メタデータ
| 項目 |
値 |
| Designation |
C/2014 A5 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-08-13T12:40:53.086080Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:44:06Z |
| Obs used |
42 |
| NEO |
- |
| M1 |
5.500 |
| K1 |
17.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-08-21.0000000 |
| e |
0.96039227 |
| q (au) |
4.800361 |
| a (au) |
121.197575 |
| i (deg) |
31.993327 |
| Ω (om, deg) |
310.103183 |
| ω (w, deg) |
182.581087 |
| M (ma, deg) |
0.005519 |
等級
散乱 + 全体線形
$$
M_a = (9.124 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.124 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.615 |
| k |
0.800 |
| δ90 |
9.999 |
| 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) |
| 2026-06-01 00:00 |
17:51:47.64 |
-47:10:21.9 |
HIP 87302 |
15.47 |
| 2026-06-01 12:00 |
17:51:41.47 |
-47:10:26.5 |
HIP 87302 |
14.44 |
| 2026-06-02 00:00 |
17:51:35.29 |
-47:10:30.7 |
HIP 87302 |
13.40 |
| 2026-06-02 12:00 |
17:51:29.08 |
-47:10:34.7 |
HIP 87302 |
12.36 |
| 2026-06-03 00:00 |
17:51:22.86 |
-47:10:38.5 |
HIP 87302 |
11.33 |
| 2026-06-03 12:00 |
17:51:16.62 |
-47:10:42.0 |
HIP 87302 |
10.30 |
| 2026-06-04 00:00 |
17:51:10.36 |
-47:10:45.2 |
HIP 87302 |
9.27 |
| 2026-06-04 12:00 |
17:51:04.08 |
-47:10:48.1 |
HIP 87302 |
8.26 |
| 2026-06-05 00:00 |
17:50:57.79 |
-47:10:50.8 |
HIP 87302 |
7.25 |
| 2026-06-05 12:00 |
17:50:51.49 |
-47:10:53.1 |
HIP 87302 |
6.27 |
| 2026-06-06 00:00 |
17:50:45.16 |
-47:10:55.3 |
HIP 87302 |
5.33 |
| 2026-06-06 12:00 |
17:50:38.83 |
-47:10:57.1 |
HIP 87302 |
4.45 |
| 2026-06-07 00:00 |
17:50:32.48 |
-47:10:58.7 |
HIP 87302 |
3.67 |
| 2026-06-07 12:00 |
17:50:26.12 |
-47:11:00.0 |
HIP 87302 |
3.09 |
| 2026-06-08 00:00 |
17:50:19.74 |
-47:11:01.0 |
HIP 87302 |
2.82 |
| 2026-06-08 12:00 |
17:50:13.35 |
-47:11:01.7 |
HIP 87302 |
2.95 |
| 2026-06-09 00:00 |
17:50:06.96 |
-47:11:02.2 |
HIP 87302 |
3.45 |
| 2026-06-09 12:00 |
17:50:00.55 |
-47:11:02.3 |
HIP 87302 |
4.18 |
| 2026-06-10 00:00 |
17:49:54.13 |
-47:11:02.2 |
HIP 87302 |
5.04 |
| 2026-06-10 12:00 |
17:49:47.70 |
-47:11:01.9 |
HIP 87302 |
5.99 |
| 2026-06-11 00:00 |
17:49:41.26 |
-47:11:01.2 |
HIP 87302 |
6.98 |
| 2026-06-11 12:00 |
17:49:34.81 |
-47:11:00.3 |
HIP 87302 |
8.00 |
| 2026-06-12 00:00 |
17:49:28.36 |
-47:10:59.1 |
HIP 87302 |
9.04 |
| 2026-06-12 12:00 |
17:49:21.90 |
-47:10:57.6 |
HIP 87302 |
10.09 |
| 2026-06-13 00:00 |
17:49:15.43 |
-47:10:55.8 |
HIP 87146 |
10.80 |
| 2026-06-13 12:00 |
17:49:08.95 |
-47:10:53.8 |
HIP 87146 |
9.82 |
| 2026-06-14 00:00 |
17:49:02.47 |
-47:10:51.4 |
HIP 87146 |
8.87 |
| 2026-06-14 12:00 |
17:48:55.99 |
-47:10:48.8 |
HIP 87146 |
7.96 |
| 2026-06-15 00:00 |
17:48:49.50 |
-47:10:45.9 |
HIP 87146 |
7.11 |
| 2026-06-15 12:00 |
17:48:43.01 |
-47:10:42.8 |
HIP 87146 |
6.34 |
| 2026-06-16 00:00 |
17:48:36.52 |
-47:10:39.3 |
HIP 87146 |
5.68 |
| 2026-06-16 12:00 |
17:48:30.02 |
-47:10:35.6 |
HIP 87146 |
5.19 |
| 2026-06-17 00:00 |
17:48:23.52 |
-47:10:31.5 |
HIP 87146 |
4.90 |
| 2026-06-17 12:00 |
17:48:17.03 |
-47:10:27.3 |
HIP 87146 |
4.85 |
| 2026-06-18 00:00 |
17:48:10.53 |
-47:10:22.7 |
HIP 87146 |
5.06 |
| 2026-06-18 12:00 |
17:48:04.03 |
-47:10:17.8 |
HIP 87146 |
5.49 |
| 2026-06-19 00:00 |
17:47:57.54 |
-47:10:12.7 |
HIP 87146 |
6.10 |
| 2026-06-19 12:00 |
17:47:51.04 |
-47:10:07.3 |
HIP 87146 |
6.84 |
| 2026-06-20 00:00 |
17:47:44.55 |
-47:10:01.6 |
HIP 87146 |
7.67 |
| 2026-06-20 12:00 |
17:47:38.06 |
-47:09:55.6 |
HIP 87146 |
8.56 |
| 2026-06-21 00:00 |
17:47:31.58 |
-47:09:49.4 |
HIP 87146 |
9.50 |
| 2026-06-21 12:00 |
17:47:25.10 |
-47:09:42.8 |
HIP 87146 |
10.48 |
| 2026-06-22 00:00 |
17:47:18.62 |
-47:09:36.0 |
HIP 87146 |
11.48 |