メタデータ
| 項目 |
値 |
| Designation |
P/2021 L2 (Leonard) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-07-24T13:05:37.386240Z |
| Orbit solution date (soln_date, UTC) |
2021-11-20T19:13:06Z |
| Obs used |
131 |
| NEO |
- |
| M1 |
16.200 |
| K1 |
11.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2021-06-08T09:29:49.689600Z |
| Discovery magnitude (MPC) |
20.31 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) |
2021-07-26.0000000 |
| e |
0.52175163 |
| q (au) |
1.938550 |
| a (au) |
4.053438 |
| i (deg) |
21.068982 |
| Ω (om, deg) |
266.675736 |
| ω (w, deg) |
51.538655 |
| M (ma, deg) |
0.175655 |
等級
散乱 + 全体線形
$$
M_a = (18.490 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.490 |
| n |
2.000 |
| gf |
0.848 |
| gb |
-1.000 |
| k |
0.965 |
| δ90 |
1.000 |
| 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) |
| 2026-05-12 00:00 |
09:00:16.68 |
-02:42:59.5 |
HIP 44179 |
11.16 |
| 2026-05-12 12:00 |
09:00:23.84 |
-02:42:13.1 |
HIP 44179 |
11.39 |
| 2026-05-13 00:00 |
09:00:31.14 |
-02:41:27.6 |
HIP 44179 |
11.97 |
| 2026-05-13 12:00 |
09:00:38.58 |
-02:40:43.1 |
HIP 44293 |
11.47 |
| 2026-05-14 00:00 |
09:00:46.17 |
-02:39:59.4 |
HIP 44293 |
9.55 |
| 2026-05-14 12:00 |
09:00:53.89 |
-02:39:16.6 |
HIP 44293 |
7.66 |
| 2026-05-15 00:00 |
09:01:01.75 |
-02:38:34.7 |
HIP 44293 |
5.89 |
| 2026-05-15 12:00 |
09:01:09.74 |
-02:37:53.7 |
HIP 44293 |
4.40 |
| 2026-05-16 00:00 |
09:01:17.88 |
-02:37:13.7 |
HIP 44293 |
3.62 |
| 2026-05-16 12:00 |
09:01:26.15 |
-02:36:34.5 |
HIP 44293 |
4.03 |
| 2026-05-17 00:00 |
09:01:34.55 |
-02:35:56.3 |
HIP 44293 |
5.41 |
| 2026-05-17 12:00 |
09:01:43.09 |
-02:35:18.9 |
HIP 44293 |
7.23 |
| 2026-05-18 00:00 |
09:01:51.77 |
-02:34:42.5 |
HIP 44293 |
9.27 |
| 2026-05-18 12:00 |
09:02:00.57 |
-02:34:07.0 |
HIP 44293 |
11.42 |
| 2026-05-19 00:00 |
09:02:09.51 |
-02:33:32.4 |
HIP 44379 |
12.16 |
| 2026-05-19 12:00 |
09:02:18.58 |
-02:32:58.7 |
HIP 44379 |
11.12 |
| 2026-05-20 00:00 |
09:02:27.78 |
-02:32:26.0 |
HIP 44379 |
10.52 |
| 2026-05-20 12:00 |
09:02:37.11 |
-02:31:54.2 |
HIP 44379 |
10.47 |
| 2026-05-21 00:00 |
09:02:46.57 |
-02:31:23.3 |
HIP 44379 |
10.97 |
| 2026-05-21 12:00 |
09:02:56.15 |
-02:30:53.3 |
HIP 44379 |
11.99 |
| 2026-05-22 00:00 |
09:03:05.87 |
-02:30:24.3 |
HIP 44470 |
9.73 |
| 2026-05-22 12:00 |
09:03:15.70 |
-02:29:56.2 |
HIP 44470 |
7.57 |
| 2026-05-23 00:00 |
09:03:25.67 |
-02:29:29.0 |
HIP 44470 |
5.70 |
| 2026-05-23 12:00 |
09:03:35.76 |
-02:29:02.8 |
HIP 44470 |
4.53 |
| 2026-05-24 00:00 |
09:03:45.97 |
-02:28:37.5 |
HIP 44470 |
4.69 |
| 2026-05-24 12:00 |
09:03:56.30 |
-02:28:13.1 |
HIP 44470 |
6.10 |
| 2026-05-25 00:00 |
09:04:06.75 |
-02:27:49.6 |
HIP 44470 |
8.16 |
| 2026-05-25 12:00 |
09:04:17.33 |
-02:27:27.1 |
HIP 44470 |
10.52 |
| 2026-05-26 00:00 |
09:04:28.03 |
-02:27:05.5 |
HIP 44470 |
13.03 |
| 2026-05-26 12:00 |
09:04:38.84 |
-02:26:44.8 |
HIP 44564 |
14.43 |
| 2026-05-27 00:00 |
09:04:49.77 |
-02:26:25.0 |
HIP 44564 |
13.94 |
| 2026-05-27 12:00 |
09:05:00.82 |
-02:26:06.2 |
HIP 44564 |
14.00 |
| 2026-05-28 00:00 |
09:05:11.99 |
-02:25:48.3 |
HIP 44564 |
14.62 |
| 2026-05-28 12:00 |
09:05:23.27 |
-02:25:31.3 |
HIP 44564 |
15.76 |
| 2026-05-29 00:00 |
09:05:34.67 |
-02:25:15.3 |
HIP 44564 |
17.32 |
| 2026-05-29 12:00 |
09:05:46.18 |
-02:25:00.2 |
HIP 44696 |
15.47 |
| 2026-05-30 00:00 |
09:05:57.80 |
-02:24:46.0 |
HIP 44696 |
13.77 |
| 2026-05-30 12:00 |
09:06:09.54 |
-02:24:32.8 |
HIP 44696 |
12.51 |
| 2026-05-31 00:00 |
09:06:21.39 |
-02:24:20.4 |
HIP 44696 |
11.83 |
| 2026-05-31 12:00 |
09:06:33.35 |
-02:24:09.0 |
HIP 44696 |
11.87 |
| 2026-06-01 00:00 |
09:06:45.42 |
-02:23:58.6 |
HIP 44696 |
12.63 |
| 2026-06-01 12:00 |
09:06:57.60 |
-02:23:49.0 |
HIP 44696 |
14.01 |
| 2026-06-02 00:00 |
09:07:09.89 |
-02:23:40.4 |
HIP 44820 |
13.80 |