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) |
| 2026-03-26 00:00 |
05:19:31.57 |
-63:58:36.1 |
HIP 24983 |
11.23 |
| 2026-03-26 12:00 |
05:19:35.34 |
-63:57:18.8 |
HIP 24983 |
11.64 |
| 2026-03-27 00:00 |
05:19:39.21 |
-63:56:01.6 |
HIP 24983 |
12.17 |
| 2026-03-27 12:00 |
05:19:43.19 |
-63:54:44.7 |
HIP 24983 |
12.81 |
| 2026-03-28 00:00 |
05:19:47.27 |
-63:53:27.9 |
HIP 24983 |
13.55 |
| 2026-03-28 12:00 |
05:19:51.45 |
-63:52:11.4 |
HIP 24983 |
14.36 |
| 2026-03-29 00:00 |
05:19:55.73 |
-63:50:55.1 |
HIP 24983 |
15.25 |
| 2026-03-29 12:00 |
05:20:00.11 |
-63:49:39.0 |
HIP 24983 |
16.19 |
| 2026-03-30 00:00 |
05:20:04.59 |
-63:48:23.2 |
HIP 24983 |
17.18 |
| 2026-03-30 12:00 |
05:20:09.17 |
-63:47:07.6 |
HIP 24963 |
16.27 |
| 2026-03-31 00:00 |
05:20:13.86 |
-63:45:52.2 |
HIP 24963 |
14.92 |
| 2026-03-31 12:00 |
05:20:18.64 |
-63:44:37.1 |
HIP 24963 |
13.57 |
| 2026-04-01 00:00 |
05:20:23.51 |
-63:43:22.2 |
HIP 24963 |
12.23 |
| 2026-04-01 12:00 |
05:20:28.49 |
-63:42:07.6 |
HIP 24963 |
10.89 |
| 2026-04-02 00:00 |
05:20:33.56 |
-63:40:53.3 |
HIP 24963 |
9.56 |
| 2026-04-02 12:00 |
05:20:38.73 |
-63:39:39.2 |
HIP 24963 |
8.24 |
| 2026-04-03 00:00 |
05:20:43.99 |
-63:38:25.3 |
HIP 24963 |
6.95 |
| 2026-04-03 12:00 |
05:20:49.35 |
-63:37:11.8 |
HIP 24963 |
5.69 |
| 2026-04-04 00:00 |
05:20:54.81 |
-63:35:58.5 |
HIP 24963 |
4.49 |
| 2026-04-04 12:00 |
05:21:00.36 |
-63:34:45.6 |
HIP 24963 |
3.44 |
| 2026-04-05 00:00 |
05:21:06.00 |
-63:33:32.9 |
HIP 24963 |
2.69 |
| 2026-04-05 12:00 |
05:21:11.73 |
-63:32:20.5 |
HIP 24963 |
2.54 |
| 2026-04-06 00:00 |
05:21:17.56 |
-63:31:08.4 |
HIP 24963 |
3.07 |
| 2026-04-06 12:00 |
05:21:23.48 |
-63:29:56.6 |
HIP 24963 |
4.03 |
| 2026-04-07 00:00 |
05:21:29.49 |
-63:28:45.1 |
HIP 24963 |
5.18 |
| 2026-04-07 12:00 |
05:21:35.60 |
-63:27:33.9 |
HIP 24963 |
6.42 |
| 2026-04-08 00:00 |
05:21:41.79 |
-63:26:23.0 |
HIP 24963 |
7.71 |
| 2026-04-08 12:00 |
05:21:48.07 |
-63:25:12.5 |
HIP 24963 |
9.02 |
| 2026-04-09 00:00 |
05:21:54.45 |
-63:24:02.3 |
HIP 24963 |
10.36 |
| 2026-04-09 12:00 |
05:22:00.91 |
-63:22:52.4 |
HIP 24963 |
11.70 |
| 2026-04-10 00:00 |
05:22:07.46 |
-63:21:42.9 |
HIP 24963 |
13.06 |
| 2026-04-10 12:00 |
05:22:14.09 |
-63:20:33.7 |
HIP 24963 |
14.42 |
| 2026-04-11 00:00 |
05:22:20.82 |
-63:19:24.8 |
HIP 24963 |
15.78 |
| 2026-04-11 12:00 |
05:22:27.63 |
-63:18:16.3 |
HIP 24963 |
17.15 |
| 2026-04-12 00:00 |
05:22:34.53 |
-63:17:08.1 |
HIP 24963 |
18.52 |
| 2026-04-12 12:00 |
05:22:41.51 |
-63:16:00.4 |
HIP 24963 |
19.89 |
| 2026-04-13 00:00 |
05:22:48.58 |
-63:14:52.9 |
HIP 25120 |
21.16 |
| 2026-04-13 12:00 |
05:22:55.73 |
-63:13:45.9 |
HIP 25120 |
20.11 |
| 2026-04-14 00:00 |
05:23:02.96 |
-63:12:39.2 |
HIP 25120 |
19.11 |
| 2026-04-14 12:00 |
05:23:10.28 |
-63:11:32.9 |
HIP 25120 |
18.16 |
| 2026-04-15 00:00 |
05:23:17.69 |
-63:10:27.0 |
HIP 25120 |
17.28 |
| 2026-04-15 12:00 |
05:23:25.17 |
-63:09:21.4 |
HIP 25120 |
16.49 |
| 2026-04-16 00:00 |
05:23:32.73 |
-63:08:16.3 |
HIP 25120 |
15.78 |