メタデータ
| 項目 |
値 |
| Designation |
C/2006 A2 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-05-20T02:43:40.612800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:56Z |
| Obs used |
89 |
| NEO |
- |
| M1 |
12.600 |
| 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) |
2006-03-18.0000000 |
| e |
0.99862239 |
| q (au) |
5.315949 |
| a (au) |
3858.814166 |
| i (deg) |
148.322579 |
| Ω (om, deg) |
233.225358 |
| ω (w, deg) |
141.018293 |
| M (ma, deg) |
0.001241 |
等級
散乱 + 全体線形
$$
M_a = (14.845 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.845 |
| n |
2.000 |
| gf |
0.992 |
| gb |
-0.701 |
| k |
0.800 |
| 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) |
| 2026-09-20 00:00 |
21:53:31.85 |
-47:03:06.6 |
HIP 108159 |
13.07 |
| 2026-09-20 12:00 |
21:53:27.84 |
-47:03:05.0 |
HIP 108159 |
13.72 |
| 2026-09-21 00:00 |
21:53:23.85 |
-47:03:03.1 |
HIP 108159 |
14.37 |
| 2026-09-21 12:00 |
21:53:19.89 |
-47:03:01.0 |
HIP 107965 |
14.92 |
| 2026-09-22 00:00 |
21:53:15.94 |
-47:02:58.6 |
HIP 107965 |
14.45 |
| 2026-09-22 12:00 |
21:53:12.02 |
-47:02:56.0 |
HIP 107965 |
14.00 |
| 2026-09-23 00:00 |
21:53:08.12 |
-47:02:53.1 |
HIP 107965 |
13.56 |
| 2026-09-23 12:00 |
21:53:04.24 |
-47:02:49.9 |
HIP 107965 |
13.15 |
| 2026-09-24 00:00 |
21:53:00.38 |
-47:02:46.5 |
HIP 107965 |
12.75 |
| 2026-09-24 12:00 |
21:52:56.55 |
-47:02:42.8 |
HIP 107965 |
12.37 |
| 2026-09-25 00:00 |
21:52:52.73 |
-47:02:38.9 |
HIP 107965 |
12.02 |
| 2026-09-25 12:00 |
21:52:48.94 |
-47:02:34.7 |
HIP 107965 |
11.68 |
| 2026-09-26 00:00 |
21:52:45.18 |
-47:02:30.3 |
HIP 107965 |
11.38 |
| 2026-09-26 12:00 |
21:52:41.43 |
-47:02:25.6 |
HIP 107965 |
11.10 |
| 2026-09-27 00:00 |
21:52:37.72 |
-47:02:20.7 |
HIP 107965 |
10.85 |
| 2026-09-27 12:00 |
21:52:34.02 |
-47:02:15.5 |
HIP 107965 |
10.62 |
| 2026-09-28 00:00 |
21:52:30.35 |
-47:02:10.1 |
HIP 107965 |
10.43 |
| 2026-09-28 12:00 |
21:52:26.70 |
-47:02:04.4 |
HIP 107965 |
10.27 |
| 2026-09-29 00:00 |
21:52:23.08 |
-47:01:58.5 |
HIP 107965 |
10.14 |
| 2026-09-29 12:00 |
21:52:19.49 |
-47:01:52.4 |
HIP 107965 |
10.05 |
| 2026-09-30 00:00 |
21:52:15.92 |
-47:01:45.9 |
HIP 107965 |
9.99 |
| 2026-09-30 12:00 |
21:52:12.37 |
-47:01:39.3 |
HIP 107965 |
9.96 |
| 2026-10-01 00:00 |
21:52:08.85 |
-47:01:32.4 |
HIP 107965 |
9.96 |
| 2026-10-01 12:00 |
21:52:05.36 |
-47:01:25.2 |
HIP 107965 |
10.00 |
| 2026-10-02 00:00 |
21:52:01.89 |
-47:01:17.8 |
HIP 107965 |
10.07 |
| 2026-10-02 12:00 |
21:51:58.45 |
-47:01:10.2 |
HIP 107965 |
10.17 |
| 2026-10-03 00:00 |
21:51:55.03 |
-47:01:02.3 |
HIP 107965 |
10.29 |
| 2026-10-03 12:00 |
21:51:51.64 |
-47:00:54.2 |
HIP 107965 |
10.45 |
| 2026-10-04 00:00 |
21:51:48.28 |
-47:00:45.8 |
HIP 107965 |
10.63 |
| 2026-10-04 12:00 |
21:51:44.95 |
-47:00:37.2 |
HIP 107965 |
10.83 |
| 2026-10-05 00:00 |
21:51:41.65 |
-47:00:28.3 |
HIP 107965 |
11.05 |
| 2026-10-05 12:00 |
21:51:38.37 |
-47:00:19.3 |
HIP 107965 |
11.30 |
| 2026-10-06 00:00 |
21:51:35.12 |
-47:00:09.9 |
HIP 107965 |
11.56 |
| 2026-10-06 12:00 |
21:51:31.90 |
-47:00:00.4 |
HIP 107965 |
11.83 |
| 2026-10-07 00:00 |
21:51:28.71 |
-46:59:50.6 |
HIP 107965 |
12.12 |
| 2026-10-07 12:00 |
21:51:25.55 |
-46:59:40.5 |
HIP 107965 |
12.43 |
| 2026-10-08 00:00 |
21:51:22.41 |
-46:59:30.3 |
HIP 107965 |
12.75 |
| 2026-10-08 12:00 |
21:51:19.31 |
-46:59:19.8 |
HIP 107965 |
13.07 |
| 2026-10-09 00:00 |
21:51:16.24 |
-46:59:09.0 |
HIP 107965 |
13.41 |
| 2026-10-09 12:00 |
21:51:13.19 |
-46:58:58.1 |
HIP 107965 |
13.75 |
| 2026-10-10 00:00 |
21:51:10.18 |
-46:58:46.9 |
HIP 107965 |
14.10 |
| 2026-10-10 12:00 |
21:51:07.19 |
-46:58:35.4 |
HIP 107965 |
14.46 |
| 2026-10-11 00:00 |
21:51:04.24 |
-46:58:23.8 |
HIP 107965 |
14.82 |