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) |
| 2026-03-26 00:00 |
11:17:05.09 |
-10:31:09.1 |
HIP 55027 |
18.01 |
| 2026-03-26 12:00 |
11:16:53.33 |
-10:29:59.8 |
HIP 55027 |
15.78 |
| 2026-03-27 00:00 |
11:16:41.62 |
-10:28:50.2 |
HIP 55027 |
13.91 |
| 2026-03-27 12:00 |
11:16:29.96 |
-10:27:40.4 |
HIP 55027 |
12.54 |
| 2026-03-28 00:00 |
11:16:18.36 |
-10:26:30.3 |
HIP 55027 |
11.85 |
| 2026-03-28 12:00 |
11:16:06.80 |
-10:25:20.1 |
HIP 55027 |
11.95 |
| 2026-03-29 00:00 |
11:15:55.30 |
-10:24:09.5 |
HIP 55027 |
12.81 |
| 2026-03-29 12:00 |
11:15:43.86 |
-10:22:58.8 |
HIP 55027 |
14.28 |
| 2026-03-30 00:00 |
11:15:32.47 |
-10:21:47.9 |
HIP 55027 |
16.21 |
| 2026-03-30 12:00 |
11:15:21.14 |
-10:20:36.7 |
HIP 55027 |
18.43 |
| 2026-03-31 00:00 |
11:15:09.87 |
-10:19:25.4 |
HIP 55027 |
20.85 |
| 2026-03-31 12:00 |
11:14:58.66 |
-10:18:13.9 |
HIP 55027 |
23.40 |
| 2026-04-01 00:00 |
11:14:47.51 |
-10:17:02.3 |
HIP 55027 |
26.04 |
| 2026-04-01 12:00 |
11:14:36.43 |
-10:15:50.5 |
HIP 55027 |
28.74 |
| 2026-04-02 00:00 |
11:14:25.40 |
-10:14:38.6 |
HIP 54737 |
30.19 |
| 2026-04-02 12:00 |
11:14:14.45 |
-10:13:26.5 |
HIP 54737 |
27.31 |
| 2026-04-03 00:00 |
11:14:03.56 |
-10:12:14.3 |
HIP 54737 |
24.48 |
| 2026-04-03 12:00 |
11:13:52.73 |
-10:11:02.0 |
HIP 54737 |
21.69 |
| 2026-04-04 00:00 |
11:13:41.98 |
-10:09:49.6 |
HIP 54737 |
18.95 |
| 2026-04-04 12:00 |
11:13:31.29 |
-10:08:37.1 |
HIP 54737 |
16.29 |
| 2026-04-05 00:00 |
11:13:20.68 |
-10:07:24.6 |
HIP 54737 |
13.74 |
| 2026-04-05 12:00 |
11:13:10.13 |
-10:06:11.9 |
HIP 54737 |
11.37 |
| 2026-04-06 00:00 |
11:12:59.66 |
-10:04:59.2 |
HIP 54737 |
9.29 |
| 2026-04-06 12:00 |
11:12:49.27 |
-10:03:46.5 |
HIP 54739 |
7.18 |
| 2026-04-07 00:00 |
11:12:38.95 |
-10:02:33.7 |
HIP 54739 |
4.61 |
| 2026-04-07 12:00 |
11:12:28.70 |
-10:01:20.9 |
HIP 54739 |
2.59 |
| 2026-04-08 00:00 |
11:12:18.54 |
-10:00:08.0 |
HIP 54739 |
2.79 |
| 2026-04-08 12:00 |
11:12:08.45 |
-09:58:55.2 |
HIP 54739 |
4.92 |
| 2026-04-09 00:00 |
11:11:58.44 |
-09:57:42.4 |
HIP 54739 |
7.45 |
| 2026-04-09 12:00 |
11:11:48.51 |
-09:56:29.5 |
HIP 54739 |
10.08 |
| 2026-04-10 00:00 |
11:11:38.67 |
-09:55:16.7 |
HIP 54739 |
12.73 |
| 2026-04-10 12:00 |
11:11:28.90 |
-09:54:04.0 |
HIP 54739 |
15.38 |
| 2026-04-11 00:00 |
11:11:19.22 |
-09:52:51.3 |
HIP 54739 |
18.03 |
| 2026-04-11 12:00 |
11:11:09.63 |
-09:51:38.6 |
HIP 54739 |
20.66 |
| 2026-04-12 00:00 |
11:11:00.12 |
-09:50:26.0 |
HIP 54739 |
23.28 |
| 2026-04-12 12:00 |
11:10:50.69 |
-09:49:13.5 |
HIP 54609 |
24.58 |
| 2026-04-13 00:00 |
11:10:41.36 |
-09:48:01.0 |
HIP 54609 |
23.09 |
| 2026-04-13 12:00 |
11:10:32.11 |
-09:46:48.7 |
HIP 54609 |
21.81 |
| 2026-04-14 00:00 |
11:10:22.96 |
-09:45:36.5 |
HIP 54609 |
20.77 |
| 2026-04-14 12:00 |
11:10:13.89 |
-09:44:24.4 |
HIP 54609 |
20.00 |
| 2026-04-15 00:00 |
11:10:04.92 |
-09:43:12.4 |
HIP 54609 |
19.53 |
| 2026-04-15 12:00 |
11:09:56.03 |
-09:42:00.5 |
HIP 54609 |
19.37 |
| 2026-04-16 00:00 |
11:09:47.25 |
-09:40:48.9 |
HIP 54609 |
19.51 |