メタデータ
| 項目 |
値 |
| Designation |
396P/Leonard |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-08-29T03:15:14.060160Z |
| Orbit solution date (soln_date, UTC) |
2023-04-24T23:29:36Z |
| Obs used |
115 |
| NEO |
- |
| M1 |
15.700 |
| 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) |
2018-05-09.0000000 |
| e |
0.41780395 |
| q (au) |
3.983116 |
| a (au) |
6.841537 |
| i (deg) |
5.434040 |
| Ω (om, deg) |
136.663398 |
| ω (w, deg) |
8.678978 |
| M (ma, deg) |
333.720604 |
等級
散乱 + 全体線形
$$
M_a = (9.411 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.411 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.855 |
| k |
0.998 |
| 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) |
| 2026-07-29 00:00 |
20:35:25.20 |
-17:33:30.2 |
HIP 101596 |
13.79 |
| 2026-07-29 12:00 |
20:35:14.69 |
-17:34:14.2 |
HIP 101596 |
13.25 |
| 2026-07-30 00:00 |
20:35:04.18 |
-17:34:58.2 |
HIP 101596 |
13.22 |
| 2026-07-30 12:00 |
20:34:53.67 |
-17:35:42.1 |
HIP 101596 |
13.70 |
| 2026-07-31 00:00 |
20:34:43.16 |
-17:36:26.1 |
HIP 101596 |
14.63 |
| 2026-07-31 12:00 |
20:34:32.65 |
-17:37:10.0 |
HIP 101596 |
15.94 |
| 2026-08-01 00:00 |
20:34:22.14 |
-17:37:53.9 |
HIP 101596 |
17.54 |
| 2026-08-01 12:00 |
20:34:11.64 |
-17:38:37.8 |
HIP 101596 |
19.36 |
| 2026-08-02 00:00 |
20:34:01.15 |
-17:39:21.6 |
HIP 101596 |
21.34 |
| 2026-08-02 12:00 |
20:33:50.67 |
-17:40:05.4 |
HIP 101596 |
23.44 |
| 2026-08-03 00:00 |
20:33:40.19 |
-17:40:49.2 |
HIP 101596 |
25.63 |
| 2026-08-03 12:00 |
20:33:29.72 |
-17:41:32.9 |
HIP 101596 |
27.89 |
| 2026-08-04 00:00 |
20:33:19.26 |
-17:42:16.6 |
HIP 101596 |
30.20 |
| 2026-08-04 12:00 |
20:33:08.82 |
-17:43:00.3 |
HIP 101596 |
32.55 |
| 2026-08-05 00:00 |
20:32:58.39 |
-17:43:43.8 |
HIP 101249 |
30.78 |
| 2026-08-05 12:00 |
20:32:47.97 |
-17:44:27.3 |
HIP 101249 |
28.51 |
| 2026-08-06 00:00 |
20:32:37.58 |
-17:45:10.8 |
HIP 101249 |
26.30 |
| 2026-08-06 12:00 |
20:32:27.19 |
-17:45:54.2 |
HIP 101249 |
24.16 |
| 2026-08-07 00:00 |
20:32:16.83 |
-17:46:37.5 |
HIP 101249 |
22.12 |
| 2026-08-07 12:00 |
20:32:06.49 |
-17:47:20.7 |
HIP 101249 |
20.21 |
| 2026-08-08 00:00 |
20:31:56.17 |
-17:48:03.8 |
HIP 101249 |
18.45 |
| 2026-08-08 12:00 |
20:31:45.87 |
-17:48:46.9 |
HIP 101249 |
16.91 |
| 2026-08-09 00:00 |
20:31:35.59 |
-17:49:29.8 |
HIP 101249 |
15.64 |
| 2026-08-09 12:00 |
20:31:25.34 |
-17:50:12.7 |
HIP 101249 |
14.70 |
| 2026-08-10 00:00 |
20:31:15.12 |
-17:50:55.4 |
HIP 101249 |
14.16 |
| 2026-08-10 12:00 |
20:31:04.93 |
-17:51:38.1 |
HIP 101249 |
14.07 |
| 2026-08-11 00:00 |
20:30:54.76 |
-17:52:20.6 |
HIP 101249 |
14.42 |
| 2026-08-11 12:00 |
20:30:44.62 |
-17:53:03.0 |
HIP 101249 |
15.18 |
| 2026-08-12 00:00 |
20:30:34.52 |
-17:53:45.3 |
HIP 101249 |
16.30 |
| 2026-08-12 12:00 |
20:30:24.45 |
-17:54:27.5 |
HIP 101249 |
17.69 |
| 2026-08-13 00:00 |
20:30:14.42 |
-17:55:09.5 |
HIP 101040 |
17.74 |
| 2026-08-13 12:00 |
20:30:04.42 |
-17:55:51.4 |
HIP 101040 |
15.53 |
| 2026-08-14 00:00 |
20:29:54.46 |
-17:56:33.2 |
HIP 101040 |
13.42 |
| 2026-08-14 12:00 |
20:29:44.53 |
-17:57:14.8 |
HIP 101040 |
11.46 |
| 2026-08-15 00:00 |
20:29:34.65 |
-17:57:56.2 |
HIP 101040 |
9.74 |
| 2026-08-15 12:00 |
20:29:24.81 |
-17:58:37.5 |
HIP 101040 |
8.39 |
| 2026-08-16 00:00 |
20:29:15.01 |
-17:59:18.6 |
HIP 101040 |
7.61 |
| 2026-08-16 12:00 |
20:29:05.25 |
-17:59:59.6 |
HIP 101040 |
7.57 |
| 2026-08-17 00:00 |
20:28:55.54 |
-18:00:40.4 |
HIP 101040 |
8.26 |
| 2026-08-17 12:00 |
20:28:45.87 |
-18:01:21.1 |
HIP 101040 |
9.52 |
| 2026-08-18 00:00 |
20:28:36.26 |
-18:02:01.5 |
HIP 100931 |
10.77 |
| 2026-08-18 12:00 |
20:28:26.69 |
-18:02:41.8 |
HIP 100931 |
8.44 |
| 2026-08-19 00:00 |
20:28:17.16 |
-18:03:21.9 |
HIP 100931 |
6.16 |