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) |
| 2026-07-29 00:00 |
07:40:14.42 |
+00:10:41.1 |
HIP 37274 |
15.34 |
| 2026-07-29 12:00 |
07:40:18.19 |
+00:10:28.8 |
HIP 37274 |
16.20 |
| 2026-07-30 00:00 |
07:40:21.96 |
+00:10:16.4 |
HIP 37274 |
17.07 |
| 2026-07-30 12:00 |
07:40:25.71 |
+00:10:03.8 |
HIP 37274 |
17.95 |
| 2026-07-31 00:00 |
07:40:29.46 |
+00:09:51.1 |
HIP 37274 |
18.83 |
| 2026-07-31 12:00 |
07:40:33.20 |
+00:09:38.2 |
HIP 37274 |
19.72 |
| 2026-08-01 00:00 |
07:40:36.93 |
+00:09:25.1 |
HIP 37274 |
20.61 |
| 2026-08-01 12:00 |
07:40:40.66 |
+00:09:12.0 |
HIP 37274 |
21.50 |
| 2026-08-02 00:00 |
07:40:44.37 |
+00:08:58.6 |
HIP 37274 |
22.40 |
| 2026-08-02 12:00 |
07:40:48.08 |
+00:08:45.1 |
HIP 37274 |
23.30 |
| 2026-08-03 00:00 |
07:40:51.78 |
+00:08:31.5 |
HIP 37274 |
24.20 |
| 2026-08-03 12:00 |
07:40:55.47 |
+00:08:17.8 |
HIP 37274 |
25.11 |
| 2026-08-04 00:00 |
07:40:59.15 |
+00:08:03.9 |
HIP 37274 |
26.01 |
| 2026-08-04 12:00 |
07:41:02.82 |
+00:07:49.8 |
HIP 37274 |
26.92 |
| 2026-08-05 00:00 |
07:41:06.48 |
+00:07:35.6 |
HIP 37274 |
27.82 |
| 2026-08-05 12:00 |
07:41:10.13 |
+00:07:21.3 |
HIP 37274 |
28.73 |
| 2026-08-06 00:00 |
07:41:13.77 |
+00:07:06.8 |
HIP 37614 |
28.23 |
| 2026-08-06 12:00 |
07:41:17.40 |
+00:06:52.2 |
HIP 37614 |
27.38 |
| 2026-08-07 00:00 |
07:41:21.02 |
+00:06:37.4 |
HIP 37614 |
26.53 |
| 2026-08-07 12:00 |
07:41:24.63 |
+00:06:22.5 |
HIP 37614 |
25.69 |
| 2026-08-08 00:00 |
07:41:28.23 |
+00:06:07.5 |
HIP 37614 |
24.86 |
| 2026-08-08 12:00 |
07:41:31.81 |
+00:05:52.4 |
HIP 37614 |
24.04 |
| 2026-08-09 00:00 |
07:41:35.39 |
+00:05:37.1 |
HIP 37614 |
23.23 |
| 2026-08-09 12:00 |
07:41:38.95 |
+00:05:21.6 |
HIP 37614 |
22.43 |
| 2026-08-10 00:00 |
07:41:42.50 |
+00:05:06.1 |
HIP 37614 |
21.65 |
| 2026-08-10 12:00 |
07:41:46.04 |
+00:04:50.4 |
HIP 37614 |
20.89 |
| 2026-08-11 00:00 |
07:41:49.56 |
+00:04:34.6 |
HIP 37614 |
20.14 |
| 2026-08-11 12:00 |
07:41:53.07 |
+00:04:18.6 |
HIP 37614 |
19.41 |
| 2026-08-12 00:00 |
07:41:56.57 |
+00:04:02.5 |
HIP 37614 |
18.70 |
| 2026-08-12 12:00 |
07:42:00.06 |
+00:03:46.3 |
HIP 37614 |
18.02 |
| 2026-08-13 00:00 |
07:42:03.53 |
+00:03:30.0 |
HIP 37614 |
17.35 |
| 2026-08-13 12:00 |
07:42:06.99 |
+00:03:13.5 |
HIP 37614 |
16.72 |
| 2026-08-14 00:00 |
07:42:10.43 |
+00:02:56.9 |
HIP 37614 |
16.12 |
| 2026-08-14 12:00 |
07:42:13.86 |
+00:02:40.2 |
HIP 37614 |
15.55 |
| 2026-08-15 00:00 |
07:42:17.28 |
+00:02:23.4 |
HIP 37614 |
15.01 |
| 2026-08-15 12:00 |
07:42:20.68 |
+00:02:06.5 |
HIP 37614 |
14.52 |
| 2026-08-16 00:00 |
07:42:24.06 |
+00:01:49.4 |
HIP 37614 |
14.07 |
| 2026-08-16 12:00 |
07:42:27.43 |
+00:01:32.2 |
HIP 37614 |
13.66 |
| 2026-08-17 00:00 |
07:42:30.79 |
+00:01:14.9 |
HIP 37614 |
13.31 |
| 2026-08-17 12:00 |
07:42:34.13 |
+00:00:57.5 |
HIP 37614 |
13.02 |
| 2026-08-18 00:00 |
07:42:37.45 |
+00:00:40.0 |
HIP 37614 |
12.78 |
| 2026-08-18 12:00 |
07:42:40.76 |
+00:00:22.4 |
HIP 37614 |
12.60 |
| 2026-08-19 00:00 |
07:42:44.05 |
+00:00:04.6 |
HIP 37614 |
12.49 |