メタデータ
| 項目 |
値 |
| Designation |
P/2015 B4 (Lemmon-PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-02-17T15:37:40.232640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:05Z |
| Obs used |
77 |
| NEO |
- |
| M1 |
15.200 |
| 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) |
2015-11-20.0000000 |
| e |
0.56891192 |
| q (au) |
3.755337 |
| a (au) |
8.711300 |
| i (deg) |
1.742618 |
| Ω (om, deg) |
266.651081 |
| ω (w, deg) |
227.778528 |
| M (ma, deg) |
10.555113 |
等級
散乱 + 全体線形
$$
M_a = (15.526 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.526 |
| n |
2.000 |
| gf |
0.947 |
| gb |
-0.830 |
| k |
0.993 |
| 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) |
| 2026-03-26 00:00 |
20:50:18.80 |
-16:33:18.5 |
HIP 102922 |
14.07 |
| 2026-03-26 12:00 |
20:50:25.43 |
-16:32:49.2 |
HIP 102922 |
12.51 |
| 2026-03-27 00:00 |
20:50:32.01 |
-16:32:20.1 |
HIP 102922 |
11.01 |
| 2026-03-27 12:00 |
20:50:38.53 |
-16:31:51.2 |
HIP 102922 |
9.56 |
| 2026-03-28 00:00 |
20:50:44.99 |
-16:31:22.5 |
HIP 102922 |
8.19 |
| 2026-03-28 12:00 |
20:50:51.40 |
-16:30:54.0 |
HIP 102922 |
6.94 |
| 2026-03-29 00:00 |
20:50:57.75 |
-16:30:25.7 |
HIP 102922 |
5.87 |
| 2026-03-29 12:00 |
20:51:04.04 |
-16:29:57.6 |
HIP 102922 |
5.10 |
| 2026-03-30 00:00 |
20:51:10.28 |
-16:29:29.7 |
HIP 102922 |
4.74 |
| 2026-03-30 12:00 |
20:51:16.45 |
-16:29:02.0 |
HIP 102922 |
4.88 |
| 2026-03-31 00:00 |
20:51:22.57 |
-16:28:34.5 |
HIP 102922 |
5.47 |
| 2026-03-31 12:00 |
20:51:28.63 |
-16:28:07.2 |
HIP 102922 |
6.37 |
| 2026-04-01 00:00 |
20:51:34.63 |
-16:27:40.1 |
HIP 102922 |
7.46 |
| 2026-04-01 12:00 |
20:51:40.57 |
-16:27:13.3 |
HIP 102922 |
8.67 |
| 2026-04-02 00:00 |
20:51:46.46 |
-16:26:46.7 |
HIP 102922 |
9.94 |
| 2026-04-02 12:00 |
20:51:52.28 |
-16:26:20.2 |
HIP 102922 |
11.25 |
| 2026-04-03 00:00 |
20:51:58.04 |
-16:25:54.0 |
HIP 102922 |
12.58 |
| 2026-04-03 12:00 |
20:52:03.75 |
-16:25:28.0 |
HIP 102922 |
13.92 |
| 2026-04-04 00:00 |
20:52:09.39 |
-16:25:02.3 |
HIP 102922 |
15.26 |
| 2026-04-04 12:00 |
20:52:14.97 |
-16:24:36.7 |
HIP 102922 |
16.60 |
| 2026-04-05 00:00 |
20:52:20.49 |
-16:24:11.4 |
HIP 103059 |
15.90 |
| 2026-04-05 12:00 |
20:52:25.95 |
-16:23:46.3 |
HIP 103059 |
14.98 |
| 2026-04-06 00:00 |
20:52:31.34 |
-16:23:21.5 |
HIP 103059 |
14.15 |
| 2026-04-06 12:00 |
20:52:36.67 |
-16:22:56.8 |
HIP 103059 |
13.40 |
| 2026-04-07 00:00 |
20:52:41.95 |
-16:22:32.4 |
HIP 103059 |
12.76 |
| 2026-04-07 12:00 |
20:52:47.15 |
-16:22:08.3 |
HIP 103059 |
12.24 |
| 2026-04-08 00:00 |
20:52:52.30 |
-16:21:44.3 |
HIP 103059 |
11.85 |
| 2026-04-08 12:00 |
20:52:57.38 |
-16:21:20.6 |
HIP 103059 |
11.58 |
| 2026-04-09 00:00 |
20:53:02.40 |
-16:20:57.2 |
HIP 103059 |
11.46 |
| 2026-04-09 12:00 |
20:53:07.35 |
-16:20:34.0 |
HIP 103059 |
11.47 |
| 2026-04-10 00:00 |
20:53:12.24 |
-16:20:11.0 |
HIP 103059 |
11.62 |
| 2026-04-10 12:00 |
20:53:17.06 |
-16:19:48.2 |
HIP 103059 |
11.88 |
| 2026-04-11 00:00 |
20:53:21.82 |
-16:19:25.8 |
HIP 103059 |
12.26 |
| 2026-04-11 12:00 |
20:53:26.52 |
-16:19:03.5 |
HIP 103059 |
12.73 |
| 2026-04-12 00:00 |
20:53:31.15 |
-16:18:41.5 |
HIP 103059 |
13.28 |
| 2026-04-12 12:00 |
20:53:35.71 |
-16:18:19.8 |
HIP 103059 |
13.90 |
| 2026-04-13 00:00 |
20:53:40.20 |
-16:17:58.3 |
HIP 103059 |
14.57 |
| 2026-04-13 12:00 |
20:53:44.63 |
-16:17:37.1 |
HIP 103059 |
15.29 |
| 2026-04-14 00:00 |
20:53:48.99 |
-16:17:16.1 |
HIP 103059 |
16.04 |
| 2026-04-14 12:00 |
20:53:53.29 |
-16:16:55.4 |
HIP 103059 |
16.81 |
| 2026-04-15 00:00 |
20:53:57.52 |
-16:16:34.9 |
HIP 103059 |
17.61 |
| 2026-04-15 12:00 |
20:54:01.67 |
-16:16:14.7 |
HIP 103059 |
18.42 |
| 2026-04-16 00:00 |
20:54:05.77 |
-16:15:54.8 |
HIP 103059 |
19.24 |