メタデータ
| 項目 |
値 |
| Designation |
C/2009 UG89 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-12-16T06:17:33.682560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:37Z |
| Obs used |
966 |
| NEO |
- |
| M1 |
5.200 |
| K1 |
15.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2010-10-30.0000000 |
| e |
1.00795978 |
| q (au) |
3.931171 |
| a (au) |
-493.879168 |
| i (deg) |
130.099828 |
| Ω (om, deg) |
321.007061 |
| ω (w, deg) |
60.651338 |
| M (ma, deg) |
-0.004244 |
等級
散乱 + 全体線形
$$
M_a = (10.775 + 2.529\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.775 |
| n |
2.529 |
| gf |
0.926 |
| gb |
-1.000 |
| k |
0.994 |
| δ90 |
9.428 |
| 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 |
08:23:33.56 |
+04:52:32.9 |
HIP 41032 |
18.55 |
| 2026-06-01 12:00 |
08:23:35.40 |
+04:52:33.7 |
HIP 41032 |
18.96 |
| 2026-06-02 00:00 |
08:23:37.27 |
+04:52:34.4 |
HIP 41032 |
19.37 |
| 2026-06-02 12:00 |
08:23:39.16 |
+04:52:34.9 |
HIP 41032 |
19.79 |
| 2026-06-03 00:00 |
08:23:41.08 |
+04:52:35.2 |
HIP 41032 |
20.22 |
| 2026-06-03 12:00 |
08:23:43.01 |
+04:52:35.4 |
HIP 41032 |
20.66 |
| 2026-06-04 00:00 |
08:23:44.97 |
+04:52:35.5 |
HIP 41032 |
21.11 |
| 2026-06-04 12:00 |
08:23:46.95 |
+04:52:35.3 |
HIP 41032 |
21.56 |
| 2026-06-05 00:00 |
08:23:48.96 |
+04:52:35.1 |
HIP 41032 |
22.02 |
| 2026-06-05 12:00 |
08:23:50.98 |
+04:52:34.7 |
HIP 41032 |
22.49 |
| 2026-06-06 00:00 |
08:23:53.03 |
+04:52:34.1 |
HIP 41032 |
22.97 |
| 2026-06-06 12:00 |
08:23:55.10 |
+04:52:33.4 |
HIP 41032 |
23.46 |
| 2026-06-07 00:00 |
08:23:57.18 |
+04:52:32.5 |
HIP 41032 |
23.95 |
| 2026-06-07 12:00 |
08:23:59.29 |
+04:52:31.4 |
HIP 41032 |
24.45 |
| 2026-06-08 00:00 |
08:24:01.43 |
+04:52:30.2 |
HIP 41032 |
24.95 |
| 2026-06-08 12:00 |
08:24:03.58 |
+04:52:28.9 |
HIP 41032 |
25.46 |
| 2026-06-09 00:00 |
08:24:05.75 |
+04:52:27.4 |
HIP 41032 |
25.98 |
| 2026-06-09 12:00 |
08:24:07.94 |
+04:52:25.8 |
HIP 41032 |
26.51 |
| 2026-06-10 00:00 |
08:24:10.16 |
+04:52:24.0 |
HIP 41032 |
27.04 |
| 2026-06-10 12:00 |
08:24:12.39 |
+04:52:22.0 |
HIP 41032 |
27.58 |
| 2026-06-11 00:00 |
08:24:14.64 |
+04:52:19.9 |
HIP 41032 |
28.12 |
| 2026-06-11 12:00 |
08:24:16.91 |
+04:52:17.6 |
HIP 41032 |
28.67 |
| 2026-06-12 00:00 |
08:24:19.21 |
+04:52:15.2 |
HIP 41032 |
29.23 |
| 2026-06-12 12:00 |
08:24:21.52 |
+04:52:12.6 |
HIP 41032 |
29.79 |
| 2026-06-13 00:00 |
08:24:23.85 |
+04:52:09.9 |
HIP 41240 |
29.80 |
| 2026-06-13 12:00 |
08:24:26.20 |
+04:52:07.0 |
HIP 41240 |
29.71 |
| 2026-06-14 00:00 |
08:24:28.57 |
+04:52:04.0 |
HIP 41240 |
29.63 |
| 2026-06-14 12:00 |
08:24:30.95 |
+04:52:00.8 |
HIP 41240 |
29.56 |
| 2026-06-15 00:00 |
08:24:33.36 |
+04:51:57.4 |
HIP 41240 |
29.51 |
| 2026-06-15 12:00 |
08:24:35.78 |
+04:51:53.9 |
HIP 41240 |
29.47 |
| 2026-06-16 00:00 |
08:24:38.22 |
+04:51:50.3 |
HIP 41240 |
29.45 |
| 2026-06-16 12:00 |
08:24:40.68 |
+04:51:46.5 |
HIP 41240 |
29.44 |
| 2026-06-17 00:00 |
08:24:43.16 |
+04:51:42.5 |
HIP 41240 |
29.44 |
| 2026-06-17 12:00 |
08:24:45.65 |
+04:51:38.4 |
HIP 41240 |
29.46 |
| 2026-06-18 00:00 |
08:24:48.16 |
+04:51:34.1 |
HIP 41240 |
29.50 |
| 2026-06-18 12:00 |
08:24:50.69 |
+04:51:29.7 |
HIP 41240 |
29.55 |
| 2026-06-19 00:00 |
08:24:53.24 |
+04:51:25.1 |
HIP 41240 |
29.62 |
| 2026-06-19 12:00 |
08:24:55.80 |
+04:51:20.4 |
HIP 41240 |
29.71 |
| 2026-06-20 00:00 |
08:24:58.37 |
+04:51:15.5 |
HIP 41240 |
29.81 |
| 2026-06-20 12:00 |
08:25:00.97 |
+04:51:10.5 |
HIP 41240 |
29.92 |
| 2026-06-21 00:00 |
08:25:03.58 |
+04:51:05.3 |
HIP 41240 |
30.06 |
| 2026-06-21 12:00 |
08:25:06.20 |
+04:51:00.0 |
HIP 41240 |
30.21 |
| 2026-06-22 00:00 |
08:25:08.84 |
+04:50:54.5 |
HIP 41240 |
30.38 |