メタデータ
| 項目 |
値 |
| Designation |
C/2013 S1 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-08-02T22:01:29.435520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:40Z |
| Obs used |
109 |
| NEO |
- |
| M1 |
13.500 |
| 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) |
2013-10-10.0000000 |
| e |
1.00043244 |
| q (au) |
2.824323 |
| a (au) |
-6531.154578 |
| i (deg) |
83.961966 |
| Ω (om, deg) |
221.536559 |
| ω (w, deg) |
166.064281 |
| M (ma, deg) |
0.000127 |
等級
散乱 + 全体線形
$$
M_a = (11.895 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.895 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.503 |
| k |
0.800 |
| 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 |
12:07:28.87 |
-60:01:30.2 |
HIP 59064 |
17.14 |
| 2026-03-26 12:00 |
12:07:21.48 |
-60:01:10.6 |
HIP 59064 |
16.55 |
| 2026-03-27 00:00 |
12:07:14.10 |
-60:00:50.5 |
HIP 59064 |
16.00 |
| 2026-03-27 12:00 |
12:07:06.72 |
-60:00:29.9 |
HIP 59064 |
15.48 |
| 2026-03-28 00:00 |
12:06:59.36 |
-60:00:08.8 |
HIP 59064 |
15.01 |
| 2026-03-28 12:00 |
12:06:52.00 |
-59:59:47.2 |
HIP 59064 |
14.57 |
| 2026-03-29 00:00 |
12:06:44.65 |
-59:59:25.2 |
HIP 59064 |
14.18 |
| 2026-03-29 12:00 |
12:06:37.31 |
-59:59:02.6 |
HIP 59064 |
13.85 |
| 2026-03-30 00:00 |
12:06:29.98 |
-59:58:39.6 |
HIP 59064 |
13.57 |
| 2026-03-30 12:00 |
12:06:22.67 |
-59:58:16.0 |
HIP 58922 |
12.68 |
| 2026-03-31 00:00 |
12:06:15.36 |
-59:57:52.0 |
HIP 58922 |
11.69 |
| 2026-03-31 12:00 |
12:06:08.07 |
-59:57:27.5 |
HIP 58922 |
10.71 |
| 2026-04-01 00:00 |
12:06:00.79 |
-59:57:02.5 |
HIP 58922 |
9.72 |
| 2026-04-01 12:00 |
12:05:53.53 |
-59:56:37.1 |
HIP 58922 |
8.73 |
| 2026-04-02 00:00 |
12:05:46.28 |
-59:56:11.2 |
HIP 58922 |
7.75 |
| 2026-04-02 12:00 |
12:05:39.05 |
-59:55:44.8 |
HIP 58922 |
6.77 |
| 2026-04-03 00:00 |
12:05:31.83 |
-59:55:17.9 |
HIP 58922 |
5.79 |
| 2026-04-03 12:00 |
12:05:24.63 |
-59:54:50.5 |
HIP 58922 |
4.82 |
| 2026-04-04 00:00 |
12:05:17.44 |
-59:54:22.7 |
HIP 58922 |
3.87 |
| 2026-04-04 12:00 |
12:05:10.27 |
-59:53:54.4 |
HIP 58922 |
2.96 |
| 2026-04-05 00:00 |
12:05:03.13 |
-59:53:25.7 |
HIP 58922 |
2.13 |
| 2026-04-05 12:00 |
12:04:56.00 |
-59:52:56.5 |
HIP 58922 |
1.54 |
| 2026-04-06 00:00 |
12:04:48.89 |
-59:52:26.8 |
HIP 58922 |
1.50 |
| 2026-04-06 12:00 |
12:04:41.80 |
-59:51:56.7 |
HIP 58922 |
2.05 |
| 2026-04-07 00:00 |
12:04:34.73 |
-59:51:26.1 |
HIP 58922 |
2.87 |
| 2026-04-07 12:00 |
12:04:27.69 |
-59:50:55.1 |
HIP 58922 |
3.79 |
| 2026-04-08 00:00 |
12:04:20.66 |
-59:50:23.6 |
HIP 58922 |
4.75 |
| 2026-04-08 12:00 |
12:04:13.66 |
-59:49:51.7 |
HIP 58922 |
5.73 |
| 2026-04-09 00:00 |
12:04:06.69 |
-59:49:19.3 |
HIP 58922 |
6.73 |
| 2026-04-09 12:00 |
12:03:59.73 |
-59:48:46.5 |
HIP 58922 |
7.73 |
| 2026-04-10 00:00 |
12:03:52.81 |
-59:48:13.2 |
HIP 58922 |
8.74 |
| 2026-04-10 12:00 |
12:03:45.90 |
-59:47:39.5 |
HIP 58922 |
9.76 |
| 2026-04-11 00:00 |
12:03:39.03 |
-59:47:05.3 |
HIP 58922 |
10.78 |
| 2026-04-11 12:00 |
12:03:32.18 |
-59:46:30.8 |
HIP 58922 |
11.80 |
| 2026-04-12 00:00 |
12:03:25.36 |
-59:45:55.8 |
HIP 58922 |
12.83 |
| 2026-04-12 12:00 |
12:03:18.57 |
-59:45:20.3 |
HIP 58922 |
13.85 |
| 2026-04-13 00:00 |
12:03:11.80 |
-59:44:44.5 |
HIP 58922 |
14.88 |
| 2026-04-13 12:00 |
12:03:05.07 |
-59:44:08.2 |
HIP 58922 |
15.91 |
| 2026-04-14 00:00 |
12:02:58.36 |
-59:43:31.5 |
HIP 58699 |
16.43 |
| 2026-04-14 12:00 |
12:02:51.69 |
-59:42:54.4 |
HIP 58699 |
16.82 |
| 2026-04-15 00:00 |
12:02:45.04 |
-59:42:16.8 |
HIP 58699 |
17.26 |
| 2026-04-15 12:00 |
12:02:38.43 |
-59:41:38.9 |
HIP 58699 |
17.76 |
| 2026-04-16 00:00 |
12:02:31.85 |
-59:41:00.6 |
HIP 58699 |
18.32 |