C/2006 A2 (Catalina)
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) |
| 2026-02-03 00:00 |
21:58:30.84 |
-45:15:11.9 |
HIP 108248 |
28.44 |
| 2026-02-03 12:00 |
21:58:34.52 |
-45:14:54.2 |
HIP 108248 |
29.08 |
| 2026-02-04 00:00 |
21:58:38.21 |
-45:14:36.7 |
HIP 108475 |
29.31 |
| 2026-02-04 12:00 |
21:58:41.90 |
-45:14:19.3 |
HIP 108475 |
29.06 |
| 2026-02-05 00:00 |
21:58:45.61 |
-45:14:02.2 |
HIP 108475 |
28.84 |
| 2026-02-05 12:00 |
21:58:49.31 |
-45:13:45.2 |
HIP 108475 |
28.63 |
| 2026-02-06 00:00 |
21:58:53.03 |
-45:13:28.4 |
HIP 108475 |
28.44 |
| 2026-02-06 12:00 |
21:58:56.75 |
-45:13:11.8 |
HIP 108475 |
28.28 |
| 2026-02-07 00:00 |
21:59:00.47 |
-45:12:55.4 |
HIP 108475 |
28.13 |
| 2026-02-07 12:00 |
21:59:04.20 |
-45:12:39.2 |
HIP 108475 |
28.00 |
| 2026-02-08 00:00 |
21:59:07.94 |
-45:12:23.1 |
HIP 108475 |
27.90 |
| 2026-02-08 12:00 |
21:59:11.68 |
-45:12:07.3 |
HIP 108475 |
27.81 |
| 2026-02-09 00:00 |
21:59:15.43 |
-45:11:51.7 |
HIP 108475 |
27.75 |
| 2026-02-09 12:00 |
21:59:19.18 |
-45:11:36.2 |
HIP 108475 |
27.71 |
| 2026-02-10 00:00 |
21:59:22.93 |
-45:11:21.0 |
HIP 108475 |
27.69 |
| 2026-02-10 12:00 |
21:59:26.69 |
-45:11:05.9 |
HIP 108475 |
27.70 |
| 2026-02-11 00:00 |
21:59:30.45 |
-45:10:51.1 |
HIP 108475 |
27.72 |
| 2026-02-11 12:00 |
21:59:34.21 |
-45:10:36.4 |
HIP 108475 |
27.76 |
| 2026-02-12 00:00 |
21:59:37.98 |
-45:10:21.9 |
HIP 108475 |
27.83 |
| 2026-02-12 12:00 |
21:59:41.75 |
-45:10:07.7 |
HIP 108475 |
27.92 |
| 2026-02-13 00:00 |
21:59:45.52 |
-45:09:53.7 |
HIP 108475 |
28.03 |
| 2026-02-13 12:00 |
21:59:49.29 |
-45:09:39.8 |
HIP 108475 |
28.16 |
| 2026-02-14 00:00 |
21:59:53.07 |
-45:09:26.2 |
HIP 108475 |
28.31 |
| 2026-02-14 12:00 |
21:59:56.84 |
-45:09:12.8 |
HIP 108475 |
28.48 |
| 2026-02-15 00:00 |
22:00:00.62 |
-45:08:59.5 |
HIP 108475 |
28.66 |
| 2026-02-15 12:00 |
22:00:04.40 |
-45:08:46.5 |
HIP 108475 |
28.87 |
| 2026-02-16 00:00 |
22:00:08.17 |
-45:08:33.7 |
HIP 108475 |
29.10 |
| 2026-02-16 12:00 |
22:00:11.95 |
-45:08:21.1 |
HIP 108475 |
29.34 |
| 2026-02-17 00:00 |
22:00:15.73 |
-45:08:08.8 |
HIP 108475 |
29.60 |
| 2026-02-17 12:00 |
22:00:19.51 |
-45:07:56.6 |
HIP 108475 |
29.88 |
| 2026-02-18 00:00 |
22:00:23.28 |
-45:07:44.7 |
HIP 108475 |
30.17 |
| 2026-02-18 12:00 |
22:00:27.06 |
-45:07:32.9 |
HIP 108475 |
30.48 |
| 2026-02-19 00:00 |
22:00:30.83 |
-45:07:21.4 |
HIP 108475 |
30.81 |
| 2026-02-19 12:00 |
22:00:34.60 |
-45:07:10.1 |
HIP 108475 |
31.15 |
| 2026-02-20 00:00 |
22:00:38.37 |
-45:06:59.1 |
HIP 108475 |
31.50 |
| 2026-02-20 12:00 |
22:00:42.14 |
-45:06:48.2 |
HIP 108475 |
31.86 |
| 2026-02-21 00:00 |
22:00:45.91 |
-45:06:37.6 |
HIP 108475 |
32.24 |
| 2026-02-21 12:00 |
22:00:49.67 |
-45:06:27.2 |
HIP 108475 |
32.63 |
| 2026-02-22 00:00 |
22:00:53.43 |
-45:06:17.0 |
HIP 108475 |
33.04 |
| 2026-02-22 12:00 |
22:00:57.18 |
-45:06:07.0 |
HIP 108475 |
33.45 |
| 2026-02-23 00:00 |
22:01:00.93 |
-45:05:57.3 |
HIP 108475 |
33.88 |
| 2026-02-23 12:00 |
22:01:04.68 |
-45:05:47.7 |
HIP 108475 |
34.31 |
| 2026-02-24 00:00 |
22:01:08.42 |
-45:05:38.4 |
HIP 108475 |
34.75 |