メタデータ
| 項目 |
値 |
| Designation |
C/2014 W6 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-03-19T00:07:11.818560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:03Z |
| Obs used |
139 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-01-30.0000000 |
| e |
1.00174154 |
| q (au) |
3.087625 |
| a (au) |
-1772.929151 |
| i (deg) |
53.564298 |
| Ω (om, deg) |
338.129791 |
| ω (w, deg) |
209.854804 |
| M (ma, deg) |
-0.000634 |
等級
散乱 + 全体線形
$$
M_a = (12.657 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.657 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.501 |
| 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) |
| 2026-09-20 00:00 |
22:24:50.78 |
-19:21:36.0 |
HIP 110750 |
22.05 |
| 2026-09-20 12:00 |
22:24:46.66 |
-19:21:47.9 |
HIP 110750 |
23.00 |
| 2026-09-21 00:00 |
22:24:42.56 |
-19:21:59.5 |
HIP 110750 |
23.95 |
| 2026-09-21 12:00 |
22:24:38.49 |
-19:22:11.0 |
HIP 110750 |
24.90 |
| 2026-09-22 00:00 |
22:24:34.43 |
-19:22:22.3 |
HIP 110750 |
25.84 |
| 2026-09-22 12:00 |
22:24:30.38 |
-19:22:33.4 |
HIP 110475 |
26.30 |
| 2026-09-23 00:00 |
22:24:26.36 |
-19:22:44.3 |
HIP 110475 |
25.36 |
| 2026-09-23 12:00 |
22:24:22.35 |
-19:22:55.0 |
HIP 110475 |
24.43 |
| 2026-09-24 00:00 |
22:24:18.37 |
-19:23:05.5 |
HIP 110475 |
23.51 |
| 2026-09-24 12:00 |
22:24:14.40 |
-19:23:15.8 |
HIP 110475 |
22.60 |
| 2026-09-25 00:00 |
22:24:10.46 |
-19:23:26.0 |
HIP 110475 |
21.69 |
| 2026-09-25 12:00 |
22:24:06.53 |
-19:23:35.9 |
HIP 110475 |
20.79 |
| 2026-09-26 00:00 |
22:24:02.63 |
-19:23:45.6 |
HIP 110475 |
19.90 |
| 2026-09-26 12:00 |
22:23:58.74 |
-19:23:55.1 |
HIP 110475 |
19.02 |
| 2026-09-27 00:00 |
22:23:54.88 |
-19:24:04.5 |
HIP 110475 |
18.14 |
| 2026-09-27 12:00 |
22:23:51.04 |
-19:24:13.6 |
HIP 110475 |
17.28 |
| 2026-09-28 00:00 |
22:23:47.22 |
-19:24:22.5 |
HIP 110475 |
16.42 |
| 2026-09-28 12:00 |
22:23:43.42 |
-19:24:31.2 |
HIP 110475 |
15.58 |
| 2026-09-29 00:00 |
22:23:39.65 |
-19:24:39.8 |
HIP 110475 |
14.75 |
| 2026-09-29 12:00 |
22:23:35.90 |
-19:24:48.1 |
HIP 110475 |
13.93 |
| 2026-09-30 00:00 |
22:23:32.17 |
-19:24:56.2 |
HIP 110475 |
13.13 |
| 2026-09-30 12:00 |
22:23:28.46 |
-19:25:04.1 |
HIP 110475 |
12.34 |
| 2026-10-01 00:00 |
22:23:24.78 |
-19:25:11.8 |
HIP 110475 |
11.57 |
| 2026-10-01 12:00 |
22:23:21.12 |
-19:25:19.2 |
HIP 110475 |
10.82 |
| 2026-10-02 00:00 |
22:23:17.48 |
-19:25:26.5 |
HIP 110475 |
10.09 |
| 2026-10-02 12:00 |
22:23:13.87 |
-19:25:33.6 |
HIP 110475 |
9.39 |
| 2026-10-03 00:00 |
22:23:10.29 |
-19:25:40.4 |
HIP 110475 |
8.72 |
| 2026-10-03 12:00 |
22:23:06.73 |
-19:25:47.1 |
HIP 110475 |
8.09 |
| 2026-10-04 00:00 |
22:23:03.19 |
-19:25:53.5 |
HIP 110475 |
7.51 |
| 2026-10-04 12:00 |
22:22:59.68 |
-19:25:59.7 |
HIP 110475 |
6.98 |
| 2026-10-05 00:00 |
22:22:56.20 |
-19:26:05.7 |
HIP 110475 |
6.51 |
| 2026-10-05 12:00 |
22:22:52.74 |
-19:26:11.5 |
HIP 110475 |
6.12 |
| 2026-10-06 00:00 |
22:22:49.31 |
-19:26:17.0 |
HIP 110475 |
5.82 |
| 2026-10-06 12:00 |
22:22:45.90 |
-19:26:22.3 |
HIP 110475 |
5.62 |
| 2026-10-07 00:00 |
22:22:42.53 |
-19:26:27.5 |
HIP 110475 |
5.53 |
| 2026-10-07 12:00 |
22:22:39.18 |
-19:26:32.4 |
HIP 110475 |
5.55 |
| 2026-10-08 00:00 |
22:22:35.86 |
-19:26:37.0 |
HIP 110475 |
5.68 |
| 2026-10-08 12:00 |
22:22:32.56 |
-19:26:41.5 |
HIP 110475 |
5.91 |
| 2026-10-09 00:00 |
22:22:29.30 |
-19:26:45.7 |
HIP 110475 |
6.22 |
| 2026-10-09 12:00 |
22:22:26.06 |
-19:26:49.7 |
HIP 110424 |
6.19 |
| 2026-10-10 00:00 |
22:22:22.85 |
-19:26:53.5 |
HIP 110424 |
5.45 |
| 2026-10-10 12:00 |
22:22:19.68 |
-19:26:57.1 |
HIP 110424 |
4.72 |
| 2026-10-11 00:00 |
22:22:16.53 |
-19:27:00.4 |
HIP 110424 |
4.00 |