メタデータ
| 項目 |
値 |
| Designation |
C/2008 H1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-03-16T10:10:14.488320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:18Z |
| Obs used |
252 |
| NEO |
- |
| M1 |
13.300 |
| 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) |
2008-05-16.0000000 |
| e |
0.94658786 |
| q (au) |
2.760294 |
| a (au) |
51.679144 |
| i (deg) |
75.492175 |
| Ω (om, deg) |
34.630430 |
| ω (w, deg) |
96.043511 |
| M (ma, deg) |
0.160706 |
等級
散乱 + 全体線形
$$
M_a = (12.423 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.423 |
| n |
2.000 |
| gf |
0.950 |
| gb |
-0.999 |
| k |
1.000 |
| δ90 |
9.995 |
| 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 |
11:42:43.65 |
-79:07:40.4 |
HIP 57137 |
10.72 |
| 2026-07-29 12:00 |
11:42:54.08 |
-79:07:06.3 |
HIP 57137 |
11.28 |
| 2026-07-30 00:00 |
11:43:04.59 |
-79:06:32.6 |
HIP 57137 |
11.85 |
| 2026-07-30 12:00 |
11:43:15.20 |
-79:05:59.2 |
HIP 57137 |
12.43 |
| 2026-07-31 00:00 |
11:43:25.88 |
-79:05:26.0 |
HIP 57137 |
13.03 |
| 2026-07-31 12:00 |
11:43:36.66 |
-79:04:53.2 |
HIP 57137 |
13.64 |
| 2026-08-01 00:00 |
11:43:47.52 |
-79:04:20.6 |
HIP 57137 |
14.26 |
| 2026-08-01 12:00 |
11:43:58.46 |
-79:03:48.4 |
HIP 57137 |
14.88 |
| 2026-08-02 00:00 |
11:44:09.49 |
-79:03:16.4 |
HIP 57137 |
15.51 |
| 2026-08-02 12:00 |
11:44:20.60 |
-79:02:44.8 |
HIP 57137 |
16.15 |
| 2026-08-03 00:00 |
11:44:31.79 |
-79:02:13.5 |
HIP 57137 |
16.79 |
| 2026-08-03 12:00 |
11:44:43.06 |
-79:01:42.5 |
HIP 57137 |
17.44 |
| 2026-08-04 00:00 |
11:44:54.42 |
-79:01:11.8 |
HIP 57137 |
18.09 |
| 2026-08-04 12:00 |
11:45:05.85 |
-79:00:41.4 |
HIP 57137 |
18.74 |
| 2026-08-05 00:00 |
11:45:17.36 |
-79:00:11.3 |
HIP 57137 |
19.39 |
| 2026-08-05 12:00 |
11:45:28.96 |
-78:59:41.5 |
HIP 57137 |
20.05 |
| 2026-08-06 00:00 |
11:45:40.62 |
-78:59:12.1 |
HIP 57137 |
20.71 |
| 2026-08-06 12:00 |
11:45:52.37 |
-78:58:43.0 |
HIP 57137 |
21.37 |
| 2026-08-07 00:00 |
11:46:04.19 |
-78:58:14.2 |
HIP 57325 |
21.40 |
| 2026-08-07 12:00 |
11:46:16.09 |
-78:57:45.7 |
HIP 57325 |
21.00 |
| 2026-08-08 00:00 |
11:46:28.07 |
-78:57:17.6 |
HIP 57325 |
20.63 |
| 2026-08-08 12:00 |
11:46:40.11 |
-78:56:49.7 |
HIP 57325 |
20.29 |
| 2026-08-09 00:00 |
11:46:52.23 |
-78:56:22.3 |
HIP 57325 |
19.97 |
| 2026-08-09 12:00 |
11:47:04.43 |
-78:55:55.1 |
HIP 57325 |
19.69 |
| 2026-08-10 00:00 |
11:47:16.69 |
-78:55:28.3 |
HIP 57325 |
19.44 |
| 2026-08-10 12:00 |
11:47:29.03 |
-78:55:01.8 |
HIP 57325 |
19.21 |
| 2026-08-11 00:00 |
11:47:41.44 |
-78:54:35.6 |
HIP 57325 |
19.03 |
| 2026-08-11 12:00 |
11:47:53.91 |
-78:54:09.8 |
HIP 57325 |
18.87 |
| 2026-08-12 00:00 |
11:48:06.46 |
-78:53:44.4 |
HIP 57325 |
18.75 |
| 2026-08-12 12:00 |
11:48:19.07 |
-78:53:19.2 |
HIP 57325 |
18.67 |
| 2026-08-13 00:00 |
11:48:31.75 |
-78:52:54.5 |
HIP 57325 |
18.63 |
| 2026-08-13 12:00 |
11:48:44.50 |
-78:52:30.0 |
HIP 57325 |
18.62 |
| 2026-08-14 00:00 |
11:48:57.31 |
-78:52:05.9 |
HIP 57325 |
18.64 |
| 2026-08-14 12:00 |
11:49:10.18 |
-78:51:42.2 |
HIP 57325 |
18.71 |
| 2026-08-15 00:00 |
11:49:23.12 |
-78:51:18.8 |
HIP 57325 |
18.81 |
| 2026-08-15 12:00 |
11:49:36.12 |
-78:50:55.8 |
HIP 57325 |
18.94 |
| 2026-08-16 00:00 |
11:49:49.19 |
-78:50:33.1 |
HIP 57325 |
19.11 |
| 2026-08-16 12:00 |
11:50:02.31 |
-78:50:10.7 |
HIP 57325 |
19.31 |
| 2026-08-17 00:00 |
11:50:15.50 |
-78:49:48.8 |
HIP 57325 |
19.55 |
| 2026-08-17 12:00 |
11:50:28.74 |
-78:49:27.1 |
HIP 57325 |
19.82 |
| 2026-08-18 00:00 |
11:50:42.04 |
-78:49:05.9 |
HIP 57325 |
20.11 |
| 2026-08-18 12:00 |
11:50:55.40 |
-78:48:45.0 |
HIP 57325 |
20.44 |
| 2026-08-19 00:00 |
11:51:08.82 |
-78:48:24.4 |
HIP 57325 |
20.79 |