メタデータ
| 項目 |
値 |
| Designation |
C/2014 F1 (Hill) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-10-04T20:00:02.148480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:50Z |
| Obs used |
190 |
| NEO |
- |
| M1 |
13.700 |
| 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) |
2014-04-19.0000000 |
| e |
0.99907518 |
| q (au) |
3.496337 |
| a (au) |
3780.558013 |
| i (deg) |
108.253050 |
| Ω (om, deg) |
239.902413 |
| ω (w, deg) |
8.242943 |
| M (ma, deg) |
0.000832 |
等級
散乱 + 全体線形
$$
M_a = (12.874 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.874 |
| n |
2.000 |
| gf |
0.801 |
| 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) |
| 2026-09-20 00:00 |
04:25:24.18 |
+53:35:24.1 |
HIP 20694 |
12.74 |
| 2026-09-20 12:00 |
04:25:21.59 |
+53:35:46.8 |
HIP 20694 |
12.55 |
| 2026-09-21 00:00 |
04:25:18.94 |
+53:36:09.4 |
HIP 20694 |
12.39 |
| 2026-09-21 12:00 |
04:25:16.23 |
+53:36:31.8 |
HIP 20694 |
12.26 |
| 2026-09-22 00:00 |
04:25:13.46 |
+53:36:54.0 |
HIP 20694 |
12.16 |
| 2026-09-22 12:00 |
04:25:10.64 |
+53:37:16.1 |
HIP 20694 |
12.08 |
| 2026-09-23 00:00 |
04:25:07.76 |
+53:37:37.9 |
HIP 20694 |
12.05 |
| 2026-09-23 12:00 |
04:25:04.81 |
+53:37:59.7 |
HIP 20694 |
12.04 |
| 2026-09-24 00:00 |
04:25:01.82 |
+53:38:21.2 |
HIP 20541 |
12.03 |
| 2026-09-24 12:00 |
04:24:58.76 |
+53:38:42.6 |
HIP 20541 |
11.98 |
| 2026-09-25 00:00 |
04:24:55.64 |
+53:39:03.8 |
HIP 20541 |
11.95 |
| 2026-09-25 12:00 |
04:24:52.47 |
+53:39:24.8 |
HIP 20541 |
11.95 |
| 2026-09-26 00:00 |
04:24:49.24 |
+53:39:45.6 |
HIP 20541 |
11.96 |
| 2026-09-26 12:00 |
04:24:45.96 |
+53:40:06.2 |
HIP 20541 |
12.00 |
| 2026-09-27 00:00 |
04:24:42.62 |
+53:40:26.7 |
HIP 20541 |
12.06 |
| 2026-09-27 12:00 |
04:24:39.22 |
+53:40:46.9 |
HIP 20541 |
12.14 |
| 2026-09-28 00:00 |
04:24:35.76 |
+53:41:07.0 |
HIP 20541 |
12.25 |
| 2026-09-28 12:00 |
04:24:32.25 |
+53:41:26.9 |
HIP 20541 |
12.38 |
| 2026-09-29 00:00 |
04:24:28.68 |
+53:41:46.5 |
HIP 20541 |
12.54 |
| 2026-09-29 12:00 |
04:24:25.05 |
+53:42:06.0 |
HIP 20541 |
12.71 |
| 2026-09-30 00:00 |
04:24:21.37 |
+53:42:25.2 |
HIP 20541 |
12.92 |
| 2026-09-30 12:00 |
04:24:17.63 |
+53:42:44.3 |
HIP 20541 |
13.14 |
| 2026-10-01 00:00 |
04:24:13.84 |
+53:43:03.2 |
HIP 20541 |
13.39 |
| 2026-10-01 12:00 |
04:24:09.99 |
+53:43:21.8 |
HIP 20541 |
13.66 |
| 2026-10-02 00:00 |
04:24:06.09 |
+53:43:40.2 |
HIP 20541 |
13.95 |
| 2026-10-02 12:00 |
04:24:02.13 |
+53:43:58.4 |
HIP 20541 |
14.26 |
| 2026-10-03 00:00 |
04:23:58.12 |
+53:44:16.4 |
HIP 20541 |
14.59 |
| 2026-10-03 12:00 |
04:23:54.05 |
+53:44:34.2 |
HIP 20541 |
14.94 |
| 2026-10-04 00:00 |
04:23:49.93 |
+53:44:51.7 |
HIP 20541 |
15.31 |
| 2026-10-04 12:00 |
04:23:45.75 |
+53:45:09.1 |
HIP 20541 |
15.70 |
| 2026-10-05 00:00 |
04:23:41.52 |
+53:45:26.2 |
HIP 20541 |
16.11 |
| 2026-10-05 12:00 |
04:23:37.23 |
+53:45:43.0 |
HIP 20541 |
16.53 |
| 2026-10-06 00:00 |
04:23:32.90 |
+53:45:59.7 |
HIP 20541 |
16.97 |
| 2026-10-06 12:00 |
04:23:28.51 |
+53:46:16.1 |
HIP 20541 |
17.42 |
| 2026-10-07 00:00 |
04:23:24.06 |
+53:46:32.2 |
HIP 20541 |
17.89 |
| 2026-10-07 12:00 |
04:23:19.56 |
+53:46:48.2 |
HIP 20332 |
18.09 |
| 2026-10-08 00:00 |
04:23:15.01 |
+53:47:03.8 |
HIP 20332 |
17.51 |
| 2026-10-08 12:00 |
04:23:10.41 |
+53:47:19.3 |
HIP 20332 |
16.94 |
| 2026-10-09 00:00 |
04:23:05.76 |
+53:47:34.4 |
HIP 20332 |
16.37 |
| 2026-10-09 12:00 |
04:23:01.05 |
+53:47:49.4 |
HIP 20332 |
15.80 |
| 2026-10-10 00:00 |
04:22:56.30 |
+53:48:04.1 |
HIP 20332 |
15.24 |
| 2026-10-10 12:00 |
04:22:51.49 |
+53:48:18.5 |
HIP 20332 |
14.69 |
| 2026-10-11 00:00 |
04:22:46.63 |
+53:48:32.7 |
HIP 20332 |
14.15 |