メタデータ
| 項目 |
値 |
| Designation |
449P/Leonard |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-11-23T14:34:44.742720Z |
| Orbit solution date (soln_date, UTC) |
2024-02-25T22:13:10Z |
| Obs used |
294 |
| NEO |
- |
| M1 |
8.600 |
| K1 |
37.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
1987-03-23T09:59:28.320000Z |
| Discovery magnitude (MPC) |
17.50 T |
| Discovery observatory (MPC) |
260 · Siding Spring Observatory-DSS |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-10-20.0000000 |
| e |
0.47899106 |
| q (au) |
1.874781 |
| a (au) |
3.598367 |
| i (deg) |
15.459226 |
| Ω (om, deg) |
242.570978 |
| ω (w, deg) |
176.651702 |
| M (ma, deg) |
355.002928 |
等級
散乱 + 全体線形
$$
M_a = (14.886 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.886 |
| n |
6.000 |
| gf |
0.994 |
| gb |
-0.800 |
| k |
0.993 |
| 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 |
19:50:07.89 |
-02:15:56.5 |
HIP 97687 |
19.66 |
| 2026-07-29 12:00 |
19:49:43.90 |
-02:16:29.1 |
HIP 97687 |
24.48 |
| 2026-07-30 00:00 |
19:49:19.95 |
-02:17:03.4 |
HIP 97466 |
29.31 |
| 2026-07-30 12:00 |
19:48:56.06 |
-02:17:39.2 |
HIP 97466 |
28.39 |
| 2026-07-31 00:00 |
19:48:32.21 |
-02:18:16.6 |
HIP 97333 |
23.91 |
| 2026-07-31 12:00 |
19:48:08.43 |
-02:18:55.6 |
HIP 97333 |
18.09 |
| 2026-08-01 00:00 |
19:47:44.71 |
-02:19:36.1 |
HIP 97333 |
12.42 |
| 2026-08-01 12:00 |
19:47:21.05 |
-02:20:18.1 |
HIP 97333 |
7.30 |
| 2026-08-02 00:00 |
19:46:57.47 |
-02:21:01.7 |
HIP 97333 |
4.81 |
| 2026-08-02 12:00 |
19:46:33.96 |
-02:21:46.8 |
HIP 97333 |
7.97 |
| 2026-08-03 00:00 |
19:46:10.53 |
-02:22:33.4 |
HIP 97333 |
13.19 |
| 2026-08-03 12:00 |
19:45:47.20 |
-02:23:21.5 |
HIP 97333 |
18.80 |
| 2026-08-04 00:00 |
19:45:23.95 |
-02:24:11.1 |
HIP 97333 |
24.53 |
| 2026-08-04 12:00 |
19:45:00.80 |
-02:25:02.1 |
HIP 97107 |
28.34 |
| 2026-08-05 00:00 |
19:44:37.74 |
-02:25:54.6 |
HIP 97107 |
26.82 |
| 2026-08-05 12:00 |
19:44:14.80 |
-02:26:48.5 |
HIP 96965 |
25.97 |
| 2026-08-06 00:00 |
19:43:51.96 |
-02:27:43.9 |
HIP 96965 |
20.29 |
| 2026-08-06 12:00 |
19:43:29.24 |
-02:28:40.6 |
HIP 96965 |
14.71 |
| 2026-08-07 00:00 |
19:43:06.64 |
-02:29:38.8 |
HIP 96965 |
9.33 |
| 2026-08-07 12:00 |
19:42:44.16 |
-02:30:38.3 |
HIP 96965 |
4.84 |
| 2026-08-08 00:00 |
19:42:21.81 |
-02:31:39.2 |
HIP 96965 |
4.94 |
| 2026-08-08 12:00 |
19:41:59.59 |
-02:32:41.5 |
HIP 96965 |
9.44 |
| 2026-08-09 00:00 |
19:41:37.52 |
-02:33:45.1 |
HIP 96965 |
14.71 |
| 2026-08-09 12:00 |
19:41:15.58 |
-02:34:50.0 |
HIP 96851 |
16.05 |
| 2026-08-10 00:00 |
19:40:53.80 |
-02:35:56.2 |
HIP 96851 |
17.72 |
| 2026-08-10 12:00 |
19:40:32.16 |
-02:37:03.7 |
HIP 96673 |
19.38 |
| 2026-08-11 00:00 |
19:40:10.69 |
-02:38:12.4 |
HIP 96673 |
14.09 |
| 2026-08-11 12:00 |
19:39:49.38 |
-02:39:22.4 |
HIP 96673 |
9.08 |
| 2026-08-12 00:00 |
19:39:28.23 |
-02:40:33.6 |
HIP 96673 |
5.13 |
| 2026-08-12 12:00 |
19:39:07.26 |
-02:41:46.0 |
HIP 96673 |
5.37 |
| 2026-08-13 00:00 |
19:38:46.46 |
-02:42:59.6 |
HIP 96673 |
9.42 |
| 2026-08-13 12:00 |
19:38:25.84 |
-02:44:14.3 |
HIP 96541 |
12.53 |
| 2026-08-14 00:00 |
19:38:05.41 |
-02:45:30.2 |
HIP 96541 |
8.05 |
| 2026-08-14 12:00 |
19:37:45.16 |
-02:46:47.2 |
HIP 96541 |
5.31 |
| 2026-08-15 00:00 |
19:37:25.11 |
-02:48:05.3 |
HIP 96541 |
6.78 |
| 2026-08-15 12:00 |
19:37:05.26 |
-02:49:24.4 |
HIP 96541 |
10.80 |
| 2026-08-16 00:00 |
19:36:45.60 |
-02:50:44.6 |
HIP 96541 |
15.47 |
| 2026-08-16 12:00 |
19:36:26.15 |
-02:52:05.9 |
HIP 96541 |
20.30 |
| 2026-08-17 00:00 |
19:36:06.91 |
-02:53:28.1 |
HIP 96541 |
25.17 |
| 2026-08-17 12:00 |
19:35:47.89 |
-02:54:51.4 |
HIP 96392 |
27.53 |
| 2026-08-18 00:00 |
19:35:29.08 |
-02:56:15.5 |
HIP 96392 |
29.43 |
| 2026-08-18 12:00 |
19:35:10.49 |
-02:57:40.7 |
HIP 96392 |
31.97 |
| 2026-08-19 00:00 |
19:34:52.12 |
-02:59:06.7 |
HIP 96392 |
34.99 |