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 |
-0.997 |
| 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) |
| 2026-03-26 00:00 |
19:42:56.12 |
-01:01:28.3 |
HIP 97187 |
39.91 |
| 2026-03-26 12:00 |
19:43:07.92 |
-00:59:50.3 |
HIP 97187 |
36.54 |
| 2026-03-27 00:00 |
19:43:19.60 |
-00:58:12.3 |
HIP 97187 |
33.20 |
| 2026-03-27 12:00 |
19:43:31.16 |
-00:56:34.1 |
HIP 97187 |
29.88 |
| 2026-03-28 00:00 |
19:43:42.61 |
-00:54:55.9 |
HIP 97187 |
26.59 |
| 2026-03-28 12:00 |
19:43:53.93 |
-00:53:17.7 |
HIP 97187 |
23.32 |
| 2026-03-29 00:00 |
19:44:05.14 |
-00:51:39.3 |
HIP 97187 |
20.08 |
| 2026-03-29 12:00 |
19:44:16.24 |
-00:50:00.9 |
HIP 97187 |
16.87 |
| 2026-03-30 00:00 |
19:44:27.21 |
-00:48:22.5 |
HIP 97187 |
13.68 |
| 2026-03-30 12:00 |
19:44:38.06 |
-00:46:44.0 |
HIP 97187 |
10.52 |
| 2026-03-31 00:00 |
19:44:48.79 |
-00:45:05.5 |
HIP 97187 |
7.39 |
| 2026-03-31 12:00 |
19:44:59.40 |
-00:43:26.9 |
HIP 97187 |
4.30 |
| 2026-04-01 00:00 |
19:45:09.89 |
-00:41:48.3 |
HIP 97187 |
1.39 |
| 2026-04-01 12:00 |
19:45:20.26 |
-00:40:09.7 |
HIP 97187 |
2.09 |
| 2026-04-02 00:00 |
19:45:30.51 |
-00:38:31.1 |
HIP 97233 |
4.23 |
| 2026-04-02 12:00 |
19:45:40.63 |
-00:36:52.4 |
HIP 97233 |
4.92 |
| 2026-04-03 00:00 |
19:45:50.64 |
-00:35:13.8 |
HIP 97233 |
6.97 |
| 2026-04-03 12:00 |
19:46:00.51 |
-00:33:35.2 |
HIP 97233 |
9.51 |
| 2026-04-04 00:00 |
19:46:10.27 |
-00:31:56.5 |
HIP 97233 |
12.23 |
| 2026-04-04 12:00 |
19:46:19.90 |
-00:30:17.9 |
HIP 97233 |
15.01 |
| 2026-04-05 00:00 |
19:46:29.40 |
-00:28:39.3 |
HIP 97233 |
17.82 |
| 2026-04-05 12:00 |
19:46:38.78 |
-00:27:00.8 |
HIP 97233 |
20.62 |
| 2026-04-06 00:00 |
19:46:48.03 |
-00:25:22.2 |
HIP 97233 |
23.42 |
| 2026-04-06 12:00 |
19:46:57.16 |
-00:23:43.8 |
HIP 97403 |
23.91 |
| 2026-04-07 00:00 |
19:47:06.15 |
-00:22:05.3 |
HIP 97403 |
21.32 |
| 2026-04-07 12:00 |
19:47:15.02 |
-00:20:26.9 |
HIP 97403 |
18.80 |
| 2026-04-08 00:00 |
19:47:23.77 |
-00:18:48.6 |
HIP 97403 |
16.37 |
| 2026-04-08 12:00 |
19:47:32.38 |
-00:17:10.3 |
HIP 97403 |
14.07 |
| 2026-04-09 00:00 |
19:47:40.86 |
-00:15:32.1 |
HIP 97403 |
11.94 |
| 2026-04-09 12:00 |
19:47:49.22 |
-00:13:54.0 |
HIP 97403 |
10.08 |
| 2026-04-10 00:00 |
19:47:57.44 |
-00:12:16.0 |
HIP 97403 |
8.64 |
| 2026-04-10 12:00 |
19:48:05.53 |
-00:10:38.1 |
HIP 97403 |
7.83 |
| 2026-04-11 00:00 |
19:48:13.49 |
-00:09:00.3 |
HIP 97403 |
7.81 |
| 2026-04-11 12:00 |
19:48:21.32 |
-00:07:22.6 |
HIP 97403 |
8.58 |
| 2026-04-12 00:00 |
19:48:29.02 |
-00:05:45.0 |
HIP 97403 |
9.92 |
| 2026-04-12 12:00 |
19:48:36.58 |
-00:04:07.5 |
HIP 97403 |
11.62 |
| 2026-04-13 00:00 |
19:48:44.01 |
-00:02:30.2 |
HIP 97403 |
13.54 |
| 2026-04-13 12:00 |
19:48:51.31 |
-00:00:53.0 |
HIP 97403 |
15.58 |
| 2026-04-14 00:00 |
19:48:58.47 |
+00:00:44.0 |
HIP 97585 |
17.00 |
| 2026-04-14 12:00 |
19:49:05.49 |
+00:02:20.9 |
HIP 97585 |
15.17 |
| 2026-04-15 00:00 |
19:49:12.38 |
+00:03:57.6 |
HIP 97585 |
13.55 |
| 2026-04-15 12:00 |
19:49:19.14 |
+00:05:34.2 |
HIP 97585 |
12.21 |
| 2026-04-16 00:00 |
19:49:25.76 |
+00:07:10.5 |
HIP 97585 |
11.22 |