C/2013 P2 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
C/2013 P2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-02-17T01:18:12.876480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:38Z |
| Obs used |
295 |
| NEO |
- |
| M1 |
14.700 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-02-23.0000000 |
| e |
0.99890182 |
| q (au) |
2.834925 |
| a (au) |
2581.478285 |
| i (deg) |
125.532159 |
| Ω (om, deg) |
2.028690 |
| ω (w, deg) |
104.973695 |
| M (ma, deg) |
0.000045 |
等級
散乱 + 全体線形
$$
M_a = (13.539 + 2.416\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.539 |
| n |
2.416 |
| gf |
0.907 |
| gb |
-0.906 |
| k |
1.000 |
| δ90 |
1.000 |
| 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 |
07:47:02.72 |
-30:06:40.0 |
HIP 37957 |
10.14 |
| 2026-02-03 12:00 |
07:46:57.34 |
-30:06:16.2 |
HIP 37957 |
9.50 |
| 2026-02-04 00:00 |
07:46:51.97 |
-30:05:52.0 |
HIP 37957 |
8.97 |
| 2026-02-04 12:00 |
07:46:46.62 |
-30:05:27.4 |
HIP 37957 |
8.58 |
| 2026-02-05 00:00 |
07:46:41.29 |
-30:05:02.3 |
HIP 37957 |
8.35 |
| 2026-02-05 12:00 |
07:46:35.98 |
-30:04:36.9 |
HIP 37957 |
8.29 |
| 2026-02-06 00:00 |
07:46:30.68 |
-30:04:11.0 |
HIP 37957 |
8.39 |
| 2026-02-06 12:00 |
07:46:25.41 |
-30:03:44.6 |
HIP 37957 |
8.67 |
| 2026-02-07 00:00 |
07:46:20.15 |
-30:03:17.9 |
HIP 37957 |
9.09 |
| 2026-02-07 12:00 |
07:46:14.91 |
-30:02:50.8 |
HIP 37872 |
8.52 |
| 2026-02-08 00:00 |
07:46:09.70 |
-30:02:23.2 |
HIP 37872 |
7.40 |
| 2026-02-08 12:00 |
07:46:04.50 |
-30:01:55.3 |
HIP 37872 |
6.31 |
| 2026-02-09 00:00 |
07:45:59.33 |
-30:01:26.9 |
HIP 37872 |
5.27 |
| 2026-02-09 12:00 |
07:45:54.17 |
-30:00:58.2 |
HIP 37872 |
4.32 |
| 2026-02-10 00:00 |
07:45:49.04 |
-30:00:29.0 |
HIP 37872 |
3.53 |
| 2026-02-10 12:00 |
07:45:43.93 |
-29:59:59.5 |
HIP 37872 |
3.03 |
| 2026-02-11 00:00 |
07:45:38.84 |
-29:59:29.6 |
HIP 37872 |
2.97 |
| 2026-02-11 12:00 |
07:45:33.78 |
-29:58:59.2 |
HIP 37872 |
3.36 |
| 2026-02-12 00:00 |
07:45:28.74 |
-29:58:28.5 |
HIP 37872 |
4.08 |
| 2026-02-12 12:00 |
07:45:23.72 |
-29:57:57.4 |
HIP 37872 |
4.98 |
| 2026-02-13 00:00 |
07:45:18.73 |
-29:57:25.9 |
HIP 37872 |
5.98 |
| 2026-02-13 12:00 |
07:45:13.76 |
-29:56:54.1 |
HIP 37872 |
7.05 |
| 2026-02-14 00:00 |
07:45:08.82 |
-29:56:21.9 |
HIP 37872 |
8.14 |
| 2026-02-14 12:00 |
07:45:03.90 |
-29:55:49.3 |
HIP 37872 |
9.26 |
| 2026-02-15 00:00 |
07:44:59.01 |
-29:55:16.3 |
HIP 37872 |
10.39 |
| 2026-02-15 12:00 |
07:44:54.14 |
-29:54:43.0 |
HIP 37872 |
11.53 |
| 2026-02-16 00:00 |
07:44:49.30 |
-29:54:09.3 |
HIP 37872 |
12.67 |
| 2026-02-16 12:00 |
07:44:44.49 |
-29:53:35.2 |
HIP 37872 |
13.82 |
| 2026-02-17 00:00 |
07:44:39.70 |
-29:53:00.8 |
HIP 37872 |
14.97 |
| 2026-02-17 12:00 |
07:44:34.94 |
-29:52:26.0 |
HIP 37872 |
16.12 |
| 2026-02-18 00:00 |
07:44:30.21 |
-29:51:50.9 |
HIP 37872 |
17.27 |
| 2026-02-18 12:00 |
07:44:25.51 |
-29:51:15.5 |
HIP 37721 |
17.37 |
| 2026-02-19 00:00 |
07:44:20.84 |
-29:50:39.7 |
HIP 37721 |
16.66 |
| 2026-02-19 12:00 |
07:44:16.20 |
-29:50:03.5 |
HIP 37721 |
15.99 |
| 2026-02-20 00:00 |
07:44:11.58 |
-29:49:27.1 |
HIP 37721 |
15.37 |
| 2026-02-20 12:00 |
07:44:07.00 |
-29:48:50.3 |
HIP 37721 |
14.82 |
| 2026-02-21 00:00 |
07:44:02.44 |
-29:48:13.1 |
HIP 37721 |
14.33 |
| 2026-02-21 12:00 |
07:43:57.92 |
-29:47:35.7 |
HIP 37721 |
13.92 |
| 2026-02-22 00:00 |
07:43:53.42 |
-29:46:57.9 |
HIP 37721 |
13.59 |
| 2026-02-22 12:00 |
07:43:48.96 |
-29:46:19.9 |
HIP 37721 |
13.35 |
| 2026-02-23 00:00 |
07:43:44.53 |
-29:45:41.5 |
HIP 37721 |
13.19 |
| 2026-02-23 12:00 |
07:43:40.13 |
-29:45:02.8 |
HIP 37721 |
13.13 |
| 2026-02-24 00:00 |
07:43:35.76 |
-29:44:23.8 |
HIP 37721 |
13.16 |