C/2013 G8 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
C/2013 G8 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-11-14T23:30:02.741760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:34Z |
| Obs used |
147 |
| NEO |
- |
| M1 |
7.700 |
| K1 |
11.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-09-14.0000000 |
| e |
0.99844886 |
| q (au) |
5.141176 |
| a (au) |
3314.451067 |
| i (deg) |
27.615046 |
| Ω (om, deg) |
241.021944 |
| ω (w, deg) |
80.168493 |
| M (ma, deg) |
359.999680 |
等級
散乱 + 全体線形
$$
M_a = (12.524 + 2.882\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.524 |
| n |
2.882 |
| gf |
1.000 |
| gb |
-0.652 |
| k |
0.800 |
| 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 |
05:34:36.78 |
+10:49:08.6 |
HIP 26239 |
21.66 |
| 2026-02-03 12:00 |
05:34:34.20 |
+10:49:15.0 |
HIP 26239 |
22.11 |
| 2026-02-04 00:00 |
05:34:31.65 |
+10:49:21.6 |
HIP 26239 |
22.56 |
| 2026-02-04 12:00 |
05:34:29.14 |
+10:49:28.3 |
HIP 26239 |
23.01 |
| 2026-02-05 00:00 |
05:34:26.66 |
+10:49:35.1 |
HIP 26239 |
23.47 |
| 2026-02-05 12:00 |
05:34:24.22 |
+10:49:41.9 |
HIP 26239 |
23.94 |
| 2026-02-06 00:00 |
05:34:21.81 |
+10:49:48.9 |
HIP 26239 |
24.40 |
| 2026-02-06 12:00 |
05:34:19.44 |
+10:49:56.0 |
HIP 26239 |
24.87 |
| 2026-02-07 00:00 |
05:34:17.10 |
+10:50:03.1 |
HIP 26239 |
25.33 |
| 2026-02-07 12:00 |
05:34:14.80 |
+10:50:10.4 |
HIP 26239 |
25.80 |
| 2026-02-08 00:00 |
05:34:12.53 |
+10:50:17.8 |
HIP 26239 |
26.27 |
| 2026-02-08 12:00 |
05:34:10.30 |
+10:50:25.2 |
HIP 26028 |
26.16 |
| 2026-02-09 00:00 |
05:34:08.11 |
+10:50:32.8 |
HIP 26028 |
25.76 |
| 2026-02-09 12:00 |
05:34:05.95 |
+10:50:40.4 |
HIP 26028 |
25.37 |
| 2026-02-10 00:00 |
05:34:03.83 |
+10:50:48.1 |
HIP 26028 |
24.99 |
| 2026-02-10 12:00 |
05:34:01.75 |
+10:50:55.9 |
HIP 26028 |
24.61 |
| 2026-02-11 00:00 |
05:33:59.70 |
+10:51:03.8 |
HIP 26028 |
24.25 |
| 2026-02-11 12:00 |
05:33:57.69 |
+10:51:11.8 |
HIP 26028 |
23.89 |
| 2026-02-12 00:00 |
05:33:55.72 |
+10:51:19.9 |
HIP 26028 |
23.54 |
| 2026-02-12 12:00 |
05:33:53.78 |
+10:51:28.1 |
HIP 26028 |
23.20 |
| 2026-02-13 00:00 |
05:33:51.88 |
+10:51:36.4 |
HIP 26028 |
22.87 |
| 2026-02-13 12:00 |
05:33:50.02 |
+10:51:44.7 |
HIP 26028 |
22.55 |
| 2026-02-14 00:00 |
05:33:48.20 |
+10:51:53.1 |
HIP 26028 |
22.23 |
| 2026-02-14 12:00 |
05:33:46.42 |
+10:52:01.6 |
HIP 26028 |
21.92 |
| 2026-02-15 00:00 |
05:33:44.67 |
+10:52:10.2 |
HIP 26028 |
21.62 |
| 2026-02-15 12:00 |
05:33:42.97 |
+10:52:18.9 |
HIP 26028 |
21.33 |
| 2026-02-16 00:00 |
05:33:41.30 |
+10:52:27.7 |
HIP 26028 |
21.05 |
| 2026-02-16 12:00 |
05:33:39.67 |
+10:52:36.5 |
HIP 26028 |
20.77 |
| 2026-02-17 00:00 |
05:33:38.08 |
+10:52:45.4 |
HIP 26028 |
20.50 |
| 2026-02-17 12:00 |
05:33:36.53 |
+10:52:54.4 |
HIP 26028 |
20.24 |
| 2026-02-18 00:00 |
05:33:35.02 |
+10:53:03.4 |
HIP 26028 |
19.98 |
| 2026-02-18 12:00 |
05:33:33.55 |
+10:53:12.6 |
HIP 26028 |
19.73 |
| 2026-02-19 00:00 |
05:33:32.11 |
+10:53:21.8 |
HIP 26028 |
19.49 |
| 2026-02-19 12:00 |
05:33:30.72 |
+10:53:31.1 |
HIP 26028 |
19.25 |
| 2026-02-20 00:00 |
05:33:29.37 |
+10:53:40.4 |
HIP 26028 |
19.02 |
| 2026-02-20 12:00 |
05:33:28.05 |
+10:53:49.8 |
HIP 26028 |
18.79 |
| 2026-02-21 00:00 |
05:33:26.78 |
+10:53:59.3 |
HIP 26028 |
18.57 |
| 2026-02-21 12:00 |
05:33:25.54 |
+10:54:08.9 |
HIP 26028 |
18.35 |
| 2026-02-22 00:00 |
05:33:24.35 |
+10:54:18.5 |
HIP 26028 |
18.14 |
| 2026-02-22 12:00 |
05:33:23.19 |
+10:54:28.2 |
HIP 26028 |
17.93 |
| 2026-02-23 00:00 |
05:33:22.08 |
+10:54:37.9 |
HIP 26028 |
17.72 |
| 2026-02-23 12:00 |
05:33:21.01 |
+10:54:47.7 |
HIP 26028 |
17.52 |
| 2026-02-24 00:00 |
05:33:19.97 |
+10:54:57.6 |
HIP 26028 |
17.32 |