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) |
| 2026-05-12 00:00 |
23:37:46.58 |
-21:59:03.7 |
HIP 116525 |
12.25 |
| 2026-05-12 12:00 |
23:38:05.94 |
-21:58:56.6 |
HIP 116721 |
16.59 |
| 2026-05-13 00:00 |
23:38:25.21 |
-21:58:50.7 |
HIP 116721 |
12.23 |
| 2026-05-13 12:00 |
23:38:44.40 |
-21:58:45.9 |
HIP 116721 |
8.02 |
| 2026-05-14 00:00 |
23:39:03.51 |
-21:58:42.3 |
HIP 116721 |
4.34 |
| 2026-05-14 12:00 |
23:39:22.54 |
-21:58:39.7 |
HIP 116721 |
3.57 |
| 2026-05-15 00:00 |
23:39:41.48 |
-21:58:38.4 |
HIP 116721 |
6.75 |
| 2026-05-15 12:00 |
23:40:00.33 |
-21:58:38.1 |
HIP 116721 |
10.80 |
| 2026-05-16 00:00 |
23:40:19.10 |
-21:58:39.1 |
HIP 116721 |
15.01 |
| 2026-05-16 12:00 |
23:40:37.77 |
-21:58:41.2 |
HIP 116721 |
19.27 |
| 2026-05-17 00:00 |
23:40:56.36 |
-21:58:44.5 |
HIP 116721 |
23.54 |
| 2026-05-17 12:00 |
23:41:14.86 |
-21:58:48.9 |
HIP 116721 |
27.80 |
| 2026-05-18 00:00 |
23:41:33.27 |
-21:58:54.5 |
HIP 117025 |
30.61 |
| 2026-05-18 12:00 |
23:41:51.59 |
-21:59:01.4 |
HIP 117025 |
27.19 |
| 2026-05-19 00:00 |
23:42:09.82 |
-21:59:09.4 |
HIP 117025 |
24.08 |
| 2026-05-19 12:00 |
23:42:27.95 |
-21:59:18.6 |
HIP 117025 |
21.39 |
| 2026-05-20 00:00 |
23:42:45.99 |
-21:59:29.0 |
HIP 117025 |
19.27 |
| 2026-05-20 12:00 |
23:43:03.93 |
-21:59:40.6 |
HIP 117025 |
17.92 |
| 2026-05-21 00:00 |
23:43:21.78 |
-21:59:53.4 |
HIP 117025 |
17.51 |
| 2026-05-21 12:00 |
23:43:39.54 |
-22:00:07.5 |
HIP 117025 |
18.08 |
| 2026-05-22 00:00 |
23:43:57.19 |
-22:00:22.7 |
HIP 117025 |
19.54 |
| 2026-05-22 12:00 |
23:44:14.75 |
-22:00:39.2 |
HIP 117025 |
21.69 |
| 2026-05-23 00:00 |
23:44:32.21 |
-22:00:56.9 |
HIP 117025 |
24.35 |
| 2026-05-23 12:00 |
23:44:49.58 |
-22:01:15.8 |
HIP 117025 |
27.34 |
| 2026-05-24 00:00 |
23:45:06.84 |
-22:01:36.0 |
HIP 117025 |
30.58 |
| 2026-05-24 12:00 |
23:45:24.00 |
-22:01:57.4 |
HIP 117328 |
31.72 |
| 2026-05-25 00:00 |
23:45:41.06 |
-22:02:20.0 |
HIP 117328 |
28.08 |
| 2026-05-25 12:00 |
23:45:58.02 |
-22:02:43.9 |
HIP 117328 |
24.55 |
| 2026-05-26 00:00 |
23:46:14.88 |
-22:03:09.1 |
HIP 117328 |
21.16 |
| 2026-05-26 12:00 |
23:46:31.63 |
-22:03:35.5 |
HIP 117328 |
18.00 |
| 2026-05-27 00:00 |
23:46:48.28 |
-22:04:03.1 |
HIP 117328 |
15.19 |
| 2026-05-27 12:00 |
23:47:04.82 |
-22:04:32.0 |
HIP 117328 |
12.93 |
| 2026-05-28 00:00 |
23:47:21.26 |
-22:05:02.2 |
HIP 117328 |
11.53 |
| 2026-05-28 12:00 |
23:47:37.59 |
-22:05:33.7 |
HIP 117328 |
11.30 |
| 2026-05-29 00:00 |
23:47:53.82 |
-22:06:06.5 |
HIP 117328 |
12.28 |
| 2026-05-29 12:00 |
23:48:09.93 |
-22:06:40.5 |
HIP 117328 |
14.20 |
| 2026-05-30 00:00 |
23:48:25.94 |
-22:07:15.8 |
HIP 117328 |
16.73 |
| 2026-05-30 12:00 |
23:48:41.84 |
-22:07:52.4 |
HIP 117328 |
19.62 |
| 2026-05-31 00:00 |
23:48:57.62 |
-22:08:30.3 |
HIP 117556 |
21.36 |
| 2026-05-31 12:00 |
23:49:13.30 |
-22:09:09.5 |
HIP 117556 |
17.70 |
| 2026-06-01 00:00 |
23:49:28.86 |
-22:09:50.0 |
HIP 117556 |
14.07 |
| 2026-06-01 12:00 |
23:49:44.31 |
-22:10:31.8 |
HIP 117556 |
10.48 |
| 2026-06-02 00:00 |
23:49:59.65 |
-22:11:15.0 |
HIP 117556 |
6.96 |