メタデータ
| 項目 |
値 |
| Designation |
C/2015 GX (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-08-26T15:53:06.691200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:09Z |
| Obs used |
318 |
| NEO |
- |
| M1 |
14.200 |
| K1 |
7.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-09-13.0000000 |
| e |
0.87819882 |
| q (au) |
1.971753 |
| a (au) |
16.188294 |
| i (deg) |
90.254528 |
| Ω (om, deg) |
235.515503 |
| ω (w, deg) |
108.957919 |
| M (ma, deg) |
0.262364 |
等級
散乱 + 全体線形
$$
M_a = (8.937 + 5.219\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.937 |
| n |
5.219 |
| gf |
0.999 |
| gb |
-0.627 |
| 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) |
| 2026-06-01 00:00 |
05:39:29.01 |
-62:03:58.9 |
HIP 26760 |
16.84 |
| 2026-06-01 12:00 |
05:39:41.30 |
-62:03:43.8 |
HIP 26760 |
15.71 |
| 2026-06-02 00:00 |
05:39:53.62 |
-62:03:29.3 |
HIP 26760 |
14.65 |
| 2026-06-02 12:00 |
05:40:05.95 |
-62:03:15.5 |
HIP 26760 |
13.68 |
| 2026-06-03 00:00 |
05:40:18.31 |
-62:03:02.3 |
HIP 26760 |
12.80 |
| 2026-06-03 12:00 |
05:40:30.68 |
-62:02:49.7 |
HIP 26760 |
12.05 |
| 2026-06-04 00:00 |
05:40:43.08 |
-62:02:37.7 |
HIP 26760 |
11.45 |
| 2026-06-04 12:00 |
05:40:55.49 |
-62:02:26.4 |
HIP 26760 |
11.03 |
| 2026-06-05 00:00 |
05:41:07.92 |
-62:02:15.7 |
HIP 26760 |
10.80 |
| 2026-06-05 12:00 |
05:41:20.37 |
-62:02:05.7 |
HIP 26760 |
10.78 |
| 2026-06-06 00:00 |
05:41:32.83 |
-62:01:56.2 |
HIP 26760 |
10.97 |
| 2026-06-06 12:00 |
05:41:45.31 |
-62:01:47.4 |
HIP 26760 |
11.36 |
| 2026-06-07 00:00 |
05:41:57.81 |
-62:01:39.3 |
HIP 26760 |
11.93 |
| 2026-06-07 12:00 |
05:42:10.32 |
-62:01:31.8 |
HIP 26760 |
12.66 |
| 2026-06-08 00:00 |
05:42:22.84 |
-62:01:24.9 |
HIP 26760 |
13.52 |
| 2026-06-08 12:00 |
05:42:35.38 |
-62:01:18.7 |
HIP 26760 |
14.49 |
| 2026-06-09 00:00 |
05:42:47.93 |
-62:01:13.1 |
HIP 26760 |
15.55 |
| 2026-06-09 12:00 |
05:43:00.50 |
-62:01:08.1 |
HIP 26760 |
16.68 |
| 2026-06-10 00:00 |
05:43:13.07 |
-62:01:03.8 |
HIP 26760 |
17.86 |
| 2026-06-10 12:00 |
05:43:25.66 |
-62:01:00.1 |
HIP 26760 |
19.10 |
| 2026-06-11 00:00 |
05:43:38.26 |
-62:00:57.1 |
HIP 26760 |
20.37 |
| 2026-06-11 12:00 |
05:43:50.87 |
-62:00:54.7 |
HIP 26760 |
21.68 |
| 2026-06-12 00:00 |
05:44:03.49 |
-62:00:52.9 |
HIP 26760 |
23.01 |
| 2026-06-12 12:00 |
05:44:16.11 |
-62:00:51.8 |
HIP 26760 |
24.37 |
| 2026-06-13 00:00 |
05:44:28.75 |
-62:00:51.4 |
HIP 26760 |
25.74 |
| 2026-06-13 12:00 |
05:44:41.39 |
-62:00:51.6 |
HIP 26760 |
27.13 |
| 2026-06-14 00:00 |
05:44:54.04 |
-62:00:52.4 |
HIP 26760 |
28.54 |
| 2026-06-14 12:00 |
05:45:06.69 |
-62:00:53.9 |
HIP 26760 |
29.96 |
| 2026-06-15 00:00 |
05:45:19.35 |
-62:00:56.1 |
HIP 26760 |
31.38 |
| 2026-06-15 12:00 |
05:45:32.02 |
-62:00:58.8 |
HIP 26760 |
32.82 |
| 2026-06-16 00:00 |
05:45:44.68 |
-62:01:02.3 |
HIP 27568 |
32.33 |
| 2026-06-16 12:00 |
05:45:57.36 |
-62:01:06.4 |
HIP 27568 |
30.85 |
| 2026-06-17 00:00 |
05:46:10.03 |
-62:01:11.1 |
HIP 27568 |
29.36 |
| 2026-06-17 12:00 |
05:46:22.71 |
-62:01:16.5 |
HIP 27568 |
27.88 |
| 2026-06-18 00:00 |
05:46:35.38 |
-62:01:22.5 |
HIP 27568 |
26.39 |
| 2026-06-18 12:00 |
05:46:48.06 |
-62:01:29.2 |
HIP 27568 |
24.90 |
| 2026-06-19 00:00 |
05:47:00.74 |
-62:01:36.5 |
HIP 27568 |
23.42 |
| 2026-06-19 12:00 |
05:47:13.42 |
-62:01:44.5 |
HIP 27568 |
21.93 |
| 2026-06-20 00:00 |
05:47:26.09 |
-62:01:53.1 |
HIP 27568 |
20.43 |
| 2026-06-20 12:00 |
05:47:38.76 |
-62:02:02.3 |
HIP 27568 |
18.94 |
| 2026-06-21 00:00 |
05:47:51.43 |
-62:02:12.2 |
HIP 27568 |
17.45 |
| 2026-06-21 12:00 |
05:48:04.10 |
-62:02:22.8 |
HIP 27568 |
15.95 |
| 2026-06-22 00:00 |
05:48:16.76 |
-62:02:33.9 |
HIP 27568 |
14.46 |