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) |
| 2026-03-26 00:00 |
04:25:59.14 |
+49:07:51.4 |
HIP 20565 |
18.16 |
| 2026-03-26 12:00 |
04:26:04.43 |
+49:07:21.7 |
HIP 20565 |
19.15 |
| 2026-03-27 00:00 |
04:26:09.78 |
+49:06:52.2 |
HIP 20565 |
20.15 |
| 2026-03-27 12:00 |
04:26:15.18 |
+49:06:23.0 |
HIP 20565 |
21.16 |
| 2026-03-28 00:00 |
04:26:20.64 |
+49:05:54.0 |
HIP 20796 |
21.08 |
| 2026-03-28 12:00 |
04:26:26.16 |
+49:05:25.3 |
HIP 20796 |
20.23 |
| 2026-03-29 00:00 |
04:26:31.74 |
+49:04:56.9 |
HIP 20796 |
19.40 |
| 2026-03-29 12:00 |
04:26:37.37 |
+49:04:28.7 |
HIP 20796 |
18.59 |
| 2026-03-30 00:00 |
04:26:43.06 |
+49:04:00.8 |
HIP 20796 |
17.80 |
| 2026-03-30 12:00 |
04:26:48.80 |
+49:03:33.2 |
HIP 20796 |
17.04 |
| 2026-03-31 00:00 |
04:26:54.60 |
+49:03:05.8 |
HIP 20796 |
16.31 |
| 2026-03-31 12:00 |
04:27:00.46 |
+49:02:38.7 |
HIP 20796 |
15.63 |
| 2026-04-01 00:00 |
04:27:06.37 |
+49:02:11.8 |
HIP 20796 |
14.99 |
| 2026-04-01 12:00 |
04:27:12.34 |
+49:01:45.2 |
HIP 20796 |
14.40 |
| 2026-04-02 00:00 |
04:27:18.36 |
+49:01:18.9 |
HIP 20796 |
13.88 |
| 2026-04-02 12:00 |
04:27:24.43 |
+49:00:52.9 |
HIP 20796 |
13.43 |
| 2026-04-03 00:00 |
04:27:30.55 |
+49:00:27.1 |
HIP 20796 |
13.06 |
| 2026-04-03 12:00 |
04:27:36.73 |
+49:00:01.6 |
HIP 20796 |
12.78 |
| 2026-04-04 00:00 |
04:27:42.96 |
+48:59:36.4 |
HIP 20796 |
12.60 |
| 2026-04-04 12:00 |
04:27:49.25 |
+48:59:11.4 |
HIP 20796 |
12.52 |
| 2026-04-05 00:00 |
04:27:55.58 |
+48:58:46.7 |
HIP 20796 |
12.54 |
| 2026-04-05 12:00 |
04:28:01.97 |
+48:58:22.3 |
HIP 20796 |
12.68 |
| 2026-04-06 00:00 |
04:28:08.41 |
+48:57:58.2 |
HIP 20796 |
12.92 |
| 2026-04-06 12:00 |
04:28:14.90 |
+48:57:34.3 |
HIP 20796 |
13.26 |
| 2026-04-07 00:00 |
04:28:21.44 |
+48:57:10.7 |
HIP 20796 |
13.69 |
| 2026-04-07 12:00 |
04:28:28.03 |
+48:56:47.4 |
HIP 20796 |
14.22 |
| 2026-04-08 00:00 |
04:28:34.66 |
+48:56:24.3 |
HIP 20796 |
14.83 |
| 2026-04-08 12:00 |
04:28:41.35 |
+48:56:01.6 |
HIP 20796 |
15.50 |
| 2026-04-09 00:00 |
04:28:48.09 |
+48:55:39.1 |
HIP 20796 |
16.25 |
| 2026-04-09 12:00 |
04:28:54.87 |
+48:55:16.9 |
HIP 20796 |
17.05 |
| 2026-04-10 00:00 |
04:29:01.70 |
+48:54:54.9 |
HIP 20796 |
17.90 |
| 2026-04-10 12:00 |
04:29:08.58 |
+48:54:33.3 |
HIP 20796 |
18.80 |
| 2026-04-11 00:00 |
04:29:15.51 |
+48:54:11.9 |
HIP 20796 |
19.73 |
| 2026-04-11 12:00 |
04:29:22.49 |
+48:53:50.8 |
HIP 20796 |
20.70 |
| 2026-04-12 00:00 |
04:29:29.51 |
+48:53:30.0 |
HIP 20796 |
21.71 |
| 2026-04-12 12:00 |
04:29:36.57 |
+48:53:09.5 |
HIP 20796 |
22.74 |
| 2026-04-13 00:00 |
04:29:43.68 |
+48:52:49.2 |
HIP 20796 |
23.80 |
| 2026-04-13 12:00 |
04:29:50.84 |
+48:52:29.3 |
HIP 20796 |
24.88 |
| 2026-04-14 00:00 |
04:29:58.04 |
+48:52:09.6 |
HIP 20796 |
25.98 |
| 2026-04-14 12:00 |
04:30:05.29 |
+48:51:50.2 |
HIP 20796 |
27.10 |
| 2026-04-15 00:00 |
04:30:12.58 |
+48:51:31.1 |
HIP 20796 |
28.24 |
| 2026-04-15 12:00 |
04:30:19.91 |
+48:51:12.3 |
HIP 20796 |
29.39 |
| 2026-04-16 00:00 |
04:30:27.29 |
+48:50:53.7 |
HIP 20796 |
30.56 |