P/2015 Q2 (Pimentel)
メタデータ
| 項目 |
値 |
| Designation |
P/2015 Q2 (Pimentel) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-09-10T08:08:29.523840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:13Z |
| Obs used |
60 |
| NEO |
- |
| M1 |
15.300 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-09-11.0000000 |
| e |
0.75436589 |
| q (au) |
1.819120 |
| a (au) |
7.405813 |
| i (deg) |
146.202156 |
| Ω (om, deg) |
228.244773 |
| ω (w, deg) |
244.407920 |
| M (ma, deg) |
0.032314 |
等級
散乱 + 全体線形
$$
M_a = (15.546 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.546 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-02-03 00:00 |
12:18:21.39 |
+33:34:45.1 |
HIP 60171 |
26.37 |
| 2026-02-03 12:00 |
12:18:13.46 |
+33:36:36.4 |
HIP 59881 |
25.02 |
| 2026-02-04 00:00 |
12:18:05.44 |
+33:38:27.6 |
HIP 59881 |
22.53 |
| 2026-02-04 12:00 |
12:17:57.34 |
+33:40:18.7 |
HIP 59881 |
20.03 |
| 2026-02-05 00:00 |
12:17:49.15 |
+33:42:09.7 |
HIP 59881 |
17.51 |
| 2026-02-05 12:00 |
12:17:40.88 |
+33:44:00.5 |
HIP 59881 |
14.99 |
| 2026-02-06 00:00 |
12:17:32.53 |
+33:45:51.2 |
HIP 59881 |
12.46 |
| 2026-02-06 12:00 |
12:17:24.09 |
+33:47:41.7 |
HIP 59881 |
9.93 |
| 2026-02-07 00:00 |
12:17:15.58 |
+33:49:32.1 |
HIP 59881 |
7.38 |
| 2026-02-07 12:00 |
12:17:06.98 |
+33:51:22.3 |
HIP 59881 |
4.83 |
| 2026-02-08 00:00 |
12:16:58.30 |
+33:53:12.3 |
HIP 59881 |
2.29 |
| 2026-02-08 12:00 |
12:16:49.54 |
+33:55:02.1 |
HIP 59881 |
0.64 |
| 2026-02-09 00:00 |
12:16:40.70 |
+33:56:51.7 |
HIP 59881 |
2.98 |
| 2026-02-09 12:00 |
12:16:31.78 |
+33:58:41.2 |
HIP 59881 |
5.56 |
| 2026-02-10 00:00 |
12:16:22.78 |
+34:00:30.3 |
HIP 59881 |
8.15 |
| 2026-02-10 12:00 |
12:16:13.71 |
+34:02:19.3 |
HIP 59881 |
10.76 |
| 2026-02-11 00:00 |
12:16:04.55 |
+34:04:08.0 |
HIP 59881 |
13.38 |
| 2026-02-11 12:00 |
12:15:55.32 |
+34:05:56.5 |
HIP 59881 |
16.01 |
| 2026-02-12 00:00 |
12:15:46.02 |
+34:07:44.7 |
HIP 59881 |
18.64 |
| 2026-02-12 12:00 |
12:15:36.63 |
+34:09:32.6 |
HIP 59881 |
21.29 |
| 2026-02-13 00:00 |
12:15:27.18 |
+34:11:20.2 |
HIP 59881 |
23.94 |
| 2026-02-13 12:00 |
12:15:17.65 |
+34:13:07.5 |
HIP 59881 |
26.60 |
| 2026-02-14 00:00 |
12:15:08.04 |
+34:14:54.6 |
HIP 59564 |
27.82 |
| 2026-02-14 12:00 |
12:14:58.36 |
+34:16:41.3 |
HIP 59564 |
25.83 |
| 2026-02-15 00:00 |
12:14:48.61 |
+34:18:27.7 |
HIP 59564 |
23.96 |
| 2026-02-15 12:00 |
12:14:38.79 |
+34:20:13.7 |
HIP 59564 |
22.23 |
| 2026-02-16 00:00 |
12:14:28.90 |
+34:21:59.5 |
HIP 59564 |
20.70 |
| 2026-02-16 12:00 |
12:14:18.94 |
+34:23:44.8 |
HIP 59564 |
19.42 |
| 2026-02-17 00:00 |
12:14:08.91 |
+34:25:29.8 |
HIP 59564 |
18.43 |
| 2026-02-17 12:00 |
12:13:58.81 |
+34:27:14.4 |
HIP 59564 |
17.78 |
| 2026-02-18 00:00 |
12:13:48.64 |
+34:28:58.6 |
HIP 59564 |
17.53 |
| 2026-02-18 12:00 |
12:13:38.41 |
+34:30:42.4 |
HIP 59564 |
17.68 |
| 2026-02-19 00:00 |
12:13:28.11 |
+34:32:25.8 |
HIP 59564 |
18.24 |
| 2026-02-19 12:00 |
12:13:17.75 |
+34:34:08.8 |
HIP 59564 |
19.16 |
| 2026-02-20 00:00 |
12:13:07.32 |
+34:35:51.4 |
HIP 59564 |
20.40 |
| 2026-02-20 12:00 |
12:12:56.83 |
+34:37:33.5 |
HIP 59564 |
21.91 |
| 2026-02-21 00:00 |
12:12:46.28 |
+34:39:15.2 |
HIP 59564 |
23.64 |
| 2026-02-21 12:00 |
12:12:35.67 |
+34:40:56.4 |
HIP 59564 |
25.55 |
| 2026-02-22 00:00 |
12:12:24.99 |
+34:42:37.1 |
HIP 59564 |
27.59 |
| 2026-02-22 12:00 |
12:12:14.26 |
+34:44:17.4 |
HIP 59564 |
29.75 |
| 2026-02-23 00:00 |
12:12:03.47 |
+34:45:57.1 |
HIP 59440 |
31.10 |
| 2026-02-23 12:00 |
12:11:52.62 |
+34:47:36.4 |
HIP 59440 |
32.35 |
| 2026-02-24 00:00 |
12:11:41.71 |
+34:49:15.2 |
HIP 59440 |
33.78 |