C/2015 GX (PANSTARRS)
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) |
| 2026-02-03 00:00 |
05:23:19.52 |
-66:08:03.4 |
HIP 25097 |
9.59 |
| 2026-02-03 12:00 |
05:23:11.19 |
-66:07:00.2 |
HIP 25097 |
9.99 |
| 2026-02-04 00:00 |
05:23:02.98 |
-66:05:56.5 |
HIP 25097 |
10.56 |
| 2026-02-04 12:00 |
05:22:54.88 |
-66:04:52.3 |
HIP 25097 |
11.27 |
| 2026-02-05 00:00 |
05:22:46.89 |
-66:03:47.7 |
HIP 25097 |
12.11 |
| 2026-02-05 12:00 |
05:22:39.02 |
-66:02:42.5 |
HIP 25097 |
13.03 |
| 2026-02-06 00:00 |
05:22:31.27 |
-66:01:36.9 |
HIP 25097 |
14.04 |
| 2026-02-06 12:00 |
05:22:23.64 |
-66:00:30.9 |
HIP 24988 |
15.02 |
| 2026-02-07 00:00 |
05:22:16.12 |
-65:59:24.4 |
HIP 24988 |
13.67 |
| 2026-02-07 12:00 |
05:22:08.72 |
-65:58:17.5 |
HIP 24988 |
12.33 |
| 2026-02-08 00:00 |
05:22:01.43 |
-65:57:10.1 |
HIP 24988 |
10.98 |
| 2026-02-08 12:00 |
05:21:54.27 |
-65:56:02.3 |
HIP 24988 |
9.63 |
| 2026-02-09 00:00 |
05:21:47.23 |
-65:54:54.1 |
HIP 24988 |
8.29 |
| 2026-02-09 12:00 |
05:21:40.30 |
-65:53:45.4 |
HIP 24988 |
6.95 |
| 2026-02-10 00:00 |
05:21:33.50 |
-65:52:36.4 |
HIP 24988 |
5.61 |
| 2026-02-10 12:00 |
05:21:26.81 |
-65:51:26.9 |
HIP 24988 |
4.27 |
| 2026-02-11 00:00 |
05:21:20.25 |
-65:50:17.1 |
HIP 24988 |
2.94 |
| 2026-02-11 12:00 |
05:21:13.81 |
-65:49:06.8 |
HIP 24988 |
1.64 |
| 2026-02-12 00:00 |
05:21:07.49 |
-65:47:56.2 |
HIP 24988 |
0.60 |
| 2026-02-12 12:00 |
05:21:01.29 |
-65:46:45.2 |
HIP 24988 |
1.29 |
| 2026-02-13 00:00 |
05:20:55.21 |
-65:45:33.9 |
HIP 24988 |
2.56 |
| 2026-02-13 12:00 |
05:20:49.25 |
-65:44:22.2 |
HIP 24988 |
3.89 |
| 2026-02-14 00:00 |
05:20:43.42 |
-65:43:10.1 |
HIP 24988 |
5.22 |
| 2026-02-14 12:00 |
05:20:37.71 |
-65:41:57.7 |
HIP 24988 |
6.56 |
| 2026-02-15 00:00 |
05:20:32.13 |
-65:40:45.0 |
HIP 25040 |
7.58 |
| 2026-02-15 12:00 |
05:20:26.66 |
-65:39:31.9 |
HIP 25039 |
7.91 |
| 2026-02-16 00:00 |
05:20:21.33 |
-65:38:18.5 |
HIP 25039 |
8.39 |
| 2026-02-16 12:00 |
05:20:16.11 |
-65:37:04.7 |
HIP 25039 |
9.04 |
| 2026-02-17 00:00 |
05:20:11.02 |
-65:35:50.7 |
HIP 25039 |
9.82 |
| 2026-02-17 12:00 |
05:20:06.05 |
-65:34:36.4 |
HIP 25039 |
10.71 |
| 2026-02-18 00:00 |
05:20:01.21 |
-65:33:21.8 |
HIP 25039 |
11.67 |
| 2026-02-18 12:00 |
05:19:56.49 |
-65:32:06.9 |
HIP 25039 |
12.69 |
| 2026-02-19 00:00 |
05:19:51.90 |
-65:30:51.7 |
HIP 25039 |
13.76 |
| 2026-02-19 12:00 |
05:19:47.43 |
-65:29:36.2 |
HIP 25039 |
14.87 |
| 2026-02-20 00:00 |
05:19:43.09 |
-65:28:20.5 |
HIP 25039 |
16.00 |
| 2026-02-20 12:00 |
05:19:38.87 |
-65:27:04.5 |
HIP 25039 |
17.16 |
| 2026-02-21 00:00 |
05:19:34.78 |
-65:25:48.3 |
HIP 25039 |
18.34 |
| 2026-02-21 12:00 |
05:19:30.81 |
-65:24:31.8 |
HIP 25039 |
19.53 |
| 2026-02-22 00:00 |
05:19:26.97 |
-65:23:15.1 |
HIP 25039 |
20.73 |
| 2026-02-22 12:00 |
05:19:23.25 |
-65:21:58.2 |
HIP 25039 |
21.95 |
| 2026-02-23 00:00 |
05:19:19.65 |
-65:20:41.1 |
HIP 25039 |
23.17 |
| 2026-02-23 12:00 |
05:19:16.18 |
-65:19:23.7 |
HIP 25039 |
24.40 |
| 2026-02-24 00:00 |
05:19:12.84 |
-65:18:06.2 |
HIP 25039 |
25.64 |