メタデータ
| 項目 |
値 |
| Designation |
131P/Mueller 2 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-01-06T10:35:26.125440Z |
| Orbit solution date (soln_date, UTC) |
2026-07-20T21:57:17Z |
| Obs used |
908 |
| 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) |
2013-07-22.0000000 |
| e |
0.34322409 |
| q (au) |
2.416385 |
| a (au) |
3.679162 |
| i (deg) |
7.355011 |
| Ω (om, deg) |
214.198390 |
| ω (w, deg) |
179.279518 |
| M (ma, deg) |
78.568513 |
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 |
0.955 |
| 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) |
| 2026-07-29 00:00 |
06:10:36.97 |
+19:19:35.9 |
HIP 29190 |
17.37 |
| 2026-07-29 12:00 |
06:11:30.53 |
+19:18:33.2 |
HIP 29221 |
28.73 |
| 2026-07-30 00:00 |
06:12:24.00 |
+19:17:29.2 |
HIP 29566 |
19.08 |
| 2026-07-30 12:00 |
06:13:17.36 |
+19:16:24.0 |
HIP 29566 |
7.28 |
| 2026-07-31 00:00 |
06:14:10.63 |
+19:15:17.6 |
HIP 29566 |
7.82 |
| 2026-07-31 12:00 |
06:15:03.79 |
+19:14:09.9 |
HIP 29650 |
5.64 |
| 2026-08-01 00:00 |
06:15:56.86 |
+19:13:00.9 |
HIP 29775 |
10.14 |
| 2026-08-01 12:00 |
06:16:49.82 |
+19:11:50.8 |
HIP 29775 |
12.82 |
| 2026-08-02 00:00 |
06:17:42.68 |
+19:10:39.4 |
HIP 29909 |
16.89 |
| 2026-08-02 12:00 |
06:18:35.43 |
+19:09:26.7 |
HIP 29909 |
20.83 |
| 2026-08-03 00:00 |
06:19:28.08 |
+19:08:12.9 |
HIP 29909 |
29.92 |
| 2026-08-03 12:00 |
06:20:20.63 |
+19:06:57.9 |
HIP 30312 |
35.16 |
| 2026-08-04 00:00 |
06:21:13.07 |
+19:05:41.6 |
HIP 30312 |
24.30 |
| 2026-08-04 12:00 |
06:22:05.41 |
+19:04:24.2 |
HIP 30312 |
15.99 |
| 2026-08-05 00:00 |
06:22:57.63 |
+19:03:05.5 |
HIP 30312 |
15.14 |
| 2026-08-05 12:00 |
06:23:49.75 |
+19:01:45.7 |
HIP 30312 |
22.58 |
| 2026-08-06 00:00 |
06:24:41.76 |
+19:00:24.7 |
HIP 30630 |
25.75 |
| 2026-08-06 12:00 |
06:25:33.66 |
+18:59:02.5 |
HIP 30630 |
16.13 |
| 2026-08-07 00:00 |
06:26:25.45 |
+18:57:39.1 |
HIP 30630 |
12.73 |
| 2026-08-07 12:00 |
06:27:17.13 |
+18:56:14.6 |
HIP 30773 |
12.29 |
| 2026-08-08 00:00 |
06:28:08.69 |
+18:54:48.9 |
HIP 30773 |
6.46 |
| 2026-08-08 12:00 |
06:29:00.14 |
+18:53:22.1 |
HIP 30773 |
15.27 |
| 2026-08-09 00:00 |
06:29:51.47 |
+18:51:54.1 |
HIP 31014 |
26.73 |
| 2026-08-09 12:00 |
06:30:42.69 |
+18:50:25.0 |
HIP 31014 |
26.92 |
| 2026-08-10 00:00 |
06:31:33.80 |
+18:48:54.7 |
HIP 31258 |
25.62 |
| 2026-08-10 12:00 |
06:32:24.78 |
+18:47:23.4 |
HIP 31258 |
13.49 |
| 2026-08-11 00:00 |
06:33:15.65 |
+18:45:50.9 |
HIP 31258 |
1.82 |
| 2026-08-11 12:00 |
06:34:06.39 |
+18:44:17.2 |
HIP 31261 |
10.70 |
| 2026-08-12 00:00 |
06:34:57.01 |
+18:42:42.5 |
HIP 31261 |
22.70 |
| 2026-08-12 12:00 |
06:35:47.52 |
+18:41:06.7 |
HIP 31713 |
32.48 |
| 2026-08-13 00:00 |
06:36:37.90 |
+18:39:29.8 |
HIP 31713 |
20.54 |
| 2026-08-13 12:00 |
06:37:28.15 |
+18:37:51.8 |
HIP 31713 |
8.89 |
| 2026-08-14 00:00 |
06:38:18.28 |
+18:36:12.7 |
HIP 31713 |
4.99 |
| 2026-08-14 12:00 |
06:39:08.28 |
+18:34:32.6 |
HIP 31734 |
12.54 |
| 2026-08-15 00:00 |
06:39:58.16 |
+18:32:51.4 |
HIP 32005 |
17.87 |
| 2026-08-15 12:00 |
06:40:47.90 |
+18:31:09.2 |
HIP 32005 |
6.90 |
| 2026-08-16 00:00 |
06:41:37.52 |
+18:29:25.9 |
HIP 32005 |
7.73 |
| 2026-08-16 12:00 |
06:42:27.01 |
+18:27:41.6 |
HIP 32005 |
18.81 |
| 2026-08-17 00:00 |
06:43:16.37 |
+18:25:56.2 |
HIP 32238 |
15.28 |
| 2026-08-17 12:00 |
06:44:05.60 |
+18:24:09.8 |
HIP 32238 |
15.80 |
| 2026-08-18 00:00 |
06:44:54.70 |
+18:22:22.5 |
HIP 32238 |
23.33 |
| 2026-08-18 12:00 |
06:45:43.66 |
+18:20:34.1 |
HIP 32532 |
22.72 |
| 2026-08-19 00:00 |
06:46:32.49 |
+18:18:44.7 |
HIP 32532 |
11.12 |