P/2017 D4 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
P/2017 D4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-09-06T15:17:49.675200Z |
| Orbit solution date (soln_date, UTC) |
2022-07-31T01:43:23Z |
| Obs used |
91 |
| NEO |
- |
| M1 |
16.300 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-03-06.0000000 |
| e |
0.62891585 |
| q (au) |
2.754615 |
| a (au) |
7.423156 |
| i (deg) |
10.339594 |
| Ω (om, deg) |
266.104140 |
| ω (w, deg) |
209.796281 |
| M (ma, deg) |
8.789572 |
等級
散乱 + 全体線形
$$
M_a = (15.387 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.387 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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 |
19:37:44.88 |
-17:00:25.8 |
HIP 96666 |
21.73 |
| 2026-02-03 12:00 |
19:37:55.23 |
-16:59:53.4 |
HIP 96666 |
19.20 |
| 2026-02-04 00:00 |
19:38:05.54 |
-16:59:20.9 |
HIP 96666 |
16.68 |
| 2026-02-04 12:00 |
19:38:15.83 |
-16:58:48.3 |
HIP 96666 |
14.17 |
| 2026-02-05 00:00 |
19:38:26.09 |
-16:58:15.7 |
HIP 96666 |
11.67 |
| 2026-02-05 12:00 |
19:38:36.33 |
-16:57:43.0 |
HIP 96666 |
9.18 |
| 2026-02-06 00:00 |
19:38:46.53 |
-16:57:10.3 |
HIP 96666 |
6.71 |
| 2026-02-06 12:00 |
19:38:56.71 |
-16:56:37.5 |
HIP 96666 |
4.27 |
| 2026-02-07 00:00 |
19:39:06.86 |
-16:56:04.6 |
HIP 96666 |
2.01 |
| 2026-02-07 12:00 |
19:39:16.97 |
-16:55:31.7 |
HIP 96667 |
1.43 |
| 2026-02-08 00:00 |
19:39:27.06 |
-16:54:58.8 |
HIP 96667 |
3.41 |
| 2026-02-08 12:00 |
19:39:37.11 |
-16:54:25.8 |
HIP 96667 |
5.78 |
| 2026-02-09 00:00 |
19:39:47.13 |
-16:53:52.8 |
HIP 96779 |
7.33 |
| 2026-02-09 12:00 |
19:39:57.12 |
-16:53:19.7 |
HIP 96779 |
4.88 |
| 2026-02-10 00:00 |
19:40:07.08 |
-16:52:46.5 |
HIP 96779 |
2.46 |
| 2026-02-10 12:00 |
19:40:17.00 |
-16:52:13.4 |
HIP 96779 |
0.47 |
| 2026-02-11 00:00 |
19:40:26.89 |
-16:51:40.2 |
HIP 96779 |
2.50 |
| 2026-02-11 12:00 |
19:40:36.75 |
-16:51:06.9 |
HIP 96779 |
4.90 |
| 2026-02-12 00:00 |
19:40:46.57 |
-16:50:33.6 |
HIP 96779 |
7.30 |
| 2026-02-12 12:00 |
19:40:56.36 |
-16:50:00.3 |
HIP 96779 |
9.71 |
| 2026-02-13 00:00 |
19:41:06.10 |
-16:49:27.0 |
HIP 96779 |
12.10 |
| 2026-02-13 12:00 |
19:41:15.82 |
-16:48:53.6 |
HIP 96779 |
14.49 |
| 2026-02-14 00:00 |
19:41:25.49 |
-16:48:20.2 |
HIP 96779 |
16.87 |
| 2026-02-14 12:00 |
19:41:35.13 |
-16:47:46.8 |
HIP 96779 |
19.24 |
| 2026-02-15 00:00 |
19:41:44.73 |
-16:47:13.3 |
HIP 96779 |
21.61 |
| 2026-02-15 12:00 |
19:41:54.29 |
-16:46:39.9 |
HIP 96779 |
23.96 |
| 2026-02-16 00:00 |
19:42:03.81 |
-16:46:06.4 |
HIP 96779 |
26.31 |
| 2026-02-16 12:00 |
19:42:13.29 |
-16:45:32.9 |
HIP 96779 |
28.65 |
| 2026-02-17 00:00 |
19:42:22.73 |
-16:44:59.3 |
HIP 96779 |
30.97 |
| 2026-02-17 12:00 |
19:42:32.13 |
-16:44:25.8 |
HIP 96779 |
33.29 |
| 2026-02-18 00:00 |
19:42:41.49 |
-16:43:52.2 |
HIP 96779 |
35.60 |
| 2026-02-18 12:00 |
19:42:50.81 |
-16:43:18.7 |
HIP 96950 |
36.18 |
| 2026-02-19 00:00 |
19:43:00.08 |
-16:42:45.1 |
HIP 96950 |
35.99 |
| 2026-02-19 12:00 |
19:43:09.31 |
-16:42:11.5 |
HIP 96950 |
35.94 |
| 2026-02-20 00:00 |
19:43:18.50 |
-16:41:38.0 |
HIP 96950 |
36.03 |
| 2026-02-20 12:00 |
19:43:27.64 |
-16:41:04.4 |
HIP 96950 |
36.27 |
| 2026-02-21 00:00 |
19:43:36.74 |
-16:40:30.8 |
HIP 96950 |
36.63 |
| 2026-02-21 12:00 |
19:43:45.79 |
-16:39:57.2 |
HIP 96950 |
37.12 |
| 2026-02-22 00:00 |
19:43:54.80 |
-16:39:23.7 |
HIP 96950 |
37.74 |
| 2026-02-22 12:00 |
19:44:03.76 |
-16:38:50.1 |
HIP 96950 |
38.47 |
| 2026-02-23 00:00 |
19:44:12.68 |
-16:38:16.5 |
HIP 96950 |
39.30 |
| 2026-02-23 12:00 |
19:44:21.54 |
-16:37:43.0 |
HIP 97303 |
40.17 |
| 2026-02-24 00:00 |
19:44:30.36 |
-16:37:09.5 |
HIP 97303 |
38.19 |