 |
-26:10:43.4 |
HIP 68434 |
28.25 |
| 2026-02-21 12:00 |
14:02:37.55 |
-26:10:56.0 |
HIP 68434 |
27.69 |
| 2026-02-22 00:00 |
14:02:35.15 |
-26:11:08.4 |
HIP 68434 |
27.13 |
| 2026-02-22 12:00 |
14:02:32.72 |
-26:11:20.5 |
HIP 68434 |
26.55 |
| 2026-02-23 00:00 |
14:02:30.25 |
-26:11:32.4 |
HIP 68434 |
25.97 |
| 2026-02-23 12:00 |
14:02:27.73 |
-26:11:44.0 |
HIP 68434 |
25.39 |
| 2026-02-24 00:00 |
14:02:25.18 |
-26:11:55.3 |
HIP 68434 |
24.79 |