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) |
| 2026-03-26 00:00 |
00:50:28.43 |
-02:21:35.1 |
HIP 3957 |
26.70 |
| 2026-03-26 12:00 |
00:50:52.18 |
-02:18:57.8 |
HIP 3957 |
23.68 |
| 2026-03-27 00:00 |
00:51:15.95 |
-02:16:20.7 |
HIP 3957 |
22.20 |
| 2026-03-27 12:00 |
00:51:39.74 |
-02:13:43.7 |
HIP 3957 |
22.57 |
| 2026-03-28 00:00 |
00:52:03.54 |
-02:11:06.9 |
HIP 4125 |
20.78 |
| 2026-03-28 12:00 |
00:52:27.37 |
-02:08:30.3 |
HIP 4125 |
15.62 |
| 2026-03-29 00:00 |
00:52:51.22 |
-02:05:53.9 |
HIP 4125 |
11.85 |
| 2026-03-29 12:00 |
00:53:15.08 |
-02:03:17.6 |
HIP 4125 |
11.03 |
| 2026-03-30 00:00 |
00:53:38.96 |
-02:00:41.6 |
HIP 4125 |
13.70 |
| 2026-03-30 12:00 |
00:54:02.86 |
-01:58:05.7 |
HIP 4125 |
18.40 |
| 2026-03-31 00:00 |
00:54:26.78 |
-01:55:30.0 |
HIP 4125 |
23.97 |
| 2026-03-31 12:00 |
00:54:50.71 |
-01:52:54.5 |
HIP 4314 |
23.42 |
| 2026-04-01 00:00 |
00:55:14.65 |
-01:50:19.2 |
HIP 4314 |
20.13 |
| 2026-04-01 12:00 |
00:55:38.62 |
-01:47:44.2 |
HIP 4314 |
18.62 |
| 2026-04-02 00:00 |
00:56:02.59 |
-01:45:09.3 |
HIP 4314 |
19.32 |
| 2026-04-02 12:00 |
00:56:26.58 |
-01:42:34.6 |
HIP 4478 |
14.87 |
| 2026-04-03 00:00 |
00:56:50.59 |
-01:40:00.2 |
HIP 4478 |
11.62 |
| 2026-04-03 12:00 |
00:57:14.60 |
-01:37:25.9 |
HIP 4478 |
11.59 |
| 2026-04-04 00:00 |
00:57:38.63 |
-01:34:51.9 |
HIP 4511 |
11.46 |
| 2026-04-04 12:00 |
00:58:02.68 |
-01:32:18.1 |
HIP 4511 |
14.01 |
| 2026-04-05 00:00 |
00:58:26.73 |
-01:29:44.6 |
HIP 4511 |
18.61 |
| 2026-04-05 12:00 |
00:58:50.80 |
-01:27:11.3 |
HIP 4641 |
19.19 |
| 2026-04-06 00:00 |
00:59:14.87 |
-01:24:38.2 |
HIP 4641 |
14.07 |
| 2026-04-06 12:00 |
00:59:38.96 |
-01:22:05.3 |
HIP 4641 |
10.63 |
| 2026-04-07 00:00 |
01:00:03.05 |
-01:19:32.7 |
HIP 4641 |
10.65 |
| 2026-04-07 12:00 |
01:00:27.16 |
-01:17:00.4 |
HIP 4641 |
14.13 |
| 2026-04-08 00:00 |
01:00:51.27 |
-01:14:28.3 |
HIP 4735 |
13.16 |
| 2026-04-08 12:00 |
01:01:15.40 |
-01:11:56.4 |
HIP 4735 |
12.42 |
| 2026-04-09 00:00 |
01:01:39.53 |
-01:09:24.8 |
HIP 4735 |
14.87 |
| 2026-04-09 12:00 |
01:02:03.66 |
-01:06:53.5 |
HIP 4735 |
19.32 |
| 2026-04-10 00:00 |
01:02:27.81 |
-01:04:22.4 |
HIP 4984 |
21.44 |
| 2026-04-10 12:00 |
01:02:51.96 |
-01:01:51.7 |
HIP 4984 |
15.40 |
| 2026-04-11 00:00 |
01:03:16.11 |
-00:59:21.2 |
HIP 4984 |
10.01 |
| 2026-04-11 12:00 |
01:03:40.27 |
-00:56:50.9 |
HIP 4984 |
6.97 |
| 2026-04-12 00:00 |
01:04:04.43 |
-00:54:21.0 |
HIP 4984 |
9.08 |
| 2026-04-12 12:00 |
01:04:28.60 |
-00:51:51.3 |
HIP 4984 |
14.21 |
| 2026-04-13 00:00 |
01:04:52.77 |
-00:49:22.0 |
HIP 4984 |
20.16 |
| 2026-04-13 12:00 |
01:05:16.95 |
-00:46:52.9 |
HIP 5189 |
17.29 |
| 2026-04-14 00:00 |
01:05:41.12 |
-00:44:24.2 |
HIP 5189 |
11.15 |
| 2026-04-14 12:00 |
01:06:05.30 |
-00:41:55.7 |
HIP 5189 |
5.93 |
| 2026-04-15 00:00 |
01:06:29.48 |
-00:39:27.6 |
HIP 5189 |
5.58 |
| 2026-04-15 12:00 |
01:06:53.66 |
-00:36:59.8 |
HIP 5245 |
3.09 |
| 2026-04-16 00:00 |
01:07:17.84 |
-00:34:32.3 |
HIP 5245 |
3.47 |