メタデータ
| 項目 |
値 |
| Designation |
131P/Mueller 2 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-01-06T10:51:40.682880Z |
| Orbit solution date (soln_date, UTC) |
2026-01-13T22:30:25Z |
| Obs used |
906 |
| NEO |
- |
| M1 |
8.500 |
| K1 |
24.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-07-12.0000000 |
| e |
0.34323033 |
| q (au) |
2.416401 |
| a (au) |
3.679222 |
| i (deg) |
7.354998 |
| Ω (om, deg) |
214.198600 |
| ω (w, deg) |
179.281630 |
| M (ma, deg) |
77.168435 |
等級
散乱 + 全体線形
$$
M_a = (16.656 + 2.200\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.656 |
| n |
2.200 |
| gf |
0.964 |
| gb |
-0.857 |
| k |
0.997 |
| 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) |
| 2026-03-26 00:00 |
02:06:53.15 |
+11:44:18.2 |
HIP 9764 |
32.62 |
| 2026-03-26 12:00 |
02:07:50.35 |
+11:48:29.0 |
HIP 9952 |
37.29 |
| 2026-03-27 00:00 |
02:08:47.60 |
+11:52:39.3 |
HIP 10118 |
24.23 |
| 2026-03-27 12:00 |
02:09:44.89 |
+11:56:48.9 |
HIP 10118 |
11.49 |
| 2026-03-28 00:00 |
02:10:42.22 |
+12:00:58.0 |
HIP 10118 |
10.23 |
| 2026-03-28 12:00 |
02:11:39.60 |
+12:05:06.4 |
HIP 10197 |
16.32 |
| 2026-03-29 00:00 |
02:12:37.03 |
+12:09:14.1 |
HIP 10310 |
18.09 |
| 2026-03-29 12:00 |
02:13:34.50 |
+12:13:21.3 |
HIP 10415 |
10.01 |
| 2026-03-30 00:00 |
02:14:32.01 |
+12:17:27.7 |
HIP 10415 |
4.76 |
| 2026-03-30 12:00 |
02:15:29.57 |
+12:21:33.5 |
HIP 10472 |
10.17 |
| 2026-03-31 00:00 |
02:16:27.18 |
+12:25:38.7 |
HIP 10599 |
2.83 |
| 2026-03-31 12:00 |
02:17:24.82 |
+12:29:43.1 |
HIP 10599 |
15.58 |
| 2026-04-01 00:00 |
02:18:22.51 |
+12:33:46.9 |
HIP 10796 |
23.75 |
| 2026-04-01 12:00 |
02:19:20.25 |
+12:37:49.9 |
HIP 10784 |
22.76 |
| 2026-04-02 00:00 |
02:20:18.03 |
+12:41:52.3 |
HIP 10784 |
27.40 |
| 2026-04-02 12:00 |
02:21:15.85 |
+12:45:54.0 |
HIP 11082 |
24.18 |
| 2026-04-03 00:00 |
02:22:13.71 |
+12:49:54.9 |
HIP 11082 |
17.66 |
| 2026-04-03 12:00 |
02:23:11.61 |
+12:53:55.1 |
HIP 11082 |
21.67 |
| 2026-04-04 00:00 |
02:24:09.56 |
+12:57:54.5 |
HIP 11280 |
17.81 |
| 2026-04-04 12:00 |
02:25:07.55 |
+13:01:53.2 |
HIP 11280 |
11.28 |
| 2026-04-05 00:00 |
02:26:05.58 |
+13:05:51.2 |
HIP 11369 |
13.01 |
| 2026-04-05 12:00 |
02:27:03.65 |
+13:09:48.4 |
HIP 11461 |
16.81 |
| 2026-04-06 00:00 |
02:28:01.77 |
+13:13:44.8 |
HIP 11461 |
16.52 |
| 2026-04-06 12:00 |
02:28:59.92 |
+13:17:40.4 |
HIP 11461 |
26.35 |
| 2026-04-07 00:00 |
02:29:58.12 |
+13:21:35.2 |
HIP 11691 |
12.78 |
| 2026-04-07 12:00 |
02:30:56.35 |
+13:25:29.3 |
HIP 11691 |
2.12 |
| 2026-04-08 00:00 |
02:31:54.63 |
+13:29:22.5 |
HIP 11691 |
16.66 |
| 2026-04-08 12:00 |
02:32:52.95 |
+13:33:14.9 |
HIP 11884 |
6.13 |
| 2026-04-09 00:00 |
02:33:51.30 |
+13:37:06.5 |
HIP 11884 |
8.67 |
| 2026-04-09 12:00 |
02:34:49.70 |
+13:40:57.3 |
HIP 12079 |
15.15 |
| 2026-04-10 00:00 |
02:35:48.14 |
+13:44:47.2 |
HIP 12111 |
3.23 |
| 2026-04-10 12:00 |
02:36:46.61 |
+13:48:36.3 |
HIP 12137 |
10.73 |
| 2026-04-11 00:00 |
02:37:45.13 |
+13:52:24.5 |
HIP 12258 |
16.72 |
| 2026-04-11 12:00 |
02:38:43.68 |
+13:56:11.9 |
HIP 12258 |
18.38 |
| 2026-04-12 00:00 |
02:39:42.27 |
+13:59:58.3 |
HIP 12258 |
28.79 |
| 2026-04-12 12:00 |
02:40:40.90 |
+14:03:43.9 |
HIP 12461 |
32.27 |
| 2026-04-13 00:00 |
02:41:39.56 |
+14:07:28.6 |
HIP 12616 |
29.65 |
| 2026-04-13 12:00 |
02:42:38.27 |
+14:11:12.4 |
HIP 12616 |
25.76 |
| 2026-04-14 00:00 |
02:43:37.01 |
+14:14:55.3 |
HIP 12838 |
20.71 |
| 2026-04-14 12:00 |
02:44:35.78 |
+14:18:37.3 |
HIP 12838 |
7.79 |
| 2026-04-15 00:00 |
02:45:34.59 |
+14:22:18.3 |
HIP 12838 |
11.20 |
| 2026-04-15 12:00 |
02:46:33.44 |
+14:25:58.4 |
HIP 12838 |
24.97 |
| 2026-04-16 00:00 |
02:47:32.32 |
+14:29:37.6 |
HIP 13122 |
19.40 |