C/2014 A5 (PANSTARRS)
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 |
10.000 |
| 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) |
| 2026-02-03 00:00 |
17:53:59.79 |
-45:51:40.7 |
HIP 87549 |
10.53 |
| 2026-02-03 12:00 |
17:54:05.60 |
-45:51:57.7 |
HIP 87549 |
11.54 |
| 2026-02-04 00:00 |
17:54:11.37 |
-45:52:14.9 |
HIP 87549 |
12.55 |
| 2026-02-04 12:00 |
17:54:17.10 |
-45:52:32.2 |
HIP 87549 |
13.56 |
| 2026-02-05 00:00 |
17:54:22.78 |
-45:52:49.7 |
HIP 87549 |
14.57 |
| 2026-02-05 12:00 |
17:54:28.42 |
-45:53:07.3 |
HIP 87549 |
15.58 |
| 2026-02-06 00:00 |
17:54:34.02 |
-45:53:25.1 |
HIP 87549 |
16.58 |
| 2026-02-06 12:00 |
17:54:39.58 |
-45:53:43.0 |
HIP 87549 |
17.58 |
| 2026-02-07 00:00 |
17:54:45.09 |
-45:54:01.1 |
HIP 87549 |
18.57 |
| 2026-02-07 12:00 |
17:54:50.56 |
-45:54:19.3 |
HIP 87549 |
19.56 |
| 2026-02-08 00:00 |
17:54:55.99 |
-45:54:37.6 |
HIP 87549 |
20.55 |
| 2026-02-08 12:00 |
17:55:01.37 |
-45:54:56.2 |
HIP 87549 |
21.53 |
| 2026-02-09 00:00 |
17:55:06.71 |
-45:55:14.8 |
HIP 87549 |
22.50 |
| 2026-02-09 12:00 |
17:55:12.00 |
-45:55:33.6 |
HIP 87889 |
22.79 |
| 2026-02-10 00:00 |
17:55:17.24 |
-45:55:52.6 |
HIP 87889 |
22.09 |
| 2026-02-10 12:00 |
17:55:22.44 |
-45:56:11.6 |
HIP 87889 |
21.42 |
| 2026-02-11 00:00 |
17:55:27.60 |
-45:56:30.9 |
HIP 87889 |
20.78 |
| 2026-02-11 12:00 |
17:55:32.70 |
-45:56:50.2 |
HIP 87887 |
19.94 |
| 2026-02-12 00:00 |
17:55:37.76 |
-45:57:09.7 |
HIP 87887 |
19.02 |
| 2026-02-12 12:00 |
17:55:42.77 |
-45:57:29.4 |
HIP 87887 |
18.11 |
| 2026-02-13 00:00 |
17:55:47.74 |
-45:57:49.1 |
HIP 87887 |
17.21 |
| 2026-02-13 12:00 |
17:55:52.66 |
-45:58:09.0 |
HIP 87887 |
16.32 |
| 2026-02-14 00:00 |
17:55:57.52 |
-45:58:29.1 |
HIP 87887 |
15.43 |
| 2026-02-14 12:00 |
17:56:02.34 |
-45:58:49.3 |
HIP 87887 |
14.55 |
| 2026-02-15 00:00 |
17:56:07.11 |
-45:59:09.6 |
HIP 87887 |
13.68 |
| 2026-02-15 12:00 |
17:56:11.84 |
-45:59:30.0 |
HIP 87887 |
12.82 |
| 2026-02-16 00:00 |
17:56:16.51 |
-45:59:50.5 |
HIP 87887 |
11.97 |
| 2026-02-16 12:00 |
17:56:21.13 |
-46:00:11.2 |
HIP 87887 |
11.13 |
| 2026-02-17 00:00 |
17:56:25.70 |
-46:00:32.0 |
HIP 87887 |
10.30 |
| 2026-02-17 12:00 |
17:56:30.22 |
-46:00:53.0 |
HIP 87887 |
9.49 |
| 2026-02-18 00:00 |
17:56:34.69 |
-46:01:14.0 |
HIP 87887 |
8.68 |
| 2026-02-18 12:00 |
17:56:39.11 |
-46:01:35.2 |
HIP 87887 |
7.89 |
| 2026-02-19 00:00 |
17:56:43.47 |
-46:01:56.5 |
HIP 87887 |
7.12 |
| 2026-02-19 12:00 |
17:56:47.79 |
-46:02:17.9 |
HIP 87887 |
6.36 |
| 2026-02-20 00:00 |
17:56:52.05 |
-46:02:39.4 |
HIP 87887 |
5.63 |
| 2026-02-20 12:00 |
17:56:56.26 |
-46:03:01.1 |
HIP 87887 |
4.93 |
| 2026-02-21 00:00 |
17:57:00.42 |
-46:03:22.8 |
HIP 87887 |
4.28 |
| 2026-02-21 12:00 |
17:57:04.52 |
-46:03:44.7 |
HIP 87887 |
3.69 |
| 2026-02-22 00:00 |
17:57:08.57 |
-46:04:06.7 |
HIP 87887 |
3.19 |
| 2026-02-22 12:00 |
17:57:12.57 |
-46:04:28.7 |
HIP 87887 |
2.82 |
| 2026-02-23 00:00 |
17:57:16.51 |
-46:04:50.9 |
HIP 87887 |
2.64 |
| 2026-02-23 12:00 |
17:57:20.40 |
-46:05:13.2 |
HIP 87887 |
2.67 |
| 2026-02-24 00:00 |
17:57:24.24 |
-46:05:35.6 |
HIP 87887 |
2.91 |