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) |
| 2026-07-29 00:00 |
05:00:07.23 |
+49:21:30.4 |
HIP 23367 |
27.36 |
| 2026-07-29 12:00 |
05:00:13.75 |
+49:22:01.3 |
HIP 23367 |
27.33 |
| 2026-07-30 00:00 |
05:00:20.22 |
+49:22:32.3 |
HIP 23367 |
27.36 |
| 2026-07-30 12:00 |
05:00:26.64 |
+49:23:03.5 |
HIP 23367 |
27.44 |
| 2026-07-31 00:00 |
05:00:33.02 |
+49:23:34.7 |
HIP 23367 |
27.58 |
| 2026-07-31 12:00 |
05:00:39.34 |
+49:24:06.1 |
HIP 23367 |
27.77 |
| 2026-08-01 00:00 |
05:00:45.62 |
+49:24:37.7 |
HIP 23367 |
28.01 |
| 2026-08-01 12:00 |
05:00:51.85 |
+49:25:09.4 |
HIP 23367 |
28.30 |
| 2026-08-02 00:00 |
05:00:58.02 |
+49:25:41.2 |
HIP 23367 |
28.63 |
| 2026-08-02 12:00 |
05:01:04.14 |
+49:26:13.1 |
HIP 23367 |
29.01 |
| 2026-08-03 00:00 |
05:01:10.22 |
+49:26:45.1 |
HIP 23568 |
28.22 |
| 2026-08-03 12:00 |
05:01:16.24 |
+49:27:17.3 |
HIP 23568 |
27.18 |
| 2026-08-04 00:00 |
05:01:22.21 |
+49:27:49.6 |
HIP 23568 |
26.15 |
| 2026-08-04 12:00 |
05:01:28.12 |
+49:28:22.0 |
HIP 23568 |
25.14 |
| 2026-08-05 00:00 |
05:01:33.99 |
+49:28:54.5 |
HIP 23568 |
24.15 |
| 2026-08-05 12:00 |
05:01:39.80 |
+49:29:27.2 |
HIP 23568 |
23.17 |
| 2026-08-06 00:00 |
05:01:45.56 |
+49:30:00.0 |
HIP 23568 |
22.21 |
| 2026-08-06 12:00 |
05:01:51.26 |
+49:30:32.8 |
HIP 23568 |
21.28 |
| 2026-08-07 00:00 |
05:01:56.91 |
+49:31:05.8 |
HIP 23568 |
20.36 |
| 2026-08-07 12:00 |
05:02:02.51 |
+49:31:38.9 |
HIP 23568 |
19.48 |
| 2026-08-08 00:00 |
05:02:08.05 |
+49:32:12.1 |
HIP 23568 |
18.62 |
| 2026-08-08 12:00 |
05:02:13.53 |
+49:32:45.4 |
HIP 23568 |
17.79 |
| 2026-08-09 00:00 |
05:02:18.96 |
+49:33:18.8 |
HIP 23568 |
16.99 |
| 2026-08-09 12:00 |
05:02:24.34 |
+49:33:52.3 |
HIP 23568 |
16.23 |
| 2026-08-10 00:00 |
05:02:29.65 |
+49:34:26.0 |
HIP 23568 |
15.52 |
| 2026-08-10 12:00 |
05:02:34.91 |
+49:34:59.7 |
HIP 23568 |
14.85 |
| 2026-08-11 00:00 |
05:02:40.11 |
+49:35:33.5 |
HIP 23568 |
14.23 |
| 2026-08-11 12:00 |
05:02:45.26 |
+49:36:07.4 |
HIP 23568 |
13.67 |
| 2026-08-12 00:00 |
05:02:50.34 |
+49:36:41.4 |
HIP 23568 |
13.17 |
| 2026-08-12 12:00 |
05:02:55.37 |
+49:37:15.5 |
HIP 23568 |
12.74 |
| 2026-08-13 00:00 |
05:03:00.34 |
+49:37:49.7 |
HIP 23568 |
12.38 |
| 2026-08-13 12:00 |
05:03:05.25 |
+49:38:24.0 |
HIP 23568 |
12.10 |
| 2026-08-14 00:00 |
05:03:10.10 |
+49:38:58.4 |
HIP 23568 |
11.91 |
| 2026-08-14 12:00 |
05:03:14.89 |
+49:39:32.8 |
HIP 23568 |
11.80 |
| 2026-08-15 00:00 |
05:03:19.62 |
+49:40:07.4 |
HIP 23568 |
11.77 |
| 2026-08-15 12:00 |
05:03:24.29 |
+49:40:42.0 |
HIP 23568 |
11.83 |
| 2026-08-16 00:00 |
05:03:28.90 |
+49:41:16.7 |
HIP 23609 |
11.18 |
| 2026-08-16 12:00 |
05:03:33.45 |
+49:41:51.5 |
HIP 23609 |
10.34 |
| 2026-08-17 00:00 |
05:03:37.94 |
+49:42:26.3 |
HIP 23609 |
9.52 |
| 2026-08-17 12:00 |
05:03:42.36 |
+49:43:01.2 |
HIP 23609 |
8.73 |
| 2026-08-18 00:00 |
05:03:46.73 |
+49:43:36.2 |
HIP 23609 |
7.98 |
| 2026-08-18 12:00 |
05:03:51.03 |
+49:44:11.2 |
HIP 23609 |
7.29 |
| 2026-08-19 00:00 |
05:03:55.27 |
+49:44:46.4 |
HIP 23609 |
6.65 |