メタデータ
| 項目 |
値 |
| Designation |
C/2013 P4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-08-12T09:25:24.268800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:39Z |
| Obs used |
229 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
10.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-07-13.0000000 |
| e |
0.59605993 |
| q (au) |
5.967053 |
| a (au) |
14.772125 |
| i (deg) |
4.264367 |
| Ω (om, deg) |
256.614561 |
| ω (w, deg) |
113.559028 |
| M (ma, deg) |
359.472396 |
等級
散乱 + 全体線形
$$
M_a = (2.562 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
2.562 |
| n |
6.000 |
| gf |
0.994 |
| gb |
-0.977 |
| k |
1.000 |
| δ90 |
9.957 |
| 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) |
| 2026-05-12 00:00 |
09:47:32.54 |
+08:58:24.0 |
HIP 48146 |
19.91 |
| 2026-05-12 12:00 |
09:47:33.27 |
+08:58:27.4 |
HIP 48146 |
19.73 |
| 2026-05-13 00:00 |
09:47:34.06 |
+08:58:30.5 |
HIP 48146 |
19.53 |
| 2026-05-13 12:00 |
09:47:34.89 |
+08:58:33.3 |
HIP 48146 |
19.33 |
| 2026-05-14 00:00 |
09:47:35.78 |
+08:58:35.8 |
HIP 48146 |
19.11 |
| 2026-05-14 12:00 |
09:47:36.73 |
+08:58:38.0 |
HIP 48146 |
18.87 |
| 2026-05-15 00:00 |
09:47:37.73 |
+08:58:39.9 |
HIP 48146 |
18.63 |
| 2026-05-15 12:00 |
09:47:38.78 |
+08:58:41.6 |
HIP 48146 |
18.37 |
| 2026-05-16 00:00 |
09:47:39.89 |
+08:58:42.9 |
HIP 48146 |
18.09 |
| 2026-05-16 12:00 |
09:47:41.05 |
+08:58:44.0 |
HIP 48146 |
17.81 |
| 2026-05-17 00:00 |
09:47:42.27 |
+08:58:44.8 |
HIP 48146 |
17.51 |
| 2026-05-17 12:00 |
09:47:43.54 |
+08:58:45.2 |
HIP 48146 |
17.19 |
| 2026-05-18 00:00 |
09:47:44.86 |
+08:58:45.4 |
HIP 48146 |
16.87 |
| 2026-05-18 12:00 |
09:47:46.24 |
+08:58:45.3 |
HIP 48146 |
16.53 |
| 2026-05-19 00:00 |
09:47:47.67 |
+08:58:44.9 |
HIP 48146 |
16.17 |
| 2026-05-19 12:00 |
09:47:49.15 |
+08:58:44.3 |
HIP 48146 |
15.81 |
| 2026-05-20 00:00 |
09:47:50.69 |
+08:58:43.3 |
HIP 48146 |
15.43 |
| 2026-05-20 12:00 |
09:47:52.27 |
+08:58:42.0 |
HIP 48146 |
15.03 |
| 2026-05-21 00:00 |
09:47:53.92 |
+08:58:40.5 |
HIP 48146 |
14.63 |
| 2026-05-21 12:00 |
09:47:55.61 |
+08:58:38.6 |
HIP 48146 |
14.21 |
| 2026-05-22 00:00 |
09:47:57.36 |
+08:58:36.5 |
HIP 48146 |
13.78 |
| 2026-05-22 12:00 |
09:47:59.16 |
+08:58:34.1 |
HIP 48146 |
13.33 |
| 2026-05-23 00:00 |
09:48:01.01 |
+08:58:31.4 |
HIP 48146 |
12.88 |
| 2026-05-23 12:00 |
09:48:02.91 |
+08:58:28.4 |
HIP 48146 |
12.41 |
| 2026-05-24 00:00 |
09:48:04.87 |
+08:58:25.1 |
HIP 48146 |
11.92 |
| 2026-05-24 12:00 |
09:48:06.87 |
+08:58:21.5 |
HIP 48146 |
11.43 |
| 2026-05-25 00:00 |
09:48:08.93 |
+08:58:17.7 |
HIP 48146 |
10.92 |
| 2026-05-25 12:00 |
09:48:11.04 |
+08:58:13.5 |
HIP 48146 |
10.40 |
| 2026-05-26 00:00 |
09:48:13.20 |
+08:58:09.1 |
HIP 48146 |
9.87 |
| 2026-05-26 12:00 |
09:48:15.41 |
+08:58:04.4 |
HIP 48146 |
9.33 |
| 2026-05-27 00:00 |
09:48:17.67 |
+08:57:59.4 |
HIP 48146 |
8.77 |
| 2026-05-27 12:00 |
09:48:19.98 |
+08:57:54.1 |
HIP 48146 |
8.21 |
| 2026-05-28 00:00 |
09:48:22.35 |
+08:57:48.6 |
HIP 48146 |
7.64 |
| 2026-05-28 12:00 |
09:48:24.76 |
+08:57:42.7 |
HIP 48146 |
7.05 |
| 2026-05-29 00:00 |
09:48:27.22 |
+08:57:36.6 |
HIP 48146 |
6.46 |
| 2026-05-29 12:00 |
09:48:29.73 |
+08:57:30.2 |
HIP 48146 |
5.86 |
| 2026-05-30 00:00 |
09:48:32.29 |
+08:57:23.5 |
HIP 48146 |
5.26 |
| 2026-05-30 12:00 |
09:48:34.90 |
+08:57:16.5 |
HIP 48146 |
4.66 |
| 2026-05-31 00:00 |
09:48:37.56 |
+08:57:09.3 |
HIP 48146 |
4.07 |
| 2026-05-31 12:00 |
09:48:40.27 |
+08:57:01.8 |
HIP 48146 |
3.49 |
| 2026-06-01 00:00 |
09:48:43.03 |
+08:56:54.0 |
HIP 48146 |
2.95 |
| 2026-06-01 12:00 |
09:48:45.83 |
+08:56:45.9 |
HIP 48146 |
2.48 |
| 2026-06-02 00:00 |
09:48:48.69 |
+08:56:37.5 |
HIP 48146 |
2.15 |