メタデータ
| 項目 |
値 |
| Designation |
C/2016 P4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-10-15T10:34:01.790400Z |
| Orbit solution date (soln_date, UTC) |
2022-06-20T23:12:32Z |
| Obs used |
45 |
| NEO |
- |
| M1 |
7.600 |
| K1 |
14.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-09-18.0000000 |
| e |
0.98170392 |
| q (au) |
5.891877 |
| a (au) |
322.029424 |
| i (deg) |
29.927110 |
| Ω (om, deg) |
320.784742 |
| ω (w, deg) |
355.902036 |
| M (ma, deg) |
359.995320 |
等級
散乱 + 全体線形
$$
M_a = (8.699 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.699 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.617 |
| 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) |
| 2026-06-01 00:00 |
04:43:48.27 |
+48:42:37.3 |
HIP 21800 |
27.80 |
| 2026-06-01 12:00 |
04:43:57.64 |
+48:42:44.5 |
HIP 21800 |
29.35 |
| 2026-06-02 00:00 |
04:44:07.02 |
+48:42:52.0 |
HIP 21800 |
30.90 |
| 2026-06-02 12:00 |
04:44:16.40 |
+48:42:59.8 |
HIP 22041 |
32.45 |
| 2026-06-03 00:00 |
04:44:25.77 |
+48:43:07.8 |
HIP 22041 |
32.58 |
| 2026-06-03 12:00 |
04:44:35.15 |
+48:43:16.1 |
HIP 22041 |
32.79 |
| 2026-06-04 00:00 |
04:44:44.52 |
+48:43:24.6 |
HIP 22041 |
33.08 |
| 2026-06-04 12:00 |
04:44:53.89 |
+48:43:33.4 |
HIP 22041 |
33.44 |
| 2026-06-05 00:00 |
04:45:03.26 |
+48:43:42.4 |
HIP 22041 |
33.87 |
| 2026-06-05 12:00 |
04:45:12.63 |
+48:43:51.7 |
HIP 22041 |
34.37 |
| 2026-06-06 00:00 |
04:45:22.00 |
+48:44:01.2 |
HIP 22331 |
33.76 |
| 2026-06-06 12:00 |
04:45:31.36 |
+48:44:11.0 |
HIP 22331 |
32.36 |
| 2026-06-07 00:00 |
04:45:40.72 |
+48:44:21.0 |
HIP 22331 |
30.99 |
| 2026-06-07 12:00 |
04:45:50.07 |
+48:44:31.3 |
HIP 22331 |
29.63 |
| 2026-06-08 00:00 |
04:45:59.42 |
+48:44:41.8 |
HIP 22331 |
28.29 |
| 2026-06-08 12:00 |
04:46:08.76 |
+48:44:52.6 |
HIP 22331 |
26.98 |
| 2026-06-09 00:00 |
04:46:18.10 |
+48:45:03.6 |
HIP 22331 |
25.71 |
| 2026-06-09 12:00 |
04:46:27.43 |
+48:45:14.8 |
HIP 22331 |
24.46 |
| 2026-06-10 00:00 |
04:46:36.76 |
+48:45:26.3 |
HIP 22331 |
23.26 |
| 2026-06-10 12:00 |
04:46:46.08 |
+48:45:38.1 |
HIP 22331 |
22.10 |
| 2026-06-11 00:00 |
04:46:55.39 |
+48:45:50.1 |
HIP 22331 |
21.00 |
| 2026-06-11 12:00 |
04:47:04.69 |
+48:46:02.3 |
HIP 22331 |
19.96 |
| 2026-06-12 00:00 |
04:47:13.99 |
+48:46:14.8 |
HIP 22331 |
19.00 |
| 2026-06-12 12:00 |
04:47:23.27 |
+48:46:27.5 |
HIP 22331 |
18.12 |
| 2026-06-13 00:00 |
04:47:32.55 |
+48:46:40.4 |
HIP 22331 |
17.34 |
| 2026-06-13 12:00 |
04:47:41.82 |
+48:46:53.6 |
HIP 22331 |
16.67 |
| 2026-06-14 00:00 |
04:47:51.07 |
+48:47:07.1 |
HIP 22331 |
16.13 |
| 2026-06-14 12:00 |
04:48:00.32 |
+48:47:20.7 |
HIP 22331 |
15.72 |
| 2026-06-15 00:00 |
04:48:09.56 |
+48:47:34.6 |
HIP 22331 |
15.47 |
| 2026-06-15 12:00 |
04:48:18.78 |
+48:47:48.8 |
HIP 22331 |
15.37 |
| 2026-06-16 00:00 |
04:48:27.99 |
+48:48:03.2 |
HIP 22331 |
15.43 |
| 2026-06-16 12:00 |
04:48:37.19 |
+48:48:17.8 |
HIP 22331 |
15.64 |
| 2026-06-17 00:00 |
04:48:46.37 |
+48:48:32.6 |
HIP 22331 |
16.00 |
| 2026-06-17 12:00 |
04:48:55.54 |
+48:48:47.7 |
HIP 22331 |
16.50 |
| 2026-06-18 00:00 |
04:49:04.70 |
+48:49:03.0 |
HIP 22331 |
17.13 |
| 2026-06-18 12:00 |
04:49:13.84 |
+48:49:18.6 |
HIP 22331 |
17.87 |
| 2026-06-19 00:00 |
04:49:22.97 |
+48:49:34.4 |
HIP 22545 |
18.26 |
| 2026-06-19 12:00 |
04:49:32.08 |
+48:49:50.4 |
HIP 22545 |
16.91 |
| 2026-06-20 00:00 |
04:49:41.18 |
+48:50:06.6 |
HIP 22545 |
15.59 |
| 2026-06-20 12:00 |
04:49:50.26 |
+48:50:23.0 |
HIP 22545 |
14.32 |
| 2026-06-21 00:00 |
04:49:59.32 |
+48:50:39.7 |
HIP 22545 |
13.10 |
| 2026-06-21 12:00 |
04:50:08.37 |
+48:50:56.6 |
HIP 22545 |
11.96 |
| 2026-06-22 00:00 |
04:50:17.39 |
+48:51:13.8 |
HIP 22545 |
10.92 |