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) |
| 2026-07-29 00:00 |
10:45:40.08 |
+74:43:04.5 |
HIP 52618 |
8.98 |
| 2026-07-29 12:00 |
10:45:45.70 |
+74:42:45.9 |
HIP 52618 |
9.31 |
| 2026-07-30 00:00 |
10:45:51.34 |
+74:42:27.5 |
HIP 52618 |
9.65 |
| 2026-07-30 12:00 |
10:45:57.02 |
+74:42:09.3 |
HIP 52618 |
10.00 |
| 2026-07-31 00:00 |
10:46:02.72 |
+74:41:51.2 |
HIP 52618 |
10.36 |
| 2026-07-31 12:00 |
10:46:08.45 |
+74:41:33.3 |
HIP 52618 |
10.72 |
| 2026-08-01 00:00 |
10:46:14.20 |
+74:41:15.5 |
HIP 52783 |
10.78 |
| 2026-08-01 12:00 |
10:46:19.99 |
+74:40:58.0 |
HIP 52783 |
10.34 |
| 2026-08-02 00:00 |
10:46:25.79 |
+74:40:40.5 |
HIP 52783 |
9.92 |
| 2026-08-02 12:00 |
10:46:31.63 |
+74:40:23.3 |
HIP 52783 |
9.49 |
| 2026-08-03 00:00 |
10:46:37.49 |
+74:40:06.2 |
HIP 52783 |
9.08 |
| 2026-08-03 12:00 |
10:46:43.37 |
+74:39:49.3 |
HIP 52783 |
8.67 |
| 2026-08-04 00:00 |
10:46:49.28 |
+74:39:32.5 |
HIP 52783 |
8.28 |
| 2026-08-04 12:00 |
10:46:55.21 |
+74:39:15.9 |
HIP 52783 |
7.89 |
| 2026-08-05 00:00 |
10:47:01.17 |
+74:38:59.5 |
HIP 52783 |
7.52 |
| 2026-08-05 12:00 |
10:47:07.15 |
+74:38:43.3 |
HIP 52783 |
7.17 |
| 2026-08-06 00:00 |
10:47:13.16 |
+74:38:27.2 |
HIP 52783 |
6.83 |
| 2026-08-06 12:00 |
10:47:19.18 |
+74:38:11.3 |
HIP 52783 |
6.52 |
| 2026-08-07 00:00 |
10:47:25.23 |
+74:37:55.6 |
HIP 52783 |
6.23 |
| 2026-08-07 12:00 |
10:47:31.31 |
+74:37:40.1 |
HIP 52783 |
5.96 |
| 2026-08-08 00:00 |
10:47:37.40 |
+74:37:24.7 |
HIP 52783 |
5.73 |
| 2026-08-08 12:00 |
10:47:43.52 |
+74:37:09.5 |
HIP 52783 |
5.53 |
| 2026-08-09 00:00 |
10:47:49.66 |
+74:36:54.5 |
HIP 52783 |
5.37 |
| 2026-08-09 12:00 |
10:47:55.81 |
+74:36:39.7 |
HIP 52783 |
5.26 |
| 2026-08-10 00:00 |
10:48:01.99 |
+74:36:25.1 |
HIP 52783 |
5.18 |
| 2026-08-10 12:00 |
10:48:08.19 |
+74:36:10.6 |
HIP 52783 |
5.16 |
| 2026-08-11 00:00 |
10:48:14.41 |
+74:35:56.4 |
HIP 52783 |
5.18 |
| 2026-08-11 12:00 |
10:48:20.65 |
+74:35:42.3 |
HIP 52783 |
5.25 |
| 2026-08-12 00:00 |
10:48:26.90 |
+74:35:28.4 |
HIP 52783 |
5.37 |
| 2026-08-12 12:00 |
10:48:33.18 |
+74:35:14.7 |
HIP 52783 |
5.52 |
| 2026-08-13 00:00 |
10:48:39.47 |
+74:35:01.2 |
HIP 52783 |
5.72 |
| 2026-08-13 12:00 |
10:48:45.78 |
+74:34:47.9 |
HIP 52783 |
5.95 |
| 2026-08-14 00:00 |
10:48:52.11 |
+74:34:34.7 |
HIP 52783 |
6.21 |
| 2026-08-14 12:00 |
10:48:58.45 |
+74:34:21.8 |
HIP 52783 |
6.49 |
| 2026-08-15 00:00 |
10:49:04.81 |
+74:34:09.0 |
HIP 52783 |
6.80 |
| 2026-08-15 12:00 |
10:49:11.19 |
+74:33:56.5 |
HIP 52783 |
7.13 |
| 2026-08-16 00:00 |
10:49:17.58 |
+74:33:44.1 |
HIP 52783 |
7.48 |
| 2026-08-16 12:00 |
10:49:23.98 |
+74:33:32.0 |
HIP 52783 |
7.84 |
| 2026-08-17 00:00 |
10:49:30.40 |
+74:33:20.0 |
HIP 52783 |
8.22 |
| 2026-08-17 12:00 |
10:49:36.84 |
+74:33:08.2 |
HIP 52783 |
8.61 |
| 2026-08-18 00:00 |
10:49:43.29 |
+74:32:56.7 |
HIP 52783 |
9.00 |
| 2026-08-18 12:00 |
10:49:49.75 |
+74:32:45.3 |
HIP 52783 |
9.41 |
| 2026-08-19 00:00 |
10:49:56.22 |
+74:32:34.1 |
HIP 52783 |
9.82 |