メタデータ
| 項目 |
値 |
| Designation |
C/2012 E3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-05-12T22:05:22.326720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:05Z |
| Obs used |
74 |
| NEO |
- |
| M1 |
9.900 |
| 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) |
2012-03-29.0000000 |
| e |
0.98271491 |
| q (au) |
3.827319 |
| a (au) |
221.423057 |
| i (deg) |
105.658608 |
| Ω (om, deg) |
5.530998 |
| ω (w, deg) |
103.515422 |
| M (ma, deg) |
0.096047 |
等級
散乱 + 全体線形
$$
M_a = (11.441 + 2.856\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.441 |
| n |
2.856 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.976 |
| 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) |
| 2026-07-29 00:00 |
08:46:25.63 |
-43:43:05.9 |
HIP 43029 |
4.35 |
| 2026-07-29 12:00 |
08:46:30.21 |
-43:43:13.0 |
HIP 43029 |
5.06 |
| 2026-07-30 00:00 |
08:46:34.80 |
-43:43:20.5 |
HIP 43029 |
5.80 |
| 2026-07-30 12:00 |
08:46:39.39 |
-43:43:28.4 |
HIP 43029 |
6.56 |
| 2026-07-31 00:00 |
08:46:43.98 |
-43:43:36.8 |
HIP 43029 |
7.34 |
| 2026-07-31 12:00 |
08:46:48.56 |
-43:43:45.5 |
HIP 43029 |
8.13 |
| 2026-08-01 00:00 |
08:46:53.15 |
-43:43:54.7 |
HIP 43029 |
8.93 |
| 2026-08-01 12:00 |
08:46:57.74 |
-43:44:04.2 |
HIP 43029 |
9.73 |
| 2026-08-02 00:00 |
08:47:02.33 |
-43:44:14.2 |
HIP 43029 |
10.54 |
| 2026-08-02 12:00 |
08:47:06.92 |
-43:44:24.5 |
HIP 43029 |
11.36 |
| 2026-08-03 00:00 |
08:47:11.51 |
-43:44:35.3 |
HIP 43029 |
12.18 |
| 2026-08-03 12:00 |
08:47:16.09 |
-43:44:46.5 |
HIP 43029 |
13.00 |
| 2026-08-04 00:00 |
08:47:20.68 |
-43:44:58.1 |
HIP 43029 |
13.82 |
| 2026-08-04 12:00 |
08:47:25.26 |
-43:45:10.0 |
HIP 43029 |
14.65 |
| 2026-08-05 00:00 |
08:47:29.84 |
-43:45:22.4 |
HIP 43029 |
15.48 |
| 2026-08-05 12:00 |
08:47:34.42 |
-43:45:35.2 |
HIP 43285 |
16.06 |
| 2026-08-06 00:00 |
08:47:39.00 |
-43:45:48.4 |
HIP 43285 |
15.23 |
| 2026-08-06 12:00 |
08:47:43.57 |
-43:46:02.0 |
HIP 43285 |
14.41 |
| 2026-08-07 00:00 |
08:47:48.14 |
-43:46:16.0 |
HIP 43285 |
13.60 |
| 2026-08-07 12:00 |
08:47:52.70 |
-43:46:30.4 |
HIP 43285 |
12.79 |
| 2026-08-08 00:00 |
08:47:57.27 |
-43:46:45.1 |
HIP 43285 |
11.98 |
| 2026-08-08 12:00 |
08:48:01.82 |
-43:47:00.3 |
HIP 43285 |
11.19 |
| 2026-08-09 00:00 |
08:48:06.38 |
-43:47:15.9 |
HIP 43285 |
10.41 |
| 2026-08-09 12:00 |
08:48:10.92 |
-43:47:31.9 |
HIP 43285 |
9.65 |
| 2026-08-10 00:00 |
08:48:15.47 |
-43:47:48.3 |
HIP 43285 |
8.91 |
| 2026-08-10 12:00 |
08:48:20.00 |
-43:48:05.1 |
HIP 43285 |
8.19 |
| 2026-08-11 00:00 |
08:48:24.53 |
-43:48:22.3 |
HIP 43285 |
7.51 |
| 2026-08-11 12:00 |
08:48:29.06 |
-43:48:39.8 |
HIP 43285 |
6.88 |
| 2026-08-12 00:00 |
08:48:33.58 |
-43:48:57.8 |
HIP 43285 |
6.30 |
| 2026-08-12 12:00 |
08:48:38.09 |
-43:49:16.2 |
HIP 43285 |
5.81 |
| 2026-08-13 00:00 |
08:48:42.59 |
-43:49:34.9 |
HIP 43285 |
5.42 |
| 2026-08-13 12:00 |
08:48:47.09 |
-43:49:54.1 |
HIP 43285 |
5.15 |
| 2026-08-14 00:00 |
08:48:51.57 |
-43:50:13.6 |
HIP 43285 |
5.03 |
| 2026-08-14 12:00 |
08:48:56.05 |
-43:50:33.5 |
HIP 43285 |
5.06 |
| 2026-08-15 00:00 |
08:49:00.52 |
-43:50:53.8 |
HIP 43285 |
5.25 |
| 2026-08-15 12:00 |
08:49:04.99 |
-43:51:14.5 |
HIP 43285 |
5.58 |
| 2026-08-16 00:00 |
08:49:09.44 |
-43:51:35.6 |
HIP 43285 |
6.02 |
| 2026-08-16 12:00 |
08:49:13.88 |
-43:51:57.1 |
HIP 43285 |
6.56 |
| 2026-08-17 00:00 |
08:49:18.31 |
-43:52:18.9 |
HIP 43285 |
7.17 |
| 2026-08-17 12:00 |
08:49:22.74 |
-43:52:41.1 |
HIP 43285 |
7.83 |
| 2026-08-18 00:00 |
08:49:27.15 |
-43:53:03.7 |
HIP 43285 |
8.54 |
| 2026-08-18 12:00 |
08:49:31.55 |
-43:53:26.7 |
HIP 43285 |
9.29 |
| 2026-08-19 00:00 |
08:49:35.94 |
-43:53:50.1 |
HIP 43285 |
10.05 |