メタデータ
| 項目 |
値 |
| Designation |
P/2020 WJ5 (Lemmon) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-07-01T10:23:55.633920Z |
| Orbit solution date (soln_date, UTC) |
2024-08-11T00:12:20Z |
| Obs used |
720 |
| NEO |
- |
| M1 |
12.300 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-12-17.0000000 |
| e |
0.17132992 |
| q (au) |
4.985837 |
| a (au) |
6.016673 |
| i (deg) |
22.294439 |
| Ω (om, deg) |
177.810718 |
| ω (w, deg) |
338.229837 |
| M (ma, deg) |
35.633474 |
等級
散乱 + 全体線形
$$
M_a = (3.028 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.028 |
| n |
6.000 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
19:16:56.29 |
-01:19:08.7 |
HIP 94854 |
24.91 |
| 2026-09-20 12:00 |
19:16:56.77 |
-01:20:55.3 |
HIP 94854 |
26.19 |
| 2026-09-21 00:00 |
19:16:57.40 |
-01:22:41.6 |
HIP 94854 |
27.49 |
| 2026-09-21 12:00 |
19:16:58.18 |
-01:24:27.7 |
HIP 94854 |
28.83 |
| 2026-09-22 00:00 |
19:16:59.10 |
-01:26:13.6 |
HIP 94854 |
30.19 |
| 2026-09-22 12:00 |
19:17:00.16 |
-01:27:59.2 |
HIP 94766 |
28.84 |
| 2026-09-23 00:00 |
19:17:01.38 |
-01:29:44.6 |
HIP 94766 |
27.09 |
| 2026-09-23 12:00 |
19:17:02.74 |
-01:31:29.7 |
HIP 94766 |
25.36 |
| 2026-09-24 00:00 |
19:17:04.24 |
-01:33:14.5 |
HIP 94766 |
23.63 |
| 2026-09-24 12:00 |
19:17:05.90 |
-01:34:59.0 |
HIP 94766 |
21.93 |
| 2026-09-25 00:00 |
19:17:07.70 |
-01:36:43.3 |
HIP 94766 |
20.24 |
| 2026-09-25 12:00 |
19:17:09.64 |
-01:38:27.3 |
HIP 94766 |
18.59 |
| 2026-09-26 00:00 |
19:17:11.73 |
-01:40:10.9 |
HIP 94766 |
16.99 |
| 2026-09-26 12:00 |
19:17:13.96 |
-01:41:54.3 |
HIP 94766 |
15.44 |
| 2026-09-27 00:00 |
19:17:16.34 |
-01:43:37.3 |
HIP 94766 |
13.97 |
| 2026-09-27 12:00 |
19:17:18.86 |
-01:45:20.0 |
HIP 94766 |
12.61 |
| 2026-09-28 00:00 |
19:17:21.53 |
-01:47:02.4 |
HIP 94766 |
11.40 |
| 2026-09-28 12:00 |
19:17:24.35 |
-01:48:44.4 |
HIP 94766 |
10.41 |
| 2026-09-29 00:00 |
19:17:27.30 |
-01:50:26.1 |
HIP 94766 |
9.69 |
| 2026-09-29 12:00 |
19:17:30.40 |
-01:52:07.5 |
HIP 94766 |
9.33 |
| 2026-09-30 00:00 |
19:17:33.65 |
-01:53:48.4 |
HIP 94766 |
9.37 |
| 2026-09-30 12:00 |
19:17:37.04 |
-01:55:29.1 |
HIP 94766 |
9.81 |
| 2026-10-01 00:00 |
19:17:40.57 |
-01:57:09.3 |
HIP 94766 |
10.61 |
| 2026-10-01 12:00 |
19:17:44.25 |
-01:58:49.2 |
HIP 94766 |
11.69 |
| 2026-10-02 00:00 |
19:17:48.07 |
-02:00:28.7 |
HIP 94766 |
13.00 |
| 2026-10-02 12:00 |
19:17:52.03 |
-02:02:07.9 |
HIP 94766 |
14.47 |
| 2026-10-03 00:00 |
19:17:56.13 |
-02:03:46.6 |
HIP 94766 |
16.07 |
| 2026-10-03 12:00 |
19:18:00.38 |
-02:05:24.9 |
HIP 94766 |
17.77 |
| 2026-10-04 00:00 |
19:18:04.77 |
-02:07:02.8 |
HIP 94766 |
19.54 |
| 2026-10-04 12:00 |
19:18:09.30 |
-02:08:40.3 |
HIP 94766 |
21.37 |
| 2026-10-05 00:00 |
19:18:13.98 |
-02:10:17.4 |
HIP 94766 |
23.25 |
| 2026-10-05 12:00 |
19:18:18.79 |
-02:11:54.0 |
HIP 94766 |
25.17 |
| 2026-10-06 00:00 |
19:18:23.75 |
-02:13:30.3 |
HIP 94766 |
27.13 |
| 2026-10-06 12:00 |
19:18:28.85 |
-02:15:06.0 |
HIP 94766 |
29.12 |
| 2026-10-07 00:00 |
19:18:34.09 |
-02:16:41.4 |
HIP 94766 |
31.13 |
| 2026-10-07 12:00 |
19:18:39.47 |
-02:18:16.2 |
HIP 95076 |
31.15 |
| 2026-10-08 00:00 |
19:18:44.99 |
-02:19:50.6 |
HIP 95076 |
29.34 |
| 2026-10-08 12:00 |
19:18:50.65 |
-02:21:24.6 |
HIP 95076 |
27.55 |
| 2026-10-09 00:00 |
19:18:56.46 |
-02:22:58.0 |
HIP 95076 |
25.77 |
| 2026-10-09 12:00 |
19:19:02.40 |
-02:24:31.0 |
HIP 95076 |
24.02 |
| 2026-10-10 00:00 |
19:19:08.48 |
-02:26:03.5 |
HIP 95076 |
22.30 |
| 2026-10-10 12:00 |
19:19:14.70 |
-02:27:35.5 |
HIP 95076 |
20.63 |
| 2026-10-11 00:00 |
19:19:21.05 |
-02:29:07.0 |
HIP 95076 |
19.03 |