172P/Yeung
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 |
0.999 |
| 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) |
| 2026-02-03 00:00 |
17:49:14.26 |
-30:08:04.4 |
HIP 87162 |
14.33 |
| 2026-02-03 12:00 |
17:49:58.10 |
-30:09:23.3 |
HIP 87162 |
21.61 |
| 2026-02-04 00:00 |
17:50:41.86 |
-30:10:41.7 |
HIP 87391 |
12.97 |
| 2026-02-04 12:00 |
17:51:25.52 |
-30:11:59.6 |
HIP 87391 |
5.53 |
| 2026-02-05 00:00 |
17:52:09.10 |
-30:13:17.1 |
HIP 87456 |
4.22 |
| 2026-02-05 12:00 |
17:52:52.59 |
-30:14:34.2 |
HIP 87498 |
2.84 |
| 2026-02-06 00:00 |
17:53:35.99 |
-30:15:50.8 |
HIP 87498 |
12.14 |
| 2026-02-06 12:00 |
17:54:19.30 |
-30:17:07.0 |
HIP 87498 |
21.56 |
| 2026-02-07 00:00 |
17:55:02.51 |
-30:18:22.8 |
HIP 87733 |
17.91 |
| 2026-02-07 12:00 |
17:55:45.64 |
-30:19:38.2 |
HIP 87733 |
17.63 |
| 2026-02-08 00:00 |
17:56:28.66 |
-30:20:53.2 |
HIP 87956 |
21.04 |
| 2026-02-08 12:00 |
17:57:11.59 |
-30:22:07.8 |
HIP 87956 |
11.70 |
| 2026-02-09 00:00 |
17:57:54.42 |
-30:23:22.0 |
HIP 87956 |
2.43 |
| 2026-02-09 12:00 |
17:58:37.15 |
-30:24:35.8 |
HIP 88042 |
5.95 |
| 2026-02-10 00:00 |
17:59:19.79 |
-30:25:49.2 |
HIP 88042 |
6.93 |
| 2026-02-10 12:00 |
18:00:02.32 |
-30:27:02.3 |
HIP 88042 |
15.23 |
| 2026-02-11 00:00 |
18:00:44.74 |
-30:28:15.0 |
HIP 88198 |
15.38 |
| 2026-02-11 12:00 |
18:01:27.07 |
-30:29:27.4 |
HIP 88198 |
19.30 |
| 2026-02-12 00:00 |
18:02:09.29 |
-30:30:39.4 |
HIP 88276 |
19.50 |
| 2026-02-12 12:00 |
18:02:51.40 |
-30:31:51.0 |
HIP 88276 |
23.52 |
| 2026-02-13 00:00 |
18:03:33.40 |
-30:33:02.3 |
HIP 88634 |
29.52 |
| 2026-02-13 12:00 |
18:04:15.30 |
-30:34:13.3 |
HIP 88634 |
20.44 |
| 2026-02-14 00:00 |
18:04:57.08 |
-30:35:24.0 |
HIP 88634 |
11.42 |
| 2026-02-14 12:00 |
18:05:38.75 |
-30:36:34.4 |
HIP 88634 |
2.73 |
| 2026-02-15 00:00 |
18:06:20.31 |
-30:37:44.4 |
HIP 88645 |
5.81 |
| 2026-02-15 12:00 |
18:07:01.76 |
-30:38:54.2 |
HIP 88645 |
14.43 |
| 2026-02-16 00:00 |
18:07:43.08 |
-30:40:03.6 |
HIP 88837 |
20.46 |
| 2026-02-16 12:00 |
18:08:24.29 |
-30:41:12.8 |
HIP 88837 |
19.42 |
| 2026-02-17 00:00 |
18:09:05.39 |
-30:42:21.7 |
HIP 89020 |
13.06 |
| 2026-02-17 12:00 |
18:09:46.36 |
-30:43:30.3 |
HIP 89020 |
4.18 |
| 2026-02-18 00:00 |
18:10:27.21 |
-30:44:38.7 |
HIP 89020 |
4.69 |
| 2026-02-18 12:00 |
18:11:07.94 |
-30:45:46.8 |
HIP 89020 |
13.51 |
| 2026-02-19 00:00 |
18:11:48.54 |
-30:46:54.7 |
HIP 89020 |
22.30 |
| 2026-02-19 12:00 |
18:12:29.02 |
-30:48:02.3 |
HIP 89124 |
30.18 |
| 2026-02-20 00:00 |
18:13:09.38 |
-30:49:09.7 |
HIP 89124 |
36.00 |
| 2026-02-20 12:00 |
18:13:49.60 |
-30:50:16.9 |
HIP 89526 |
29.20 |
| 2026-02-21 00:00 |
18:14:29.70 |
-30:51:23.8 |
HIP 89526 |
20.58 |
| 2026-02-21 12:00 |
18:15:09.66 |
-30:52:30.6 |
HIP 89526 |
12.07 |
| 2026-02-22 00:00 |
18:15:49.50 |
-30:53:37.1 |
HIP 89526 |
4.22 |
| 2026-02-22 12:00 |
18:16:29.20 |
-30:54:43.5 |
HIP 89535 |
4.46 |
| 2026-02-23 00:00 |
18:17:08.77 |
-30:55:49.6 |
HIP 89535 |
12.67 |
| 2026-02-23 12:00 |
18:17:48.20 |
-30:56:55.6 |
HIP 89535 |
21.12 |
| 2026-02-24 00:00 |
18:18:27.50 |
-30:58:01.5 |
HIP 89535 |
29.59 |