C/2009 UG89 (Lemmon)
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
$$
M_a = (11.200 + 2.233\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.200 |
| n |
2.233 |
| gf |
0.980 |
| gb |
-0.900 |
| k |
0.992 |
| δ90 |
9.816 |
| 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 |
08:29:19.74 |
+04:03:18.0 |
HIP 41705 |
14.34 |
| 2026-02-03 12:00 |
08:29:15.63 |
+04:03:31.1 |
HIP 41705 |
15.32 |
| 2026-02-04 00:00 |
08:29:11.53 |
+04:03:44.4 |
HIP 41705 |
16.31 |
| 2026-02-04 12:00 |
08:29:07.43 |
+04:03:57.8 |
HIP 41705 |
17.30 |
| 2026-02-05 00:00 |
08:29:03.34 |
+04:04:11.3 |
HIP 41705 |
18.29 |
| 2026-02-05 12:00 |
08:28:59.26 |
+04:04:24.8 |
HIP 41705 |
19.29 |
| 2026-02-06 00:00 |
08:28:55.19 |
+04:04:38.5 |
HIP 41705 |
20.29 |
| 2026-02-06 12:00 |
08:28:51.12 |
+04:04:52.3 |
HIP 41705 |
21.29 |
| 2026-02-07 00:00 |
08:28:47.06 |
+04:05:06.2 |
HIP 41705 |
22.30 |
| 2026-02-07 12:00 |
08:28:43.01 |
+04:05:20.2 |
HIP 41705 |
23.30 |
| 2026-02-08 00:00 |
08:28:38.96 |
+04:05:34.3 |
HIP 41705 |
24.31 |
| 2026-02-08 12:00 |
08:28:34.93 |
+04:05:48.5 |
HIP 41705 |
25.31 |
| 2026-02-09 00:00 |
08:28:30.90 |
+04:06:02.8 |
HIP 41705 |
26.32 |
| 2026-02-09 12:00 |
08:28:26.89 |
+04:06:17.1 |
HIP 41705 |
27.32 |
| 2026-02-10 00:00 |
08:28:22.88 |
+04:06:31.6 |
HIP 41705 |
28.33 |
| 2026-02-10 12:00 |
08:28:18.89 |
+04:06:46.2 |
HIP 41705 |
29.33 |
| 2026-02-11 00:00 |
08:28:14.90 |
+04:07:00.8 |
HIP 41705 |
30.33 |
| 2026-02-11 12:00 |
08:28:10.93 |
+04:07:15.6 |
HIP 41705 |
31.33 |
| 2026-02-12 00:00 |
08:28:06.96 |
+04:07:30.4 |
HIP 41705 |
32.33 |
| 2026-02-12 12:00 |
08:28:03.01 |
+04:07:45.3 |
HIP 41705 |
33.33 |
| 2026-02-13 00:00 |
08:27:59.07 |
+04:08:00.3 |
HIP 41705 |
34.33 |
| 2026-02-13 12:00 |
08:27:55.15 |
+04:08:15.4 |
HIP 41705 |
35.32 |
| 2026-02-14 00:00 |
08:27:51.23 |
+04:08:30.5 |
HIP 41705 |
36.31 |
| 2026-02-14 12:00 |
08:27:47.33 |
+04:08:45.8 |
HIP 41705 |
37.30 |
| 2026-02-15 00:00 |
08:27:43.44 |
+04:09:01.1 |
HIP 41277 |
37.05 |
| 2026-02-15 12:00 |
08:27:39.56 |
+04:09:16.5 |
HIP 41277 |
36.05 |
| 2026-02-16 00:00 |
08:27:35.70 |
+04:09:31.9 |
HIP 41277 |
35.06 |
| 2026-02-16 12:00 |
08:27:31.85 |
+04:09:47.5 |
HIP 41277 |
34.07 |
| 2026-02-17 00:00 |
08:27:28.01 |
+04:10:03.1 |
HIP 41277 |
33.09 |
| 2026-02-17 12:00 |
08:27:24.19 |
+04:10:18.7 |
HIP 41277 |
32.11 |
| 2026-02-18 00:00 |
08:27:20.39 |
+04:10:34.5 |
HIP 41277 |
31.13 |
| 2026-02-18 12:00 |
08:27:16.60 |
+04:10:50.3 |
HIP 41277 |
30.15 |
| 2026-02-19 00:00 |
08:27:12.82 |
+04:11:06.2 |
HIP 41277 |
29.18 |
| 2026-02-19 12:00 |
08:27:09.06 |
+04:11:22.1 |
HIP 41277 |
28.22 |
| 2026-02-20 00:00 |
08:27:05.32 |
+04:11:38.1 |
HIP 41277 |
27.26 |
| 2026-02-20 12:00 |
08:27:01.59 |
+04:11:54.2 |
HIP 41277 |
26.30 |
| 2026-02-21 00:00 |
08:26:57.88 |
+04:12:10.3 |
HIP 41277 |
25.35 |
| 2026-02-21 12:00 |
08:26:54.19 |
+04:12:26.5 |
HIP 41277 |
24.41 |
| 2026-02-22 00:00 |
08:26:50.52 |
+04:12:42.7 |
HIP 41277 |
23.47 |
| 2026-02-22 12:00 |
08:26:46.86 |
+04:12:58.9 |
HIP 41277 |
22.53 |
| 2026-02-23 00:00 |
08:26:43.22 |
+04:13:15.3 |
HIP 41277 |
21.60 |
| 2026-02-23 12:00 |
08:26:39.59 |
+04:13:31.6 |
HIP 41277 |
20.68 |
| 2026-02-24 00:00 |
08:26:35.99 |
+04:13:48.1 |
HIP 41277 |
19.76 |