メタデータ
| 項目 |
値 |
| Designation |
C/2008 J5 (Garradd) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-04-01T01:47:02.302080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:19Z |
| Obs used |
128 |
| NEO |
- |
| M1 |
10.600 |
| K1 |
17.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2008-06-25.0000000 |
| e |
0.97288948 |
| q (au) |
1.963842 |
| a (au) |
72.438378 |
| i (deg) |
93.270724 |
| Ω (om, deg) |
287.075696 |
| ω (w, deg) |
313.376402 |
| M (ma, deg) |
0.135766 |
等級
散乱 + 全体線形
$$
M_a = (10.954 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.954 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.798 |
| k |
0.998 |
| 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) |
| 2026-03-26 00:00 |
14:36:31.39 |
+81:04:20.2 |
HIP 70857 |
23.07 |
| 2026-03-26 12:00 |
14:36:13.34 |
+81:04:50.8 |
HIP 70857 |
22.91 |
| 2026-03-27 00:00 |
14:35:55.15 |
+81:05:21.0 |
HIP 70857 |
22.77 |
| 2026-03-27 12:00 |
14:35:36.83 |
+81:05:50.7 |
HIP 70857 |
22.66 |
| 2026-03-28 00:00 |
14:35:18.37 |
+81:06:20.0 |
HIP 70857 |
22.57 |
| 2026-03-28 12:00 |
14:34:59.79 |
+81:06:48.9 |
HIP 70959 |
22.38 |
| 2026-03-29 00:00 |
14:34:41.08 |
+81:07:17.3 |
HIP 70959 |
21.66 |
| 2026-03-29 12:00 |
14:34:22.24 |
+81:07:45.3 |
HIP 70959 |
20.95 |
| 2026-03-30 00:00 |
14:34:03.27 |
+81:08:12.8 |
HIP 70959 |
20.26 |
| 2026-03-30 12:00 |
14:33:44.18 |
+81:08:39.9 |
HIP 70959 |
19.58 |
| 2026-03-31 00:00 |
14:33:24.98 |
+81:09:06.5 |
HIP 70959 |
18.93 |
| 2026-03-31 12:00 |
14:33:05.65 |
+81:09:32.7 |
HIP 70959 |
18.30 |
| 2026-04-01 00:00 |
14:32:46.20 |
+81:09:58.4 |
HIP 70959 |
17.69 |
| 2026-04-01 12:00 |
14:32:26.64 |
+81:10:23.7 |
HIP 70959 |
17.11 |
| 2026-04-02 00:00 |
14:32:06.96 |
+81:10:48.5 |
HIP 70959 |
16.56 |
| 2026-04-02 12:00 |
14:31:47.17 |
+81:11:12.8 |
HIP 70959 |
16.05 |
| 2026-04-03 00:00 |
14:31:27.28 |
+81:11:36.7 |
HIP 70959 |
15.57 |
| 2026-04-03 12:00 |
14:31:07.27 |
+81:12:00.1 |
HIP 70959 |
15.13 |
| 2026-04-04 00:00 |
14:30:47.16 |
+81:12:23.0 |
HIP 70959 |
14.74 |
| 2026-04-04 12:00 |
14:30:26.94 |
+81:12:45.5 |
HIP 70959 |
14.39 |
| 2026-04-05 00:00 |
14:30:06.62 |
+81:13:07.5 |
HIP 70959 |
14.10 |
| 2026-04-05 12:00 |
14:29:46.20 |
+81:13:29.0 |
HIP 70959 |
13.86 |
| 2026-04-06 00:00 |
14:29:25.68 |
+81:13:50.0 |
HIP 70959 |
13.67 |
| 2026-04-06 12:00 |
14:29:05.07 |
+81:14:10.6 |
HIP 70959 |
13.55 |
| 2026-04-07 00:00 |
14:28:44.36 |
+81:14:30.7 |
HIP 70959 |
13.48 |
| 2026-04-07 12:00 |
14:28:23.56 |
+81:14:50.3 |
HIP 70959 |
13.48 |
| 2026-04-08 00:00 |
14:28:02.67 |
+81:15:09.4 |
HIP 70959 |
13.54 |
| 2026-04-08 12:00 |
14:27:41.70 |
+81:15:28.0 |
HIP 70959 |
13.66 |
| 2026-04-09 00:00 |
14:27:20.63 |
+81:15:46.1 |
HIP 70959 |
13.84 |
| 2026-04-09 12:00 |
14:26:59.49 |
+81:16:03.7 |
HIP 70959 |
14.07 |
| 2026-04-10 00:00 |
14:26:38.26 |
+81:16:20.9 |
HIP 70959 |
14.36 |
| 2026-04-10 12:00 |
14:26:16.96 |
+81:16:37.5 |
HIP 70959 |
14.70 |
| 2026-04-11 00:00 |
14:25:55.58 |
+81:16:53.6 |
HIP 70959 |
15.09 |
| 2026-04-11 12:00 |
14:25:34.13 |
+81:17:09.3 |
HIP 70959 |
15.52 |
| 2026-04-12 00:00 |
14:25:12.60 |
+81:17:24.4 |
HIP 70959 |
15.99 |
| 2026-04-12 12:00 |
14:24:51.01 |
+81:17:39.1 |
HIP 70959 |
16.50 |
| 2026-04-13 00:00 |
14:24:29.35 |
+81:17:53.2 |
HIP 70959 |
17.04 |
| 2026-04-13 12:00 |
14:24:07.62 |
+81:18:06.8 |
HIP 70959 |
17.61 |
| 2026-04-14 00:00 |
14:23:45.84 |
+81:18:20.0 |
HIP 70959 |
18.20 |
| 2026-04-14 12:00 |
14:23:23.99 |
+81:18:32.6 |
HIP 70959 |
18.82 |
| 2026-04-15 00:00 |
14:23:02.09 |
+81:18:44.7 |
HIP 70959 |
19.47 |
| 2026-04-15 12:00 |
14:22:40.13 |
+81:18:56.3 |
HIP 70959 |
20.13 |
| 2026-04-16 00:00 |
14:22:18.13 |
+81:19:07.4 |
HIP 70959 |
20.81 |