メタデータ
| 項目 |
値 |
| Designation |
C/2009 U1 (Garradd) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-10-07T22:02:42.892800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:36Z |
| Obs used |
10 |
| NEO |
- |
| M1 |
7.800 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-10-19.0000000 |
| e |
1.01500924 |
| q (au) |
5.382605 |
| a (au) |
-358.619493 |
| i (deg) |
91.236070 |
| Ω (om, deg) |
43.385462 |
| ω (w, deg) |
269.043011 |
| M (ma, deg) |
0.054580 |
等級
散乱 + 全体線形
$$
M_a = (9.041 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.041 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.942 |
| k |
0.803 |
| δ90 |
5.940 |
| 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 |
01:27:23.25 |
+53:16:29.6 |
HIP 6725 |
11.56 |
| 2026-06-01 12:00 |
01:27:26.57 |
+53:17:08.7 |
HIP 6725 |
12.38 |
| 2026-06-02 00:00 |
01:27:29.86 |
+53:17:48.0 |
HIP 6725 |
13.20 |
| 2026-06-02 12:00 |
01:27:33.12 |
+53:18:27.4 |
HIP 6725 |
14.01 |
| 2026-06-03 00:00 |
01:27:36.34 |
+53:19:06.9 |
HIP 6725 |
14.83 |
| 2026-06-03 12:00 |
01:27:39.54 |
+53:19:46.5 |
HIP 6725 |
15.64 |
| 2026-06-04 00:00 |
01:27:42.71 |
+53:20:26.3 |
HIP 6725 |
16.45 |
| 2026-06-04 12:00 |
01:27:45.84 |
+53:21:06.1 |
HIP 6725 |
17.26 |
| 2026-06-05 00:00 |
01:27:48.94 |
+53:21:46.0 |
HIP 6725 |
18.07 |
| 2026-06-05 12:00 |
01:27:52.01 |
+53:22:26.1 |
HIP 6725 |
18.87 |
| 2026-06-06 00:00 |
01:27:55.05 |
+53:23:06.2 |
HIP 6986 |
19.25 |
| 2026-06-06 12:00 |
01:27:58.05 |
+53:23:46.5 |
HIP 6986 |
18.59 |
| 2026-06-07 00:00 |
01:28:01.02 |
+53:24:26.8 |
HIP 6986 |
17.95 |
| 2026-06-07 12:00 |
01:28:03.96 |
+53:25:07.2 |
HIP 6986 |
17.32 |
| 2026-06-08 00:00 |
01:28:06.87 |
+53:25:47.7 |
HIP 6986 |
16.72 |
| 2026-06-08 12:00 |
01:28:09.74 |
+53:26:28.4 |
HIP 6986 |
16.14 |
| 2026-06-09 00:00 |
01:28:12.57 |
+53:27:09.1 |
HIP 6986 |
15.58 |
| 2026-06-09 12:00 |
01:28:15.38 |
+53:27:49.8 |
HIP 6986 |
15.05 |
| 2026-06-10 00:00 |
01:28:18.15 |
+53:28:30.7 |
HIP 6986 |
14.55 |
| 2026-06-10 12:00 |
01:28:20.88 |
+53:29:11.7 |
HIP 6986 |
14.08 |
| 2026-06-11 00:00 |
01:28:23.58 |
+53:29:52.7 |
HIP 6986 |
13.64 |
| 2026-06-11 12:00 |
01:28:26.24 |
+53:30:33.8 |
HIP 6986 |
13.25 |
| 2026-06-12 00:00 |
01:28:28.87 |
+53:31:15.0 |
HIP 6986 |
12.90 |
| 2026-06-12 12:00 |
01:28:31.46 |
+53:31:56.2 |
HIP 6986 |
12.59 |
| 2026-06-13 00:00 |
01:28:34.02 |
+53:32:37.5 |
HIP 6986 |
12.33 |
| 2026-06-13 12:00 |
01:28:36.54 |
+53:33:18.9 |
HIP 6986 |
12.13 |
| 2026-06-14 00:00 |
01:28:39.02 |
+53:34:00.4 |
HIP 6986 |
11.97 |
| 2026-06-14 12:00 |
01:28:41.47 |
+53:34:41.9 |
HIP 6986 |
11.87 |
| 2026-06-15 00:00 |
01:28:43.88 |
+53:35:23.5 |
HIP 6986 |
11.83 |
| 2026-06-15 12:00 |
01:28:46.25 |
+53:36:05.1 |
HIP 6986 |
11.85 |
| 2026-06-16 00:00 |
01:28:48.59 |
+53:36:46.8 |
HIP 6986 |
11.92 |
| 2026-06-16 12:00 |
01:28:50.88 |
+53:37:28.5 |
HIP 6986 |
12.05 |
| 2026-06-17 00:00 |
01:28:53.14 |
+53:38:10.3 |
HIP 6986 |
12.23 |
| 2026-06-17 12:00 |
01:28:55.36 |
+53:38:52.1 |
HIP 6986 |
12.45 |
| 2026-06-18 00:00 |
01:28:57.55 |
+53:39:34.0 |
HIP 6986 |
12.73 |
| 2026-06-18 12:00 |
01:28:59.69 |
+53:40:15.9 |
HIP 6986 |
13.05 |
| 2026-06-19 00:00 |
01:29:01.80 |
+53:40:57.8 |
HIP 6986 |
13.41 |
| 2026-06-19 12:00 |
01:29:03.86 |
+53:41:39.8 |
HIP 6986 |
13.81 |
| 2026-06-20 00:00 |
01:29:05.89 |
+53:42:21.9 |
HIP 6986 |
14.24 |
| 2026-06-20 12:00 |
01:29:07.88 |
+53:43:03.9 |
HIP 6986 |
14.70 |
| 2026-06-21 00:00 |
01:29:09.83 |
+53:43:46.0 |
HIP 6986 |
15.19 |
| 2026-06-21 12:00 |
01:29:11.74 |
+53:44:28.1 |
HIP 6986 |
15.70 |
| 2026-06-22 00:00 |
01:29:13.61 |
+53:45:10.2 |
HIP 6986 |
16.24 |