メタデータ
| 項目 |
値 |
| Designation |
C/2020 K3 (Leonard) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-05-30T02:55:42.355200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:34:07Z |
| Obs used |
212 |
| NEO |
- |
| M1 |
14.900 |
| K1 |
13.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-05-22T10:46:25.824000Z |
| Discovery magnitude (MPC) |
18.00 G |
| Discovery observatory (MPC) |
703 · University of Arizona Catalina Sky Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-06-08.0000000 |
| e |
0.99242187 |
| q (au) |
1.593446 |
| a (au) |
210.269034 |
| i (deg) |
128.715444 |
| Ω (om, deg) |
27.927767 |
| ω (w, deg) |
62.697775 |
| M (ma, deg) |
0.002870 |
等級
散乱 + 全体線形
$$
M_a = (15.248 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.248 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.656 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2019-10-25 |
2020-05-29 |
+3.6819 |
-1.535 |
| 2020-05-31 |
2020-09-12 |
+12.6466 |
-2.959 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
11:48:19.42 |
-21:39:03.4 |
HIP 57468 |
23.52 |
| 2026-07-29 12:00 |
11:48:22.94 |
-21:39:01.4 |
HIP 57468 |
24.24 |
| 2026-07-30 00:00 |
11:48:26.50 |
-21:38:59.8 |
HIP 57468 |
24.97 |
| 2026-07-30 12:00 |
11:48:30.10 |
-21:38:58.6 |
HIP 57468 |
25.73 |
| 2026-07-31 00:00 |
11:48:33.73 |
-21:38:57.9 |
HIP 57468 |
26.50 |
| 2026-07-31 12:00 |
11:48:37.41 |
-21:38:57.6 |
HIP 57468 |
27.28 |
| 2026-08-01 00:00 |
11:48:41.12 |
-21:38:57.7 |
HIP 57468 |
28.08 |
| 2026-08-01 12:00 |
11:48:44.86 |
-21:38:58.3 |
HIP 57468 |
28.90 |
| 2026-08-02 00:00 |
11:48:48.65 |
-21:38:59.3 |
HIP 57583 |
29.64 |
| 2026-08-02 12:00 |
11:48:52.47 |
-21:39:00.7 |
HIP 57583 |
29.87 |
| 2026-08-03 00:00 |
11:48:56.33 |
-21:39:02.6 |
HIP 57583 |
30.11 |
| 2026-08-03 12:00 |
11:49:00.22 |
-21:39:04.9 |
HIP 57583 |
30.37 |
| 2026-08-04 00:00 |
11:49:04.15 |
-21:39:07.7 |
HIP 57583 |
30.66 |
| 2026-08-04 12:00 |
11:49:08.11 |
-21:39:10.8 |
HIP 57583 |
30.96 |
| 2026-08-05 00:00 |
11:49:12.11 |
-21:39:14.4 |
HIP 57717 |
31.15 |
| 2026-08-05 12:00 |
11:49:16.15 |
-21:39:18.5 |
HIP 57717 |
30.81 |
| 2026-08-06 00:00 |
11:49:20.21 |
-21:39:23.0 |
HIP 57717 |
30.50 |
| 2026-08-06 12:00 |
11:49:24.32 |
-21:39:27.9 |
HIP 57827 |
29.89 |
| 2026-08-07 00:00 |
11:49:28.45 |
-21:39:33.2 |
HIP 57827 |
28.94 |
| 2026-08-07 12:00 |
11:49:32.62 |
-21:39:39.0 |
HIP 57827 |
27.98 |
| 2026-08-08 00:00 |
11:49:36.82 |
-21:39:45.2 |
HIP 57827 |
27.01 |
| 2026-08-08 12:00 |
11:49:41.06 |
-21:39:51.8 |
HIP 57827 |
26.03 |
| 2026-08-09 00:00 |
11:49:45.33 |
-21:39:58.9 |
HIP 57827 |
25.05 |
| 2026-08-09 12:00 |
11:49:49.62 |
-21:40:06.3 |
HIP 57827 |
24.06 |
| 2026-08-10 00:00 |
11:49:53.96 |
-21:40:14.3 |
HIP 57827 |
23.07 |
| 2026-08-10 12:00 |
11:49:58.32 |
-21:40:22.6 |
HIP 57827 |
22.08 |
| 2026-08-11 00:00 |
11:50:02.71 |
-21:40:31.4 |
HIP 57827 |
21.08 |
| 2026-08-11 12:00 |
11:50:07.14 |
-21:40:40.6 |
HIP 57827 |
20.07 |
| 2026-08-12 00:00 |
11:50:11.59 |
-21:40:50.2 |
HIP 57827 |
19.07 |
| 2026-08-12 12:00 |
11:50:16.08 |
-21:41:00.2 |
HIP 57827 |
18.06 |
| 2026-08-13 00:00 |
11:50:20.59 |
-21:41:10.7 |
HIP 57827 |
17.06 |
| 2026-08-13 12:00 |
11:50:25.13 |
-21:41:21.6 |
HIP 57827 |
16.06 |
| 2026-08-14 00:00 |
11:50:29.70 |
-21:41:32.9 |
HIP 57827 |
15.06 |
| 2026-08-14 12:00 |
11:50:34.31 |
-21:41:44.7 |
HIP 57827 |
14.07 |
| 2026-08-15 00:00 |
11:50:38.93 |
-21:41:56.8 |
HIP 57827 |
13.09 |
| 2026-08-15 12:00 |
11:50:43.59 |
-21:42:09.4 |
HIP 57827 |
12.13 |
| 2026-08-16 00:00 |
11:50:48.27 |
-21:42:22.4 |
HIP 57827 |
11.18 |
| 2026-08-16 12:00 |
11:50:52.98 |
-21:42:35.8 |
HIP 57827 |
10.27 |
| 2026-08-17 00:00 |
11:50:57.72 |
-21:42:49.6 |
HIP 57827 |
9.41 |
| 2026-08-17 12:00 |
11:51:02.48 |
-21:43:03.8 |
HIP 57827 |
8.60 |
| 2026-08-18 00:00 |
11:51:07.27 |
-21:43:18.5 |
HIP 57827 |
7.87 |
| 2026-08-18 12:00 |
11:51:12.08 |
-21:43:33.5 |
HIP 57827 |
7.25 |
| 2026-08-19 00:00 |
11:51:16.92 |
-21:43:49.0 |
HIP 57827 |
6.77 |