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131P/Mueller 2

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

131P/Mueller 2 · Magnitude (Full range)

散乱 + 全体線形

$$ M_a = (13.561 + 5.146\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目 値
H0 13.561
n 5.146
gf 0.932
gb -0.846
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)
2026-02-03 00:00 00:34:59.42 +04:19:23.3 HIP 2736 3.56
2026-02-03 12:00 00:35:49.64 +04:23:35.5 HIP 2781 7.90
2026-02-04 00:00 00:36:39.94 +04:27:48.2 HIP 2781 20.46
2026-02-04 12:00 00:37:30.35 +04:32:01.6 HIP 3000 12.48
2026-02-05 00:00 00:38:20.84 +04:36:15.6 HIP 3000 12.86
2026-02-05 12:00 00:39:11.42 +04:40:30.1 HIP 3000 22.99
2026-02-06 00:00 00:40:02.10 +04:44:45.1 HIP 3208 19.99
2026-02-06 12:00 00:40:52.87 +04:49:00.7 HIP 3208 20.32
2026-02-07 00:00 00:41:43.72 +04:53:16.8 HIP 3319 10.14
2026-02-07 12:00 00:42:34.67 +04:57:33.4 HIP 3319 9.65
2026-02-08 00:00 00:43:25.71 +05:01:50.6 HIP 3319 21.05
2026-02-08 12:00 00:44:16.83 +05:06:08.2 HIP 3534 12.78
2026-02-09 00:00 00:45:08.04 +05:10:26.3 HIP 3534 1.01
2026-02-09 12:00 00:45:59.34 +05:14:44.8 HIP 3651 12.81
2026-02-10 00:00 00:46:50.73 +05:19:03.8 HIP 3651 2.23
2026-02-10 12:00 00:47:42.20 +05:23:23.3 HIP 3765 11.90
2026-02-11 00:00 00:48:33.76 +05:27:43.2 HIP 3829 9.68
2026-02-11 12:00 00:49:25.41 +05:32:03.5 HIP 3829 9.27
2026-02-12 00:00 00:50:17.14 +05:36:24.2 HIP 4014 20.88
2026-02-12 12:00 00:51:08.95 +05:40:45.3 HIP 4014 8.26
2026-02-13 00:00 00:52:00.85 +05:45:06.8 HIP 4014 8.43
2026-02-13 12:00 00:52:52.83 +05:49:28.6 HIP 4231 16.29
2026-02-14 00:00 00:53:44.90 +05:53:50.8 HIP 4231 6.25
2026-02-14 12:00 00:54:37.05 +05:58:13.4 HIP 4231 13.67
2026-02-15 00:00 00:55:29.28 +06:02:36.2 HIP 4231 26.65
2026-02-15 12:00 00:56:21.59 +06:06:59.4 HIP 4518 27.28
2026-02-16 00:00 00:57:13.98 +06:11:22.9 HIP 4518 21.52
2026-02-16 12:00 00:58:06.45 +06:15:46.7 HIP 4518 23.67
2026-02-17 00:00 00:58:59.00 +06:20:10.8 HIP 4655 15.37
2026-02-17 12:00 00:59:51.64 +06:24:35.1 HIP 4655 4.44
2026-02-18 00:00 01:00:44.34 +06:28:59.7 HIP 4655 13.58
2026-02-18 12:00 01:01:37.13 +06:33:24.5 HIP 4655 27.05
2026-02-19 00:00 01:02:30.00 +06:37:49.6 HIP 4978 20.78
2026-02-19 12:00 01:03:22.94 +06:42:14.9 HIP 4978 7.03
2026-02-20 00:00 01:04:15.95 +06:46:40.3 HIP 4978 7.20
2026-02-20 12:00 01:05:09.05 +06:51:06.0 HIP 5073 12.56
2026-02-21 00:00 01:06:02.21 +06:55:31.8 HIP 5218 18.63
2026-02-21 12:00 01:06:55.45 +06:59:57.7 HIP 5218 20.17
2026-02-22 00:00 01:07:48.76 +07:04:23.9 HIP 5218 29.25
2026-02-22 12:00 01:08:42.15 +07:08:50.1 HIP 5382 22.84
2026-02-23 00:00 01:09:35.61 +07:13:16.4 HIP 5382 21.33
2026-02-23 12:00 01:10:29.14 +07:17:42.9 HIP 5382 27.92
2026-02-24 00:00 01:11:22.74 +07:22:09.5 HIP 5562 27.53