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) |
| 2026-07-29 00:00 |
07:49:18.68 |
-27:14:15.3 |
HIP 38130 |
12.42 |
| 2026-07-29 12:00 |
07:49:22.76 |
-27:14:32.9 |
HIP 38130 |
12.67 |
| 2026-07-30 00:00 |
07:49:26.83 |
-27:14:50.8 |
HIP 38130 |
12.98 |
| 2026-07-30 12:00 |
07:49:30.90 |
-27:15:09.2 |
HIP 38130 |
13.34 |
| 2026-07-31 00:00 |
07:49:34.95 |
-27:15:27.8 |
HIP 38130 |
13.75 |
| 2026-07-31 12:00 |
07:49:39.00 |
-27:15:46.9 |
HIP 38130 |
14.21 |
| 2026-08-01 00:00 |
07:49:43.04 |
-27:16:06.3 |
HIP 38130 |
14.71 |
| 2026-08-01 12:00 |
07:49:47.07 |
-27:16:26.0 |
HIP 38130 |
15.25 |
| 2026-08-02 00:00 |
07:49:51.10 |
-27:16:46.1 |
HIP 38130 |
15.83 |
| 2026-08-02 12:00 |
07:49:55.11 |
-27:17:06.6 |
HIP 38130 |
16.43 |
| 2026-08-03 00:00 |
07:49:59.11 |
-27:17:27.4 |
HIP 38130 |
17.06 |
| 2026-08-03 12:00 |
07:50:03.11 |
-27:17:48.6 |
HIP 38130 |
17.72 |
| 2026-08-04 00:00 |
07:50:07.09 |
-27:18:10.1 |
HIP 38130 |
18.40 |
| 2026-08-04 12:00 |
07:50:11.07 |
-27:18:32.0 |
HIP 38130 |
19.10 |
| 2026-08-05 00:00 |
07:50:15.03 |
-27:18:54.2 |
HIP 38130 |
19.81 |
| 2026-08-05 12:00 |
07:50:18.98 |
-27:19:16.8 |
HIP 38380 |
19.52 |
| 2026-08-06 00:00 |
07:50:22.92 |
-27:19:39.7 |
HIP 38380 |
18.60 |
| 2026-08-06 12:00 |
07:50:26.85 |
-27:20:03.0 |
HIP 38380 |
17.69 |
| 2026-08-07 00:00 |
07:50:30.77 |
-27:20:26.6 |
HIP 38380 |
16.78 |
| 2026-08-07 12:00 |
07:50:34.67 |
-27:20:50.5 |
HIP 38380 |
15.88 |
| 2026-08-08 00:00 |
07:50:38.57 |
-27:21:14.8 |
HIP 38380 |
14.99 |
| 2026-08-08 12:00 |
07:50:42.45 |
-27:21:39.5 |
HIP 38380 |
14.12 |
| 2026-08-09 00:00 |
07:50:46.32 |
-27:22:04.4 |
HIP 38380 |
13.25 |
| 2026-08-09 12:00 |
07:50:50.17 |
-27:22:29.8 |
HIP 38380 |
12.41 |
| 2026-08-10 00:00 |
07:50:54.01 |
-27:22:55.4 |
HIP 38380 |
11.58 |
| 2026-08-10 12:00 |
07:50:57.84 |
-27:23:21.4 |
HIP 38380 |
10.78 |
| 2026-08-11 00:00 |
07:51:01.65 |
-27:23:47.8 |
HIP 38380 |
10.01 |
| 2026-08-11 12:00 |
07:51:05.45 |
-27:24:14.4 |
HIP 38380 |
9.28 |
| 2026-08-12 00:00 |
07:51:09.24 |
-27:24:41.4 |
HIP 38380 |
8.59 |
| 2026-08-12 12:00 |
07:51:13.00 |
-27:25:08.7 |
HIP 38380 |
7.97 |
| 2026-08-13 00:00 |
07:51:16.76 |
-27:25:36.4 |
HIP 38380 |
7.42 |
| 2026-08-13 12:00 |
07:51:20.50 |
-27:26:04.4 |
HIP 38380 |
6.97 |
| 2026-08-14 00:00 |
07:51:24.22 |
-27:26:32.7 |
HIP 38380 |
6.63 |
| 2026-08-14 12:00 |
07:51:27.92 |
-27:27:01.3 |
HIP 38380 |
6.42 |
| 2026-08-15 00:00 |
07:51:31.61 |
-27:27:30.3 |
HIP 38380 |
6.36 |
| 2026-08-15 12:00 |
07:51:35.28 |
-27:27:59.5 |
HIP 38380 |
6.44 |
| 2026-08-16 00:00 |
07:51:38.94 |
-27:28:29.1 |
HIP 38380 |
6.67 |
| 2026-08-16 12:00 |
07:51:42.58 |
-27:28:59.0 |
HIP 38380 |
7.02 |
| 2026-08-17 00:00 |
07:51:46.20 |
-27:29:29.2 |
HIP 38380 |
7.48 |
| 2026-08-17 12:00 |
07:51:49.80 |
-27:29:59.8 |
HIP 38380 |
8.03 |
| 2026-08-18 00:00 |
07:51:53.38 |
-27:30:30.6 |
HIP 38380 |
8.66 |
| 2026-08-18 12:00 |
07:51:56.95 |
-27:31:01.7 |
HIP 38380 |
9.34 |
| 2026-08-19 00:00 |
07:52:00.49 |
-27:31:33.2 |
HIP 38380 |
10.07 |