メタデータ
| 項目 |
値 |
| Designation |
C/2005 N4 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-07-02T14:23:55.170240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:51Z |
| Obs used |
206 |
| NEO |
- |
| M1 |
14.200 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2005-07-14.0000000 |
| e |
0.96061201 |
| q (au) |
2.303757 |
| a (au) |
58.488820 |
| i (deg) |
116.630292 |
| Ω (om, deg) |
64.036800 |
| ω (w, deg) |
136.545857 |
| M (ma, deg) |
0.025119 |
等級
散乱 + 全体線形
$$
M_a = (15.381 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.381 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-05-12 00:00 |
06:50:32.15 |
-32:12:08.9 |
HIP 32905 |
10.60 |
| 2026-05-12 12:00 |
06:50:34.33 |
-32:11:38.5 |
HIP 32905 |
10.09 |
| 2026-05-13 00:00 |
06:50:36.53 |
-32:11:08.3 |
HIP 32905 |
9.61 |
| 2026-05-13 12:00 |
06:50:38.76 |
-32:10:38.3 |
HIP 32905 |
9.15 |
| 2026-05-14 00:00 |
06:50:41.01 |
-32:10:08.5 |
HIP 32905 |
8.71 |
| 2026-05-14 12:00 |
06:50:43.28 |
-32:09:39.0 |
HIP 32905 |
8.30 |
| 2026-05-15 00:00 |
06:50:45.58 |
-32:09:09.7 |
HIP 32905 |
7.92 |
| 2026-05-15 12:00 |
06:50:47.90 |
-32:08:40.7 |
HIP 32905 |
7.58 |
| 2026-05-16 00:00 |
06:50:50.24 |
-32:08:11.9 |
HIP 32905 |
7.28 |
| 2026-05-16 12:00 |
06:50:52.60 |
-32:07:43.3 |
HIP 32905 |
7.03 |
| 2026-05-17 00:00 |
06:50:54.98 |
-32:07:15.0 |
HIP 32905 |
6.84 |
| 2026-05-17 12:00 |
06:50:57.38 |
-32:06:47.0 |
HIP 32905 |
6.71 |
| 2026-05-18 00:00 |
06:50:59.81 |
-32:06:19.2 |
HIP 32905 |
6.64 |
| 2026-05-18 12:00 |
06:51:02.26 |
-32:05:51.6 |
HIP 32905 |
6.63 |
| 2026-05-19 00:00 |
06:51:04.72 |
-32:05:24.3 |
HIP 32905 |
6.70 |
| 2026-05-19 12:00 |
06:51:07.21 |
-32:04:57.3 |
HIP 32905 |
6.82 |
| 2026-05-20 00:00 |
06:51:09.72 |
-32:04:30.5 |
HIP 32905 |
7.01 |
| 2026-05-20 12:00 |
06:51:12.25 |
-32:04:04.0 |
HIP 32905 |
7.25 |
| 2026-05-21 00:00 |
06:51:14.80 |
-32:03:37.7 |
HIP 32905 |
7.55 |
| 2026-05-21 12:00 |
06:51:17.37 |
-32:03:11.7 |
HIP 32905 |
7.89 |
| 2026-05-22 00:00 |
06:51:19.95 |
-32:02:46.0 |
HIP 32905 |
8.27 |
| 2026-05-22 12:00 |
06:51:22.56 |
-32:02:20.5 |
HIP 32905 |
8.68 |
| 2026-05-23 00:00 |
06:51:25.19 |
-32:01:55.3 |
HIP 32905 |
9.13 |
| 2026-05-23 12:00 |
06:51:27.83 |
-32:01:30.3 |
HIP 32905 |
9.60 |
| 2026-05-24 00:00 |
06:51:30.49 |
-32:01:05.6 |
HIP 32905 |
10.09 |
| 2026-05-24 12:00 |
06:51:33.18 |
-32:00:41.2 |
HIP 32985 |
9.88 |
| 2026-05-25 00:00 |
06:51:35.88 |
-32:00:17.0 |
HIP 32985 |
9.33 |
| 2026-05-25 12:00 |
06:51:38.59 |
-31:59:53.2 |
HIP 32985 |
8.79 |
| 2026-05-26 00:00 |
06:51:41.33 |
-31:59:29.6 |
HIP 32985 |
8.27 |
| 2026-05-26 12:00 |
06:51:44.08 |
-31:59:06.2 |
HIP 32985 |
7.77 |
| 2026-05-27 00:00 |
06:51:46.85 |
-31:58:43.2 |
HIP 32985 |
7.31 |
| 2026-05-27 12:00 |
06:51:49.64 |
-31:58:20.4 |
HIP 32985 |
6.88 |
| 2026-05-28 00:00 |
06:51:52.45 |
-31:57:57.9 |
HIP 32985 |
6.49 |
| 2026-05-28 12:00 |
06:51:55.27 |
-31:57:35.6 |
HIP 32985 |
6.15 |
| 2026-05-29 00:00 |
06:51:58.11 |
-31:57:13.7 |
HIP 32985 |
5.87 |
| 2026-05-29 12:00 |
06:52:00.96 |
-31:56:52.0 |
HIP 32985 |
5.65 |
| 2026-05-30 00:00 |
06:52:03.83 |
-31:56:30.6 |
HIP 32985 |
5.52 |
| 2026-05-30 12:00 |
06:52:06.72 |
-31:56:09.5 |
HIP 32985 |
5.47 |
| 2026-05-31 00:00 |
06:52:09.62 |
-31:55:48.6 |
HIP 32985 |
5.50 |
| 2026-05-31 12:00 |
06:52:12.54 |
-31:55:28.1 |
HIP 32985 |
5.62 |
| 2026-06-01 00:00 |
06:52:15.47 |
-31:55:07.8 |
HIP 32985 |
5.81 |
| 2026-06-01 12:00 |
06:52:18.42 |
-31:54:47.8 |
HIP 32985 |
6.08 |
| 2026-06-02 00:00 |
06:52:21.38 |
-31:54:28.1 |
HIP 32985 |
6.41 |