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) |
| 2026-03-26 00:00 |
23:03:02.15 |
-23:19:07.6 |
HIP 113972 |
27.43 |
| 2026-03-26 12:00 |
23:03:26.15 |
-23:17:41.8 |
HIP 113972 |
21.78 |
| 2026-03-27 00:00 |
23:03:50.13 |
-23:16:16.5 |
HIP 113972 |
16.16 |
| 2026-03-27 12:00 |
23:04:14.09 |
-23:14:51.9 |
HIP 113972 |
10.62 |
| 2026-03-28 00:00 |
23:04:38.03 |
-23:13:27.9 |
HIP 113972 |
5.40 |
| 2026-03-28 12:00 |
23:05:01.95 |
-23:12:04.4 |
HIP 113972 |
3.17 |
| 2026-03-29 00:00 |
23:05:25.84 |
-23:10:41.5 |
HIP 113972 |
7.43 |
| 2026-03-29 12:00 |
23:05:49.70 |
-23:09:19.3 |
HIP 113972 |
12.82 |
| 2026-03-30 00:00 |
23:06:13.55 |
-23:07:57.6 |
HIP 114156 |
12.38 |
| 2026-03-30 12:00 |
23:06:37.36 |
-23:06:36.6 |
HIP 114156 |
7.40 |
| 2026-03-31 00:00 |
23:07:01.16 |
-23:05:16.1 |
HIP 114156 |
4.46 |
| 2026-03-31 12:00 |
23:07:24.92 |
-23:03:56.3 |
HIP 114156 |
6.95 |
| 2026-04-01 00:00 |
23:07:48.66 |
-23:02:37.2 |
HIP 114156 |
11.82 |
| 2026-04-01 12:00 |
23:08:12.37 |
-23:01:18.6 |
HIP 114156 |
17.14 |
| 2026-04-02 00:00 |
23:08:36.06 |
-23:00:00.7 |
HIP 114359 |
15.82 |
| 2026-04-02 12:00 |
23:08:59.71 |
-22:58:43.4 |
HIP 114359 |
11.73 |
| 2026-04-03 00:00 |
23:09:23.34 |
-22:57:26.8 |
HIP 114359 |
9.33 |
| 2026-04-03 12:00 |
23:09:46.94 |
-22:56:10.8 |
HIP 114359 |
9.94 |
| 2026-04-04 00:00 |
23:10:10.51 |
-22:54:55.5 |
HIP 114387 |
11.68 |
| 2026-04-04 12:00 |
23:10:34.05 |
-22:53:40.8 |
HIP 114387 |
14.99 |
| 2026-04-05 00:00 |
23:10:57.55 |
-22:52:26.8 |
HIP 114387 |
19.35 |
| 2026-04-05 12:00 |
23:11:21.03 |
-22:51:13.5 |
HIP 114572 |
19.42 |
| 2026-04-06 00:00 |
23:11:44.47 |
-22:50:00.8 |
HIP 114572 |
15.69 |
| 2026-04-06 12:00 |
23:12:07.89 |
-22:48:48.9 |
HIP 114572 |
13.27 |
| 2026-04-07 00:00 |
23:12:31.27 |
-22:47:37.6 |
HIP 114572 |
12.91 |
| 2026-04-07 12:00 |
23:12:54.61 |
-22:46:27.0 |
HIP 114572 |
14.76 |
| 2026-04-08 00:00 |
23:13:17.92 |
-22:45:17.1 |
HIP 114572 |
18.13 |
| 2026-04-08 12:00 |
23:13:41.20 |
-22:44:08.0 |
HIP 114572 |
22.35 |
| 2026-04-09 00:00 |
23:14:04.44 |
-22:42:59.5 |
HIP 114572 |
27.02 |
| 2026-04-09 12:00 |
23:14:27.64 |
-22:41:51.8 |
HIP 114572 |
31.93 |
| 2026-04-10 00:00 |
23:14:50.81 |
-22:40:44.8 |
HIP 114572 |
36.98 |
| 2026-04-10 12:00 |
23:15:13.94 |
-22:39:38.5 |
HIP 114999 |
32.40 |
| 2026-04-11 00:00 |
23:15:37.03 |
-22:38:33.0 |
HIP 114999 |
27.73 |
| 2026-04-11 12:00 |
23:16:00.09 |
-22:37:28.2 |
HIP 114999 |
23.38 |
| 2026-04-12 00:00 |
23:16:23.10 |
-22:36:24.2 |
HIP 114999 |
19.59 |
| 2026-04-12 12:00 |
23:16:46.08 |
-22:35:20.9 |
HIP 114999 |
16.70 |
| 2026-04-13 00:00 |
23:17:09.01 |
-22:34:18.4 |
HIP 114999 |
15.25 |
| 2026-04-13 12:00 |
23:17:31.90 |
-22:33:16.6 |
HIP 114999 |
15.60 |
| 2026-04-14 00:00 |
23:17:54.75 |
-22:32:15.7 |
HIP 114999 |
17.66 |
| 2026-04-14 12:00 |
23:18:17.56 |
-22:31:15.5 |
HIP 114999 |
20.91 |
| 2026-04-15 00:00 |
23:18:40.32 |
-22:30:16.1 |
HIP 115103 |
22.38 |
| 2026-04-15 12:00 |
23:19:03.04 |
-22:29:17.5 |
HIP 115103 |
21.51 |
| 2026-04-16 00:00 |
23:19:25.72 |
-22:28:19.7 |
HIP 115103 |
21.95 |