メタデータ
| 項目 |
値 |
| Designation |
P/2025 U1 (Hogan) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2026-03-25T17:26:20.201280Z |
| Orbit solution date (soln_date, UTC) |
2026-04-14T13:42:28Z |
| Obs used |
83 |
| NEO |
- |
| M1 |
11.000 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-10-30T12:01:04.713600Z |
| Discovery magnitude (MPC) |
20.84 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2026-01-03.0000000 |
| e |
0.29440879 |
| q (au) |
4.165962 |
| a (au) |
5.904215 |
| i (deg) |
23.831732 |
| Ω (om, deg) |
234.960640 |
| ω (w, deg) |
263.992220 |
| M (ma, deg) |
354.385328 |
等級
散乱 + 全体線形
$$
M_a = (13.711 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.711 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-05-12 00:00 |
08:25:32.48 |
-04:59:49.4 |
HIP 41214 |
21.85 |
| 2026-05-12 12:00 |
08:25:54.32 |
-04:58:52.4 |
HIP 41214 |
25.06 |
| 2026-05-13 00:00 |
08:26:16.30 |
-04:57:56.6 |
HIP 41479 |
22.50 |
| 2026-05-13 12:00 |
08:26:38.44 |
-04:57:02.1 |
HIP 41479 |
18.46 |
| 2026-05-14 00:00 |
08:27:00.71 |
-04:56:08.8 |
HIP 41479 |
15.38 |
| 2026-05-14 12:00 |
08:27:23.14 |
-04:55:16.9 |
HIP 41479 |
13.95 |
| 2026-05-15 00:00 |
08:27:45.70 |
-04:54:26.2 |
HIP 41479 |
14.70 |
| 2026-05-15 12:00 |
08:28:08.41 |
-04:53:36.8 |
HIP 41479 |
17.39 |
| 2026-05-16 00:00 |
08:28:31.26 |
-04:52:48.7 |
HIP 41479 |
21.31 |
| 2026-05-16 12:00 |
08:28:54.24 |
-04:52:01.9 |
HIP 41479 |
25.93 |
| 2026-05-17 00:00 |
08:29:17.37 |
-04:51:16.4 |
HIP 41479 |
30.96 |
| 2026-05-17 12:00 |
08:29:40.63 |
-04:50:32.2 |
HIP 41479 |
36.24 |
| 2026-05-18 00:00 |
08:30:04.03 |
-04:49:49.2 |
HIP 41738 |
35.27 |
| 2026-05-18 12:00 |
08:30:27.57 |
-04:49:07.6 |
HIP 41876 |
32.57 |
| 2026-05-19 00:00 |
08:30:51.23 |
-04:48:27.3 |
HIP 41876 |
28.19 |
| 2026-05-19 12:00 |
08:31:15.04 |
-04:47:48.3 |
HIP 41876 |
24.43 |
| 2026-05-20 00:00 |
08:31:38.97 |
-04:47:10.6 |
HIP 41876 |
21.65 |
| 2026-05-20 12:00 |
08:32:03.03 |
-04:46:34.2 |
HIP 41876 |
20.27 |
| 2026-05-21 00:00 |
08:32:27.22 |
-04:45:59.1 |
HIP 41876 |
20.63 |
| 2026-05-21 12:00 |
08:32:51.54 |
-04:45:25.3 |
HIP 41876 |
22.64 |
| 2026-05-22 00:00 |
08:33:15.98 |
-04:44:52.8 |
HIP 41924 |
23.64 |
| 2026-05-22 12:00 |
08:33:40.55 |
-04:44:21.6 |
HIP 41924 |
25.43 |
| 2026-05-23 00:00 |
08:34:05.24 |
-04:43:51.7 |
HIP 42077 |
26.38 |
| 2026-05-23 12:00 |
08:34:30.05 |
-04:43:23.1 |
HIP 42077 |
25.91 |
| 2026-05-24 00:00 |
08:34:54.99 |
-04:42:55.8 |
HIP 42077 |
26.89 |
| 2026-05-24 12:00 |
08:35:20.04 |
-04:42:29.8 |
HIP 42077 |
29.18 |
| 2026-05-25 00:00 |
08:35:45.22 |
-04:42:05.2 |
HIP 42299 |
28.98 |
| 2026-05-25 12:00 |
08:36:10.51 |
-04:41:41.8 |
HIP 42299 |
23.89 |
| 2026-05-26 00:00 |
08:36:35.92 |
-04:41:19.6 |
HIP 42299 |
19.48 |
| 2026-05-26 12:00 |
08:37:01.44 |
-04:40:58.8 |
HIP 42299 |
16.37 |
| 2026-05-27 00:00 |
08:37:27.08 |
-04:40:39.3 |
HIP 42299 |
15.39 |
| 2026-05-27 12:00 |
08:37:52.83 |
-04:40:21.1 |
HIP 42299 |
16.94 |
| 2026-05-28 00:00 |
08:38:18.69 |
-04:40:04.2 |
HIP 42461 |
20.00 |
| 2026-05-28 12:00 |
08:38:44.67 |
-04:39:48.5 |
HIP 42461 |
15.38 |
| 2026-05-29 00:00 |
08:39:10.76 |
-04:39:34.1 |
HIP 42461 |
12.51 |
| 2026-05-29 12:00 |
08:39:36.95 |
-04:39:21.1 |
HIP 42461 |
12.68 |
| 2026-05-30 00:00 |
08:40:03.25 |
-04:39:09.3 |
HIP 42461 |
15.81 |
| 2026-05-30 12:00 |
08:40:29.66 |
-04:38:58.7 |
HIP 42634 |
15.47 |
| 2026-05-31 00:00 |
08:40:56.18 |
-04:38:49.5 |
HIP 42634 |
11.19 |
| 2026-05-31 12:00 |
08:41:22.80 |
-04:38:41.6 |
HIP 42634 |
9.90 |
| 2026-06-01 00:00 |
08:41:49.53 |
-04:38:34.9 |
HIP 42634 |
12.60 |
| 2026-06-01 12:00 |
08:42:16.36 |
-04:38:29.5 |
HIP 42759 |
8.24 |
| 2026-06-02 00:00 |
08:42:43.29 |
-04:38:25.4 |
HIP 42759 |
1.77 |