メタデータ
| 項目 |
値 |
| Designation |
C/1991 X2 (Mueller) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1992-03-21T04:48:32.227200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:41Z |
| Obs used |
149 |
| NEO |
- |
| M1 |
12.100 |
| K1 |
16.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1992-01-30.0000000 |
| e |
1.00020139 |
| q (au) |
0.198797 |
| a (au) |
-987.134248 |
| i (deg) |
95.574370 |
| Ω (om, deg) |
288.783115 |
| ω (w, deg) |
306.985362 |
| M (ma, deg) |
-0.001627 |
等級
散乱 + 全体線形
$$
M_a = (10.627 + 5.215\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.627 |
| n |
5.215 |
| 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) |
| 2026-06-01 00:00 |
10:39:29.69 |
+75:30:55.7 |
HIP 51808 |
20.24 |
| 2026-06-01 12:00 |
10:39:29.86 |
+75:30:28.4 |
HIP 51808 |
20.52 |
| 2026-06-02 00:00 |
10:39:30.08 |
+75:30:01.1 |
HIP 51808 |
20.81 |
| 2026-06-02 12:00 |
10:39:30.37 |
+75:29:33.7 |
HIP 51808 |
21.11 |
| 2026-06-03 00:00 |
10:39:30.72 |
+75:29:06.4 |
HIP 51808 |
21.42 |
| 2026-06-03 12:00 |
10:39:31.13 |
+75:28:39.0 |
HIP 51808 |
21.73 |
| 2026-06-04 00:00 |
10:39:31.60 |
+75:28:11.6 |
HIP 51808 |
22.06 |
| 2026-06-04 12:00 |
10:39:32.13 |
+75:27:44.2 |
HIP 51808 |
22.39 |
| 2026-06-05 00:00 |
10:39:32.72 |
+75:27:16.8 |
HIP 51808 |
22.73 |
| 2026-06-05 12:00 |
10:39:33.36 |
+75:26:49.3 |
HIP 51808 |
23.08 |
| 2026-06-06 00:00 |
10:39:34.07 |
+75:26:21.9 |
HIP 51808 |
23.43 |
| 2026-06-06 12:00 |
10:39:34.84 |
+75:25:54.4 |
HIP 51808 |
23.79 |
| 2026-06-07 00:00 |
10:39:35.67 |
+75:25:27.0 |
HIP 51808 |
24.15 |
| 2026-06-07 12:00 |
10:39:36.56 |
+75:24:59.5 |
HIP 51808 |
24.53 |
| 2026-06-08 00:00 |
10:39:37.50 |
+75:24:32.1 |
HIP 51808 |
24.90 |
| 2026-06-08 12:00 |
10:39:38.51 |
+75:24:04.6 |
HIP 51808 |
25.28 |
| 2026-06-09 00:00 |
10:39:39.58 |
+75:23:37.2 |
HIP 51808 |
25.67 |
| 2026-06-09 12:00 |
10:39:40.70 |
+75:23:09.7 |
HIP 51808 |
26.06 |
| 2026-06-10 00:00 |
10:39:41.88 |
+75:22:42.3 |
HIP 51808 |
26.46 |
| 2026-06-10 12:00 |
10:39:43.12 |
+75:22:14.9 |
HIP 51808 |
26.86 |
| 2026-06-11 00:00 |
10:39:44.42 |
+75:21:47.4 |
HIP 51808 |
27.27 |
| 2026-06-11 12:00 |
10:39:45.78 |
+75:21:20.0 |
HIP 51808 |
27.68 |
| 2026-06-12 00:00 |
10:39:47.19 |
+75:20:52.6 |
HIP 51808 |
28.09 |
| 2026-06-12 12:00 |
10:39:48.67 |
+75:20:25.3 |
HIP 51808 |
28.51 |
| 2026-06-13 00:00 |
10:39:50.20 |
+75:19:57.9 |
HIP 51808 |
28.93 |
| 2026-06-13 12:00 |
10:39:51.78 |
+75:19:30.5 |
HIP 51808 |
29.35 |
| 2026-06-14 00:00 |
10:39:53.43 |
+75:19:03.2 |
HIP 51808 |
29.78 |
| 2026-06-14 12:00 |
10:39:55.13 |
+75:18:35.9 |
HIP 51808 |
30.21 |
| 2026-06-15 00:00 |
10:39:56.89 |
+75:18:08.7 |
HIP 51808 |
30.64 |
| 2026-06-15 12:00 |
10:39:58.71 |
+75:17:41.4 |
HIP 51808 |
31.08 |
| 2026-06-16 00:00 |
10:40:00.58 |
+75:17:14.2 |
HIP 51808 |
31.52 |
| 2026-06-16 12:00 |
10:40:02.50 |
+75:16:47.0 |
HIP 51808 |
31.96 |
| 2026-06-17 00:00 |
10:40:04.49 |
+75:16:19.9 |
HIP 52618 |
32.29 |
| 2026-06-17 12:00 |
10:40:06.53 |
+75:15:52.8 |
HIP 52618 |
31.87 |
| 2026-06-18 00:00 |
10:40:08.62 |
+75:15:25.7 |
HIP 52618 |
31.44 |
| 2026-06-18 12:00 |
10:40:10.77 |
+75:14:58.6 |
HIP 52618 |
31.02 |
| 2026-06-19 00:00 |
10:40:12.97 |
+75:14:31.6 |
HIP 52618 |
30.60 |
| 2026-06-19 12:00 |
10:40:15.23 |
+75:14:04.7 |
HIP 52618 |
30.17 |
| 2026-06-20 00:00 |
10:40:17.54 |
+75:13:37.8 |
HIP 52618 |
29.75 |
| 2026-06-20 12:00 |
10:40:19.91 |
+75:13:10.9 |
HIP 52618 |
29.32 |
| 2026-06-21 00:00 |
10:40:22.33 |
+75:12:44.1 |
HIP 52618 |
28.89 |
| 2026-06-21 12:00 |
10:40:24.80 |
+75:12:17.3 |
HIP 52618 |
28.47 |
| 2026-06-22 00:00 |
10:40:27.33 |
+75:11:50.6 |
HIP 52618 |
28.04 |