メタデータ
| 項目 |
値 |
| Designation |
394P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-11-30T03:51:06.033600Z |
| Orbit solution date (soln_date, UTC) |
2024-10-10T17:31:58Z |
| Obs used |
92 |
| NEO |
- |
| M1 |
16.900 |
| 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) |
2017-09-13.0000000 |
| e |
0.36911578 |
| q (au) |
2.737095 |
| a (au) |
4.338507 |
| i (deg) |
8.527558 |
| Ω (om, deg) |
98.139243 |
| ω (w, deg) |
54.497804 |
| M (ma, deg) |
271.856301 |
等級
散乱 + 全体線形
$$
M_a = (17.004 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.004 |
| n |
2.000 |
| gf |
0.937 |
| gb |
-0.901 |
| k |
0.998 |
| δ90 |
1.000 |
| 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
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) |
| 2026-05-12 00:00 |
01:27:59.66 |
+01:24:14.8 |
HIP 6750 |
17.81 |
| 2026-05-12 12:00 |
01:28:22.98 |
+01:26:19.7 |
HIP 6750 |
24.00 |
| 2026-05-13 00:00 |
01:28:46.28 |
+01:28:24.1 |
HIP 7025 |
27.16 |
| 2026-05-13 12:00 |
01:29:09.54 |
+01:30:28.0 |
HIP 7025 |
22.33 |
| 2026-05-14 00:00 |
01:29:32.77 |
+01:32:31.3 |
HIP 7025 |
18.32 |
| 2026-05-14 12:00 |
01:29:55.96 |
+01:34:34.1 |
HIP 7025 |
15.76 |
| 2026-05-15 00:00 |
01:30:19.13 |
+01:36:36.4 |
HIP 7025 |
15.38 |
| 2026-05-15 12:00 |
01:30:42.25 |
+01:38:38.1 |
HIP 7025 |
17.31 |
| 2026-05-16 00:00 |
01:31:05.34 |
+01:40:39.2 |
HIP 7160 |
19.36 |
| 2026-05-16 12:00 |
01:31:28.40 |
+01:42:39.8 |
HIP 7160 |
15.05 |
| 2026-05-17 00:00 |
01:31:51.42 |
+01:44:39.8 |
HIP 7160 |
12.36 |
| 2026-05-17 12:00 |
01:32:14.40 |
+01:46:39.3 |
HIP 7160 |
12.37 |
| 2026-05-18 00:00 |
01:32:37.34 |
+01:48:38.2 |
HIP 7160 |
15.06 |
| 2026-05-18 12:00 |
01:33:00.24 |
+01:50:36.5 |
HIP 7160 |
19.33 |
| 2026-05-19 00:00 |
01:33:23.10 |
+01:52:34.2 |
HIP 7160 |
24.36 |
| 2026-05-19 12:00 |
01:33:45.92 |
+01:54:31.4 |
HIP 7270 |
27.11 |
| 2026-05-20 00:00 |
01:34:08.70 |
+01:56:27.9 |
HIP 7270 |
26.26 |
| 2026-05-20 12:00 |
01:34:31.44 |
+01:58:23.9 |
HIP 7270 |
26.78 |
| 2026-05-21 00:00 |
01:34:54.13 |
+02:00:19.3 |
HIP 7270 |
28.57 |
| 2026-05-21 12:00 |
01:35:16.78 |
+02:02:14.1 |
HIP 7312 |
30.03 |
| 2026-05-22 00:00 |
01:35:39.39 |
+02:04:08.3 |
HIP 7312 |
32.24 |
| 2026-05-22 12:00 |
01:36:01.95 |
+02:06:01.9 |
HIP 7312 |
35.32 |
| 2026-05-23 00:00 |
01:36:24.47 |
+02:07:54.8 |
HIP 7312 |
39.06 |
| 2026-05-23 12:00 |
01:36:46.94 |
+02:09:47.2 |
HIP 7632 |
34.40 |
| 2026-05-24 00:00 |
01:37:09.36 |
+02:11:39.0 |
HIP 7632 |
29.38 |
| 2026-05-24 12:00 |
01:37:31.74 |
+02:13:30.1 |
HIP 7632 |
24.78 |
| 2026-05-25 00:00 |
01:37:54.07 |
+02:15:20.7 |
HIP 7632 |
20.84 |
| 2026-05-25 12:00 |
01:38:16.35 |
+02:17:10.6 |
HIP 7722 |
17.57 |
| 2026-05-26 00:00 |
01:38:38.59 |
+02:18:59.9 |
HIP 7722 |
13.39 |
| 2026-05-26 12:00 |
01:39:00.77 |
+02:20:48.5 |
HIP 7722 |
10.86 |
| 2026-05-27 00:00 |
01:39:22.90 |
+02:22:36.6 |
HIP 7722 |
11.17 |
| 2026-05-27 12:00 |
01:39:44.98 |
+02:24:24.0 |
HIP 7722 |
14.09 |
| 2026-05-28 00:00 |
01:40:07.02 |
+02:26:10.7 |
HIP 7722 |
18.41 |
| 2026-05-28 12:00 |
01:40:29.00 |
+02:27:56.9 |
HIP 7833 |
15.04 |
| 2026-05-29 00:00 |
01:40:50.92 |
+02:29:42.4 |
HIP 7833 |
12.63 |
| 2026-05-29 12:00 |
01:41:12.80 |
+02:31:27.2 |
HIP 7833 |
12.62 |
| 2026-05-30 00:00 |
01:41:34.62 |
+02:33:11.4 |
HIP 7833 |
14.98 |
| 2026-05-30 12:00 |
01:41:56.38 |
+02:34:55.0 |
HIP 7957 |
16.80 |
| 2026-05-31 00:00 |
01:42:18.10 |
+02:36:37.9 |
HIP 7957 |
18.25 |
| 2026-05-31 12:00 |
01:42:39.75 |
+02:38:20.1 |
HIP 7957 |
21.17 |
| 2026-06-01 00:00 |
01:43:01.35 |
+02:40:01.7 |
HIP 8116 |
19.73 |
| 2026-06-01 12:00 |
01:43:22.89 |
+02:41:42.6 |
HIP 8116 |
14.89 |
| 2026-06-02 00:00 |
01:43:44.38 |
+02:43:22.9 |
HIP 8116 |
10.86 |