メタデータ
| 項目 |
値 |
| Designation |
C/2008 G1 (Gibbs) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-01-11T23:47:18.816000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:17Z |
| Obs used |
166 |
| NEO |
- |
| M1 |
13.400 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2008-05-08.0000000 |
| e |
0.98907227 |
| q (au) |
3.989818 |
| a (au) |
365.109434 |
| i (deg) |
72.856095 |
| Ω (om, deg) |
215.916428 |
| ω (w, deg) |
63.704008 |
| M (ma, deg) |
359.964823 |
等級
散乱 + 全体線形
$$
M_a = (5.575 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.575 |
| n |
6.000 |
| gf |
0.982 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.917 |
| 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) |
| 2026-07-29 00:00 |
03:18:38.61 |
-06:01:08.5 |
HIP 15344 |
13.16 |
| 2026-07-29 12:00 |
03:18:39.67 |
-06:01:29.1 |
HIP 15344 |
13.55 |
| 2026-07-30 00:00 |
03:18:40.70 |
-06:01:49.9 |
HIP 15344 |
13.95 |
| 2026-07-30 12:00 |
03:18:41.71 |
-06:02:10.9 |
HIP 15480 |
13.81 |
| 2026-07-31 00:00 |
03:18:42.69 |
-06:02:32.0 |
HIP 15480 |
13.68 |
| 2026-07-31 12:00 |
03:18:43.64 |
-06:02:53.3 |
HIP 15480 |
13.57 |
| 2026-08-01 00:00 |
03:18:44.57 |
-06:03:14.7 |
HIP 15480 |
13.48 |
| 2026-08-01 12:00 |
03:18:45.47 |
-06:03:36.2 |
HIP 15480 |
13.41 |
| 2026-08-02 00:00 |
03:18:46.34 |
-06:03:57.9 |
HIP 15480 |
13.36 |
| 2026-08-02 12:00 |
03:18:47.19 |
-06:04:19.8 |
HIP 15480 |
13.33 |
| 2026-08-03 00:00 |
03:18:48.01 |
-06:04:41.8 |
HIP 15480 |
13.32 |
| 2026-08-03 12:00 |
03:18:48.80 |
-06:05:03.9 |
HIP 15480 |
13.33 |
| 2026-08-04 00:00 |
03:18:49.56 |
-06:05:26.2 |
HIP 15480 |
13.36 |
| 2026-08-04 12:00 |
03:18:50.30 |
-06:05:48.7 |
HIP 15480 |
13.41 |
| 2026-08-05 00:00 |
03:18:51.01 |
-06:06:11.2 |
HIP 15480 |
13.48 |
| 2026-08-05 12:00 |
03:18:51.69 |
-06:06:33.9 |
HIP 15480 |
13.56 |
| 2026-08-06 00:00 |
03:18:52.34 |
-06:06:56.8 |
HIP 15480 |
13.67 |
| 2026-08-06 12:00 |
03:18:52.97 |
-06:07:19.8 |
HIP 15480 |
13.80 |
| 2026-08-07 00:00 |
03:18:53.57 |
-06:07:42.9 |
HIP 15480 |
13.94 |
| 2026-08-07 12:00 |
03:18:54.14 |
-06:08:06.2 |
HIP 15480 |
14.10 |
| 2026-08-08 00:00 |
03:18:54.68 |
-06:08:29.6 |
HIP 15480 |
14.28 |
| 2026-08-08 12:00 |
03:18:55.19 |
-06:08:53.1 |
HIP 15480 |
14.47 |
| 2026-08-09 00:00 |
03:18:55.68 |
-06:09:16.8 |
HIP 15480 |
14.68 |
| 2026-08-09 12:00 |
03:18:56.14 |
-06:09:40.6 |
HIP 15480 |
14.91 |
| 2026-08-10 00:00 |
03:18:56.57 |
-06:10:04.5 |
HIP 15480 |
15.14 |
| 2026-08-10 12:00 |
03:18:56.97 |
-06:10:28.5 |
HIP 15480 |
15.40 |
| 2026-08-11 00:00 |
03:18:57.34 |
-06:10:52.7 |
HIP 15480 |
15.66 |
| 2026-08-11 12:00 |
03:18:57.69 |
-06:11:17.0 |
HIP 15480 |
15.94 |
| 2026-08-12 00:00 |
03:18:58.00 |
-06:11:41.4 |
HIP 15480 |
16.22 |
| 2026-08-12 12:00 |
03:18:58.29 |
-06:12:06.0 |
HIP 15480 |
16.52 |
| 2026-08-13 00:00 |
03:18:58.55 |
-06:12:30.7 |
HIP 15480 |
16.83 |
| 2026-08-13 12:00 |
03:18:58.78 |
-06:12:55.4 |
HIP 15480 |
17.15 |
| 2026-08-14 00:00 |
03:18:58.99 |
-06:13:20.3 |
HIP 15480 |
17.48 |
| 2026-08-14 12:00 |
03:18:59.16 |
-06:13:45.4 |
HIP 15480 |
17.82 |
| 2026-08-15 00:00 |
03:18:59.31 |
-06:14:10.5 |
HIP 15480 |
18.16 |
| 2026-08-15 12:00 |
03:18:59.42 |
-06:14:35.7 |
HIP 15480 |
18.52 |
| 2026-08-16 00:00 |
03:18:59.51 |
-06:15:01.1 |
HIP 15480 |
18.88 |
| 2026-08-16 12:00 |
03:18:59.57 |
-06:15:26.6 |
HIP 15480 |
19.25 |
| 2026-08-17 00:00 |
03:18:59.60 |
-06:15:52.1 |
HIP 15480 |
19.62 |
| 2026-08-17 12:00 |
03:18:59.60 |
-06:16:17.8 |
HIP 15480 |
20.01 |
| 2026-08-18 00:00 |
03:18:59.58 |
-06:16:43.6 |
HIP 15480 |
20.39 |
| 2026-08-18 12:00 |
03:18:59.52 |
-06:17:09.5 |
HIP 15480 |
20.79 |
| 2026-08-19 00:00 |
03:18:59.44 |
-06:17:35.5 |
HIP 15480 |
21.19 |