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) |
| 2026-09-20 00:00 |
11:26:32.89 |
-24:19:50.9 |
HIP 55892 |
14.63 |
| 2026-09-20 12:00 |
11:26:45.23 |
-24:21:00.4 |
HIP 55892 |
13.56 |
| 2026-09-21 00:00 |
11:26:57.56 |
-24:22:10.3 |
HIP 55892 |
13.13 |
| 2026-09-21 12:00 |
11:27:09.87 |
-24:23:20.7 |
HIP 55892 |
13.41 |
| 2026-09-22 00:00 |
11:27:22.18 |
-24:24:31.5 |
HIP 55892 |
14.34 |
| 2026-09-22 12:00 |
11:27:34.47 |
-24:25:42.8 |
HIP 55892 |
15.83 |
| 2026-09-23 00:00 |
11:27:46.75 |
-24:26:54.6 |
HIP 55892 |
17.72 |
| 2026-09-23 12:00 |
11:27:59.02 |
-24:28:06.8 |
HIP 55892 |
19.91 |
| 2026-09-24 00:00 |
11:28:11.27 |
-24:29:19.5 |
HIP 56025 |
19.86 |
| 2026-09-24 12:00 |
11:28:23.51 |
-24:30:32.6 |
HIP 56078 |
17.31 |
| 2026-09-25 00:00 |
11:28:35.74 |
-24:31:46.1 |
HIP 56078 |
14.84 |
| 2026-09-25 12:00 |
11:28:47.95 |
-24:33:00.1 |
HIP 56078 |
12.63 |
| 2026-09-26 00:00 |
11:29:00.14 |
-24:34:14.6 |
HIP 56078 |
10.85 |
| 2026-09-26 12:00 |
11:29:12.32 |
-24:35:29.4 |
HIP 56078 |
9.71 |
| 2026-09-27 00:00 |
11:29:24.48 |
-24:36:44.7 |
HIP 56078 |
9.47 |
| 2026-09-27 12:00 |
11:29:36.62 |
-24:38:00.4 |
HIP 56078 |
10.17 |
| 2026-09-28 00:00 |
11:29:48.75 |
-24:39:16.5 |
HIP 56078 |
11.66 |
| 2026-09-28 12:00 |
11:30:00.86 |
-24:40:33.1 |
HIP 56078 |
13.67 |
| 2026-09-29 00:00 |
11:30:12.95 |
-24:41:50.1 |
HIP 56078 |
16.02 |
| 2026-09-29 12:00 |
11:30:25.02 |
-24:43:07.4 |
HIP 56078 |
18.56 |
| 2026-09-30 00:00 |
11:30:37.07 |
-24:44:25.2 |
HIP 56085 |
19.60 |
| 2026-09-30 12:00 |
11:30:49.10 |
-24:45:43.4 |
HIP 56248 |
19.02 |
| 2026-10-01 00:00 |
11:31:01.11 |
-24:47:02.0 |
HIP 56248 |
18.23 |
| 2026-10-01 12:00 |
11:31:13.10 |
-24:48:21.1 |
HIP 56248 |
17.92 |
| 2026-10-02 00:00 |
11:31:25.07 |
-24:49:40.5 |
HIP 56248 |
18.13 |
| 2026-10-02 12:00 |
11:31:37.02 |
-24:51:00.3 |
HIP 56248 |
18.84 |
| 2026-10-03 00:00 |
11:31:48.94 |
-24:52:20.4 |
HIP 56248 |
19.99 |
| 2026-10-03 12:00 |
11:32:00.85 |
-24:53:41.0 |
HIP 56248 |
21.51 |
| 2026-10-04 00:00 |
11:32:12.73 |
-24:55:02.0 |
HIP 56248 |
23.33 |
| 2026-10-04 12:00 |
11:32:24.58 |
-24:56:23.3 |
HIP 56248 |
25.39 |
| 2026-10-05 00:00 |
11:32:36.41 |
-24:57:45.1 |
HIP 56248 |
27.62 |
| 2026-10-05 12:00 |
11:32:48.21 |
-24:59:07.2 |
HIP 56248 |
29.99 |
| 2026-10-06 00:00 |
11:33:00.00 |
-25:00:29.6 |
HIP 56451 |
27.14 |
| 2026-10-06 12:00 |
11:33:11.75 |
-25:01:52.5 |
HIP 56451 |
24.26 |
| 2026-10-07 00:00 |
11:33:23.47 |
-25:03:15.7 |
HIP 56451 |
21.41 |
| 2026-10-07 12:00 |
11:33:35.17 |
-25:04:39.2 |
HIP 56451 |
18.61 |
| 2026-10-08 00:00 |
11:33:46.84 |
-25:06:03.1 |
HIP 56451 |
15.88 |
| 2026-10-08 12:00 |
11:33:58.48 |
-25:07:27.4 |
HIP 56451 |
13.26 |
| 2026-10-09 00:00 |
11:34:10.10 |
-25:08:52.0 |
HIP 56451 |
10.82 |
| 2026-10-09 12:00 |
11:34:21.68 |
-25:10:17.0 |
HIP 56451 |
8.72 |
| 2026-10-10 00:00 |
11:34:33.23 |
-25:11:42.3 |
HIP 56451 |
7.27 |
| 2026-10-10 12:00 |
11:34:44.76 |
-25:13:07.9 |
HIP 56451 |
6.86 |
| 2026-10-11 00:00 |
11:34:56.25 |
-25:14:33.9 |
HIP 56451 |
7.67 |