メタデータ
| 項目 |
値 |
| Designation |
C/2013 G5 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-09-01T12:06:25.499520Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:44:04Z |
| Obs used |
114 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
11.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-04-23.0000000 |
| e |
0.99971461 |
| q (au) |
0.928919 |
| a (au) |
3254.937233 |
| i (deg) |
40.613476 |
| Ω (om, deg) |
144.282160 |
| ω (w, deg) |
165.667285 |
| M (ma, deg) |
359.999302 |
等級
散乱 + 全体線形
$$
M_a = (15.455 + 2.768\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.455 |
| n |
2.768 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
1.000 |
| 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 |
07:45:31.89 |
-00:21:42.0 |
HIP 37824 |
5.67 |
| 2026-09-20 12:00 |
07:45:33.71 |
-00:22:04.1 |
HIP 37824 |
5.67 |
| 2026-09-21 00:00 |
07:45:35.51 |
-00:22:26.2 |
HIP 37824 |
5.73 |
| 2026-09-21 12:00 |
07:45:37.27 |
-00:22:48.3 |
HIP 37824 |
5.83 |
| 2026-09-22 00:00 |
07:45:39.01 |
-00:23:10.4 |
HIP 37824 |
5.99 |
| 2026-09-22 12:00 |
07:45:40.72 |
-00:23:32.5 |
HIP 37824 |
6.18 |
| 2026-09-23 00:00 |
07:45:42.40 |
-00:23:54.7 |
HIP 37824 |
6.41 |
| 2026-09-23 12:00 |
07:45:44.05 |
-00:24:16.8 |
HIP 37824 |
6.68 |
| 2026-09-24 00:00 |
07:45:45.67 |
-00:24:39.0 |
HIP 37825 |
6.96 |
| 2026-09-24 12:00 |
07:45:47.26 |
-00:25:01.2 |
HIP 37825 |
7.25 |
| 2026-09-25 00:00 |
07:45:48.82 |
-00:25:23.4 |
HIP 37825 |
7.57 |
| 2026-09-25 12:00 |
07:45:50.36 |
-00:25:45.5 |
HIP 37825 |
7.89 |
| 2026-09-26 00:00 |
07:45:51.86 |
-00:26:07.7 |
HIP 37825 |
8.24 |
| 2026-09-26 12:00 |
07:45:53.34 |
-00:26:29.9 |
HIP 37825 |
8.59 |
| 2026-09-27 00:00 |
07:45:54.79 |
-00:26:52.1 |
HIP 37825 |
8.96 |
| 2026-09-27 12:00 |
07:45:56.20 |
-00:27:14.2 |
HIP 37831 |
9.30 |
| 2026-09-28 00:00 |
07:45:57.59 |
-00:27:36.4 |
HIP 37831 |
9.49 |
| 2026-09-28 12:00 |
07:45:58.94 |
-00:27:58.6 |
HIP 37831 |
9.70 |
| 2026-09-29 00:00 |
07:46:00.27 |
-00:28:20.7 |
HIP 37831 |
9.91 |
| 2026-09-29 12:00 |
07:46:01.57 |
-00:28:42.9 |
HIP 37831 |
10.15 |
| 2026-09-30 00:00 |
07:46:02.83 |
-00:29:05.0 |
HIP 37831 |
10.39 |
| 2026-09-30 12:00 |
07:46:04.07 |
-00:29:27.2 |
HIP 37831 |
10.64 |
| 2026-10-01 00:00 |
07:46:05.27 |
-00:29:49.3 |
HIP 37831 |
10.90 |
| 2026-10-01 12:00 |
07:46:06.45 |
-00:30:11.4 |
HIP 37831 |
11.17 |
| 2026-10-02 00:00 |
07:46:07.59 |
-00:30:33.4 |
HIP 37831 |
11.44 |
| 2026-10-02 12:00 |
07:46:08.70 |
-00:30:55.5 |
HIP 37831 |
11.71 |
| 2026-10-03 00:00 |
07:46:09.79 |
-00:31:17.5 |
HIP 37831 |
11.99 |
| 2026-10-03 12:00 |
07:46:10.84 |
-00:31:39.6 |
HIP 37831 |
12.28 |
| 2026-10-04 00:00 |
07:46:11.86 |
-00:32:01.6 |
HIP 37831 |
12.56 |
| 2026-10-04 12:00 |
07:46:12.84 |
-00:32:23.5 |
HIP 37831 |
12.85 |
| 2026-10-05 00:00 |
07:46:13.80 |
-00:32:45.5 |
HIP 37831 |
13.13 |
| 2026-10-05 12:00 |
07:46:14.73 |
-00:33:07.4 |
HIP 37831 |
13.42 |
| 2026-10-06 00:00 |
07:46:15.62 |
-00:33:29.3 |
HIP 37831 |
13.71 |
| 2026-10-06 12:00 |
07:46:16.48 |
-00:33:51.1 |
HIP 37831 |
13.99 |
| 2026-10-07 00:00 |
07:46:17.31 |
-00:34:12.9 |
HIP 37831 |
14.28 |
| 2026-10-07 12:00 |
07:46:18.11 |
-00:34:34.7 |
HIP 37831 |
14.56 |
| 2026-10-08 00:00 |
07:46:18.87 |
-00:34:56.5 |
HIP 37831 |
14.84 |
| 2026-10-08 12:00 |
07:46:19.61 |
-00:35:18.2 |
HIP 37831 |
15.12 |
| 2026-10-09 00:00 |
07:46:20.31 |
-00:35:39.8 |
HIP 37831 |
15.40 |
| 2026-10-09 12:00 |
07:46:20.98 |
-00:36:01.5 |
HIP 37831 |
15.68 |
| 2026-10-10 00:00 |
07:46:21.61 |
-00:36:23.0 |
HIP 37831 |
15.95 |
| 2026-10-10 12:00 |
07:46:22.22 |
-00:36:44.6 |
HIP 37831 |
16.22 |
| 2026-10-11 00:00 |
07:46:22.79 |
-00:37:06.0 |
HIP 37831 |
16.48 |