C/2008 E3 (Garradd)
メタデータ
| 項目 |
値 |
| Designation |
C/2008 E3 (Garradd) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-08-02T05:22:47.424000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:17Z |
| Obs used |
109 |
| NEO |
- |
| M1 |
6.600 |
| 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) |
2008-08-09.0000000 |
| e |
0.99849003 |
| q (au) |
5.531015 |
| a (au) |
3662.996730 |
| i (deg) |
105.076501 |
| Ω (om, deg) |
105.674911 |
| ω (w, deg) |
218.094534 |
| M (ma, deg) |
0.000030 |
等級
散乱 + 全体線形
$$
M_a = (2.326 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
2.326 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-02-03 00:00 |
07:10:50.84 |
+12:33:05.6 |
HIP 34604 |
11.35 |
| 2026-02-03 12:00 |
07:10:47.45 |
+12:33:21.4 |
HIP 34604 |
10.53 |
| 2026-02-04 00:00 |
07:10:44.06 |
+12:33:37.2 |
HIP 34604 |
9.72 |
| 2026-02-04 12:00 |
07:10:40.70 |
+12:33:53.0 |
HIP 34604 |
8.93 |
| 2026-02-05 00:00 |
07:10:37.35 |
+12:34:08.9 |
HIP 34604 |
8.15 |
| 2026-02-05 12:00 |
07:10:34.02 |
+12:34:24.8 |
HIP 34604 |
7.40 |
| 2026-02-06 00:00 |
07:10:30.70 |
+12:34:40.7 |
HIP 34604 |
6.68 |
| 2026-02-06 12:00 |
07:10:27.41 |
+12:34:56.7 |
HIP 34604 |
5.99 |
| 2026-02-07 00:00 |
07:10:24.13 |
+12:35:12.7 |
HIP 34604 |
5.36 |
| 2026-02-07 12:00 |
07:10:20.87 |
+12:35:28.8 |
HIP 34604 |
4.80 |
| 2026-02-08 00:00 |
07:10:17.63 |
+12:35:44.8 |
HIP 34604 |
4.32 |
| 2026-02-08 12:00 |
07:10:14.40 |
+12:36:00.9 |
HIP 34604 |
3.98 |
| 2026-02-09 00:00 |
07:10:11.20 |
+12:36:17.1 |
HIP 34604 |
3.79 |
| 2026-02-09 12:00 |
07:10:08.02 |
+12:36:33.2 |
HIP 34604 |
3.78 |
| 2026-02-10 00:00 |
07:10:04.85 |
+12:36:49.4 |
HIP 34604 |
3.94 |
| 2026-02-10 12:00 |
07:10:01.71 |
+12:37:05.7 |
HIP 34604 |
4.26 |
| 2026-02-11 00:00 |
07:09:58.58 |
+12:37:21.9 |
HIP 34604 |
4.69 |
| 2026-02-11 12:00 |
07:09:55.48 |
+12:37:38.2 |
HIP 34604 |
5.22 |
| 2026-02-12 00:00 |
07:09:52.39 |
+12:37:54.5 |
HIP 34604 |
5.81 |
| 2026-02-12 12:00 |
07:09:49.33 |
+12:38:10.8 |
HIP 34604 |
6.44 |
| 2026-02-13 00:00 |
07:09:46.28 |
+12:38:27.1 |
HIP 34604 |
7.10 |
| 2026-02-13 12:00 |
07:09:43.26 |
+12:38:43.5 |
HIP 34604 |
7.78 |
| 2026-02-14 00:00 |
07:09:40.26 |
+12:38:59.9 |
HIP 34604 |
8.48 |
| 2026-02-14 12:00 |
07:09:37.28 |
+12:39:16.3 |
HIP 34604 |
9.18 |
| 2026-02-15 00:00 |
07:09:34.33 |
+12:39:32.7 |
HIP 34604 |
9.90 |
| 2026-02-15 12:00 |
07:09:31.39 |
+12:39:49.1 |
HIP 34604 |
10.61 |
| 2026-02-16 00:00 |
07:09:28.48 |
+12:40:05.6 |
HIP 34604 |
11.33 |
| 2026-02-16 12:00 |
07:09:25.59 |
+12:40:22.1 |
HIP 34604 |
12.05 |
| 2026-02-17 00:00 |
07:09:22.73 |
+12:40:38.6 |
HIP 34604 |
12.78 |
| 2026-02-17 12:00 |
07:09:19.88 |
+12:40:55.1 |
HIP 34604 |
13.49 |
| 2026-02-18 00:00 |
07:09:17.06 |
+12:41:11.6 |
HIP 34604 |
14.21 |
| 2026-02-18 12:00 |
07:09:14.27 |
+12:41:28.1 |
HIP 34604 |
14.93 |
| 2026-02-19 00:00 |
07:09:11.50 |
+12:41:44.7 |
HIP 34604 |
15.64 |
| 2026-02-19 12:00 |
07:09:08.75 |
+12:42:01.2 |
HIP 34604 |
16.35 |
| 2026-02-20 00:00 |
07:09:06.02 |
+12:42:17.8 |
HIP 34604 |
17.06 |
| 2026-02-20 12:00 |
07:09:03.32 |
+12:42:34.3 |
HIP 34604 |
17.76 |
| 2026-02-21 00:00 |
07:09:00.65 |
+12:42:50.9 |
HIP 34604 |
18.46 |
| 2026-02-21 12:00 |
07:08:58.00 |
+12:43:07.5 |
HIP 34604 |
19.15 |
| 2026-02-22 00:00 |
07:08:55.38 |
+12:43:24.1 |
HIP 34604 |
19.84 |
| 2026-02-22 12:00 |
07:08:52.78 |
+12:43:40.7 |
HIP 34604 |
20.52 |
| 2026-02-23 00:00 |
07:08:50.20 |
+12:43:57.3 |
HIP 34604 |
21.20 |
| 2026-02-23 12:00 |
07:08:47.65 |
+12:44:13.9 |
HIP 34604 |
21.88 |
| 2026-02-24 00:00 |
07:08:45.13 |
+12:44:30.5 |
HIP 34604 |
22.55 |