メタデータ
| 項目 |
値 |
| Designation |
C/2005 N5 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-08-22T16:21:26.827200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:51Z |
| Obs used |
233 |
| NEO |
- |
| M1 |
16.000 |
| 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) |
2005-09-18.0000000 |
| e |
0.94327002 |
| q (au) |
1.627399 |
| a (au) |
28.686757 |
| i (deg) |
21.378745 |
| Ω (om, deg) |
156.411335 |
| ω (w, deg) |
207.765233 |
| M (ma, deg) |
0.168827 |
等級
散乱 + 全体線形
$$
M_a = (15.595 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.595 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.994 |
| δ90 |
10.000 |
| 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 |
11:22:19.67 |
+08:41:48.7 |
HIP 55511 |
20.26 |
| 2026-09-20 12:00 |
11:22:22.90 |
+08:41:29.9 |
HIP 55511 |
20.69 |
| 2026-09-21 00:00 |
11:22:26.13 |
+08:41:11.1 |
HIP 55625 |
20.89 |
| 2026-09-21 12:00 |
11:22:29.36 |
+08:40:52.4 |
HIP 55625 |
20.04 |
| 2026-09-22 00:00 |
11:22:32.58 |
+08:40:33.8 |
HIP 55625 |
19.18 |
| 2026-09-22 12:00 |
11:22:35.80 |
+08:40:15.2 |
HIP 55625 |
18.33 |
| 2026-09-23 00:00 |
11:22:39.01 |
+08:39:56.7 |
HIP 55625 |
17.47 |
| 2026-09-23 12:00 |
11:22:42.22 |
+08:39:38.2 |
HIP 55625 |
16.62 |
| 2026-09-24 00:00 |
11:22:45.43 |
+08:39:19.9 |
HIP 55625 |
15.78 |
| 2026-09-24 12:00 |
11:22:48.63 |
+08:39:01.5 |
HIP 55625 |
14.93 |
| 2026-09-25 00:00 |
11:22:51.82 |
+08:38:43.3 |
HIP 55625 |
14.08 |
| 2026-09-25 12:00 |
11:22:55.01 |
+08:38:25.1 |
HIP 55625 |
13.24 |
| 2026-09-26 00:00 |
11:22:58.19 |
+08:38:06.9 |
HIP 55625 |
12.39 |
| 2026-09-26 12:00 |
11:23:01.37 |
+08:37:48.9 |
HIP 55625 |
11.55 |
| 2026-09-27 00:00 |
11:23:04.54 |
+08:37:30.9 |
HIP 55625 |
10.71 |
| 2026-09-27 12:00 |
11:23:07.71 |
+08:37:12.9 |
HIP 55625 |
9.88 |
| 2026-09-28 00:00 |
11:23:10.87 |
+08:36:55.1 |
HIP 55625 |
9.04 |
| 2026-09-28 12:00 |
11:23:14.02 |
+08:36:37.3 |
HIP 55625 |
8.21 |
| 2026-09-29 00:00 |
11:23:17.17 |
+08:36:19.6 |
HIP 55625 |
7.37 |
| 2026-09-29 12:00 |
11:23:20.31 |
+08:36:01.9 |
HIP 55625 |
6.54 |
| 2026-09-30 00:00 |
11:23:23.44 |
+08:35:44.4 |
HIP 55625 |
5.72 |
| 2026-09-30 12:00 |
11:23:26.56 |
+08:35:26.9 |
HIP 55625 |
4.89 |
| 2026-10-01 00:00 |
11:23:29.68 |
+08:35:09.5 |
HIP 55625 |
4.07 |
| 2026-10-01 12:00 |
11:23:32.79 |
+08:34:52.1 |
HIP 55625 |
3.25 |
| 2026-10-02 00:00 |
11:23:35.90 |
+08:34:34.9 |
HIP 55625 |
2.43 |
| 2026-10-02 12:00 |
11:23:38.99 |
+08:34:17.7 |
HIP 55625 |
1.61 |
| 2026-10-03 00:00 |
11:23:42.08 |
+08:34:00.6 |
HIP 55625 |
0.80 |
| 2026-10-03 12:00 |
11:23:45.15 |
+08:33:43.6 |
HIP 55625 |
0.05 |
| 2026-10-04 00:00 |
11:23:48.22 |
+08:33:26.7 |
HIP 55625 |
0.83 |
| 2026-10-04 12:00 |
11:23:51.28 |
+08:33:09.9 |
HIP 55625 |
1.63 |
| 2026-10-05 00:00 |
11:23:54.34 |
+08:32:53.2 |
HIP 55625 |
2.44 |
| 2026-10-05 12:00 |
11:23:57.38 |
+08:32:36.5 |
HIP 55625 |
3.24 |
| 2026-10-06 00:00 |
11:24:00.41 |
+08:32:20.0 |
HIP 55625 |
4.04 |
| 2026-10-06 12:00 |
11:24:03.43 |
+08:32:03.5 |
HIP 55625 |
4.83 |
| 2026-10-07 00:00 |
11:24:06.45 |
+08:31:47.1 |
HIP 55625 |
5.63 |
| 2026-10-07 12:00 |
11:24:09.45 |
+08:31:30.8 |
HIP 55625 |
6.42 |
| 2026-10-08 00:00 |
11:24:12.44 |
+08:31:14.6 |
HIP 55625 |
7.21 |
| 2026-10-08 12:00 |
11:24:15.43 |
+08:30:58.6 |
HIP 55625 |
7.99 |
| 2026-10-09 00:00 |
11:24:18.40 |
+08:30:42.6 |
HIP 55625 |
8.77 |
| 2026-10-09 12:00 |
11:24:21.36 |
+08:30:26.7 |
HIP 55625 |
9.55 |
| 2026-10-10 00:00 |
11:24:24.31 |
+08:30:10.9 |
HIP 55625 |
10.32 |
| 2026-10-10 12:00 |
11:24:27.25 |
+08:29:55.2 |
HIP 55625 |
11.10 |
| 2026-10-11 00:00 |
11:24:30.17 |
+08:29:39.6 |
HIP 55625 |
11.87 |