メタデータ
| 項目 |
値 |
| Designation |
C/2003 A2 (Gleason) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-11-05T00:23:36.450240Z |
| Orbit solution date (soln_date, UTC) |
2025-07-31T12:12:22Z |
| Obs used |
165 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
7.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2003-08-08.0000000 |
| e |
1.00694108 |
| q (au) |
11.427006 |
| a (au) |
-1646.285863 |
| i (deg) |
8.061536 |
| Ω (om, deg) |
154.544669 |
| ω (w, deg) |
346.638010 |
| M (ma, deg) |
-0.001313 |
等級
散乱 + 全体線形
$$
M_a = (-2.177 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
-2.177 |
| n |
6.000 |
| gf |
0.900 |
| gb |
-0.974 |
| k |
1.000 |
| δ90 |
4.423 |
| 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 |
16:48:49.19 |
-14:16:15.6 |
HIP 82323 |
8.64 |
| 2026-07-29 12:00 |
16:48:47.64 |
-14:16:18.4 |
HIP 82323 |
8.89 |
| 2026-07-30 00:00 |
16:48:46.11 |
-14:16:21.4 |
HIP 82323 |
9.14 |
| 2026-07-30 12:00 |
16:48:44.61 |
-14:16:24.3 |
HIP 82323 |
9.39 |
| 2026-07-31 00:00 |
16:48:43.13 |
-14:16:27.4 |
HIP 82323 |
9.65 |
| 2026-07-31 12:00 |
16:48:41.67 |
-14:16:30.5 |
HIP 82323 |
9.91 |
| 2026-08-01 00:00 |
16:48:40.23 |
-14:16:33.7 |
HIP 82323 |
10.16 |
| 2026-08-01 12:00 |
16:48:38.82 |
-14:16:37.0 |
HIP 82323 |
10.42 |
| 2026-08-02 00:00 |
16:48:37.43 |
-14:16:40.3 |
HIP 82323 |
10.68 |
| 2026-08-02 12:00 |
16:48:36.07 |
-14:16:43.7 |
HIP 82323 |
10.94 |
| 2026-08-03 00:00 |
16:48:34.72 |
-14:16:47.2 |
HIP 82323 |
11.19 |
| 2026-08-03 12:00 |
16:48:33.41 |
-14:16:50.7 |
HIP 82323 |
11.45 |
| 2026-08-04 00:00 |
16:48:32.11 |
-14:16:54.4 |
HIP 82323 |
11.70 |
| 2026-08-04 12:00 |
16:48:30.84 |
-14:16:58.0 |
HIP 82323 |
11.95 |
| 2026-08-05 00:00 |
16:48:29.60 |
-14:17:01.8 |
HIP 82323 |
12.20 |
| 2026-08-05 12:00 |
16:48:28.37 |
-14:17:05.6 |
HIP 82323 |
12.44 |
| 2026-08-06 00:00 |
16:48:27.18 |
-14:17:09.5 |
HIP 82323 |
12.68 |
| 2026-08-06 12:00 |
16:48:26.00 |
-14:17:13.5 |
HIP 82323 |
12.91 |
| 2026-08-07 00:00 |
16:48:24.85 |
-14:17:17.5 |
HIP 82323 |
13.15 |
| 2026-08-07 12:00 |
16:48:23.73 |
-14:17:21.6 |
HIP 82323 |
13.38 |
| 2026-08-08 00:00 |
16:48:22.63 |
-14:17:25.8 |
HIP 82323 |
13.60 |
| 2026-08-08 12:00 |
16:48:21.56 |
-14:17:30.0 |
HIP 82323 |
13.82 |
| 2026-08-09 00:00 |
16:48:20.51 |
-14:17:34.4 |
HIP 82323 |
14.04 |
| 2026-08-09 12:00 |
16:48:19.48 |
-14:17:38.7 |
HIP 82323 |
14.25 |
| 2026-08-10 00:00 |
16:48:18.48 |
-14:17:43.2 |
HIP 82323 |
14.46 |
| 2026-08-10 12:00 |
16:48:17.51 |
-14:17:47.7 |
HIP 82323 |
14.66 |
| 2026-08-11 00:00 |
16:48:16.56 |
-14:17:52.3 |
HIP 82323 |
14.86 |
| 2026-08-11 12:00 |
16:48:15.64 |
-14:17:56.9 |
HIP 82323 |
15.05 |
| 2026-08-12 00:00 |
16:48:14.74 |
-14:18:01.6 |
HIP 82323 |
15.24 |
| 2026-08-12 12:00 |
16:48:13.87 |
-14:18:06.4 |
HIP 82323 |
15.42 |
| 2026-08-13 00:00 |
16:48:13.03 |
-14:18:11.3 |
HIP 82323 |
15.59 |
| 2026-08-13 12:00 |
16:48:12.21 |
-14:18:16.2 |
HIP 82323 |
15.77 |
| 2026-08-14 00:00 |
16:48:11.41 |
-14:18:21.2 |
HIP 82323 |
15.93 |
| 2026-08-14 12:00 |
16:48:10.65 |
-14:18:26.2 |
HIP 82323 |
16.09 |
| 2026-08-15 00:00 |
16:48:09.91 |
-14:18:31.3 |
HIP 82323 |
16.25 |
| 2026-08-15 12:00 |
16:48:09.19 |
-14:18:36.5 |
HIP 82323 |
16.40 |
| 2026-08-16 00:00 |
16:48:08.50 |
-14:18:41.7 |
HIP 82323 |
16.54 |
| 2026-08-16 12:00 |
16:48:07.84 |
-14:18:47.0 |
HIP 82323 |
16.68 |
| 2026-08-17 00:00 |
16:48:07.21 |
-14:18:52.4 |
HIP 82323 |
16.82 |
| 2026-08-17 12:00 |
16:48:06.60 |
-14:18:57.8 |
HIP 82323 |
16.94 |
| 2026-08-18 00:00 |
16:48:06.01 |
-14:19:03.3 |
HIP 82323 |
17.06 |
| 2026-08-18 12:00 |
16:48:05.46 |
-14:19:08.8 |
HIP 82323 |
17.18 |
| 2026-08-19 00:00 |
16:48:04.93 |
-14:19:14.4 |
HIP 82323 |
17.29 |