メタデータ
| 項目 |
値 |
| Designation |
P/2017 B4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-01-28T02:53:29.515200Z |
| Orbit solution date (soln_date, UTC) |
2026-03-31T09:42:32Z |
| Obs used |
124 |
| NEO |
- |
| M1 |
15.000 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-09-01.0000000 |
| e |
0.36178487 |
| q (au) |
2.796849 |
| a (au) |
4.382297 |
| i (deg) |
20.447212 |
| Ω (om, deg) |
120.712150 |
| ω (w, deg) |
16.557333 |
| M (ma, deg) |
101.621855 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-28 00:00 |
10:32:41.04 |
+27:20:55.7 |
HIP 51664 |
26.80 |
| 2026-05-28 12:00 |
10:33:10.05 |
+27:17:27.4 |
HIP 51823 |
27.91 |
| 2026-05-29 00:00 |
10:33:39.22 |
+27:13:58.1 |
HIP 51823 |
21.23 |
| 2026-05-29 12:00 |
10:34:08.55 |
+27:10:27.8 |
HIP 51823 |
15.15 |
| 2026-05-30 00:00 |
10:34:38.04 |
+27:06:56.5 |
HIP 51823 |
10.85 |
| 2026-05-30 12:00 |
10:35:07.69 |
+27:03:24.2 |
HIP 51823 |
10.80 |
| 2026-05-31 00:00 |
10:35:37.49 |
+26:59:50.9 |
HIP 51823 |
15.12 |
| 2026-05-31 12:00 |
10:36:07.45 |
+26:56:16.7 |
HIP 51893 |
20.91 |
| 2026-06-01 00:00 |
10:36:37.56 |
+26:52:41.4 |
HIP 51893 |
25.38 |
| 2026-06-01 12:00 |
10:37:07.82 |
+26:49:05.2 |
HIP 52051 |
18.95 |
| 2026-06-02 00:00 |
10:37:38.22 |
+26:45:28.0 |
HIP 52051 |
11.63 |
| 2026-06-02 12:00 |
10:38:08.78 |
+26:41:49.9 |
HIP 52051 |
5.43 |
| 2026-06-03 00:00 |
10:38:39.48 |
+26:38:10.9 |
HIP 52051 |
6.61 |
| 2026-06-03 12:00 |
10:39:10.32 |
+26:34:30.9 |
HIP 52185 |
7.73 |
| 2026-06-04 00:00 |
10:39:41.31 |
+26:30:50.1 |
HIP 52185 |
7.34 |
| 2026-06-04 12:00 |
10:40:12.44 |
+26:27:08.3 |
HIP 52185 |
13.11 |
| 2026-06-05 00:00 |
10:40:43.71 |
+26:23:25.6 |
HIP 52185 |
20.38 |
| 2026-06-05 12:00 |
10:41:15.11 |
+26:19:42.0 |
HIP 52422 |
23.94 |
| 2026-06-06 00:00 |
10:41:46.65 |
+26:15:57.5 |
HIP 52422 |
17.25 |
| 2026-06-06 12:00 |
10:42:18.33 |
+26:12:12.2 |
HIP 52422 |
12.23 |
| 2026-06-07 00:00 |
10:42:50.14 |
+26:08:26.0 |
HIP 52422 |
11.42 |
| 2026-06-07 12:00 |
10:43:22.09 |
+26:04:38.9 |
HIP 52422 |
15.56 |
| 2026-06-08 00:00 |
10:43:54.17 |
+26:00:51.0 |
HIP 52456 |
16.26 |
| 2026-06-08 12:00 |
10:44:26.37 |
+25:57:02.2 |
HIP 52456 |
17.73 |
| 2026-06-09 00:00 |
10:44:58.71 |
+25:53:12.6 |
HIP 52667 |
17.57 |
| 2026-06-09 12:00 |
10:45:31.17 |
+25:49:22.2 |
HIP 52667 |
9.33 |
| 2026-06-10 00:00 |
10:46:03.76 |
+25:45:30.9 |
HIP 52667 |
1.23 |
| 2026-06-10 12:00 |
10:46:36.47 |
+25:41:38.8 |
HIP 52681 |
6.40 |
| 2026-06-11 00:00 |
10:47:09.31 |
+25:37:45.9 |
HIP 52681 |
11.60 |
| 2026-06-11 12:00 |
10:47:42.27 |
+25:33:52.3 |
HIP 52681 |
19.21 |
| 2026-06-12 00:00 |
10:48:15.35 |
+25:29:57.8 |
HIP 52681 |
27.32 |
| 2026-06-12 12:00 |
10:48:48.56 |
+25:26:02.5 |
HIP 52998 |
25.92 |
| 2026-06-13 00:00 |
10:49:21.88 |
+25:22:06.5 |
HIP 52998 |
22.33 |
| 2026-06-13 12:00 |
10:49:55.32 |
+25:18:09.7 |
HIP 52998 |
21.67 |
| 2026-06-14 00:00 |
10:50:28.87 |
+25:14:12.1 |
HIP 52998 |
24.20 |
| 2026-06-14 12:00 |
10:51:02.54 |
+25:10:13.8 |
HIP 52998 |
29.14 |
| 2026-06-15 00:00 |
10:51:36.32 |
+25:06:14.8 |
HIP 53184 |
31.40 |
| 2026-06-15 12:00 |
10:52:10.22 |
+25:02:15.0 |
HIP 53184 |
32.34 |
| 2026-06-16 00:00 |
10:52:44.23 |
+24:58:14.6 |
HIP 53184 |
35.44 |
| 2026-06-16 12:00 |
10:53:18.34 |
+24:54:13.4 |
HIP 53417 |
32.76 |
| 2026-06-17 00:00 |
10:53:52.57 |
+24:50:11.5 |
HIP 53417 |
24.23 |
| 2026-06-17 12:00 |
10:54:26.90 |
+24:46:08.9 |
HIP 53417 |
15.92 |
| 2026-06-18 00:00 |
10:55:01.34 |
+24:42:05.6 |
HIP 53417 |
8.57 |