メタデータ
| 項目 |
値 |
| Designation |
P/2017 U3 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-04-21T20:05:53.658240Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:13:39Z |
| Obs used |
73 |
| NEO |
- |
| M1 |
14.700 |
| 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) |
2017-08-27.0000000 |
| e |
0.09998087 |
| q (au) |
4.443406 |
| a (au) |
4.937013 |
| i (deg) |
15.908436 |
| Ω (om, deg) |
165.150002 |
| ω (w, deg) |
297.458320 |
| M (ma, deg) |
305.836360 |
等級
散乱 + 全体線形
$$
M_a = (15.774 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.774 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.580 |
| k |
0.800 |
| 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
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) |
| 2026-09-20 00:00 |
22:13:16.87 |
-08:00:52.3 |
HIP 109637 |
10.18 |
| 2026-09-20 12:00 |
22:13:05.28 |
-08:02:58.3 |
HIP 109637 |
7.62 |
| 2026-09-21 00:00 |
22:12:53.80 |
-08:05:03.6 |
HIP 109637 |
6.15 |
| 2026-09-21 12:00 |
22:12:42.45 |
-08:07:08.4 |
HIP 109637 |
6.52 |
| 2026-09-22 00:00 |
22:12:31.20 |
-08:09:12.5 |
HIP 109637 |
8.45 |
| 2026-09-22 12:00 |
22:12:20.08 |
-08:11:15.9 |
HIP 109637 |
11.13 |
| 2026-09-23 00:00 |
22:12:09.08 |
-08:13:18.8 |
HIP 109637 |
14.12 |
| 2026-09-23 12:00 |
22:11:58.20 |
-08:15:20.9 |
HIP 109637 |
17.24 |
| 2026-09-24 00:00 |
22:11:47.45 |
-08:17:22.4 |
HIP 109637 |
20.41 |
| 2026-09-24 12:00 |
22:11:36.82 |
-08:19:23.2 |
HIP 109637 |
23.60 |
| 2026-09-25 00:00 |
22:11:26.32 |
-08:21:23.3 |
HIP 109637 |
26.79 |
| 2026-09-25 12:00 |
22:11:15.95 |
-08:23:22.7 |
HIP 109369 |
29.63 |
| 2026-09-26 00:00 |
22:11:05.71 |
-08:25:21.4 |
HIP 109369 |
28.28 |
| 2026-09-26 12:00 |
22:10:55.60 |
-08:27:19.3 |
HIP 109369 |
27.27 |
| 2026-09-27 00:00 |
22:10:45.63 |
-08:29:16.5 |
HIP 109380 |
26.40 |
| 2026-09-27 12:00 |
22:10:35.80 |
-08:31:12.9 |
HIP 109380 |
23.31 |
| 2026-09-28 00:00 |
22:10:26.10 |
-08:33:08.6 |
HIP 109380 |
20.26 |
| 2026-09-28 12:00 |
22:10:16.54 |
-08:35:03.4 |
HIP 109380 |
17.26 |
| 2026-09-29 00:00 |
22:10:07.13 |
-08:36:57.5 |
HIP 109380 |
14.30 |
| 2026-09-29 12:00 |
22:09:57.85 |
-08:38:50.8 |
HIP 109380 |
11.41 |
| 2026-09-30 00:00 |
22:09:48.73 |
-08:40:43.3 |
HIP 109380 |
8.59 |
| 2026-09-30 12:00 |
22:09:39.74 |
-08:42:34.9 |
HIP 109380 |
5.91 |
| 2026-10-01 00:00 |
22:09:30.90 |
-08:44:25.7 |
HIP 109380 |
3.61 |
| 2026-10-01 12:00 |
22:09:22.22 |
-08:46:15.7 |
HIP 109380 |
2.71 |
| 2026-10-02 00:00 |
22:09:13.68 |
-08:48:04.7 |
HIP 109380 |
4.15 |
| 2026-10-02 12:00 |
22:09:05.29 |
-08:49:53.0 |
HIP 109380 |
6.49 |
| 2026-10-03 00:00 |
22:08:57.06 |
-08:51:40.3 |
HIP 109380 |
9.02 |
| 2026-10-03 12:00 |
22:08:48.98 |
-08:53:26.8 |
HIP 109380 |
11.60 |
| 2026-10-04 00:00 |
22:08:41.06 |
-08:55:12.3 |
HIP 109380 |
14.16 |
| 2026-10-04 12:00 |
22:08:33.29 |
-08:56:57.0 |
HIP 109380 |
16.71 |
| 2026-10-05 00:00 |
22:08:25.69 |
-08:58:40.7 |
HIP 109380 |
19.22 |
| 2026-10-05 12:00 |
22:08:18.24 |
-09:00:23.5 |
HIP 109380 |
21.71 |
| 2026-10-06 00:00 |
22:08:10.96 |
-09:02:05.4 |
HIP 109380 |
24.15 |
| 2026-10-06 12:00 |
22:08:03.84 |
-09:03:46.3 |
HIP 109380 |
26.56 |
| 2026-10-07 00:00 |
22:07:56.88 |
-09:05:26.2 |
HIP 109380 |
28.94 |
| 2026-10-07 12:00 |
22:07:50.09 |
-09:07:05.2 |
HIP 109142 |
30.54 |
| 2026-10-08 00:00 |
22:07:43.47 |
-09:08:43.2 |
HIP 109142 |
30.80 |
| 2026-10-08 12:00 |
22:07:37.01 |
-09:10:20.2 |
HIP 109142 |
31.25 |
| 2026-10-09 00:00 |
22:07:30.72 |
-09:11:56.2 |
HIP 109142 |
31.86 |
| 2026-10-09 12:00 |
22:07:24.61 |
-09:13:31.2 |
HIP 109142 |
32.61 |
| 2026-10-10 00:00 |
22:07:18.66 |
-09:15:05.2 |
HIP 109142 |
33.49 |
| 2026-10-10 12:00 |
22:07:12.89 |
-09:16:38.2 |
HIP 109142 |
34.47 |
| 2026-10-11 00:00 |
22:07:07.29 |
-09:18:10.1 |
HIP 109142 |
35.55 |