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 |
0.904 |
| 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) |
| 2026-06-01 00:00 |
07:41:51.49 |
-27:23:18.6 |
HIP 37482 |
9.68 |
| 2026-06-01 12:00 |
07:41:54.49 |
-27:22:52.4 |
HIP 37482 |
9.46 |
| 2026-06-02 00:00 |
07:41:57.52 |
-27:22:26.5 |
HIP 37482 |
9.32 |
| 2026-06-02 12:00 |
07:42:00.57 |
-27:22:00.9 |
HIP 37482 |
9.26 |
| 2026-06-03 00:00 |
07:42:03.64 |
-27:21:35.7 |
HIP 37482 |
9.27 |
| 2026-06-03 12:00 |
07:42:06.74 |
-27:21:10.8 |
HIP 37482 |
9.36 |
| 2026-06-04 00:00 |
07:42:09.87 |
-27:20:46.3 |
HIP 37482 |
9.52 |
| 2026-06-04 12:00 |
07:42:13.02 |
-27:20:22.2 |
HIP 37544 |
9.44 |
| 2026-06-05 00:00 |
07:42:16.19 |
-27:19:58.3 |
HIP 37544 |
8.97 |
| 2026-06-05 12:00 |
07:42:19.39 |
-27:19:34.9 |
HIP 37544 |
8.55 |
| 2026-06-06 00:00 |
07:42:22.60 |
-27:19:11.8 |
HIP 37544 |
8.20 |
| 2026-06-06 12:00 |
07:42:25.85 |
-27:18:49.0 |
HIP 37544 |
7.93 |
| 2026-06-07 00:00 |
07:42:29.11 |
-27:18:26.6 |
HIP 37544 |
7.73 |
| 2026-06-07 12:00 |
07:42:32.40 |
-27:18:04.6 |
HIP 37544 |
7.63 |
| 2026-06-08 00:00 |
07:42:35.71 |
-27:17:42.9 |
HIP 37544 |
7.62 |
| 2026-06-08 12:00 |
07:42:39.04 |
-27:17:21.6 |
HIP 37544 |
7.71 |
| 2026-06-09 00:00 |
07:42:42.39 |
-27:17:00.7 |
HIP 37544 |
7.89 |
| 2026-06-09 12:00 |
07:42:45.76 |
-27:16:40.1 |
HIP 37544 |
8.16 |
| 2026-06-10 00:00 |
07:42:49.16 |
-27:16:19.8 |
HIP 37544 |
8.50 |
| 2026-06-10 12:00 |
07:42:52.58 |
-27:16:00.0 |
HIP 37544 |
8.92 |
| 2026-06-11 00:00 |
07:42:56.01 |
-27:15:40.5 |
HIP 37544 |
9.40 |
| 2026-06-11 12:00 |
07:42:59.47 |
-27:15:21.4 |
HIP 37646 |
8.61 |
| 2026-06-12 00:00 |
07:43:02.95 |
-27:15:02.6 |
HIP 37646 |
7.79 |
| 2026-06-12 12:00 |
07:43:06.45 |
-27:14:44.2 |
HIP 37646 |
6.97 |
| 2026-06-13 00:00 |
07:43:09.96 |
-27:14:26.2 |
HIP 37646 |
6.16 |
| 2026-06-13 12:00 |
07:43:13.50 |
-27:14:08.6 |
HIP 37646 |
5.36 |
| 2026-06-14 00:00 |
07:43:17.05 |
-27:13:51.3 |
HIP 37646 |
4.57 |
| 2026-06-14 12:00 |
07:43:20.63 |
-27:13:34.5 |
HIP 37646 |
3.81 |
| 2026-06-15 00:00 |
07:43:24.22 |
-27:13:18.0 |
HIP 37646 |
3.10 |
| 2026-06-15 12:00 |
07:43:27.83 |
-27:13:01.8 |
HIP 37646 |
2.47 |
| 2026-06-16 00:00 |
07:43:31.46 |
-27:12:46.1 |
HIP 37646 |
2.02 |
| 2026-06-16 12:00 |
07:43:35.11 |
-27:12:30.7 |
HIP 37646 |
1.88 |
| 2026-06-17 00:00 |
07:43:38.77 |
-27:12:15.7 |
HIP 37646 |
2.10 |
| 2026-06-17 12:00 |
07:43:42.45 |
-27:12:01.1 |
HIP 37646 |
2.61 |
| 2026-06-18 00:00 |
07:43:46.15 |
-27:11:46.9 |
HIP 37646 |
3.27 |
| 2026-06-18 12:00 |
07:43:49.86 |
-27:11:33.1 |
HIP 37646 |
4.01 |
| 2026-06-19 00:00 |
07:43:53.59 |
-27:11:19.6 |
HIP 37646 |
4.80 |
| 2026-06-19 12:00 |
07:43:57.34 |
-27:11:06.5 |
HIP 37646 |
5.61 |
| 2026-06-20 00:00 |
07:44:01.10 |
-27:10:53.8 |
HIP 37646 |
6.43 |
| 2026-06-20 12:00 |
07:44:04.87 |
-27:10:41.5 |
HIP 37646 |
7.27 |
| 2026-06-21 00:00 |
07:44:08.66 |
-27:10:29.6 |
HIP 37646 |
8.12 |
| 2026-06-21 12:00 |
07:44:12.47 |
-27:10:18.1 |
HIP 37646 |
8.97 |
| 2026-06-22 00:00 |
07:44:16.28 |
-27:10:06.9 |
HIP 37646 |
9.83 |