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) |
| 2026-07-29 00:00 |
22:32:30.95 |
-18:48:46.4 |
HIP 111406 |
24.75 |
| 2026-07-29 12:00 |
22:32:27.06 |
-18:49:07.9 |
HIP 111406 |
25.73 |
| 2026-07-30 00:00 |
22:32:23.15 |
-18:49:29.3 |
HIP 111406 |
26.72 |
| 2026-07-30 12:00 |
22:32:19.22 |
-18:49:50.8 |
HIP 111406 |
27.72 |
| 2026-07-31 00:00 |
22:32:15.27 |
-18:50:12.3 |
HIP 111406 |
28.72 |
| 2026-07-31 12:00 |
22:32:11.30 |
-18:50:33.8 |
HIP 111406 |
29.72 |
| 2026-08-01 00:00 |
22:32:07.32 |
-18:50:55.3 |
HIP 111406 |
30.73 |
| 2026-08-01 12:00 |
22:32:03.31 |
-18:51:16.9 |
HIP 111406 |
31.74 |
| 2026-08-02 00:00 |
22:31:59.29 |
-18:51:38.4 |
HIP 111406 |
32.76 |
| 2026-08-02 12:00 |
22:31:55.24 |
-18:52:00.0 |
HIP 111406 |
33.78 |
| 2026-08-03 00:00 |
22:31:51.18 |
-18:52:21.5 |
HIP 111406 |
34.81 |
| 2026-08-03 12:00 |
22:31:47.10 |
-18:52:43.0 |
HIP 111406 |
35.84 |
| 2026-08-04 00:00 |
22:31:43.01 |
-18:53:04.6 |
HIP 111321 |
36.39 |
| 2026-08-04 12:00 |
22:31:38.89 |
-18:53:26.1 |
HIP 111158 |
36.27 |
| 2026-08-05 00:00 |
22:31:34.76 |
-18:53:47.7 |
HIP 111158 |
35.76 |
| 2026-08-05 12:00 |
22:31:30.62 |
-18:54:09.2 |
HIP 111158 |
35.26 |
| 2026-08-06 00:00 |
22:31:26.45 |
-18:54:30.8 |
HIP 111158 |
34.80 |
| 2026-08-06 12:00 |
22:31:22.27 |
-18:54:52.3 |
HIP 111158 |
34.35 |
| 2026-08-07 00:00 |
22:31:18.08 |
-18:55:13.8 |
HIP 111158 |
33.94 |
| 2026-08-07 12:00 |
22:31:13.87 |
-18:55:35.3 |
HIP 111158 |
33.55 |
| 2026-08-08 00:00 |
22:31:09.64 |
-18:55:56.7 |
HIP 111158 |
33.19 |
| 2026-08-08 12:00 |
22:31:05.40 |
-18:56:18.2 |
HIP 111158 |
32.87 |
| 2026-08-09 00:00 |
22:31:01.15 |
-18:56:39.6 |
HIP 111158 |
32.57 |
| 2026-08-09 12:00 |
22:30:56.88 |
-18:57:01.0 |
HIP 111158 |
32.31 |
| 2026-08-10 00:00 |
22:30:52.60 |
-18:57:22.4 |
HIP 111158 |
32.08 |
| 2026-08-10 12:00 |
22:30:48.31 |
-18:57:43.7 |
HIP 110961 |
31.47 |
| 2026-08-11 00:00 |
22:30:44.00 |
-18:58:05.1 |
HIP 110961 |
30.74 |
| 2026-08-11 12:00 |
22:30:39.68 |
-18:58:26.3 |
HIP 110961 |
30.02 |
| 2026-08-12 00:00 |
22:30:35.35 |
-18:58:47.6 |
HIP 110961 |
29.32 |
| 2026-08-12 12:00 |
22:30:31.01 |
-18:59:08.8 |
HIP 110961 |
28.65 |
| 2026-08-13 00:00 |
22:30:26.65 |
-18:59:29.9 |
HIP 110961 |
27.99 |
| 2026-08-13 12:00 |
22:30:22.29 |
-18:59:51.1 |
HIP 110961 |
27.37 |
| 2026-08-14 00:00 |
22:30:17.91 |
-19:00:12.1 |
HIP 110961 |
26.77 |
| 2026-08-14 12:00 |
22:30:13.52 |
-19:00:33.2 |
HIP 110961 |
26.20 |
| 2026-08-15 00:00 |
22:30:09.13 |
-19:00:54.1 |
HIP 110961 |
25.66 |
| 2026-08-15 12:00 |
22:30:04.72 |
-19:01:15.0 |
HIP 110961 |
25.16 |
| 2026-08-16 00:00 |
22:30:00.31 |
-19:01:35.9 |
HIP 110961 |
24.69 |
| 2026-08-16 12:00 |
22:29:55.88 |
-19:01:56.7 |
HIP 110961 |
24.26 |
| 2026-08-17 00:00 |
22:29:51.45 |
-19:02:17.4 |
HIP 110961 |
23.88 |
| 2026-08-17 12:00 |
22:29:47.01 |
-19:02:38.1 |
HIP 110961 |
23.53 |
| 2026-08-18 00:00 |
22:29:42.57 |
-19:02:58.7 |
HIP 110961 |
23.24 |
| 2026-08-18 12:00 |
22:29:38.11 |
-19:03:19.3 |
HIP 110961 |
22.99 |
| 2026-08-19 00:00 |
22:29:33.65 |
-19:03:39.8 |
HIP 110961 |
22.79 |