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) |
| 2026-09-20 00:00 |
01:23:03.57 |
+55:18:11.7 |
HIP 6473 |
17.92 |
| 2026-09-20 12:00 |
01:22:58.09 |
+55:18:19.4 |
HIP 6473 |
17.89 |
| 2026-09-21 00:00 |
01:22:52.58 |
+55:18:26.8 |
HIP 6473 |
17.89 |
| 2026-09-21 12:00 |
01:22:47.05 |
+55:18:33.7 |
HIP 6473 |
17.93 |
| 2026-09-22 00:00 |
01:22:41.49 |
+55:18:40.4 |
HIP 6473 |
18.02 |
| 2026-09-22 12:00 |
01:22:35.92 |
+55:18:46.6 |
HIP 6473 |
18.15 |
| 2026-09-23 00:00 |
01:22:30.33 |
+55:18:52.5 |
HIP 6473 |
18.32 |
| 2026-09-23 12:00 |
01:22:24.72 |
+55:18:58.1 |
HIP 6473 |
18.52 |
| 2026-09-24 00:00 |
01:22:19.09 |
+55:19:03.3 |
HIP 6473 |
18.77 |
| 2026-09-24 12:00 |
01:22:13.44 |
+55:19:08.1 |
HIP 6473 |
19.05 |
| 2026-09-25 00:00 |
01:22:07.77 |
+55:19:12.6 |
HIP 6473 |
19.37 |
| 2026-09-25 12:00 |
01:22:02.08 |
+55:19:16.7 |
HIP 6473 |
19.73 |
| 2026-09-26 00:00 |
01:21:56.37 |
+55:19:20.4 |
HIP 6473 |
20.11 |
| 2026-09-26 12:00 |
01:21:50.65 |
+55:19:23.8 |
HIP 6473 |
20.53 |
| 2026-09-27 00:00 |
01:21:44.91 |
+55:19:26.9 |
HIP 6473 |
20.98 |
| 2026-09-27 12:00 |
01:21:39.16 |
+55:19:29.5 |
HIP 6473 |
21.45 |
| 2026-09-28 00:00 |
01:21:33.39 |
+55:19:31.8 |
HIP 6473 |
21.95 |
| 2026-09-28 12:00 |
01:21:27.60 |
+55:19:33.8 |
HIP 6473 |
22.48 |
| 2026-09-29 00:00 |
01:21:21.80 |
+55:19:35.3 |
HIP 6285 |
22.75 |
| 2026-09-29 12:00 |
01:21:15.98 |
+55:19:36.6 |
HIP 6285 |
22.55 |
| 2026-09-30 00:00 |
01:21:10.15 |
+55:19:37.4 |
HIP 6285 |
22.38 |
| 2026-09-30 12:00 |
01:21:04.30 |
+55:19:37.9 |
HIP 6285 |
22.22 |
| 2026-10-01 00:00 |
01:20:58.45 |
+55:19:38.0 |
HIP 6153 |
22.04 |
| 2026-10-01 12:00 |
01:20:52.57 |
+55:19:37.8 |
HIP 6153 |
21.40 |
| 2026-10-02 00:00 |
01:20:46.69 |
+55:19:37.2 |
HIP 6153 |
20.77 |
| 2026-10-02 12:00 |
01:20:40.79 |
+55:19:36.2 |
HIP 6153 |
20.17 |
| 2026-10-03 00:00 |
01:20:34.89 |
+55:19:34.9 |
HIP 6153 |
19.58 |
| 2026-10-03 12:00 |
01:20:28.97 |
+55:19:33.2 |
HIP 6153 |
19.01 |
| 2026-10-04 00:00 |
01:20:23.04 |
+55:19:31.2 |
HIP 6153 |
18.47 |
| 2026-10-04 12:00 |
01:20:17.10 |
+55:19:28.7 |
HIP 6153 |
17.96 |
| 2026-10-05 00:00 |
01:20:11.15 |
+55:19:25.9 |
HIP 6153 |
17.48 |
| 2026-10-05 12:00 |
01:20:05.19 |
+55:19:22.8 |
HIP 6153 |
17.03 |
| 2026-10-06 00:00 |
01:19:59.22 |
+55:19:19.3 |
HIP 6153 |
16.61 |
| 2026-10-06 12:00 |
01:19:53.25 |
+55:19:15.4 |
HIP 6153 |
16.23 |
| 2026-10-07 00:00 |
01:19:47.26 |
+55:19:11.2 |
HIP 6153 |
15.90 |
| 2026-10-07 12:00 |
01:19:41.27 |
+55:19:06.5 |
HIP 6153 |
15.61 |
| 2026-10-08 00:00 |
01:19:35.27 |
+55:19:01.6 |
HIP 6153 |
15.36 |
| 2026-10-08 12:00 |
01:19:29.27 |
+55:18:56.2 |
HIP 6153 |
15.17 |
| 2026-10-09 00:00 |
01:19:23.26 |
+55:18:50.5 |
HIP 6153 |
15.03 |
| 2026-10-09 12:00 |
01:19:17.25 |
+55:18:44.5 |
HIP 6064 |
14.70 |
| 2026-10-10 00:00 |
01:19:11.23 |
+55:18:38.0 |
HIP 6064 |
14.05 |
| 2026-10-10 12:00 |
01:19:05.20 |
+55:18:31.3 |
HIP 6064 |
13.43 |
| 2026-10-11 00:00 |
01:18:59.18 |
+55:18:24.1 |
HIP 6064 |
12.84 |