メタデータ
| 項目 |
値 |
| Designation |
87P/Bus |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-12-19T21:38:08.010240Z |
| Orbit solution date (soln_date, UTC) |
2020-09-28T09:20:31Z |
| Obs used |
667 |
| NEO |
- |
| M1 |
12.700 |
| K1 |
14.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-03-20.0000000 |
| e |
0.38934769 |
| q (au) |
2.101175 |
| a (au) |
3.440869 |
| i (deg) |
2.602394 |
| Ω (om, deg) |
181.889806 |
| ω (w, deg) |
24.756386 |
| M (ma, deg) |
126.793522 |
等級
散乱 + 全体線形
$$
M_a = (12.080 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.080 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.756 |
| 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) |
| 2026-05-12 00:00 |
06:19:23.71 |
+20:07:48.9 |
HIP 30110 |
19.12 |
| 2026-05-12 12:00 |
06:19:48.32 |
+20:07:51.0 |
HIP 30110 |
16.38 |
| 2026-05-13 00:00 |
06:20:13.02 |
+20:07:52.7 |
HIP 30110 |
15.43 |
| 2026-05-13 12:00 |
06:20:37.81 |
+20:07:54.0 |
HIP 30110 |
16.59 |
| 2026-05-14 00:00 |
06:21:02.67 |
+20:07:54.9 |
HIP 30229 |
16.35 |
| 2026-05-14 12:00 |
06:21:27.62 |
+20:07:55.4 |
HIP 30229 |
14.52 |
| 2026-05-15 00:00 |
06:21:52.66 |
+20:07:55.5 |
HIP 30229 |
14.94 |
| 2026-05-15 12:00 |
06:22:17.77 |
+20:07:55.2 |
HIP 30229 |
17.47 |
| 2026-05-16 00:00 |
06:22:42.96 |
+20:07:54.5 |
HIP 30393 |
18.93 |
| 2026-05-16 12:00 |
06:23:08.24 |
+20:07:53.5 |
HIP 30393 |
16.35 |
| 2026-05-17 00:00 |
06:23:33.59 |
+20:07:52.0 |
HIP 30446 |
14.89 |
| 2026-05-17 12:00 |
06:23:59.02 |
+20:07:50.1 |
HIP 30446 |
13.31 |
| 2026-05-18 00:00 |
06:24:24.52 |
+20:07:47.8 |
HIP 30446 |
14.29 |
| 2026-05-18 12:00 |
06:24:50.11 |
+20:07:45.1 |
HIP 30446 |
17.41 |
| 2026-05-19 00:00 |
06:25:15.76 |
+20:07:42.0 |
HIP 30647 |
16.81 |
| 2026-05-19 12:00 |
06:25:41.49 |
+20:07:38.4 |
HIP 30647 |
11.07 |
| 2026-05-20 00:00 |
06:26:07.30 |
+20:07:34.5 |
HIP 30647 |
5.93 |
| 2026-05-20 12:00 |
06:26:33.17 |
+20:07:30.1 |
HIP 30647 |
4.61 |
| 2026-05-21 00:00 |
06:26:59.12 |
+20:07:25.4 |
HIP 30647 |
9.02 |
| 2026-05-21 12:00 |
06:27:25.13 |
+20:07:20.2 |
HIP 30647 |
14.70 |
| 2026-05-22 00:00 |
06:27:51.22 |
+20:07:14.6 |
HIP 30883 |
16.56 |
| 2026-05-22 12:00 |
06:28:17.37 |
+20:07:08.5 |
HIP 30883 |
11.01 |
| 2026-05-23 00:00 |
06:28:43.59 |
+20:07:02.1 |
HIP 30883 |
6.60 |
| 2026-05-23 12:00 |
06:29:09.88 |
+20:06:55.2 |
HIP 30883 |
6.46 |
| 2026-05-24 00:00 |
06:29:36.23 |
+20:06:48.0 |
HIP 30883 |
10.80 |
| 2026-05-24 12:00 |
06:30:02.65 |
+20:06:40.2 |
HIP 30883 |
16.38 |
| 2026-05-25 00:00 |
06:30:29.13 |
+20:06:32.1 |
HIP 31033 |
18.95 |
| 2026-05-25 12:00 |
06:30:55.67 |
+20:06:23.5 |
HIP 31140 |
18.83 |
| 2026-05-26 00:00 |
06:31:22.28 |
+20:06:14.6 |
HIP 31140 |
14.21 |
| 2026-05-26 12:00 |
06:31:48.94 |
+20:06:05.1 |
HIP 31140 |
11.28 |
| 2026-05-27 00:00 |
06:32:15.67 |
+20:05:55.3 |
HIP 31140 |
11.45 |
| 2026-05-27 12:00 |
06:32:42.46 |
+20:05:45.0 |
HIP 31140 |
14.62 |
| 2026-05-28 00:00 |
06:33:09.31 |
+20:05:34.3 |
HIP 31249 |
15.05 |
| 2026-05-28 12:00 |
06:33:36.21 |
+20:05:23.2 |
HIP 31249 |
15.48 |
| 2026-05-29 00:00 |
06:34:03.18 |
+20:05:11.6 |
HIP 31249 |
18.25 |
| 2026-05-29 12:00 |
06:34:30.20 |
+20:04:59.6 |
HIP 31249 |
22.52 |
| 2026-05-30 00:00 |
06:34:57.28 |
+20:04:47.2 |
HIP 31249 |
27.61 |
| 2026-05-30 12:00 |
06:35:24.41 |
+20:04:34.3 |
HIP 31626 |
30.63 |
| 2026-05-31 00:00 |
06:35:51.60 |
+20:04:21.0 |
HIP 31626 |
25.84 |
| 2026-05-31 12:00 |
06:36:18.84 |
+20:04:07.2 |
HIP 31680 |
19.74 |
| 2026-06-01 00:00 |
06:36:46.13 |
+20:03:53.0 |
HIP 31680 |
13.40 |
| 2026-06-01 12:00 |
06:37:13.48 |
+20:03:38.4 |
HIP 31680 |
7.17 |
| 2026-06-02 00:00 |
06:37:40.88 |
+20:03:23.3 |
HIP 31680 |
2.45 |