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) |
| 2026-09-20 00:00 |
16:48:27.45 |
-14:27:01.7 |
HIP 82323 |
12.58 |
| 2026-09-20 12:00 |
16:48:28.68 |
-14:27:10.3 |
HIP 82323 |
12.36 |
| 2026-09-21 00:00 |
16:48:29.94 |
-14:27:19.0 |
HIP 82323 |
12.14 |
| 2026-09-21 12:00 |
16:48:31.22 |
-14:27:27.7 |
HIP 82323 |
11.93 |
| 2026-09-22 00:00 |
16:48:32.53 |
-14:27:36.4 |
HIP 82323 |
11.71 |
| 2026-09-22 12:00 |
16:48:33.86 |
-14:27:45.2 |
HIP 82323 |
11.50 |
| 2026-09-23 00:00 |
16:48:35.23 |
-14:27:53.9 |
HIP 82323 |
11.28 |
| 2026-09-23 12:00 |
16:48:36.61 |
-14:28:02.7 |
HIP 82323 |
11.07 |
| 2026-09-24 00:00 |
16:48:38.02 |
-14:28:11.6 |
HIP 82323 |
10.87 |
| 2026-09-24 12:00 |
16:48:39.46 |
-14:28:20.4 |
HIP 82323 |
10.67 |
| 2026-09-25 00:00 |
16:48:40.93 |
-14:28:29.3 |
HIP 82323 |
10.47 |
| 2026-09-25 12:00 |
16:48:42.41 |
-14:28:38.2 |
HIP 82323 |
10.28 |
| 2026-09-26 00:00 |
16:48:43.93 |
-14:28:47.2 |
HIP 82323 |
10.09 |
| 2026-09-26 12:00 |
16:48:45.47 |
-14:28:56.1 |
HIP 82323 |
9.92 |
| 2026-09-27 00:00 |
16:48:47.03 |
-14:29:05.1 |
HIP 82323 |
9.75 |
| 2026-09-27 12:00 |
16:48:48.62 |
-14:29:14.1 |
HIP 82323 |
9.60 |
| 2026-09-28 00:00 |
16:48:50.24 |
-14:29:23.1 |
HIP 82323 |
9.45 |
| 2026-09-28 12:00 |
16:48:51.88 |
-14:29:32.1 |
HIP 82323 |
9.32 |
| 2026-09-29 00:00 |
16:48:53.54 |
-14:29:41.2 |
HIP 82323 |
9.20 |
| 2026-09-29 12:00 |
16:48:55.23 |
-14:29:50.3 |
HIP 82323 |
9.10 |
| 2026-09-30 00:00 |
16:48:56.94 |
-14:29:59.3 |
HIP 82323 |
9.02 |
| 2026-09-30 12:00 |
16:48:58.68 |
-14:30:08.5 |
HIP 82323 |
8.96 |
| 2026-10-01 00:00 |
16:49:00.44 |
-14:30:17.6 |
HIP 82323 |
8.91 |
| 2026-10-01 12:00 |
16:49:02.23 |
-14:30:26.7 |
HIP 82323 |
8.89 |
| 2026-10-02 00:00 |
16:49:04.04 |
-14:30:35.9 |
HIP 82323 |
8.89 |
| 2026-10-02 12:00 |
16:49:05.88 |
-14:30:45.1 |
HIP 82323 |
8.91 |
| 2026-10-03 00:00 |
16:49:07.74 |
-14:30:54.3 |
HIP 82323 |
8.95 |
| 2026-10-03 12:00 |
16:49:09.62 |
-14:31:03.5 |
HIP 82323 |
9.02 |
| 2026-10-04 00:00 |
16:49:11.53 |
-14:31:12.7 |
HIP 82323 |
9.12 |
| 2026-10-04 12:00 |
16:49:13.46 |
-14:31:21.9 |
HIP 82323 |
9.24 |
| 2026-10-05 00:00 |
16:49:15.42 |
-14:31:31.2 |
HIP 82323 |
9.38 |
| 2026-10-05 12:00 |
16:49:17.40 |
-14:31:40.4 |
HIP 82323 |
9.55 |
| 2026-10-06 00:00 |
16:49:19.40 |
-14:31:49.7 |
HIP 82323 |
9.74 |
| 2026-10-06 12:00 |
16:49:21.43 |
-14:31:59.0 |
HIP 82323 |
9.95 |
| 2026-10-07 00:00 |
16:49:23.48 |
-14:32:08.3 |
HIP 82323 |
10.19 |
| 2026-10-07 12:00 |
16:49:25.55 |
-14:32:17.6 |
HIP 82323 |
10.45 |
| 2026-10-08 00:00 |
16:49:27.65 |
-14:32:26.9 |
HIP 82323 |
10.73 |
| 2026-10-08 12:00 |
16:49:29.76 |
-14:32:36.2 |
HIP 82323 |
11.03 |
| 2026-10-09 00:00 |
16:49:31.91 |
-14:32:45.5 |
HIP 82323 |
11.35 |
| 2026-10-09 12:00 |
16:49:34.07 |
-14:32:54.9 |
HIP 82323 |
11.69 |
| 2026-10-10 00:00 |
16:49:36.26 |
-14:33:04.2 |
HIP 82323 |
12.05 |
| 2026-10-10 12:00 |
16:49:38.47 |
-14:33:13.6 |
HIP 82323 |
12.42 |
| 2026-10-11 00:00 |
16:49:40.70 |
-14:33:22.9 |
HIP 82323 |
12.81 |