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 |
0.999 |
| 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) |
| 2026-06-01 00:00 |
19:51:18.11 |
-15:29:34.2 |
HIP 97620 |
12.94 |
| 2026-06-01 12:00 |
19:51:12.68 |
-15:29:34.3 |
HIP 97620 |
11.71 |
| 2026-06-02 00:00 |
19:51:07.18 |
-15:29:34.6 |
HIP 97620 |
10.49 |
| 2026-06-02 12:00 |
19:51:01.61 |
-15:29:35.2 |
HIP 97620 |
9.28 |
| 2026-06-03 00:00 |
19:50:55.97 |
-15:29:36.0 |
HIP 97620 |
8.10 |
| 2026-06-03 12:00 |
19:50:50.27 |
-15:29:37.1 |
HIP 97620 |
6.98 |
| 2026-06-04 00:00 |
19:50:44.51 |
-15:29:38.5 |
HIP 97620 |
5.95 |
| 2026-06-04 12:00 |
19:50:38.67 |
-15:29:40.0 |
HIP 97620 |
5.10 |
| 2026-06-05 00:00 |
19:50:32.78 |
-15:29:41.8 |
HIP 97620 |
4.52 |
| 2026-06-05 12:00 |
19:50:26.82 |
-15:29:43.9 |
HIP 97620 |
4.36 |
| 2026-06-06 00:00 |
19:50:20.79 |
-15:29:46.2 |
HIP 97620 |
4.67 |
| 2026-06-06 12:00 |
19:50:14.71 |
-15:29:48.7 |
HIP 97620 |
5.38 |
| 2026-06-07 00:00 |
19:50:08.56 |
-15:29:51.5 |
HIP 97620 |
6.37 |
| 2026-06-07 12:00 |
19:50:02.35 |
-15:29:54.5 |
HIP 97620 |
7.53 |
| 2026-06-08 00:00 |
19:49:56.08 |
-15:29:57.7 |
HIP 97620 |
8.81 |
| 2026-06-08 12:00 |
19:49:49.74 |
-15:30:01.2 |
HIP 97620 |
10.17 |
| 2026-06-09 00:00 |
19:49:43.35 |
-15:30:04.9 |
HIP 97620 |
11.59 |
| 2026-06-09 12:00 |
19:49:36.90 |
-15:30:08.9 |
HIP 97620 |
13.05 |
| 2026-06-10 00:00 |
19:49:30.38 |
-15:30:13.1 |
HIP 97620 |
14.55 |
| 2026-06-10 12:00 |
19:49:23.81 |
-15:30:17.5 |
HIP 97620 |
16.07 |
| 2026-06-11 00:00 |
19:49:17.18 |
-15:30:22.1 |
HIP 97620 |
17.62 |
| 2026-06-11 12:00 |
19:49:10.49 |
-15:30:27.0 |
HIP 97620 |
19.19 |
| 2026-06-12 00:00 |
19:49:03.75 |
-15:30:32.2 |
HIP 97620 |
20.78 |
| 2026-06-12 12:00 |
19:48:56.95 |
-15:30:37.5 |
HIP 97620 |
22.39 |
| 2026-06-13 00:00 |
19:48:50.09 |
-15:30:43.1 |
HIP 97620 |
24.02 |
| 2026-06-13 12:00 |
19:48:43.18 |
-15:30:48.9 |
HIP 97620 |
25.67 |
| 2026-06-14 00:00 |
19:48:36.22 |
-15:30:54.9 |
HIP 97620 |
27.33 |
| 2026-06-14 12:00 |
19:48:29.20 |
-15:31:01.2 |
HIP 97620 |
29.01 |
| 2026-06-15 00:00 |
19:48:22.13 |
-15:31:07.7 |
HIP 97620 |
30.70 |
| 2026-06-15 12:00 |
19:48:15.00 |
-15:31:14.4 |
HIP 97273 |
32.34 |
| 2026-06-16 00:00 |
19:48:07.83 |
-15:31:21.3 |
HIP 97273 |
30.76 |
| 2026-06-16 12:00 |
19:48:00.60 |
-15:31:28.4 |
HIP 97273 |
29.20 |
| 2026-06-17 00:00 |
19:47:53.33 |
-15:31:35.8 |
HIP 97273 |
27.65 |
| 2026-06-17 12:00 |
19:47:46.00 |
-15:31:43.4 |
HIP 97273 |
26.11 |
| 2026-06-18 00:00 |
19:47:38.63 |
-15:31:51.2 |
HIP 97273 |
24.60 |
| 2026-06-18 12:00 |
19:47:31.21 |
-15:31:59.2 |
HIP 97273 |
23.12 |
| 2026-06-19 00:00 |
19:47:23.75 |
-15:32:07.4 |
HIP 97273 |
21.67 |
| 2026-06-19 12:00 |
19:47:16.23 |
-15:32:15.9 |
HIP 97273 |
20.28 |
| 2026-06-20 00:00 |
19:47:08.68 |
-15:32:24.5 |
HIP 97273 |
18.96 |
| 2026-06-20 12:00 |
19:47:01.07 |
-15:32:33.4 |
HIP 97273 |
17.72 |
| 2026-06-21 00:00 |
19:46:53.43 |
-15:32:42.4 |
HIP 97273 |
16.59 |
| 2026-06-21 12:00 |
19:46:45.74 |
-15:32:51.7 |
HIP 97273 |
15.59 |
| 2026-06-22 00:00 |
19:46:38.01 |
-15:33:01.1 |
HIP 97273 |
14.75 |