メタデータ
| 項目 |
値 |
| Designation |
172P/Yeung |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-03-11T00:04:39.244800Z |
| Orbit solution date (soln_date, UTC) |
2026-08-07T12:42:20Z |
| Obs used |
804 |
| 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) |
2013-07-29.0000000 |
| e |
0.22285811 |
| q (au) |
3.248075 |
| a (au) |
4.179514 |
| i (deg) |
11.298684 |
| Ω (om, deg) |
33.481576 |
| ω (w, deg) |
208.807215 |
| M (ma, deg) |
207.623024 |
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) |
| 2026-09-20 00:00 |
18:34:40.07 |
-35:26:17.5 |
HIP 91025 |
19.00 |
| 2026-09-20 12:00 |
18:34:56.97 |
-35:24:37.6 |
HIP 91025 |
21.92 |
| 2026-09-21 00:00 |
18:35:14.15 |
-35:22:57.5 |
HIP 91104 |
20.72 |
| 2026-09-21 12:00 |
18:35:31.59 |
-35:21:17.3 |
HIP 91104 |
19.87 |
| 2026-09-22 00:00 |
18:35:49.30 |
-35:19:36.9 |
HIP 91104 |
19.80 |
| 2026-09-22 12:00 |
18:36:07.27 |
-35:17:56.5 |
HIP 91104 |
20.56 |
| 2026-09-23 00:00 |
18:36:25.50 |
-35:16:15.9 |
HIP 91104 |
22.09 |
| 2026-09-23 12:00 |
18:36:43.99 |
-35:14:35.2 |
HIP 91104 |
24.26 |
| 2026-09-24 00:00 |
18:37:02.74 |
-35:12:54.5 |
HIP 91305 |
22.79 |
| 2026-09-24 12:00 |
18:37:21.74 |
-35:11:13.5 |
HIP 91305 |
20.55 |
| 2026-09-25 00:00 |
18:37:41.00 |
-35:09:32.5 |
HIP 91305 |
19.00 |
| 2026-09-25 12:00 |
18:38:00.51 |
-35:07:51.4 |
HIP 91305 |
18.37 |
| 2026-09-26 00:00 |
18:38:20.26 |
-35:06:10.1 |
HIP 91305 |
18.77 |
| 2026-09-26 12:00 |
18:38:40.27 |
-35:04:28.7 |
HIP 91504 |
17.84 |
| 2026-09-27 00:00 |
18:39:00.52 |
-35:02:47.2 |
HIP 91504 |
16.78 |
| 2026-09-27 12:00 |
18:39:21.02 |
-35:01:05.6 |
HIP 91558 |
14.44 |
| 2026-09-28 00:00 |
18:39:41.76 |
-34:59:23.9 |
HIP 91558 |
12.59 |
| 2026-09-28 12:00 |
18:40:02.74 |
-34:57:42.0 |
HIP 91603 |
10.34 |
| 2026-09-29 00:00 |
18:40:23.96 |
-34:56:00.1 |
HIP 91603 |
6.03 |
| 2026-09-29 12:00 |
18:40:45.42 |
-34:54:18.0 |
HIP 91603 |
3.05 |
| 2026-09-30 00:00 |
18:41:07.11 |
-34:52:35.7 |
HIP 91603 |
5.20 |
| 2026-09-30 12:00 |
18:41:29.04 |
-34:50:53.4 |
HIP 91603 |
9.53 |
| 2026-10-01 00:00 |
18:41:51.20 |
-34:49:10.9 |
HIP 91603 |
14.21 |
| 2026-10-01 12:00 |
18:42:13.59 |
-34:47:28.3 |
HIP 91603 |
19.03 |
| 2026-10-02 00:00 |
18:42:36.22 |
-34:45:45.5 |
HIP 91700 |
19.10 |
| 2026-10-02 12:00 |
18:42:59.07 |
-34:44:02.7 |
HIP 91700 |
19.86 |
| 2026-10-03 00:00 |
18:43:22.15 |
-34:42:19.7 |
HIP 91700 |
21.81 |
| 2026-10-03 12:00 |
18:43:45.45 |
-34:40:36.5 |
HIP 91700 |
24.70 |
| 2026-10-04 00:00 |
18:44:08.97 |
-34:38:53.2 |
HIP 92070 |
22.41 |
| 2026-10-04 12:00 |
18:44:32.72 |
-34:37:09.8 |
HIP 92070 |
17.30 |
| 2026-10-05 00:00 |
18:44:56.69 |
-34:35:26.2 |
HIP 92070 |
12.20 |
| 2026-10-05 12:00 |
18:45:20.88 |
-34:33:42.5 |
HIP 92070 |
7.22 |
| 2026-10-06 00:00 |
18:45:45.29 |
-34:31:58.6 |
HIP 92070 |
3.30 |
| 2026-10-06 12:00 |
18:46:09.91 |
-34:30:14.6 |
HIP 92070 |
5.14 |
| 2026-10-07 00:00 |
18:46:34.75 |
-34:28:30.4 |
HIP 92070 |
10.00 |
| 2026-10-07 12:00 |
18:46:59.80 |
-34:26:46.1 |
HIP 92070 |
15.28 |
| 2026-10-08 00:00 |
18:47:25.07 |
-34:25:01.6 |
HIP 92059 |
20.61 |
| 2026-10-08 12:00 |
18:47:50.54 |
-34:23:16.9 |
HIP 92327 |
17.66 |
| 2026-10-09 00:00 |
18:48:16.22 |
-34:21:32.1 |
HIP 92327 |
14.84 |
| 2026-10-09 12:00 |
18:48:42.11 |
-34:19:47.2 |
HIP 92327 |
13.79 |
| 2026-10-10 00:00 |
18:49:08.20 |
-34:18:02.0 |
HIP 92327 |
14.95 |
| 2026-10-10 12:00 |
18:49:34.50 |
-34:16:16.7 |
HIP 92465 |
14.43 |
| 2026-10-11 00:00 |
18:50:01.00 |
-34:14:31.2 |
HIP 92476 |
10.19 |