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 |
0.989 |
| 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) |
| 2026-09-20 00:00 |
23:39:20.10 |
-31:24:31.3 |
HIP 116659 |
24.99 |
| 2026-09-20 12:00 |
23:39:00.93 |
-31:26:32.4 |
HIP 116659 |
21.51 |
| 2026-09-21 00:00 |
23:38:41.76 |
-31:28:31.4 |
HIP 116659 |
18.53 |
| 2026-09-21 12:00 |
23:38:22.58 |
-31:30:28.4 |
HIP 116659 |
16.32 |
| 2026-09-22 00:00 |
23:38:03.41 |
-31:32:23.2 |
HIP 116546 |
13.72 |
| 2026-09-22 12:00 |
23:37:44.24 |
-31:34:15.8 |
HIP 116546 |
9.31 |
| 2026-09-23 00:00 |
23:37:25.09 |
-31:36:06.3 |
HIP 116546 |
5.08 |
| 2026-09-23 12:00 |
23:37:05.94 |
-31:37:54.6 |
HIP 116546 |
2.27 |
| 2026-09-24 00:00 |
23:36:46.82 |
-31:39:40.7 |
HIP 116546 |
4.91 |
| 2026-09-24 12:00 |
23:36:27.71 |
-31:41:24.6 |
HIP 116546 |
9.07 |
| 2026-09-25 00:00 |
23:36:08.63 |
-31:43:06.3 |
HIP 116546 |
13.38 |
| 2026-09-25 12:00 |
23:35:49.57 |
-31:44:45.8 |
HIP 116546 |
17.72 |
| 2026-09-26 00:00 |
23:35:30.55 |
-31:46:23.0 |
HIP 116539 |
20.98 |
| 2026-09-26 12:00 |
23:35:11.56 |
-31:47:58.0 |
HIP 116539 |
24.55 |
| 2026-09-27 00:00 |
23:34:52.61 |
-31:49:30.7 |
HIP 116235 |
26.70 |
| 2026-09-27 12:00 |
23:34:33.70 |
-31:51:01.1 |
HIP 116235 |
24.06 |
| 2026-09-28 00:00 |
23:34:14.84 |
-31:52:29.3 |
HIP 116235 |
21.93 |
| 2026-09-28 12:00 |
23:33:56.02 |
-31:53:55.1 |
HIP 116235 |
20.46 |
| 2026-09-29 00:00 |
23:33:37.26 |
-31:55:18.7 |
HIP 116235 |
19.77 |
| 2026-09-29 12:00 |
23:33:18.55 |
-31:56:39.9 |
HIP 116235 |
19.94 |
| 2026-09-30 00:00 |
23:32:59.91 |
-31:57:58.7 |
HIP 116189 |
17.47 |
| 2026-09-30 12:00 |
23:32:41.32 |
-31:59:15.3 |
HIP 116189 |
15.18 |
| 2026-10-01 00:00 |
23:32:22.80 |
-32:00:29.5 |
HIP 116189 |
13.81 |
| 2026-10-01 12:00 |
23:32:04.35 |
-32:01:41.3 |
HIP 116189 |
13.63 |
| 2026-10-02 00:00 |
23:31:45.97 |
-32:02:50.8 |
HIP 116189 |
14.66 |
| 2026-10-02 12:00 |
23:31:27.68 |
-32:03:57.9 |
HIP 116189 |
16.65 |
| 2026-10-03 00:00 |
23:31:09.46 |
-32:05:02.6 |
HIP 116189 |
19.29 |
| 2026-10-03 12:00 |
23:30:51.32 |
-32:06:05.0 |
HIP 116189 |
22.34 |
| 2026-10-04 00:00 |
23:30:33.27 |
-32:07:04.9 |
HIP 115914 |
19.03 |
| 2026-10-04 12:00 |
23:30:15.32 |
-32:08:02.4 |
HIP 115914 |
15.12 |
| 2026-10-05 00:00 |
23:29:57.45 |
-32:08:57.5 |
HIP 115914 |
11.24 |
| 2026-10-05 12:00 |
23:29:39.69 |
-32:09:50.3 |
HIP 115914 |
7.40 |
| 2026-10-06 00:00 |
23:29:22.03 |
-32:10:40.5 |
HIP 115914 |
3.64 |
| 2026-10-06 12:00 |
23:29:04.47 |
-32:11:28.4 |
HIP 115914 |
0.96 |
| 2026-10-07 00:00 |
23:28:47.02 |
-32:12:13.8 |
HIP 115914 |
4.15 |
| 2026-10-07 12:00 |
23:28:29.68 |
-32:12:56.8 |
HIP 115914 |
7.83 |
| 2026-10-08 00:00 |
23:28:12.46 |
-32:13:37.4 |
HIP 115914 |
11.51 |
| 2026-10-08 12:00 |
23:27:55.36 |
-32:14:15.5 |
HIP 115914 |
15.17 |
| 2026-10-09 00:00 |
23:27:38.39 |
-32:14:51.1 |
HIP 115914 |
18.80 |
| 2026-10-09 12:00 |
23:27:21.53 |
-32:15:24.4 |
HIP 115659 |
19.55 |
| 2026-10-10 00:00 |
23:27:04.81 |
-32:15:55.1 |
HIP 115659 |
16.03 |
| 2026-10-10 12:00 |
23:26:48.22 |
-32:16:23.5 |
HIP 115659 |
12.57 |
| 2026-10-11 00:00 |
23:26:31.77 |
-32:16:49.4 |
HIP 115659 |
9.19 |