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) |
| 2026-03-26 00:00 |
06:49:11.37 |
-33:12:00.5 |
HIP 32709 |
13.19 |
| 2026-03-26 12:00 |
06:49:10.78 |
-33:11:18.3 |
HIP 32709 |
13.91 |
| 2026-03-27 00:00 |
06:49:10.22 |
-33:10:36.2 |
HIP 32709 |
14.62 |
| 2026-03-27 12:00 |
06:49:09.69 |
-33:09:54.0 |
HIP 32709 |
15.32 |
| 2026-03-28 00:00 |
06:49:09.20 |
-33:09:11.9 |
HIP 32709 |
16.03 |
| 2026-03-28 12:00 |
06:49:08.73 |
-33:08:29.7 |
HIP 32709 |
16.74 |
| 2026-03-29 00:00 |
06:49:08.31 |
-33:07:47.6 |
HIP 32709 |
17.44 |
| 2026-03-29 12:00 |
06:49:07.91 |
-33:07:05.5 |
HIP 32709 |
18.15 |
| 2026-03-30 00:00 |
06:49:07.55 |
-33:06:23.4 |
HIP 32709 |
18.85 |
| 2026-03-30 12:00 |
06:49:07.22 |
-33:05:41.3 |
HIP 32709 |
19.55 |
| 2026-03-31 00:00 |
06:49:06.93 |
-33:04:59.2 |
HIP 32709 |
20.25 |
| 2026-03-31 12:00 |
06:49:06.66 |
-33:04:17.2 |
HIP 32709 |
20.94 |
| 2026-04-01 00:00 |
06:49:06.43 |
-33:03:35.2 |
HIP 32709 |
21.64 |
| 2026-04-01 12:00 |
06:49:06.24 |
-33:02:53.3 |
HIP 32709 |
22.33 |
| 2026-04-02 00:00 |
06:49:06.07 |
-33:02:11.3 |
HIP 32853 |
22.58 |
| 2026-04-02 12:00 |
06:49:05.94 |
-33:01:29.4 |
HIP 32853 |
22.50 |
| 2026-04-03 00:00 |
06:49:05.84 |
-33:00:47.6 |
HIP 32853 |
22.43 |
| 2026-04-03 12:00 |
06:49:05.78 |
-33:00:05.8 |
HIP 32853 |
22.38 |
| 2026-04-04 00:00 |
06:49:05.74 |
-32:59:24.0 |
HIP 32853 |
22.34 |
| 2026-04-04 12:00 |
06:49:05.74 |
-32:58:42.3 |
HIP 32853 |
22.32 |
| 2026-04-05 00:00 |
06:49:05.77 |
-32:58:00.7 |
HIP 32853 |
22.31 |
| 2026-04-05 12:00 |
06:49:05.84 |
-32:57:19.0 |
HIP 32853 |
22.32 |
| 2026-04-06 00:00 |
06:49:05.93 |
-32:56:37.5 |
HIP 32853 |
22.35 |
| 2026-04-06 12:00 |
06:49:06.06 |
-32:55:56.0 |
HIP 32853 |
22.38 |
| 2026-04-07 00:00 |
06:49:06.22 |
-32:55:14.6 |
HIP 32853 |
22.43 |
| 2026-04-07 12:00 |
06:49:06.41 |
-32:54:33.2 |
HIP 32853 |
22.50 |
| 2026-04-08 00:00 |
06:49:06.64 |
-32:53:51.9 |
HIP 32716 |
21.98 |
| 2026-04-08 12:00 |
06:49:06.90 |
-32:53:10.7 |
HIP 32716 |
21.30 |
| 2026-04-09 00:00 |
06:49:07.19 |
-32:52:29.5 |
HIP 32716 |
20.62 |
| 2026-04-09 12:00 |
06:49:07.51 |
-32:51:48.5 |
HIP 32716 |
19.94 |
| 2026-04-10 00:00 |
06:49:07.86 |
-32:51:07.5 |
HIP 32716 |
19.26 |
| 2026-04-10 12:00 |
06:49:08.25 |
-32:50:26.6 |
HIP 32716 |
18.58 |
| 2026-04-11 00:00 |
06:49:08.66 |
-32:49:45.7 |
HIP 32716 |
17.91 |
| 2026-04-11 12:00 |
06:49:09.11 |
-32:49:05.0 |
HIP 32716 |
17.23 |
| 2026-04-12 00:00 |
06:49:09.59 |
-32:48:24.3 |
HIP 32716 |
16.55 |
| 2026-04-12 12:00 |
06:49:10.11 |
-32:47:43.8 |
HIP 32716 |
15.87 |
| 2026-04-13 00:00 |
06:49:10.65 |
-32:47:03.3 |
HIP 32716 |
15.19 |
| 2026-04-13 12:00 |
06:49:11.23 |
-32:46:22.9 |
HIP 32716 |
14.51 |
| 2026-04-14 00:00 |
06:49:11.83 |
-32:45:42.7 |
HIP 32716 |
13.83 |
| 2026-04-14 12:00 |
06:49:12.47 |
-32:45:02.5 |
HIP 32716 |
13.16 |
| 2026-04-15 00:00 |
06:49:13.14 |
-32:44:22.5 |
HIP 32716 |
12.48 |
| 2026-04-15 12:00 |
06:49:13.84 |
-32:43:42.5 |
HIP 32716 |
11.80 |
| 2026-04-16 00:00 |
06:49:14.57 |
-32:43:02.7 |
HIP 32716 |
11.12 |