P/2014 A2 (Hill)
メタデータ
| 項目 |
値 |
| Designation |
P/2014 A2 (Hill) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-10-28T08:06:33.264000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:44Z |
| Obs used |
123 |
| NEO |
- |
| M1 |
17.000 |
| 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) |
2014-01-19.0000000 |
| e |
0.64983414 |
| q (au) |
2.074675 |
| a (au) |
5.924835 |
| i (deg) |
24.513480 |
| Ω (om, deg) |
106.672024 |
| ω (w, deg) |
356.226385 |
| M (ma, deg) |
5.649321 |
等級
散乱 + 全体線形
$$
M_a = (14.070 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.070 |
| n |
6.000 |
| gf |
0.990 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
3.155 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
22:22:12.00 |
-26:20:10.0 |
HIP 110577 |
25.75 |
| 2026-02-03 12:00 |
22:22:34.96 |
-26:18:11.4 |
HIP 110577 |
20.94 |
| 2026-02-04 00:00 |
22:22:57.97 |
-26:16:12.9 |
HIP 110576 |
15.46 |
| 2026-02-04 12:00 |
22:23:21.02 |
-26:14:14.5 |
HIP 110576 |
9.95 |
| 2026-02-05 00:00 |
22:23:44.12 |
-26:12:16.2 |
HIP 110576 |
4.50 |
| 2026-02-05 12:00 |
22:24:07.25 |
-26:10:18.0 |
HIP 110576 |
1.68 |
| 2026-02-06 00:00 |
22:24:30.42 |
-26:08:19.9 |
HIP 110576 |
6.87 |
| 2026-02-06 12:00 |
22:24:53.64 |
-26:06:21.9 |
HIP 110576 |
12.39 |
| 2026-02-07 00:00 |
22:25:16.89 |
-26:04:24.0 |
HIP 110576 |
17.95 |
| 2026-02-07 12:00 |
22:25:40.18 |
-26:02:26.2 |
HIP 110576 |
23.53 |
| 2026-02-08 00:00 |
22:26:03.51 |
-26:00:28.6 |
HIP 110744 |
26.39 |
| 2026-02-08 12:00 |
22:26:26.87 |
-25:58:31.1 |
HIP 110744 |
24.69 |
| 2026-02-09 00:00 |
22:26:50.27 |
-25:56:33.7 |
HIP 110922 |
21.09 |
| 2026-02-09 12:00 |
22:27:13.71 |
-25:54:36.4 |
HIP 110922 |
15.68 |
| 2026-02-10 00:00 |
22:27:37.18 |
-25:52:39.3 |
HIP 110922 |
10.49 |
| 2026-02-10 12:00 |
22:28:00.68 |
-25:50:42.3 |
HIP 110922 |
6.12 |
| 2026-02-11 00:00 |
22:28:24.22 |
-25:48:45.5 |
HIP 110922 |
5.32 |
| 2026-02-11 12:00 |
22:28:47.79 |
-25:46:48.8 |
HIP 110922 |
9.10 |
| 2026-02-12 00:00 |
22:29:11.40 |
-25:44:52.3 |
HIP 110922 |
14.19 |
| 2026-02-12 12:00 |
22:29:35.04 |
-25:42:55.9 |
HIP 110922 |
19.60 |
| 2026-02-13 00:00 |
22:29:58.70 |
-25:40:59.8 |
HIP 110922 |
25.12 |
| 2026-02-13 12:00 |
22:30:22.40 |
-25:39:03.7 |
HIP 111138 |
26.31 |
| 2026-02-14 00:00 |
22:30:46.13 |
-25:37:07.9 |
HIP 111138 |
27.34 |
| 2026-02-14 12:00 |
22:31:09.88 |
-25:35:12.2 |
HIP 111138 |
29.44 |
| 2026-02-15 00:00 |
22:31:33.67 |
-25:33:16.8 |
HIP 111370 |
30.32 |
| 2026-02-15 12:00 |
22:31:57.48 |
-25:31:21.5 |
HIP 111370 |
25.70 |
| 2026-02-16 00:00 |
22:32:21.31 |
-25:29:26.4 |
HIP 111370 |
21.58 |
| 2026-02-16 12:00 |
22:32:45.18 |
-25:27:31.5 |
HIP 111370 |
18.33 |
| 2026-02-17 00:00 |
22:33:09.07 |
-25:25:36.8 |
HIP 111391 |
16.09 |
| 2026-02-17 12:00 |
22:33:32.98 |
-25:23:42.3 |
HIP 111391 |
11.11 |
| 2026-02-18 00:00 |
22:33:56.92 |
-25:21:48.1 |
HIP 111391 |
7.35 |
| 2026-02-18 12:00 |
22:34:20.88 |
-25:19:54.0 |
HIP 111391 |
7.09 |
| 2026-02-19 00:00 |
22:34:44.86 |
-25:18:00.2 |
HIP 111391 |
10.61 |
| 2026-02-19 12:00 |
22:35:08.87 |
-25:16:06.6 |
HIP 111391 |
15.53 |
| 2026-02-20 00:00 |
22:35:32.89 |
-25:14:13.3 |
HIP 111391 |
20.88 |
| 2026-02-20 12:00 |
22:35:56.94 |
-25:12:20.2 |
HIP 111703 |
23.71 |
| 2026-02-21 00:00 |
22:36:21.00 |
-25:10:27.3 |
HIP 111703 |
18.16 |
| 2026-02-21 12:00 |
22:36:45.09 |
-25:08:34.7 |
HIP 111703 |
12.78 |
| 2026-02-22 00:00 |
22:37:09.19 |
-25:06:42.4 |
HIP 111703 |
7.96 |
| 2026-02-22 12:00 |
22:37:33.31 |
-25:04:50.3 |
HIP 111703 |
5.46 |
| 2026-02-23 00:00 |
22:37:57.44 |
-25:02:58.5 |
HIP 111742 |
5.99 |
| 2026-02-23 12:00 |
22:38:21.59 |
-25:01:06.9 |
HIP 111742 |
7.99 |
| 2026-02-24 00:00 |
22:38:45.76 |
-24:59:15.7 |
HIP 111742 |
12.59 |