メタデータ
| 項目 |
値 |
| Designation |
P/2015 D6 (Lemmon-PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-07-21T02:31:34.800960Z |
| Orbit solution date (soln_date, UTC) |
2024-09-01T19:42:23Z |
| Obs used |
66 |
| NEO |
- |
| M1 |
7.600 |
| K1 |
16.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-08-03.0000000 |
| e |
0.36774122 |
| q (au) |
4.567753 |
| a (au) |
7.224499 |
| i (deg) |
20.225177 |
| Ω (om, deg) |
46.134037 |
| ω (w, deg) |
126.551812 |
| M (ma, deg) |
0.654493 |
等級
散乱 + 全体線形
$$
M_a = (7.288 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.288 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.789 |
| 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) |
| 2026-09-20 00:00 |
01:02:26.62 |
-08:03:20.0 |
HIP 4854 |
1.81 |
| 2026-09-20 12:00 |
01:02:17.27 |
-08:04:14.7 |
HIP 4854 |
3.71 |
| 2026-09-21 00:00 |
01:02:07.88 |
-08:05:09.2 |
HIP 4854 |
6.06 |
| 2026-09-21 12:00 |
01:01:58.44 |
-08:06:03.5 |
HIP 4854 |
8.50 |
| 2026-09-22 00:00 |
01:01:48.97 |
-08:06:57.6 |
HIP 4854 |
10.98 |
| 2026-09-22 12:00 |
01:01:39.45 |
-08:07:51.5 |
HIP 4854 |
13.47 |
| 2026-09-23 00:00 |
01:01:29.90 |
-08:08:45.2 |
HIP 4854 |
15.98 |
| 2026-09-23 12:00 |
01:01:20.31 |
-08:09:38.6 |
HIP 4854 |
18.50 |
| 2026-09-24 00:00 |
01:01:10.69 |
-08:10:31.8 |
HIP 4854 |
21.04 |
| 2026-09-24 12:00 |
01:01:01.03 |
-08:11:24.7 |
HIP 4657 |
19.10 |
| 2026-09-25 00:00 |
01:00:51.34 |
-08:12:17.4 |
HIP 4657 |
16.55 |
| 2026-09-25 12:00 |
01:00:41.62 |
-08:13:09.8 |
HIP 4657 |
14.01 |
| 2026-09-26 00:00 |
01:00:31.86 |
-08:14:02.0 |
HIP 4657 |
11.46 |
| 2026-09-26 12:00 |
01:00:22.08 |
-08:14:53.9 |
HIP 4657 |
8.93 |
| 2026-09-27 00:00 |
01:00:12.26 |
-08:15:45.5 |
HIP 4657 |
6.41 |
| 2026-09-27 12:00 |
01:00:02.42 |
-08:16:36.8 |
HIP 4657 |
3.98 |
| 2026-09-28 00:00 |
00:59:52.55 |
-08:17:27.8 |
HIP 4657 |
1.97 |
| 2026-09-28 12:00 |
00:59:42.65 |
-08:18:18.5 |
HIP 4657 |
2.31 |
| 2026-09-29 00:00 |
00:59:32.73 |
-08:19:08.9 |
HIP 4657 |
4.50 |
| 2026-09-29 12:00 |
00:59:22.79 |
-08:19:58.9 |
HIP 4657 |
6.98 |
| 2026-09-30 00:00 |
00:59:12.82 |
-08:20:48.7 |
HIP 4657 |
9.53 |
| 2026-09-30 12:00 |
00:59:02.83 |
-08:21:38.1 |
HIP 4657 |
12.10 |
| 2026-10-01 00:00 |
00:58:52.83 |
-08:22:27.1 |
HIP 4657 |
14.69 |
| 2026-10-01 12:00 |
00:58:42.80 |
-08:23:15.8 |
HIP 4657 |
17.28 |
| 2026-10-02 00:00 |
00:58:32.75 |
-08:24:04.1 |
HIP 4657 |
19.89 |
| 2026-10-02 12:00 |
00:58:22.69 |
-08:24:52.1 |
HIP 4657 |
22.50 |
| 2026-10-03 00:00 |
00:58:12.61 |
-08:25:39.7 |
HIP 4657 |
25.11 |
| 2026-10-03 12:00 |
00:58:02.52 |
-08:26:26.9 |
HIP 4657 |
27.72 |
| 2026-10-04 00:00 |
00:57:52.41 |
-08:27:13.7 |
HIP 4657 |
30.34 |
| 2026-10-04 12:00 |
00:57:42.30 |
-08:28:00.2 |
HIP 4657 |
32.95 |
| 2026-10-05 00:00 |
00:57:32.17 |
-08:28:46.2 |
HIP 4380 |
34.34 |
| 2026-10-05 12:00 |
00:57:22.03 |
-08:29:31.8 |
HIP 4380 |
33.52 |
| 2026-10-06 00:00 |
00:57:11.88 |
-08:30:17.0 |
HIP 4380 |
32.88 |
| 2026-10-06 12:00 |
00:57:01.73 |
-08:31:01.7 |
HIP 4380 |
32.43 |
| 2026-10-07 00:00 |
00:56:51.57 |
-08:31:46.0 |
HIP 4380 |
32.19 |
| 2026-10-07 12:00 |
00:56:41.41 |
-08:32:29.9 |
HIP 4380 |
32.15 |
| 2026-10-08 00:00 |
00:56:31.24 |
-08:33:13.3 |
HIP 4380 |
32.31 |
| 2026-10-08 12:00 |
00:56:21.07 |
-08:33:56.2 |
HIP 4257 |
32.27 |
| 2026-10-09 00:00 |
00:56:10.90 |
-08:34:38.7 |
HIP 4257 |
29.67 |
| 2026-10-09 12:00 |
00:56:00.73 |
-08:35:20.7 |
HIP 4257 |
27.06 |
| 2026-10-10 00:00 |
00:55:50.56 |
-08:36:02.2 |
HIP 4257 |
24.47 |
| 2026-10-10 12:00 |
00:55:40.40 |
-08:36:43.2 |
HIP 4257 |
21.87 |
| 2026-10-11 00:00 |
00:55:30.24 |
-08:37:23.7 |
HIP 4257 |
19.29 |