メタデータ
| 項目 |
値 |
| Designation |
P/2017 Y3 (Leonard) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-02-11T06:14:12.742080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:39Z |
| Obs used |
93 |
| NEO |
Yes |
| M1 |
16.500 |
| K1 |
11.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-02-20.0000000 |
| e |
0.87071088 |
| q (au) |
1.275381 |
| a (au) |
9.864564 |
| i (deg) |
27.585652 |
| Ω (om, deg) |
153.873913 |
| ω (w, deg) |
67.528786 |
| M (ma, deg) |
0.278039 |
等級
散乱 + 全体線形
$$
M_a = (15.771 + 4.270\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.771 |
| n |
4.270 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
02:08:52.18 |
-09:16:40.3 |
HIP 10062 |
36.78 |
| 2026-05-12 12:00 |
02:08:59.40 |
-09:16:19.0 |
HIP 10062 |
36.70 |
| 2026-05-13 00:00 |
02:09:06.60 |
-09:15:58.1 |
HIP 10126 |
35.84 |
| 2026-05-13 12:00 |
02:09:13.79 |
-09:15:37.6 |
HIP 10126 |
34.72 |
| 2026-05-14 00:00 |
02:09:20.96 |
-09:15:17.5 |
HIP 10126 |
33.68 |
| 2026-05-14 12:00 |
02:09:28.12 |
-09:14:57.8 |
HIP 10126 |
32.71 |
| 2026-05-15 00:00 |
02:09:35.25 |
-09:14:38.5 |
HIP 10126 |
31.81 |
| 2026-05-15 12:00 |
02:09:42.38 |
-09:14:19.6 |
HIP 10126 |
31.01 |
| 2026-05-16 00:00 |
02:09:49.48 |
-09:14:01.1 |
HIP 10126 |
30.29 |
| 2026-05-16 12:00 |
02:09:56.57 |
-09:13:43.0 |
HIP 10126 |
29.67 |
| 2026-05-17 00:00 |
02:10:03.64 |
-09:13:25.3 |
HIP 10126 |
29.16 |
| 2026-05-17 12:00 |
02:10:10.69 |
-09:13:08.1 |
HIP 10126 |
28.75 |
| 2026-05-18 00:00 |
02:10:17.72 |
-09:12:51.2 |
HIP 10126 |
28.45 |
| 2026-05-18 12:00 |
02:10:24.73 |
-09:12:34.8 |
HIP 10126 |
28.27 |
| 2026-05-19 00:00 |
02:10:31.72 |
-09:12:18.8 |
HIP 10126 |
28.20 |
| 2026-05-19 12:00 |
02:10:38.69 |
-09:12:03.2 |
HIP 10126 |
28.24 |
| 2026-05-20 00:00 |
02:10:45.64 |
-09:11:48.0 |
HIP 10126 |
28.39 |
| 2026-05-20 12:00 |
02:10:52.57 |
-09:11:33.3 |
HIP 10126 |
28.66 |
| 2026-05-21 00:00 |
02:10:59.48 |
-09:11:18.9 |
HIP 10126 |
29.03 |
| 2026-05-21 12:00 |
02:11:06.36 |
-09:11:05.0 |
HIP 10126 |
29.50 |
| 2026-05-22 00:00 |
02:11:13.23 |
-09:10:51.5 |
HIP 10126 |
30.06 |
| 2026-05-22 12:00 |
02:11:20.07 |
-09:10:38.4 |
HIP 10126 |
30.71 |
| 2026-05-23 00:00 |
02:11:26.88 |
-09:10:25.7 |
HIP 10126 |
31.45 |
| 2026-05-23 12:00 |
02:11:33.68 |
-09:10:13.5 |
HIP 10126 |
32.26 |
| 2026-05-24 00:00 |
02:11:40.45 |
-09:10:01.7 |
HIP 10126 |
33.13 |
| 2026-05-24 12:00 |
02:11:47.20 |
-09:09:50.3 |
HIP 10396 |
31.75 |
| 2026-05-25 00:00 |
02:11:53.92 |
-09:09:39.3 |
HIP 10396 |
30.09 |
| 2026-05-25 12:00 |
02:12:00.62 |
-09:09:28.7 |
HIP 10396 |
28.43 |
| 2026-05-26 00:00 |
02:12:07.29 |
-09:09:18.6 |
HIP 10396 |
26.79 |
| 2026-05-26 12:00 |
02:12:13.93 |
-09:09:08.9 |
HIP 10396 |
25.15 |
| 2026-05-27 00:00 |
02:12:20.56 |
-09:08:59.7 |
HIP 10396 |
23.52 |
| 2026-05-27 12:00 |
02:12:27.15 |
-09:08:50.8 |
HIP 10396 |
21.90 |
| 2026-05-28 00:00 |
02:12:33.72 |
-09:08:42.4 |
HIP 10396 |
20.29 |
| 2026-05-28 12:00 |
02:12:40.26 |
-09:08:34.4 |
HIP 10396 |
18.69 |
| 2026-05-29 00:00 |
02:12:46.78 |
-09:08:26.8 |
HIP 10396 |
17.11 |
| 2026-05-29 12:00 |
02:12:53.26 |
-09:08:19.7 |
HIP 10396 |
15.53 |
| 2026-05-30 00:00 |
02:12:59.72 |
-09:08:13.0 |
HIP 10396 |
13.98 |
| 2026-05-30 12:00 |
02:13:06.15 |
-09:08:06.7 |
HIP 10396 |
12.44 |
| 2026-05-31 00:00 |
02:13:12.56 |
-09:08:00.9 |
HIP 10396 |
10.93 |
| 2026-05-31 12:00 |
02:13:18.93 |
-09:07:55.4 |
HIP 10396 |
9.45 |
| 2026-06-01 00:00 |
02:13:25.28 |
-09:07:50.5 |
HIP 10396 |
8.03 |
| 2026-06-01 12:00 |
02:13:31.59 |
-09:07:45.9 |
HIP 10396 |
6.67 |
| 2026-06-02 00:00 |
02:13:37.88 |
-09:07:41.8 |
HIP 10396 |
5.43 |