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
$$
M_a = (5.574 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.574 |
| n |
6.000 |
| gf |
0.995 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.994 |
| 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) |
| 2026-05-12 00:00 |
03:11:51.24 |
-05:45:18.6 |
HIP 14876 |
4.03 |
| 2026-05-12 12:00 |
03:11:54.69 |
-05:45:09.8 |
HIP 14876 |
3.36 |
| 2026-05-13 00:00 |
03:11:58.15 |
-05:45:01.2 |
HIP 14876 |
2.81 |
| 2026-05-13 12:00 |
03:12:01.60 |
-05:44:52.8 |
HIP 14876 |
2.46 |
| 2026-05-14 00:00 |
03:12:05.06 |
-05:44:44.5 |
HIP 14876 |
2.40 |
| 2026-05-14 12:00 |
03:12:08.51 |
-05:44:36.5 |
HIP 14876 |
2.64 |
| 2026-05-15 00:00 |
03:12:11.96 |
-05:44:28.6 |
HIP 14876 |
3.11 |
| 2026-05-15 12:00 |
03:12:15.41 |
-05:44:20.9 |
HIP 14876 |
3.73 |
| 2026-05-16 00:00 |
03:12:18.85 |
-05:44:13.3 |
HIP 14876 |
4.43 |
| 2026-05-16 12:00 |
03:12:22.30 |
-05:44:06.0 |
HIP 14876 |
5.19 |
| 2026-05-17 00:00 |
03:12:25.74 |
-05:43:58.8 |
HIP 14876 |
5.97 |
| 2026-05-17 12:00 |
03:12:29.18 |
-05:43:51.8 |
HIP 14876 |
6.78 |
| 2026-05-18 00:00 |
03:12:32.61 |
-05:43:45.0 |
HIP 14876 |
7.60 |
| 2026-05-18 12:00 |
03:12:36.05 |
-05:43:38.4 |
HIP 14876 |
8.42 |
| 2026-05-19 00:00 |
03:12:39.48 |
-05:43:31.9 |
HIP 14876 |
9.25 |
| 2026-05-19 12:00 |
03:12:42.90 |
-05:43:25.7 |
HIP 14876 |
10.09 |
| 2026-05-20 00:00 |
03:12:46.33 |
-05:43:19.6 |
HIP 14876 |
10.93 |
| 2026-05-20 12:00 |
03:12:49.74 |
-05:43:13.7 |
HIP 14876 |
11.77 |
| 2026-05-21 00:00 |
03:12:53.16 |
-05:43:08.0 |
HIP 14876 |
12.61 |
| 2026-05-21 12:00 |
03:12:56.57 |
-05:43:02.5 |
HIP 14876 |
13.45 |
| 2026-05-22 00:00 |
03:12:59.97 |
-05:42:57.2 |
HIP 14876 |
14.29 |
| 2026-05-22 12:00 |
03:13:03.37 |
-05:42:52.1 |
HIP 14876 |
15.14 |
| 2026-05-23 00:00 |
03:13:06.77 |
-05:42:47.1 |
HIP 14876 |
15.98 |
| 2026-05-23 12:00 |
03:13:10.16 |
-05:42:42.4 |
HIP 14876 |
16.82 |
| 2026-05-24 00:00 |
03:13:13.54 |
-05:42:37.8 |
HIP 14876 |
17.66 |
| 2026-05-24 12:00 |
03:13:16.92 |
-05:42:33.4 |
HIP 14876 |
18.50 |
| 2026-05-25 00:00 |
03:13:20.29 |
-05:42:29.2 |
HIP 14876 |
19.34 |
| 2026-05-25 12:00 |
03:13:23.66 |
-05:42:25.2 |
HIP 14876 |
20.18 |
| 2026-05-26 00:00 |
03:13:27.02 |
-05:42:21.4 |
HIP 14876 |
21.01 |
| 2026-05-26 12:00 |
03:13:30.37 |
-05:42:17.8 |
HIP 14876 |
21.85 |
| 2026-05-27 00:00 |
03:13:33.72 |
-05:42:14.4 |
HIP 14876 |
22.68 |
| 2026-05-27 12:00 |
03:13:37.06 |
-05:42:11.1 |
HIP 14876 |
23.51 |
| 2026-05-28 00:00 |
03:13:40.39 |
-05:42:08.1 |
HIP 14876 |
24.34 |
| 2026-05-28 12:00 |
03:13:43.71 |
-05:42:05.2 |
HIP 15128 |
24.72 |
| 2026-05-29 00:00 |
03:13:47.03 |
-05:42:02.6 |
HIP 15128 |
24.02 |
| 2026-05-29 12:00 |
03:13:50.34 |
-05:42:00.1 |
HIP 15128 |
23.32 |
| 2026-05-30 00:00 |
03:13:53.64 |
-05:41:57.9 |
HIP 15128 |
22.64 |
| 2026-05-30 12:00 |
03:13:56.94 |
-05:41:55.8 |
HIP 15128 |
21.98 |
| 2026-05-31 00:00 |
03:14:00.22 |
-05:41:53.9 |
HIP 15128 |
21.32 |
| 2026-05-31 12:00 |
03:14:03.50 |
-05:41:52.2 |
HIP 15128 |
20.69 |
| 2026-06-01 00:00 |
03:14:06.77 |
-05:41:50.7 |
HIP 15128 |
20.06 |
| 2026-06-01 12:00 |
03:14:10.03 |
-05:41:49.4 |
HIP 15128 |
19.46 |
| 2026-06-02 00:00 |
03:14:13.28 |
-05:41:48.3 |
HIP 15128 |
18.88 |