メタデータ
| 項目 |
値 |
| Designation |
325P/Yang-Gao |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-05-22T10:39:09.037440Z |
| Orbit solution date (soln_date, UTC) |
2024-06-14T15:42:23Z |
| Obs used |
1380 |
| NEO |
Yes |
| M1 |
15.400 |
| K1 |
14.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
1951-05-28T04:33:01.440000Z |
| Discovery magnitude (MPC) |
14.00 T |
| Discovery observatory (MPC) |
711 · McDonald Observatory, Fort Davis |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-02-21.0000000 |
| e |
0.62430563 |
| q (au) |
1.279484 |
| a (au) |
3.405652 |
| i (deg) |
16.332066 |
| Ω (om, deg) |
258.854199 |
| ω (w, deg) |
346.999249 |
| M (ma, deg) |
157.535327 |
等級
散乱 + 全体線形
$$
M_a = (16.250 + 5.930\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.250 |
| n |
5.930 |
| gf |
1.000 |
| gb |
-0.578 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
06:16:30.41 |
+21:38:45.6 |
HIP 29827 |
31.88 |
| 2026-09-20 12:00 |
06:16:40.43 |
+21:38:02.4 |
HIP 29867 |
31.97 |
| 2026-09-21 00:00 |
06:16:50.28 |
+21:37:19.2 |
HIP 29867 |
32.09 |
| 2026-09-21 12:00 |
06:16:59.96 |
+21:36:35.8 |
HIP 29867 |
32.39 |
| 2026-09-22 00:00 |
06:17:09.46 |
+21:35:52.3 |
HIP 29981 |
32.73 |
| 2026-09-22 12:00 |
06:17:18.78 |
+21:35:08.7 |
HIP 29981 |
30.80 |
| 2026-09-23 00:00 |
06:17:27.93 |
+21:34:25.0 |
HIP 29981 |
28.94 |
| 2026-09-23 12:00 |
06:17:36.90 |
+21:33:41.1 |
HIP 29981 |
27.16 |
| 2026-09-24 00:00 |
06:17:45.69 |
+21:32:57.2 |
HIP 29981 |
25.48 |
| 2026-09-24 12:00 |
06:17:54.30 |
+21:32:13.2 |
HIP 29981 |
23.88 |
| 2026-09-25 00:00 |
06:18:02.73 |
+21:31:29.1 |
HIP 29981 |
22.40 |
| 2026-09-25 12:00 |
06:18:10.98 |
+21:30:44.8 |
HIP 29981 |
21.03 |
| 2026-09-26 00:00 |
06:18:19.05 |
+21:30:00.5 |
HIP 29981 |
19.78 |
| 2026-09-26 12:00 |
06:18:26.93 |
+21:29:16.1 |
HIP 29981 |
18.68 |
| 2026-09-27 00:00 |
06:18:34.62 |
+21:28:31.6 |
HIP 29981 |
17.73 |
| 2026-09-27 12:00 |
06:18:42.13 |
+21:27:46.9 |
HIP 29981 |
16.95 |
| 2026-09-28 00:00 |
06:18:49.45 |
+21:27:02.2 |
HIP 29981 |
16.35 |
| 2026-09-28 12:00 |
06:18:56.59 |
+21:26:17.5 |
HIP 29981 |
15.93 |
| 2026-09-29 00:00 |
06:19:03.53 |
+21:25:32.6 |
HIP 29981 |
15.69 |
| 2026-09-29 12:00 |
06:19:10.28 |
+21:24:47.6 |
HIP 29981 |
15.63 |
| 2026-09-30 00:00 |
06:19:16.85 |
+21:24:02.6 |
HIP 29981 |
15.74 |
| 2026-09-30 12:00 |
06:19:23.22 |
+21:23:17.4 |
HIP 29981 |
16.01 |
| 2026-10-01 00:00 |
06:19:29.39 |
+21:22:32.2 |
HIP 29981 |
16.40 |
| 2026-10-01 12:00 |
06:19:35.37 |
+21:21:47.0 |
HIP 29981 |
16.91 |
| 2026-10-02 00:00 |
06:19:41.16 |
+21:21:01.6 |
HIP 29981 |
17.51 |
| 2026-10-02 12:00 |
06:19:46.74 |
+21:20:16.2 |
HIP 29981 |
18.18 |
| 2026-10-03 00:00 |
06:19:52.13 |
+21:19:30.7 |
HIP 29981 |
18.91 |
| 2026-10-03 12:00 |
06:19:57.32 |
+21:18:45.1 |
HIP 29981 |
19.67 |
| 2026-10-04 00:00 |
06:20:02.31 |
+21:17:59.5 |
HIP 30211 |
19.55 |
| 2026-10-04 12:00 |
06:20:07.10 |
+21:17:13.8 |
HIP 30202 |
18.24 |
| 2026-10-05 00:00 |
06:20:11.68 |
+21:16:28.0 |
HIP 30202 |
16.94 |
| 2026-10-05 12:00 |
06:20:16.06 |
+21:15:42.2 |
HIP 30202 |
15.67 |
| 2026-10-06 00:00 |
06:20:20.23 |
+21:14:56.3 |
HIP 30202 |
14.45 |
| 2026-10-06 12:00 |
06:20:24.20 |
+21:14:10.3 |
HIP 30202 |
13.27 |
| 2026-10-07 00:00 |
06:20:27.96 |
+21:13:24.3 |
HIP 30202 |
12.14 |
| 2026-10-07 12:00 |
06:20:31.51 |
+21:12:38.3 |
HIP 30202 |
11.06 |
| 2026-10-08 00:00 |
06:20:34.85 |
+21:11:52.2 |
HIP 30202 |
10.04 |
| 2026-10-08 12:00 |
06:20:37.98 |
+21:11:06.0 |
HIP 30202 |
9.07 |
| 2026-10-09 00:00 |
06:20:40.90 |
+21:10:19.8 |
HIP 30202 |
8.18 |
| 2026-10-09 12:00 |
06:20:43.61 |
+21:09:33.6 |
HIP 30202 |
7.38 |
| 2026-10-10 00:00 |
06:20:46.11 |
+21:08:47.3 |
HIP 30202 |
6.67 |
| 2026-10-10 12:00 |
06:20:48.39 |
+21:08:00.9 |
HIP 30202 |
6.08 |
| 2026-10-11 00:00 |
06:20:50.46 |
+21:07:14.6 |
HIP 30202 |
5.65 |