メタデータ
| 項目 |
値 |
| Designation |
C/2013 V4 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-10-07T13:40:00.877440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:42Z |
| Obs used |
2445 |
| NEO |
- |
| M1 |
6.000 |
| K1 |
9.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-08-24.0000000 |
| e |
1.00261035 |
| q (au) |
5.185419 |
| a (au) |
-1986.485935 |
| i (deg) |
67.854449 |
| Ω (om, deg) |
55.620501 |
| ω (w, deg) |
40.445881 |
| M (ma, deg) |
-0.000496 |
等級
散乱 + 全体線形
$$
M_a = (7.035 + 2.740\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.035 |
| n |
2.740 |
| gf |
0.850 |
| gb |
-0.970 |
| k |
1.000 |
| δ90 |
6.315 |
| 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) |
| 2026-06-01 00:00 |
15:20:45.86 |
-02:22:38.1 |
HIP 75101 |
2.17 |
| 2026-06-01 12:00 |
15:20:41.13 |
-02:22:37.5 |
HIP 75101 |
2.63 |
| 2026-06-02 00:00 |
15:20:36.41 |
-02:22:37.1 |
HIP 75101 |
3.45 |
| 2026-06-02 12:00 |
15:20:31.71 |
-02:22:36.9 |
HIP 75101 |
4.42 |
| 2026-06-03 00:00 |
15:20:27.03 |
-02:22:37.0 |
HIP 75101 |
5.47 |
| 2026-06-03 12:00 |
15:20:22.36 |
-02:22:37.3 |
HIP 75101 |
6.56 |
| 2026-06-04 00:00 |
15:20:17.71 |
-02:22:37.8 |
HIP 75101 |
7.66 |
| 2026-06-04 12:00 |
15:20:13.08 |
-02:22:38.6 |
HIP 75101 |
8.78 |
| 2026-06-05 00:00 |
15:20:08.47 |
-02:22:39.5 |
HIP 75101 |
9.90 |
| 2026-06-05 12:00 |
15:20:03.87 |
-02:22:40.7 |
HIP 75101 |
11.02 |
| 2026-06-06 00:00 |
15:19:59.29 |
-02:22:42.2 |
HIP 75101 |
12.14 |
| 2026-06-06 12:00 |
15:19:54.73 |
-02:22:43.8 |
HIP 75101 |
13.26 |
| 2026-06-07 00:00 |
15:19:50.19 |
-02:22:45.7 |
HIP 75101 |
14.38 |
| 2026-06-07 12:00 |
15:19:45.67 |
-02:22:47.8 |
HIP 74972 |
14.94 |
| 2026-06-08 00:00 |
15:19:41.16 |
-02:22:50.2 |
HIP 74972 |
14.42 |
| 2026-06-08 12:00 |
15:19:36.68 |
-02:22:52.8 |
HIP 74972 |
13.98 |
| 2026-06-09 00:00 |
15:19:32.22 |
-02:22:55.6 |
HIP 74972 |
13.63 |
| 2026-06-09 12:00 |
15:19:27.78 |
-02:22:58.6 |
HIP 74972 |
13.36 |
| 2026-06-10 00:00 |
15:19:23.36 |
-02:23:01.9 |
HIP 74972 |
13.19 |
| 2026-06-10 12:00 |
15:19:18.96 |
-02:23:05.4 |
HIP 74972 |
13.11 |
| 2026-06-11 00:00 |
15:19:14.58 |
-02:23:09.2 |
HIP 74972 |
13.13 |
| 2026-06-11 12:00 |
15:19:10.23 |
-02:23:13.2 |
HIP 74972 |
13.24 |
| 2026-06-12 00:00 |
15:19:05.90 |
-02:23:17.4 |
HIP 74972 |
13.44 |
| 2026-06-12 12:00 |
15:19:01.59 |
-02:23:21.8 |
HIP 74972 |
13.73 |
| 2026-06-13 00:00 |
15:18:57.30 |
-02:23:26.5 |
HIP 74972 |
14.10 |
| 2026-06-13 12:00 |
15:18:53.04 |
-02:23:31.4 |
HIP 74972 |
14.54 |
| 2026-06-14 00:00 |
15:18:48.80 |
-02:23:36.6 |
HIP 74972 |
15.04 |
| 2026-06-14 12:00 |
15:18:44.58 |
-02:23:42.0 |
HIP 74972 |
15.60 |
| 2026-06-15 00:00 |
15:18:40.39 |
-02:23:47.6 |
HIP 74972 |
16.21 |
| 2026-06-15 12:00 |
15:18:36.23 |
-02:23:53.5 |
HIP 74972 |
16.86 |
| 2026-06-16 00:00 |
15:18:32.09 |
-02:23:59.6 |
HIP 74972 |
17.55 |
| 2026-06-16 12:00 |
15:18:27.98 |
-02:24:06.0 |
HIP 74972 |
18.27 |
| 2026-06-17 00:00 |
15:18:23.89 |
-02:24:12.6 |
HIP 74972 |
19.02 |
| 2026-06-17 12:00 |
15:18:19.83 |
-02:24:19.4 |
HIP 74972 |
19.79 |
| 2026-06-18 00:00 |
15:18:15.79 |
-02:24:26.5 |
HIP 74972 |
20.59 |
| 2026-06-18 12:00 |
15:18:11.78 |
-02:24:33.7 |
HIP 74972 |
21.40 |
| 2026-06-19 00:00 |
15:18:07.80 |
-02:24:41.3 |
HIP 74972 |
22.22 |
| 2026-06-19 12:00 |
15:18:03.85 |
-02:24:49.1 |
HIP 74972 |
23.05 |
| 2026-06-20 00:00 |
15:17:59.92 |
-02:24:57.1 |
HIP 74972 |
23.90 |
| 2026-06-20 12:00 |
15:17:56.02 |
-02:25:05.3 |
HIP 74972 |
24.75 |
| 2026-06-21 00:00 |
15:17:52.15 |
-02:25:13.8 |
HIP 74972 |
25.60 |
| 2026-06-21 12:00 |
15:17:48.31 |
-02:25:22.5 |
HIP 74924 |
25.94 |
| 2026-06-22 00:00 |
15:17:44.50 |
-02:25:31.4 |
HIP 74924 |
26.29 |