メタデータ
| 項目 |
値 |
| Designation |
172P/Yeung |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-03-09T19:52:33.948480Z |
| Orbit solution date (soln_date, UTC) |
2025-06-26T10:13:18Z |
| Obs used |
794 |
| NEO |
- |
| M1 |
14.800 |
| 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) |
2013-06-05.0000000 |
| e |
0.22433762 |
| q (au) |
3.237563 |
| a (au) |
4.173933 |
| i (deg) |
11.337557 |
| Ω (om, deg) |
33.678106 |
| ω (w, deg) |
208.775652 |
| M (ma, deg) |
201.211793 |
等級
散乱 + 全体線形
$$
M_a = (14.025 + 2.597\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.025 |
| n |
2.597 |
| gf |
0.995 |
| gb |
-0.747 |
| k |
0.986 |
| 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) |
| 2026-06-01 00:00 |
19:14:19.27 |
-36:01:21.9 |
HIP 94549 |
9.93 |
| 2026-06-01 12:00 |
19:14:06.93 |
-36:03:28.5 |
HIP 94549 |
12.90 |
| 2026-06-02 00:00 |
19:13:54.28 |
-36:05:34.7 |
HIP 94549 |
16.01 |
| 2026-06-02 12:00 |
19:13:41.32 |
-36:07:40.4 |
HIP 94549 |
19.22 |
| 2026-06-03 00:00 |
19:13:28.05 |
-36:09:45.7 |
HIP 94356 |
19.21 |
| 2026-06-03 12:00 |
19:13:14.47 |
-36:11:50.5 |
HIP 94356 |
18.97 |
| 2026-06-04 00:00 |
19:13:00.59 |
-36:13:54.8 |
HIP 94356 |
19.31 |
| 2026-06-04 12:00 |
19:12:46.41 |
-36:15:58.6 |
HIP 94374 |
19.43 |
| 2026-06-05 00:00 |
19:12:31.94 |
-36:18:01.8 |
HIP 94374 |
17.06 |
| 2026-06-05 12:00 |
19:12:17.16 |
-36:20:04.4 |
HIP 94374 |
15.18 |
| 2026-06-06 00:00 |
19:12:02.10 |
-36:22:06.4 |
HIP 94374 |
14.03 |
| 2026-06-06 12:00 |
19:11:46.74 |
-36:24:07.8 |
HIP 94374 |
13.82 |
| 2026-06-07 00:00 |
19:11:31.09 |
-36:26:08.5 |
HIP 94374 |
14.63 |
| 2026-06-07 12:00 |
19:11:15.17 |
-36:28:08.6 |
HIP 94374 |
16.32 |
| 2026-06-08 00:00 |
19:10:58.96 |
-36:30:07.8 |
HIP 94374 |
18.70 |
| 2026-06-08 12:00 |
19:10:42.47 |
-36:32:06.4 |
HIP 94374 |
21.54 |
| 2026-06-09 00:00 |
19:10:25.70 |
-36:34:04.2 |
HIP 94374 |
24.72 |
| 2026-06-09 12:00 |
19:10:08.67 |
-36:36:01.1 |
HIP 94124 |
26.93 |
| 2026-06-10 00:00 |
19:09:51.37 |
-36:37:57.3 |
HIP 93962 |
27.61 |
| 2026-06-10 12:00 |
19:09:33.80 |
-36:39:52.5 |
HIP 93962 |
23.61 |
| 2026-06-11 00:00 |
19:09:15.98 |
-36:41:46.9 |
HIP 93962 |
19.57 |
| 2026-06-11 12:00 |
19:08:57.89 |
-36:43:40.4 |
HIP 93962 |
15.51 |
| 2026-06-12 00:00 |
19:08:39.56 |
-36:45:32.9 |
HIP 93962 |
11.45 |
| 2026-06-12 12:00 |
19:08:20.98 |
-36:47:24.5 |
HIP 93962 |
7.42 |
| 2026-06-13 00:00 |
19:08:02.15 |
-36:49:15.0 |
HIP 93962 |
3.70 |
| 2026-06-13 12:00 |
19:07:43.08 |
-36:51:04.6 |
HIP 93962 |
2.78 |
| 2026-06-14 00:00 |
19:07:23.78 |
-36:52:53.0 |
HIP 93962 |
6.17 |
| 2026-06-14 12:00 |
19:07:04.25 |
-36:54:40.4 |
HIP 93962 |
10.27 |
| 2026-06-15 00:00 |
19:06:44.50 |
-36:56:26.7 |
HIP 93825 |
8.29 |
| 2026-06-15 12:00 |
19:06:24.52 |
-36:58:11.9 |
HIP 93825 |
5.57 |
| 2026-06-16 00:00 |
19:06:04.33 |
-36:59:55.8 |
HIP 93825 |
5.64 |
| 2026-06-16 12:00 |
19:05:43.93 |
-37:01:38.6 |
HIP 93825 |
8.47 |
| 2026-06-17 00:00 |
19:05:23.33 |
-37:03:20.2 |
HIP 93825 |
12.32 |
| 2026-06-17 12:00 |
19:05:02.52 |
-37:05:00.5 |
HIP 93689 |
14.78 |
| 2026-06-18 00:00 |
19:04:41.53 |
-37:06:39.6 |
HIP 93689 |
15.99 |
| 2026-06-18 12:00 |
19:04:20.34 |
-37:08:17.3 |
HIP 93689 |
18.25 |
| 2026-06-19 00:00 |
19:03:58.98 |
-37:09:53.8 |
HIP 93689 |
21.25 |
| 2026-06-19 12:00 |
19:03:37.43 |
-37:11:28.9 |
HIP 93689 |
24.73 |
| 2026-06-20 00:00 |
19:03:15.72 |
-37:13:02.6 |
HIP 93449 |
22.82 |
| 2026-06-20 12:00 |
19:02:53.84 |
-37:14:35.0 |
HIP 93449 |
21.17 |
| 2026-06-21 00:00 |
19:02:31.80 |
-37:16:05.9 |
HIP 93449 |
20.43 |
| 2026-06-21 12:00 |
19:02:09.60 |
-37:17:35.4 |
HIP 93371 |
19.04 |
| 2026-06-22 00:00 |
19:01:47.26 |
-37:19:03.5 |
HIP 93371 |
17.59 |