P/2021 U1 (Wierzchos)
メタデータ
| 項目 |
値 |
| Designation |
P/2021 U1 (Wierzchos) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-09-30T23:25:09.215040Z |
| Orbit solution date (soln_date, UTC) |
2022-03-08T19:43:48Z |
| Obs used |
239 |
| NEO |
- |
| M1 |
16.000 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-10-18T08:26:24.028800Z |
| Discovery magnitude (MPC) |
19.17 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) |
2021-11-26.0000000 |
| e |
0.71275870 |
| q (au) |
2.444983 |
| a (au) |
8.511949 |
| i (deg) |
30.560647 |
| Ω (om, deg) |
246.789455 |
| ω (w, deg) |
145.044255 |
| M (ma, deg) |
2.223495 |
等級
散乱 + 全体線形
$$
M_a = (14.832 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.832 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
11:18:38.56 |
-29:17:43.5 |
HIP 55176 |
12.76 |
| 2026-02-03 12:00 |
11:18:30.20 |
-29:18:00.9 |
HIP 55176 |
11.07 |
| 2026-02-04 00:00 |
11:18:21.76 |
-29:18:17.2 |
HIP 55176 |
9.44 |
| 2026-02-04 12:00 |
11:18:13.24 |
-29:18:32.5 |
HIP 55176 |
7.91 |
| 2026-02-05 00:00 |
11:18:04.66 |
-29:18:46.6 |
HIP 55176 |
6.57 |
| 2026-02-05 12:00 |
11:17:56.00 |
-29:18:59.6 |
HIP 55176 |
5.56 |
| 2026-02-06 00:00 |
11:17:47.27 |
-29:19:11.5 |
HIP 55176 |
5.11 |
| 2026-02-06 12:00 |
11:17:38.47 |
-29:19:22.2 |
HIP 55176 |
5.38 |
| 2026-02-07 00:00 |
11:17:29.60 |
-29:19:31.9 |
HIP 55176 |
6.28 |
| 2026-02-07 12:00 |
11:17:20.67 |
-29:19:40.4 |
HIP 55176 |
7.60 |
| 2026-02-08 00:00 |
11:17:11.66 |
-29:19:47.8 |
HIP 55176 |
9.18 |
| 2026-02-08 12:00 |
11:17:02.59 |
-29:19:54.1 |
HIP 55176 |
10.90 |
| 2026-02-09 00:00 |
11:16:53.46 |
-29:19:59.2 |
HIP 55176 |
12.72 |
| 2026-02-09 12:00 |
11:16:44.26 |
-29:20:03.2 |
HIP 55176 |
14.60 |
| 2026-02-10 00:00 |
11:16:34.99 |
-29:20:06.1 |
HIP 55176 |
16.53 |
| 2026-02-10 12:00 |
11:16:25.67 |
-29:20:07.9 |
HIP 55008 |
15.83 |
| 2026-02-11 00:00 |
11:16:16.28 |
-29:20:08.5 |
HIP 55008 |
14.81 |
| 2026-02-11 12:00 |
11:16:06.84 |
-29:20:08.0 |
HIP 55008 |
14.03 |
| 2026-02-12 00:00 |
11:15:57.34 |
-29:20:06.3 |
HIP 54970 |
13.37 |
| 2026-02-12 12:00 |
11:15:47.77 |
-29:20:03.5 |
HIP 54970 |
12.31 |
| 2026-02-13 00:00 |
11:15:38.16 |
-29:19:59.5 |
HIP 54970 |
11.55 |
| 2026-02-13 12:00 |
11:15:28.49 |
-29:19:54.4 |
HIP 54970 |
11.16 |
| 2026-02-14 00:00 |
11:15:18.76 |
-29:19:48.2 |
HIP 54970 |
11.18 |
| 2026-02-14 12:00 |
11:15:08.98 |
-29:19:40.8 |
HIP 54970 |
11.61 |
| 2026-02-15 00:00 |
11:14:59.15 |
-29:19:32.3 |
HIP 54970 |
12.42 |
| 2026-02-15 12:00 |
11:14:49.27 |
-29:19:22.6 |
HIP 54970 |
13.55 |
| 2026-02-16 00:00 |
11:14:39.34 |
-29:19:11.8 |
HIP 54970 |
14.93 |
| 2026-02-16 12:00 |
11:14:29.36 |
-29:18:59.8 |
HIP 54970 |
16.50 |
| 2026-02-17 00:00 |
11:14:19.34 |
-29:18:46.7 |
HIP 54970 |
18.22 |
| 2026-02-17 12:00 |
11:14:09.27 |
-29:18:32.4 |
HIP 54970 |
20.05 |
| 2026-02-18 00:00 |
11:13:59.16 |
-29:18:17.0 |
HIP 54970 |
21.97 |
| 2026-02-18 12:00 |
11:13:49.01 |
-29:18:00.5 |
HIP 54970 |
23.96 |
| 2026-02-19 00:00 |
11:13:38.81 |
-29:17:42.8 |
HIP 54970 |
26.00 |
| 2026-02-19 12:00 |
11:13:28.58 |
-29:17:24.0 |
HIP 54690 |
24.11 |
| 2026-02-20 00:00 |
11:13:18.30 |
-29:17:04.0 |
HIP 54690 |
22.23 |
| 2026-02-20 12:00 |
11:13:07.99 |
-29:16:42.9 |
HIP 54690 |
20.42 |
| 2026-02-21 00:00 |
11:12:57.64 |
-29:16:20.7 |
HIP 54690 |
18.73 |
| 2026-02-21 12:00 |
11:12:47.26 |
-29:15:57.3 |
HIP 54690 |
17.17 |
| 2026-02-22 00:00 |
11:12:36.85 |
-29:15:32.8 |
HIP 54690 |
15.81 |
| 2026-02-22 12:00 |
11:12:26.40 |
-29:15:07.2 |
HIP 54690 |
14.69 |
| 2026-02-23 00:00 |
11:12:15.93 |
-29:14:40.4 |
HIP 54690 |
13.88 |
| 2026-02-23 12:00 |
11:12:05.43 |
-29:14:12.6 |
HIP 54690 |
13.46 |
| 2026-02-24 00:00 |
11:11:54.89 |
-29:13:43.6 |
HIP 54690 |
13.44 |