P/2021 R4 (Wierzchos)
メタデータ
| 項目 |
値 |
| Designation |
P/2021 R4 (Wierzchos) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-10-13T22:05:15.889920Z |
| Orbit solution date (soln_date, UTC) |
2021-11-20T19:13:09Z |
| Obs used |
76 |
| NEO |
- |
| M1 |
16.300 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-09-06T09:39:32.976000Z |
| Discovery magnitude (MPC) |
21.16 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) |
2021-09-24.0000000 |
| e |
0.58615107 |
| q (au) |
2.325993 |
| a (au) |
5.620391 |
| i (deg) |
21.040112 |
| Ω (om, deg) |
321.256290 |
| ω (w, deg) |
56.624470 |
| M (ma, deg) |
358.526498 |
等級
散乱 + 全体線形
$$
M_a = (16.369 + 2.943\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.369 |
| n |
2.943 |
| gf |
0.970 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
9.997 |
| 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 |
11:36:43.38 |
-11:37:15.6 |
HIP 56798 |
36.28 |
| 2026-02-03 12:00 |
11:36:34.55 |
-11:37:17.8 |
HIP 56494 |
37.09 |
| 2026-02-04 00:00 |
11:36:25.62 |
-11:37:19.2 |
HIP 56494 |
35.67 |
| 2026-02-04 12:00 |
11:36:16.60 |
-11:37:19.6 |
HIP 56494 |
34.34 |
| 2026-02-05 00:00 |
11:36:07.48 |
-11:37:19.1 |
HIP 56494 |
33.10 |
| 2026-02-05 12:00 |
11:35:58.27 |
-11:37:17.6 |
HIP 56494 |
31.97 |
| 2026-02-06 00:00 |
11:35:48.97 |
-11:37:15.2 |
HIP 56494 |
30.96 |
| 2026-02-06 12:00 |
11:35:39.57 |
-11:37:11.9 |
HIP 56494 |
30.10 |
| 2026-02-07 00:00 |
11:35:30.09 |
-11:37:07.7 |
HIP 56494 |
29.41 |
| 2026-02-07 12:00 |
11:35:20.52 |
-11:37:02.5 |
HIP 56494 |
28.89 |
| 2026-02-08 00:00 |
11:35:10.85 |
-11:36:56.4 |
HIP 56494 |
28.58 |
| 2026-02-08 12:00 |
11:35:01.11 |
-11:36:49.4 |
HIP 56494 |
28.47 |
| 2026-02-09 00:00 |
11:34:51.27 |
-11:36:41.5 |
HIP 56494 |
28.57 |
| 2026-02-09 12:00 |
11:34:41.35 |
-11:36:32.6 |
HIP 56494 |
28.90 |
| 2026-02-10 00:00 |
11:34:31.35 |
-11:36:22.8 |
HIP 56494 |
29.44 |
| 2026-02-10 12:00 |
11:34:21.26 |
-11:36:12.1 |
HIP 56494 |
30.19 |
| 2026-02-11 00:00 |
11:34:11.09 |
-11:36:00.5 |
HIP 56494 |
31.15 |
| 2026-02-11 12:00 |
11:34:00.84 |
-11:35:48.0 |
HIP 56266 |
29.20 |
| 2026-02-12 00:00 |
11:33:50.52 |
-11:35:34.5 |
HIP 56266 |
26.72 |
| 2026-02-12 12:00 |
11:33:40.11 |
-11:35:20.1 |
HIP 56266 |
24.25 |
| 2026-02-13 00:00 |
11:33:29.62 |
-11:35:04.8 |
HIP 56266 |
21.77 |
| 2026-02-13 12:00 |
11:33:19.07 |
-11:34:48.7 |
HIP 56266 |
19.31 |
| 2026-02-14 00:00 |
11:33:08.43 |
-11:34:31.6 |
HIP 56266 |
16.88 |
| 2026-02-14 12:00 |
11:32:57.72 |
-11:34:13.6 |
HIP 56266 |
14.50 |
| 2026-02-15 00:00 |
11:32:46.94 |
-11:33:54.7 |
HIP 56266 |
12.22 |
| 2026-02-15 12:00 |
11:32:36.09 |
-11:33:34.9 |
HIP 56266 |
10.11 |
| 2026-02-16 00:00 |
11:32:25.17 |
-11:33:14.2 |
HIP 56266 |
8.35 |
| 2026-02-16 12:00 |
11:32:14.19 |
-11:32:52.6 |
HIP 56266 |
7.19 |
| 2026-02-17 00:00 |
11:32:03.13 |
-11:32:30.1 |
HIP 56266 |
6.98 |
| 2026-02-17 12:00 |
11:31:52.01 |
-11:32:06.8 |
HIP 56266 |
7.81 |
| 2026-02-18 00:00 |
11:31:40.83 |
-11:31:42.6 |
HIP 56266 |
9.42 |
| 2026-02-18 12:00 |
11:31:29.58 |
-11:31:17.5 |
HIP 56266 |
11.50 |
| 2026-02-19 00:00 |
11:31:18.28 |
-11:30:51.5 |
HIP 56266 |
13.85 |
| 2026-02-19 12:00 |
11:31:06.91 |
-11:30:24.7 |
HIP 56266 |
16.37 |
| 2026-02-20 00:00 |
11:30:55.49 |
-11:29:57.0 |
HIP 56266 |
18.99 |
| 2026-02-20 12:00 |
11:30:44.00 |
-11:29:28.4 |
HIP 56266 |
21.68 |
| 2026-02-21 00:00 |
11:30:32.47 |
-11:28:59.0 |
HIP 56266 |
24.43 |
| 2026-02-21 12:00 |
11:30:20.88 |
-11:28:28.8 |
HIP 56266 |
27.22 |
| 2026-02-22 00:00 |
11:30:09.24 |
-11:27:57.7 |
HIP 56271 |
30.01 |
| 2026-02-22 12:00 |
11:29:57.54 |
-11:27:25.8 |
HIP 56271 |
32.72 |
| 2026-02-23 00:00 |
11:29:45.80 |
-11:26:53.1 |
HIP 56271 |
35.48 |
| 2026-02-23 12:00 |
11:29:34.01 |
-11:26:19.6 |
HIP 55942 |
33.19 |
| 2026-02-24 00:00 |
11:29:22.18 |
-11:25:45.2 |
HIP 55942 |
30.71 |