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) |
| 2026-03-26 00:00 |
04:09:36.38 |
+21:57:01.3 |
HIP 19299 |
19.51 |
| 2026-03-26 12:00 |
04:09:52.63 |
+21:57:14.9 |
HIP 19542 |
18.08 |
| 2026-03-27 00:00 |
04:10:08.99 |
+21:57:28.8 |
HIP 19542 |
14.48 |
| 2026-03-27 12:00 |
04:10:25.48 |
+21:57:43.1 |
HIP 19542 |
10.99 |
| 2026-03-28 00:00 |
04:10:42.09 |
+21:57:57.5 |
HIP 19542 |
7.81 |
| 2026-03-28 12:00 |
04:10:58.81 |
+21:58:12.3 |
HIP 19542 |
5.57 |
| 2026-03-29 00:00 |
04:11:15.65 |
+21:58:27.3 |
HIP 19558 |
5.40 |
| 2026-03-29 12:00 |
04:11:32.60 |
+21:58:42.7 |
HIP 19558 |
5.55 |
| 2026-03-30 00:00 |
04:11:49.68 |
+21:58:58.2 |
HIP 19558 |
7.98 |
| 2026-03-30 12:00 |
04:12:06.86 |
+21:59:14.1 |
HIP 19558 |
11.34 |
| 2026-03-31 00:00 |
04:12:24.16 |
+21:59:30.1 |
HIP 19558 |
15.03 |
| 2026-03-31 12:00 |
04:12:41.57 |
+21:59:46.5 |
HIP 19558 |
18.89 |
| 2026-04-01 00:00 |
04:12:59.09 |
+22:00:03.0 |
HIP 19558 |
22.83 |
| 2026-04-01 12:00 |
04:13:16.72 |
+22:00:19.8 |
HIP 19672 |
25.18 |
| 2026-04-02 00:00 |
04:13:34.46 |
+22:00:36.9 |
HIP 19797 |
24.87 |
| 2026-04-02 12:00 |
04:13:52.31 |
+22:00:54.2 |
HIP 19797 |
22.52 |
| 2026-04-03 00:00 |
04:14:10.27 |
+22:01:11.7 |
HIP 19797 |
20.74 |
| 2026-04-03 12:00 |
04:14:28.33 |
+22:01:29.4 |
HIP 19797 |
19.69 |
| 2026-04-04 00:00 |
04:14:46.50 |
+22:01:47.3 |
HIP 19797 |
19.50 |
| 2026-04-04 12:00 |
04:15:04.78 |
+22:02:05.4 |
HIP 19797 |
20.22 |
| 2026-04-05 00:00 |
04:15:23.16 |
+22:02:23.8 |
HIP 19934 |
18.12 |
| 2026-04-05 12:00 |
04:15:41.65 |
+22:02:42.3 |
HIP 19934 |
14.56 |
| 2026-04-06 00:00 |
04:16:00.24 |
+22:03:01.0 |
HIP 19934 |
11.51 |
| 2026-04-06 12:00 |
04:16:18.93 |
+22:03:20.0 |
HIP 19934 |
9.49 |
| 2026-04-07 00:00 |
04:16:37.72 |
+22:03:39.1 |
HIP 19934 |
9.25 |
| 2026-04-07 12:00 |
04:16:56.61 |
+22:03:58.4 |
HIP 19934 |
10.93 |
| 2026-04-08 00:00 |
04:17:15.61 |
+22:04:17.8 |
HIP 19934 |
13.88 |
| 2026-04-08 12:00 |
04:17:34.70 |
+22:04:37.5 |
HIP 20038 |
17.06 |
| 2026-04-09 00:00 |
04:17:53.89 |
+22:04:57.3 |
HIP 20038 |
16.30 |
| 2026-04-09 12:00 |
04:18:13.18 |
+22:05:17.2 |
HIP 20038 |
16.74 |
| 2026-04-10 00:00 |
04:18:32.56 |
+22:05:37.4 |
HIP 20038 |
18.31 |
| 2026-04-10 12:00 |
04:18:52.05 |
+22:05:57.6 |
HIP 20038 |
20.77 |
| 2026-04-11 00:00 |
04:19:11.62 |
+22:06:18.0 |
HIP 20186 |
20.72 |
| 2026-04-11 12:00 |
04:19:31.30 |
+22:06:38.6 |
HIP 20278 |
18.98 |
| 2026-04-12 00:00 |
04:19:51.06 |
+22:06:59.3 |
HIP 20278 |
14.69 |
| 2026-04-12 12:00 |
04:20:10.92 |
+22:07:20.1 |
HIP 20278 |
10.63 |
| 2026-04-13 00:00 |
04:20:30.87 |
+22:07:41.1 |
HIP 20278 |
7.24 |
| 2026-04-13 12:00 |
04:20:50.91 |
+22:08:02.2 |
HIP 20278 |
5.91 |
| 2026-04-14 00:00 |
04:21:11.05 |
+22:08:23.4 |
HIP 20278 |
7.81 |
| 2026-04-14 12:00 |
04:21:31.27 |
+22:08:44.7 |
HIP 20391 |
9.30 |
| 2026-04-15 00:00 |
04:21:51.58 |
+22:09:06.1 |
HIP 20391 |
6.53 |
| 2026-04-15 12:00 |
04:22:11.98 |
+22:09:27.7 |
HIP 20391 |
6.59 |
| 2026-04-16 00:00 |
04:22:32.47 |
+22:09:49.3 |
HIP 20391 |
9.46 |