メタデータ
| 項目 |
値 |
| Designation |
C/2017 U5 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-12-19T02:35:57.655680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:37Z |
| Obs used |
92 |
| NEO |
- |
| M1 |
11.800 |
| 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) |
2017-11-25.0000000 |
| e |
0.74456954 |
| q (au) |
4.326737 |
| a (au) |
16.939001 |
| i (deg) |
18.956551 |
| Ω (om, deg) |
163.115368 |
| ω (w, deg) |
262.150770 |
| M (ma, deg) |
359.659169 |
等級
散乱 + 全体線形
$$
M_a = (14.300 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.300 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.999 |
| 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) |
| 2026-06-01 00:00 |
13:17:58.91 |
+04:37:06.8 |
HIP 64958 |
13.90 |
| 2026-06-01 12:00 |
13:17:55.66 |
+04:37:12.2 |
HIP 64958 |
14.71 |
| 2026-06-02 00:00 |
13:17:52.47 |
+04:37:17.2 |
HIP 64958 |
15.51 |
| 2026-06-02 12:00 |
13:17:49.32 |
+04:37:21.8 |
HIP 64958 |
16.30 |
| 2026-06-03 00:00 |
13:17:46.22 |
+04:37:26.0 |
HIP 64958 |
17.07 |
| 2026-06-03 12:00 |
13:17:43.17 |
+04:37:29.8 |
HIP 64958 |
17.84 |
| 2026-06-04 00:00 |
13:17:40.17 |
+04:37:33.2 |
HIP 64958 |
18.58 |
| 2026-06-04 12:00 |
13:17:37.21 |
+04:37:36.2 |
HIP 64958 |
19.32 |
| 2026-06-05 00:00 |
13:17:34.31 |
+04:37:38.7 |
HIP 64958 |
20.04 |
| 2026-06-05 12:00 |
13:17:31.46 |
+04:37:40.9 |
HIP 64958 |
20.75 |
| 2026-06-06 00:00 |
13:17:28.66 |
+04:37:42.7 |
HIP 64958 |
21.45 |
| 2026-06-06 12:00 |
13:17:25.91 |
+04:37:44.0 |
HIP 64726 |
21.62 |
| 2026-06-07 00:00 |
13:17:23.21 |
+04:37:45.0 |
HIP 64726 |
20.94 |
| 2026-06-07 12:00 |
13:17:20.56 |
+04:37:45.5 |
HIP 64726 |
20.28 |
| 2026-06-08 00:00 |
13:17:17.96 |
+04:37:45.6 |
HIP 64726 |
19.64 |
| 2026-06-08 12:00 |
13:17:15.41 |
+04:37:45.4 |
HIP 64726 |
19.00 |
| 2026-06-09 00:00 |
13:17:12.91 |
+04:37:44.7 |
HIP 64726 |
18.38 |
| 2026-06-09 12:00 |
13:17:10.47 |
+04:37:43.6 |
HIP 64726 |
17.78 |
| 2026-06-10 00:00 |
13:17:08.08 |
+04:37:42.1 |
HIP 64726 |
17.18 |
| 2026-06-10 12:00 |
13:17:05.74 |
+04:37:40.2 |
HIP 64726 |
16.60 |
| 2026-06-11 00:00 |
13:17:03.45 |
+04:37:37.9 |
HIP 64726 |
16.04 |
| 2026-06-11 12:00 |
13:17:01.22 |
+04:37:35.2 |
HIP 64726 |
15.49 |
| 2026-06-12 00:00 |
13:16:59.04 |
+04:37:32.2 |
HIP 64726 |
14.95 |
| 2026-06-12 12:00 |
13:16:56.91 |
+04:37:28.6 |
HIP 64726 |
14.43 |
| 2026-06-13 00:00 |
13:16:54.83 |
+04:37:24.7 |
HIP 64726 |
13.92 |
| 2026-06-13 12:00 |
13:16:52.81 |
+04:37:20.4 |
HIP 64726 |
13.42 |
| 2026-06-14 00:00 |
13:16:50.84 |
+04:37:15.7 |
HIP 64726 |
12.95 |
| 2026-06-14 12:00 |
13:16:48.93 |
+04:37:10.6 |
HIP 64726 |
12.48 |
| 2026-06-15 00:00 |
13:16:47.07 |
+04:37:05.1 |
HIP 64726 |
12.04 |
| 2026-06-15 12:00 |
13:16:45.26 |
+04:36:59.2 |
HIP 64726 |
11.61 |
| 2026-06-16 00:00 |
13:16:43.51 |
+04:36:52.9 |
HIP 64726 |
11.19 |
| 2026-06-16 12:00 |
13:16:41.82 |
+04:36:46.3 |
HIP 64726 |
10.80 |
| 2026-06-17 00:00 |
13:16:40.17 |
+04:36:39.2 |
HIP 64726 |
10.42 |
| 2026-06-17 12:00 |
13:16:38.59 |
+04:36:31.7 |
HIP 64726 |
10.06 |
| 2026-06-18 00:00 |
13:16:37.06 |
+04:36:23.8 |
HIP 64726 |
9.72 |
| 2026-06-18 12:00 |
13:16:35.58 |
+04:36:15.6 |
HIP 64726 |
9.40 |
| 2026-06-19 00:00 |
13:16:34.16 |
+04:36:06.9 |
HIP 64726 |
9.10 |
| 2026-06-19 12:00 |
13:16:32.79 |
+04:35:57.9 |
HIP 64726 |
8.82 |
| 2026-06-20 00:00 |
13:16:31.48 |
+04:35:48.5 |
HIP 64726 |
8.57 |
| 2026-06-20 12:00 |
13:16:30.22 |
+04:35:38.7 |
HIP 64726 |
8.34 |
| 2026-06-21 00:00 |
13:16:29.02 |
+04:35:28.5 |
HIP 64726 |
8.13 |
| 2026-06-21 12:00 |
13:16:27.87 |
+04:35:17.9 |
HIP 64726 |
7.94 |
| 2026-06-22 00:00 |
13:16:26.78 |
+04:35:07.0 |
HIP 64726 |
7.79 |