C/2015 F4 (Jacques)
メタデータ
| 項目 |
値 |
| Designation |
C/2015 F4 (Jacques) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-08-10T20:42:31.959360Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:44:08Z |
| Obs used |
2837 |
| NEO |
- |
| M1 |
11.300 |
| K1 |
9.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-08-22.0000000 |
| e |
0.98587145 |
| q (au) |
1.643925 |
| a (au) |
116.354874 |
| i (deg) |
48.704931 |
| Ω (om, deg) |
285.958058 |
| ω (w, deg) |
36.346505 |
| M (ma, deg) |
0.008746 |
等級
散乱 + 全体線形
$$
M_a = (13.074 + 3.299\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.074 |
| n |
3.299 |
| gf |
1.000 |
| gb |
-0.617 |
| k |
0.800 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2015-03-27 |
2015-08-10 |
-1.7989 |
+0.136 |
| 2015-08-10 |
2015-10-17 |
+10.5578 |
-2.762 |
| 2015-10-17 |
2016-11-06 |
-2.7024 |
+1.182 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
07:24:13.96 |
+15:41:10.6 |
HIP 35933 |
10.67 |
| 2026-02-03 12:00 |
07:24:09.47 |
+15:41:19.2 |
HIP 35933 |
11.18 |
| 2026-02-04 00:00 |
07:24:05.01 |
+15:41:27.9 |
HIP 35933 |
11.77 |
| 2026-02-04 12:00 |
07:24:00.56 |
+15:41:36.6 |
HIP 35933 |
12.43 |
| 2026-02-05 00:00 |
07:23:56.14 |
+15:41:45.3 |
HIP 35818 |
12.99 |
| 2026-02-05 12:00 |
07:23:51.74 |
+15:41:54.0 |
HIP 35818 |
12.09 |
| 2026-02-06 00:00 |
07:23:47.36 |
+15:42:02.7 |
HIP 35818 |
11.22 |
| 2026-02-06 12:00 |
07:23:43.01 |
+15:42:11.4 |
HIP 35818 |
10.39 |
| 2026-02-07 00:00 |
07:23:38.68 |
+15:42:20.2 |
HIP 35818 |
9.61 |
| 2026-02-07 12:00 |
07:23:34.37 |
+15:42:28.9 |
HIP 35818 |
8.89 |
| 2026-02-08 00:00 |
07:23:30.08 |
+15:42:37.7 |
HIP 35818 |
8.24 |
| 2026-02-08 12:00 |
07:23:25.82 |
+15:42:46.5 |
HIP 35818 |
7.68 |
| 2026-02-09 00:00 |
07:23:21.59 |
+15:42:55.3 |
HIP 35818 |
7.22 |
| 2026-02-09 12:00 |
07:23:17.38 |
+15:43:04.1 |
HIP 35818 |
6.90 |
| 2026-02-10 00:00 |
07:23:13.19 |
+15:43:12.9 |
HIP 35818 |
6.71 |
| 2026-02-10 12:00 |
07:23:09.03 |
+15:43:21.7 |
HIP 35818 |
6.68 |
| 2026-02-11 00:00 |
07:23:04.89 |
+15:43:30.5 |
HIP 35818 |
6.79 |
| 2026-02-11 12:00 |
07:23:00.79 |
+15:43:39.3 |
HIP 35818 |
7.05 |
| 2026-02-12 00:00 |
07:22:56.70 |
+15:43:48.1 |
HIP 35818 |
7.42 |
| 2026-02-12 12:00 |
07:22:52.65 |
+15:43:56.9 |
HIP 35818 |
7.90 |
| 2026-02-13 00:00 |
07:22:48.62 |
+15:44:05.7 |
HIP 35818 |
8.47 |
| 2026-02-13 12:00 |
07:22:44.62 |
+15:44:14.5 |
HIP 35818 |
9.10 |
| 2026-02-14 00:00 |
07:22:40.65 |
+15:44:23.3 |
HIP 35818 |
9.78 |
| 2026-02-14 12:00 |
07:22:36.71 |
+15:44:32.1 |
HIP 35818 |
10.50 |
| 2026-02-15 00:00 |
07:22:32.79 |
+15:44:40.9 |
HIP 35818 |
11.25 |
| 2026-02-15 12:00 |
07:22:28.91 |
+15:44:49.7 |
HIP 35818 |
12.02 |
| 2026-02-16 00:00 |
07:22:25.05 |
+15:44:58.5 |
HIP 35818 |
12.81 |
| 2026-02-16 12:00 |
07:22:21.23 |
+15:45:07.2 |
HIP 35818 |
13.61 |
| 2026-02-17 00:00 |
07:22:17.43 |
+15:45:16.0 |
HIP 35818 |
14.42 |
| 2026-02-17 12:00 |
07:22:13.66 |
+15:45:24.8 |
HIP 35818 |
15.24 |
| 2026-02-18 00:00 |
07:22:09.93 |
+15:45:33.5 |
HIP 35818 |
16.06 |
| 2026-02-18 12:00 |
07:22:06.22 |
+15:45:42.2 |
HIP 35818 |
16.88 |
| 2026-02-19 00:00 |
07:22:02.55 |
+15:45:50.9 |
HIP 35818 |
17.70 |
| 2026-02-19 12:00 |
07:21:58.91 |
+15:45:59.6 |
HIP 35818 |
18.53 |
| 2026-02-20 00:00 |
07:21:55.30 |
+15:46:08.3 |
HIP 35818 |
19.35 |
| 2026-02-20 12:00 |
07:21:51.73 |
+15:46:17.0 |
HIP 35818 |
20.16 |
| 2026-02-21 00:00 |
07:21:48.18 |
+15:46:25.6 |
HIP 35818 |
20.98 |
| 2026-02-21 12:00 |
07:21:44.67 |
+15:46:34.3 |
HIP 35818 |
21.79 |
| 2026-02-22 00:00 |
07:21:41.19 |
+15:46:42.9 |
HIP 35818 |
22.59 |
| 2026-02-22 12:00 |
07:21:37.75 |
+15:46:51.5 |
HIP 35818 |
23.40 |
| 2026-02-23 00:00 |
07:21:34.34 |
+15:47:00.0 |
HIP 35818 |
24.19 |
| 2026-02-23 12:00 |
07:21:30.96 |
+15:47:08.6 |
HIP 35818 |
24.98 |
| 2026-02-24 00:00 |
07:21:27.62 |
+15:47:17.1 |
HIP 35818 |
25.77 |