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) |
| 2026-05-12 00:00 |
11:43:11.61 |
+36:27:58.1 |
HIP 57098 |
19.69 |
| 2026-05-12 12:00 |
11:43:04.21 |
+36:27:31.7 |
HIP 57098 |
19.31 |
| 2026-05-13 00:00 |
11:42:56.89 |
+36:27:04.5 |
HIP 57098 |
19.06 |
| 2026-05-13 12:00 |
11:42:49.65 |
+36:26:36.7 |
HIP 57098 |
18.96 |
| 2026-05-14 00:00 |
11:42:42.50 |
+36:26:08.1 |
HIP 57098 |
18.99 |
| 2026-05-14 12:00 |
11:42:35.44 |
+36:25:38.9 |
HIP 57098 |
19.16 |
| 2026-05-15 00:00 |
11:42:28.46 |
+36:25:08.9 |
HIP 57098 |
19.45 |
| 2026-05-15 12:00 |
11:42:21.57 |
+36:24:38.3 |
HIP 57098 |
19.87 |
| 2026-05-16 00:00 |
11:42:14.77 |
+36:24:07.0 |
HIP 57098 |
20.39 |
| 2026-05-16 12:00 |
11:42:08.05 |
+36:23:35.1 |
HIP 57098 |
21.01 |
| 2026-05-17 00:00 |
11:42:01.43 |
+36:23:02.5 |
HIP 57098 |
21.72 |
| 2026-05-17 12:00 |
11:41:54.89 |
+36:22:29.2 |
HIP 56927 |
21.14 |
| 2026-05-18 00:00 |
11:41:48.43 |
+36:21:55.3 |
HIP 56927 |
20.08 |
| 2026-05-18 12:00 |
11:41:42.07 |
+36:21:20.7 |
HIP 56927 |
19.08 |
| 2026-05-19 00:00 |
11:41:35.80 |
+36:20:45.5 |
HIP 56927 |
18.16 |
| 2026-05-19 12:00 |
11:41:29.61 |
+36:20:09.6 |
HIP 56927 |
17.33 |
| 2026-05-20 00:00 |
11:41:23.51 |
+36:19:33.2 |
HIP 56927 |
16.59 |
| 2026-05-20 12:00 |
11:41:17.51 |
+36:18:56.1 |
HIP 56927 |
15.95 |
| 2026-05-21 00:00 |
11:41:11.59 |
+36:18:18.4 |
HIP 56927 |
15.42 |
| 2026-05-21 12:00 |
11:41:05.76 |
+36:17:40.0 |
HIP 56927 |
15.02 |
| 2026-05-22 00:00 |
11:41:00.02 |
+36:17:01.1 |
HIP 56927 |
14.75 |
| 2026-05-22 12:00 |
11:40:54.37 |
+36:16:21.6 |
HIP 56927 |
14.61 |
| 2026-05-23 00:00 |
11:40:48.81 |
+36:15:41.5 |
HIP 56927 |
14.60 |
| 2026-05-23 12:00 |
11:40:43.34 |
+36:15:00.8 |
HIP 56927 |
14.73 |
| 2026-05-24 00:00 |
11:40:37.96 |
+36:14:19.5 |
HIP 56927 |
14.98 |
| 2026-05-24 12:00 |
11:40:32.68 |
+36:13:37.7 |
HIP 56927 |
15.35 |
| 2026-05-25 00:00 |
11:40:27.48 |
+36:12:55.3 |
HIP 56927 |
15.83 |
| 2026-05-25 12:00 |
11:40:22.37 |
+36:12:12.4 |
HIP 56927 |
16.40 |
| 2026-05-26 00:00 |
11:40:17.35 |
+36:11:28.8 |
HIP 56927 |
17.05 |
| 2026-05-26 12:00 |
11:40:12.42 |
+36:10:44.8 |
HIP 56927 |
17.78 |
| 2026-05-27 00:00 |
11:40:07.59 |
+36:10:00.2 |
HIP 56927 |
18.56 |
| 2026-05-27 12:00 |
11:40:02.84 |
+36:09:15.1 |
HIP 56927 |
19.40 |
| 2026-05-28 00:00 |
11:39:58.18 |
+36:08:29.4 |
HIP 56927 |
20.29 |
| 2026-05-28 12:00 |
11:39:53.62 |
+36:07:43.2 |
HIP 56927 |
21.21 |
| 2026-05-29 00:00 |
11:39:49.14 |
+36:06:56.5 |
HIP 56927 |
22.16 |
| 2026-05-29 12:00 |
11:39:44.76 |
+36:06:09.3 |
HIP 56927 |
23.14 |
| 2026-05-30 00:00 |
11:39:40.47 |
+36:05:21.6 |
HIP 56927 |
24.13 |
| 2026-05-30 12:00 |
11:39:36.26 |
+36:04:33.4 |
HIP 56927 |
25.15 |
| 2026-05-31 00:00 |
11:39:32.15 |
+36:03:44.6 |
HIP 56927 |
26.18 |
| 2026-05-31 12:00 |
11:39:28.13 |
+36:02:55.4 |
HIP 56927 |
27.23 |
| 2026-06-01 00:00 |
11:39:24.19 |
+36:02:05.8 |
HIP 56799 |
27.91 |
| 2026-06-01 12:00 |
11:39:20.35 |
+36:01:15.6 |
HIP 56799 |
26.86 |
| 2026-06-02 00:00 |
11:39:16.60 |
+36:00:25.0 |
HIP 56799 |
25.82 |