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 · University of Arizona 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 |
0.999 |
| 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) |
| 2026-07-29 00:00 |
11:05:28.02 |
-23:12:00.8 |
HIP 54149 |
27.59 |
| 2026-07-29 12:00 |
11:05:38.61 |
-23:12:03.9 |
HIP 54329 |
27.07 |
| 2026-07-30 00:00 |
11:05:49.25 |
-23:12:07.8 |
HIP 54329 |
25.58 |
| 2026-07-30 12:00 |
11:05:59.93 |
-23:12:12.4 |
HIP 54329 |
24.22 |
| 2026-07-31 00:00 |
11:06:10.66 |
-23:12:17.8 |
HIP 54329 |
23.04 |
| 2026-07-31 12:00 |
11:06:21.42 |
-23:12:23.9 |
HIP 54329 |
22.06 |
| 2026-08-01 00:00 |
11:06:32.23 |
-23:12:30.7 |
HIP 54329 |
21.30 |
| 2026-08-01 12:00 |
11:06:43.07 |
-23:12:38.3 |
HIP 54329 |
20.80 |
| 2026-08-02 00:00 |
11:06:53.96 |
-23:12:46.6 |
HIP 54329 |
20.58 |
| 2026-08-02 12:00 |
11:07:04.88 |
-23:12:55.6 |
HIP 54329 |
20.65 |
| 2026-08-03 00:00 |
11:07:15.84 |
-23:13:05.4 |
HIP 54329 |
21.01 |
| 2026-08-03 12:00 |
11:07:26.84 |
-23:13:15.9 |
HIP 54329 |
21.66 |
| 2026-08-04 00:00 |
11:07:37.88 |
-23:13:27.1 |
HIP 54329 |
22.56 |
| 2026-08-04 12:00 |
11:07:48.96 |
-23:13:39.0 |
HIP 54329 |
23.70 |
| 2026-08-05 00:00 |
11:08:00.07 |
-23:13:51.7 |
HIP 54329 |
25.04 |
| 2026-08-05 12:00 |
11:08:11.22 |
-23:14:05.1 |
HIP 54329 |
26.56 |
| 2026-08-06 00:00 |
11:08:22.41 |
-23:14:19.2 |
HIP 54329 |
28.23 |
| 2026-08-06 12:00 |
11:08:33.63 |
-23:14:34.0 |
HIP 54329 |
30.03 |
| 2026-08-07 00:00 |
11:08:44.89 |
-23:14:49.5 |
HIP 54329 |
31.93 |
| 2026-08-07 12:00 |
11:08:56.18 |
-23:15:05.8 |
HIP 54329 |
33.93 |
| 2026-08-08 00:00 |
11:09:07.51 |
-23:15:22.8 |
HIP 54601 |
33.77 |
| 2026-08-08 12:00 |
11:09:18.87 |
-23:15:40.4 |
HIP 54601 |
32.63 |
| 2026-08-09 00:00 |
11:09:30.26 |
-23:15:58.8 |
HIP 54601 |
31.67 |
| 2026-08-09 12:00 |
11:09:41.69 |
-23:16:17.9 |
HIP 54601 |
30.91 |
| 2026-08-10 00:00 |
11:09:53.14 |
-23:16:37.8 |
HIP 54601 |
30.38 |
| 2026-08-10 12:00 |
11:10:04.63 |
-23:16:58.3 |
HIP 54601 |
30.08 |
| 2026-08-11 00:00 |
11:10:16.16 |
-23:17:19.5 |
HIP 54601 |
30.03 |
| 2026-08-11 12:00 |
11:10:27.71 |
-23:17:41.4 |
HIP 54601 |
30.23 |
| 2026-08-12 00:00 |
11:10:39.29 |
-23:18:04.1 |
HIP 54601 |
30.67 |
| 2026-08-12 12:00 |
11:10:50.90 |
-23:18:27.4 |
HIP 54682 |
31.00 |
| 2026-08-13 00:00 |
11:11:02.54 |
-23:18:51.4 |
HIP 54682 |
30.53 |
| 2026-08-13 12:00 |
11:11:14.21 |
-23:19:16.2 |
HIP 54682 |
30.30 |
| 2026-08-14 00:00 |
11:11:25.91 |
-23:19:41.6 |
HIP 54682 |
30.32 |
| 2026-08-14 12:00 |
11:11:37.63 |
-23:20:07.7 |
HIP 54682 |
30.59 |
| 2026-08-15 00:00 |
11:11:49.38 |
-23:20:34.5 |
HIP 54682 |
31.12 |
| 2026-08-15 12:00 |
11:12:01.16 |
-23:21:01.9 |
HIP 54771 |
30.13 |
| 2026-08-16 00:00 |
11:12:12.96 |
-23:21:30.1 |
HIP 54771 |
28.84 |
| 2026-08-16 12:00 |
11:12:24.79 |
-23:21:58.9 |
HIP 54771 |
27.74 |
| 2026-08-17 00:00 |
11:12:36.64 |
-23:22:28.5 |
HIP 54771 |
26.87 |
| 2026-08-17 12:00 |
11:12:48.52 |
-23:22:58.6 |
HIP 54843 |
26.02 |
| 2026-08-18 00:00 |
11:13:00.42 |
-23:23:29.5 |
HIP 54843 |
25.35 |
| 2026-08-18 12:00 |
11:13:12.34 |
-23:24:01.0 |
HIP 54843 |
24.98 |
| 2026-08-19 00:00 |
11:13:24.28 |
-23:24:33.2 |
HIP 54924 |
24.22 |