C/2020 W5 (Lemmon)
メタデータ
| 項目 |
値 |
| Designation |
C/2020 W5 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-11-30T01:54:40.083840Z |
| Orbit solution date (soln_date, UTC) |
2025-01-10T09:12:15Z |
| Obs used |
55 |
| NEO |
- |
| M1 |
14.200 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-11-20T05:24:13.046400Z |
| Discovery magnitude (MPC) |
21.61 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) |
2020-11-30.0000000 |
| e |
1.00164978 |
| q (au) |
3.364485 |
| a (au) |
-2039.359232 |
| i (deg) |
88.594700 |
| Ω (om, deg) |
75.516670 |
| ω (w, deg) |
24.475527 |
| M (ma, deg) |
-0.000001 |
等級
散乱 + 全体線形
$$
M_a = (16.215 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.215 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.960 |
| k |
0.800 |
| 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) |
| 2026-02-03 00:00 |
17:20:37.66 |
+09:33:21.6 |
HIP 84824 |
8.55 |
| 2026-02-03 12:00 |
17:20:42.40 |
+09:33:48.9 |
HIP 84824 |
9.74 |
| 2026-02-04 00:00 |
17:20:47.08 |
+09:34:16.7 |
HIP 84824 |
10.94 |
| 2026-02-04 12:00 |
17:20:51.71 |
+09:34:44.9 |
HIP 84824 |
12.14 |
| 2026-02-05 00:00 |
17:20:56.29 |
+09:35:13.4 |
HIP 84824 |
13.33 |
| 2026-02-05 12:00 |
17:21:00.81 |
+09:35:42.4 |
HIP 84824 |
14.53 |
| 2026-02-06 00:00 |
17:21:05.27 |
+09:36:11.7 |
HIP 84955 |
13.70 |
| 2026-02-06 12:00 |
17:21:09.67 |
+09:36:41.4 |
HIP 84955 |
12.54 |
| 2026-02-07 00:00 |
17:21:14.02 |
+09:37:11.5 |
HIP 84955 |
11.38 |
| 2026-02-07 12:00 |
17:21:18.30 |
+09:37:42.0 |
HIP 84955 |
10.23 |
| 2026-02-08 00:00 |
17:21:22.53 |
+09:38:12.9 |
HIP 84955 |
9.10 |
| 2026-02-08 12:00 |
17:21:26.71 |
+09:38:44.1 |
HIP 84955 |
7.99 |
| 2026-02-09 00:00 |
17:21:30.82 |
+09:39:15.7 |
HIP 84955 |
6.90 |
| 2026-02-09 12:00 |
17:21:34.87 |
+09:39:47.7 |
HIP 84955 |
5.82 |
| 2026-02-10 00:00 |
17:21:38.87 |
+09:40:20.0 |
HIP 84955 |
4.78 |
| 2026-02-10 12:00 |
17:21:42.80 |
+09:40:52.7 |
HIP 84955 |
3.79 |
| 2026-02-11 00:00 |
17:21:46.67 |
+09:41:25.7 |
HIP 84955 |
2.89 |
| 2026-02-11 12:00 |
17:21:50.48 |
+09:41:59.2 |
HIP 84955 |
2.17 |
| 2026-02-12 00:00 |
17:21:54.24 |
+09:42:32.9 |
HIP 84955 |
1.85 |
| 2026-02-12 12:00 |
17:21:57.92 |
+09:43:07.0 |
HIP 84955 |
2.10 |
| 2026-02-13 00:00 |
17:22:01.55 |
+09:43:41.5 |
HIP 84955 |
2.76 |
| 2026-02-13 12:00 |
17:22:05.12 |
+09:44:16.2 |
HIP 84955 |
3.60 |
| 2026-02-14 00:00 |
17:22:08.62 |
+09:44:51.4 |
HIP 84955 |
4.51 |
| 2026-02-14 12:00 |
17:22:12.06 |
+09:45:26.8 |
HIP 84955 |
5.46 |
| 2026-02-15 00:00 |
17:22:15.44 |
+09:46:02.6 |
HIP 84955 |
6.42 |
| 2026-02-15 12:00 |
17:22:18.75 |
+09:46:38.7 |
HIP 84955 |
7.39 |
| 2026-02-16 00:00 |
17:22:22.00 |
+09:47:15.1 |
HIP 84955 |
8.35 |
| 2026-02-16 12:00 |
17:22:25.19 |
+09:47:51.8 |
HIP 84955 |
9.31 |
| 2026-02-17 00:00 |
17:22:28.31 |
+09:48:28.8 |
HIP 84955 |
10.26 |
| 2026-02-17 12:00 |
17:22:31.36 |
+09:49:06.2 |
HIP 84955 |
11.21 |
| 2026-02-18 00:00 |
17:22:34.35 |
+09:49:43.8 |
HIP 84955 |
12.15 |
| 2026-02-18 12:00 |
17:22:37.28 |
+09:50:21.8 |
HIP 84955 |
13.08 |
| 2026-02-19 00:00 |
17:22:40.14 |
+09:51:00.0 |
HIP 84955 |
14.01 |
| 2026-02-19 12:00 |
17:22:42.93 |
+09:51:38.5 |
HIP 84955 |
14.92 |
| 2026-02-20 00:00 |
17:22:45.66 |
+09:52:17.3 |
HIP 84955 |
15.83 |
| 2026-02-20 12:00 |
17:22:48.32 |
+09:52:56.4 |
HIP 84955 |
16.73 |
| 2026-02-21 00:00 |
17:22:50.91 |
+09:53:35.8 |
HIP 84955 |
17.62 |
| 2026-02-21 12:00 |
17:22:53.44 |
+09:54:15.4 |
HIP 84955 |
18.50 |
| 2026-02-22 00:00 |
17:22:55.90 |
+09:54:55.3 |
HIP 85006 |
18.23 |
| 2026-02-22 12:00 |
17:22:58.29 |
+09:55:35.4 |
HIP 85006 |
17.85 |
| 2026-02-23 00:00 |
17:23:00.61 |
+09:56:15.9 |
HIP 85006 |
17.50 |
| 2026-02-23 12:00 |
17:23:02.87 |
+09:56:56.5 |
HIP 85006 |
17.18 |
| 2026-02-24 00:00 |
17:23:05.06 |
+09:57:37.4 |
HIP 85006 |
16.88 |