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
$$
M_a = (14.835 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.835 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.701 |
| k |
0.800 |
| δ90 |
8.918 |
| 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) |
| 2026-03-26 00:00 |
22:04:34.93 |
-45:03:29.5 |
HIP 108987 |
26.00 |
| 2026-03-26 12:00 |
22:04:37.91 |
-45:03:34.7 |
HIP 108987 |
25.88 |
| 2026-03-27 00:00 |
22:04:40.86 |
-45:03:40.1 |
HIP 108987 |
25.77 |
| 2026-03-27 12:00 |
22:04:43.80 |
-45:03:45.8 |
HIP 108987 |
25.66 |
| 2026-03-28 00:00 |
22:04:46.71 |
-45:03:51.7 |
HIP 108987 |
25.56 |
| 2026-03-28 12:00 |
22:04:49.61 |
-45:03:57.9 |
HIP 108987 |
25.47 |
| 2026-03-29 00:00 |
22:04:52.48 |
-45:04:04.3 |
HIP 108987 |
25.38 |
| 2026-03-29 12:00 |
22:04:55.33 |
-45:04:10.9 |
HIP 108987 |
25.30 |
| 2026-03-30 00:00 |
22:04:58.16 |
-45:04:17.8 |
HIP 108987 |
25.23 |
| 2026-03-30 12:00 |
22:05:00.97 |
-45:04:24.9 |
HIP 108987 |
25.16 |
| 2026-03-31 00:00 |
22:05:03.76 |
-45:04:32.3 |
HIP 108987 |
25.09 |
| 2026-03-31 12:00 |
22:05:06.52 |
-45:04:39.9 |
HIP 108987 |
25.03 |
| 2026-04-01 00:00 |
22:05:09.26 |
-45:04:47.7 |
HIP 108987 |
24.98 |
| 2026-04-01 12:00 |
22:05:11.98 |
-45:04:55.7 |
HIP 109166 |
24.88 |
| 2026-04-02 00:00 |
22:05:14.68 |
-45:05:04.0 |
HIP 109166 |
24.46 |
| 2026-04-02 12:00 |
22:05:17.35 |
-45:05:12.6 |
HIP 109166 |
24.05 |
| 2026-04-03 00:00 |
22:05:20.00 |
-45:05:21.4 |
HIP 109166 |
23.63 |
| 2026-04-03 12:00 |
22:05:22.63 |
-45:05:30.4 |
HIP 109166 |
23.22 |
| 2026-04-04 00:00 |
22:05:25.23 |
-45:05:39.6 |
HIP 109166 |
22.82 |
| 2026-04-04 12:00 |
22:05:27.81 |
-45:05:49.1 |
HIP 109166 |
22.41 |
| 2026-04-05 00:00 |
22:05:30.36 |
-45:05:58.8 |
HIP 109166 |
22.01 |
| 2026-04-05 12:00 |
22:05:32.89 |
-45:06:08.7 |
HIP 109166 |
21.61 |
| 2026-04-06 00:00 |
22:05:35.40 |
-45:06:18.9 |
HIP 109166 |
21.21 |
| 2026-04-06 12:00 |
22:05:37.88 |
-45:06:29.3 |
HIP 109166 |
20.82 |
| 2026-04-07 00:00 |
22:05:40.34 |
-45:06:40.0 |
HIP 109166 |
20.42 |
| 2026-04-07 12:00 |
22:05:42.77 |
-45:06:50.9 |
HIP 109166 |
20.03 |
| 2026-04-08 00:00 |
22:05:45.18 |
-45:07:02.0 |
HIP 109166 |
19.64 |
| 2026-04-08 12:00 |
22:05:47.56 |
-45:07:13.3 |
HIP 109166 |
19.26 |
| 2026-04-09 00:00 |
22:05:49.92 |
-45:07:24.9 |
HIP 109166 |
18.88 |
| 2026-04-09 12:00 |
22:05:52.25 |
-45:07:36.7 |
HIP 109166 |
18.50 |
| 2026-04-10 00:00 |
22:05:54.55 |
-45:07:48.7 |
HIP 109166 |
18.12 |
| 2026-04-10 12:00 |
22:05:56.83 |
-45:08:01.0 |
HIP 109166 |
17.74 |
| 2026-04-11 00:00 |
22:05:59.08 |
-45:08:13.5 |
HIP 109166 |
17.37 |
| 2026-04-11 12:00 |
22:06:01.31 |
-45:08:26.2 |
HIP 109166 |
17.00 |
| 2026-04-12 00:00 |
22:06:03.51 |
-45:08:39.1 |
HIP 109166 |
16.63 |
| 2026-04-12 12:00 |
22:06:05.68 |
-45:08:52.3 |
HIP 109166 |
16.26 |
| 2026-04-13 00:00 |
22:06:07.82 |
-45:09:05.7 |
HIP 109166 |
15.90 |
| 2026-04-13 12:00 |
22:06:09.94 |
-45:09:19.3 |
HIP 109166 |
15.54 |
| 2026-04-14 00:00 |
22:06:12.03 |
-45:09:33.2 |
HIP 109166 |
15.18 |
| 2026-04-14 12:00 |
22:06:14.09 |
-45:09:47.2 |
HIP 109166 |
14.82 |
| 2026-04-15 00:00 |
22:06:16.13 |
-45:10:01.5 |
HIP 109166 |
14.47 |
| 2026-04-15 12:00 |
22:06:18.13 |
-45:10:16.0 |
HIP 109166 |
14.12 |
| 2026-04-16 00:00 |
22:06:20.11 |
-45:10:30.8 |
HIP 109166 |
13.77 |