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) |
| 2026-09-20 00:00 |
10:56:59.83 |
+74:27:57.7 |
HIP 53564 |
8.00 |
| 2026-09-20 12:00 |
10:57:06.31 |
+74:28:00.5 |
HIP 53564 |
7.95 |
| 2026-09-21 00:00 |
10:57:12.77 |
+74:28:03.6 |
HIP 53564 |
7.94 |
| 2026-09-21 12:00 |
10:57:19.22 |
+74:28:06.8 |
HIP 53564 |
7.95 |
| 2026-09-22 00:00 |
10:57:25.66 |
+74:28:10.3 |
HIP 53564 |
7.99 |
| 2026-09-22 12:00 |
10:57:32.08 |
+74:28:14.1 |
HIP 53564 |
8.06 |
| 2026-09-23 00:00 |
10:57:38.49 |
+74:28:18.0 |
HIP 53564 |
8.15 |
| 2026-09-23 12:00 |
10:57:44.88 |
+74:28:22.2 |
HIP 53564 |
8.27 |
| 2026-09-24 00:00 |
10:57:51.26 |
+74:28:26.6 |
HIP 53564 |
8.41 |
| 2026-09-24 12:00 |
10:57:57.62 |
+74:28:31.2 |
HIP 53564 |
8.58 |
| 2026-09-25 00:00 |
10:58:03.96 |
+74:28:36.0 |
HIP 53564 |
8.77 |
| 2026-09-25 12:00 |
10:58:10.29 |
+74:28:41.1 |
HIP 53564 |
8.97 |
| 2026-09-26 00:00 |
10:58:16.60 |
+74:28:46.4 |
HIP 53564 |
9.20 |
| 2026-09-26 12:00 |
10:58:22.89 |
+74:28:51.9 |
HIP 53564 |
9.44 |
| 2026-09-27 00:00 |
10:58:29.16 |
+74:28:57.6 |
HIP 53564 |
9.70 |
| 2026-09-27 12:00 |
10:58:35.42 |
+74:29:03.5 |
HIP 53564 |
9.98 |
| 2026-09-28 00:00 |
10:58:41.65 |
+74:29:09.7 |
HIP 53564 |
10.27 |
| 2026-09-28 12:00 |
10:58:47.87 |
+74:29:16.1 |
HIP 53564 |
10.57 |
| 2026-09-29 00:00 |
10:58:54.07 |
+74:29:22.7 |
HIP 53656 |
10.50 |
| 2026-09-29 12:00 |
10:59:00.25 |
+74:29:29.5 |
HIP 53656 |
10.44 |
| 2026-09-30 00:00 |
10:59:06.41 |
+74:29:36.6 |
HIP 53656 |
10.39 |
| 2026-09-30 12:00 |
10:59:12.55 |
+74:29:43.8 |
HIP 53656 |
10.35 |
| 2026-10-01 00:00 |
10:59:18.67 |
+74:29:51.3 |
HIP 53656 |
10.33 |
| 2026-10-01 12:00 |
10:59:24.76 |
+74:29:59.0 |
HIP 53656 |
10.32 |
| 2026-10-02 00:00 |
10:59:30.84 |
+74:30:07.0 |
HIP 53656 |
10.33 |
| 2026-10-02 12:00 |
10:59:36.89 |
+74:30:15.1 |
HIP 53656 |
10.35 |
| 2026-10-03 00:00 |
10:59:42.92 |
+74:30:23.5 |
HIP 53656 |
10.38 |
| 2026-10-03 12:00 |
10:59:48.93 |
+74:30:32.1 |
HIP 53656 |
10.42 |
| 2026-10-04 00:00 |
10:59:54.91 |
+74:30:40.9 |
HIP 53656 |
10.48 |
| 2026-10-04 12:00 |
11:00:00.87 |
+74:30:49.9 |
HIP 53656 |
10.55 |
| 2026-10-05 00:00 |
11:00:06.81 |
+74:30:59.1 |
HIP 53656 |
10.63 |
| 2026-10-05 12:00 |
11:00:12.72 |
+74:31:08.6 |
HIP 53656 |
10.73 |
| 2026-10-06 00:00 |
11:00:18.61 |
+74:31:18.3 |
HIP 53656 |
10.83 |
| 2026-10-06 12:00 |
11:00:24.47 |
+74:31:28.2 |
HIP 53656 |
10.95 |
| 2026-10-07 00:00 |
11:00:30.30 |
+74:31:38.3 |
HIP 53656 |
11.08 |
| 2026-10-07 12:00 |
11:00:36.11 |
+74:31:48.6 |
HIP 53656 |
11.22 |
| 2026-10-08 00:00 |
11:00:41.89 |
+74:31:59.2 |
HIP 53656 |
11.37 |
| 2026-10-08 12:00 |
11:00:47.65 |
+74:32:09.9 |
HIP 53656 |
11.53 |
| 2026-10-09 00:00 |
11:00:53.38 |
+74:32:20.9 |
HIP 53656 |
11.70 |
| 2026-10-09 12:00 |
11:00:59.07 |
+74:32:32.1 |
HIP 53656 |
11.87 |
| 2026-10-10 00:00 |
11:01:04.75 |
+74:32:43.5 |
HIP 53656 |
12.06 |
| 2026-10-10 12:00 |
11:01:10.39 |
+74:32:55.1 |
HIP 53656 |
12.25 |
| 2026-10-11 00:00 |
11:01:16.00 |
+74:33:07.0 |
HIP 53656 |
12.45 |