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 |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-05-12 00:00 |
05:31:41.61 |
-62:22:24.9 |
HIP 25759 |
12.27 |
| 2026-05-12 12:00 |
05:31:52.54 |
-62:21:45.7 |
HIP 25759 |
13.69 |
| 2026-05-13 00:00 |
05:32:03.52 |
-62:21:07.1 |
HIP 26069 |
13.67 |
| 2026-05-13 12:00 |
05:32:14.55 |
-62:20:29.0 |
HIP 26069 |
13.10 |
| 2026-05-14 00:00 |
05:32:25.63 |
-62:19:51.5 |
HIP 26069 |
12.66 |
| 2026-05-14 12:00 |
05:32:36.75 |
-62:19:14.5 |
HIP 26069 |
12.35 |
| 2026-05-15 00:00 |
05:32:47.91 |
-62:18:38.1 |
HIP 26069 |
12.19 |
| 2026-05-15 12:00 |
05:32:59.12 |
-62:18:02.4 |
HIP 26069 |
12.19 |
| 2026-05-16 00:00 |
05:33:10.37 |
-62:17:27.2 |
HIP 26069 |
12.35 |
| 2026-05-16 12:00 |
05:33:21.66 |
-62:16:52.5 |
HIP 26069 |
12.65 |
| 2026-05-17 00:00 |
05:33:33.00 |
-62:16:18.5 |
HIP 26069 |
13.09 |
| 2026-05-17 12:00 |
05:33:44.37 |
-62:15:45.1 |
HIP 26069 |
13.66 |
| 2026-05-18 00:00 |
05:33:55.79 |
-62:15:12.2 |
HIP 26069 |
14.34 |
| 2026-05-18 12:00 |
05:34:07.25 |
-62:14:40.0 |
HIP 26069 |
15.12 |
| 2026-05-19 00:00 |
05:34:18.74 |
-62:14:08.3 |
HIP 26266 |
14.36 |
| 2026-05-19 12:00 |
05:34:30.27 |
-62:13:37.3 |
HIP 26266 |
13.12 |
| 2026-05-20 00:00 |
05:34:41.84 |
-62:13:06.8 |
HIP 26266 |
11.92 |
| 2026-05-20 12:00 |
05:34:53.45 |
-62:12:37.0 |
HIP 26266 |
10.80 |
| 2026-05-21 00:00 |
05:35:05.09 |
-62:12:07.7 |
HIP 26266 |
9.77 |
| 2026-05-21 12:00 |
05:35:16.77 |
-62:11:39.0 |
HIP 26266 |
8.87 |
| 2026-05-22 00:00 |
05:35:28.48 |
-62:11:11.0 |
HIP 26266 |
8.13 |
| 2026-05-22 12:00 |
05:35:40.23 |
-62:10:43.6 |
HIP 26266 |
7.61 |
| 2026-05-23 00:00 |
05:35:52.01 |
-62:10:16.7 |
HIP 26266 |
7.36 |
| 2026-05-23 12:00 |
05:36:03.82 |
-62:09:50.5 |
HIP 26266 |
7.39 |
| 2026-05-24 00:00 |
05:36:15.66 |
-62:09:24.9 |
HIP 26266 |
7.72 |
| 2026-05-24 12:00 |
05:36:27.54 |
-62:09:00.0 |
HIP 26266 |
8.29 |
| 2026-05-25 00:00 |
05:36:39.45 |
-62:08:35.5 |
HIP 26266 |
9.08 |
| 2026-05-25 12:00 |
05:36:51.38 |
-62:08:11.7 |
HIP 26266 |
10.02 |
| 2026-05-26 00:00 |
05:37:03.35 |
-62:07:48.6 |
HIP 26266 |
11.08 |
| 2026-05-26 12:00 |
05:37:15.34 |
-62:07:26.0 |
HIP 26266 |
12.23 |
| 2026-05-27 00:00 |
05:37:27.36 |
-62:07:04.1 |
HIP 26266 |
13.45 |
| 2026-05-27 12:00 |
05:37:39.41 |
-62:06:42.8 |
HIP 26266 |
14.71 |
| 2026-05-28 00:00 |
05:37:51.49 |
-62:06:22.1 |
HIP 26266 |
16.02 |
| 2026-05-28 12:00 |
05:38:03.59 |
-62:06:02.0 |
HIP 26266 |
17.35 |
| 2026-05-29 00:00 |
05:38:15.72 |
-62:05:42.6 |
HIP 26266 |
18.70 |
| 2026-05-29 12:00 |
05:38:27.88 |
-62:05:23.7 |
HIP 26266 |
20.08 |
| 2026-05-30 00:00 |
05:38:40.06 |
-62:05:05.5 |
HIP 26266 |
21.47 |
| 2026-05-30 12:00 |
05:38:52.26 |
-62:04:47.9 |
HIP 26760 |
20.51 |
| 2026-05-31 00:00 |
05:39:04.49 |
-62:04:30.9 |
HIP 26760 |
19.25 |
| 2026-05-31 12:00 |
05:39:16.74 |
-62:04:14.6 |
HIP 26760 |
18.02 |
| 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 |