メタデータ
| 項目 |
値 |
| Designation |
C/2015 F2 (Polonia) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-04-28T19:46:02.029440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:09Z |
| Obs used |
308 |
| NEO |
- |
| M1 |
14.900 |
| K1 |
21.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-05-14.0000000 |
| e |
0.96844230 |
| q (au) |
1.210552 |
| a (au) |
38.359944 |
| i (deg) |
28.693745 |
| Ω (om, deg) |
262.551624 |
| ω (w, deg) |
352.034051 |
| M (ma, deg) |
0.062959 |
等級
散乱 + 全体線形
$$
M_a = (15.056 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.056 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.502 |
| 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 |
03:13:53.95 |
+31:41:10.1 |
HIP 15226 |
33.71 |
| 2026-03-26 12:00 |
03:13:58.01 |
+31:41:09.9 |
HIP 15226 |
32.94 |
| 2026-03-27 00:00 |
03:14:02.11 |
+31:41:09.9 |
HIP 15226 |
32.16 |
| 2026-03-27 12:00 |
03:14:06.24 |
+31:41:10.1 |
HIP 15226 |
31.37 |
| 2026-03-28 00:00 |
03:14:10.39 |
+31:41:10.5 |
HIP 15226 |
30.59 |
| 2026-03-28 12:00 |
03:14:14.57 |
+31:41:11.0 |
HIP 15226 |
29.80 |
| 2026-03-29 00:00 |
03:14:18.79 |
+31:41:11.8 |
HIP 15226 |
29.02 |
| 2026-03-29 12:00 |
03:14:23.03 |
+31:41:12.8 |
HIP 15226 |
28.23 |
| 2026-03-30 00:00 |
03:14:27.30 |
+31:41:14.0 |
HIP 15226 |
27.44 |
| 2026-03-30 12:00 |
03:14:31.60 |
+31:41:15.4 |
HIP 15226 |
26.65 |
| 2026-03-31 00:00 |
03:14:35.92 |
+31:41:17.0 |
HIP 15226 |
25.87 |
| 2026-03-31 12:00 |
03:14:40.27 |
+31:41:18.8 |
HIP 15226 |
25.08 |
| 2026-04-01 00:00 |
03:14:44.65 |
+31:41:20.8 |
HIP 15226 |
24.30 |
| 2026-04-01 12:00 |
03:14:49.06 |
+31:41:23.0 |
HIP 15226 |
23.53 |
| 2026-04-02 00:00 |
03:14:53.49 |
+31:41:25.4 |
HIP 15226 |
22.76 |
| 2026-04-02 12:00 |
03:14:57.95 |
+31:41:28.0 |
HIP 15226 |
22.00 |
| 2026-04-03 00:00 |
03:15:02.43 |
+31:41:30.8 |
HIP 15226 |
21.24 |
| 2026-04-03 12:00 |
03:15:06.94 |
+31:41:33.7 |
HIP 15226 |
20.50 |
| 2026-04-04 00:00 |
03:15:11.48 |
+31:41:36.9 |
HIP 15226 |
19.77 |
| 2026-04-04 12:00 |
03:15:16.04 |
+31:41:40.3 |
HIP 15226 |
19.05 |
| 2026-04-05 00:00 |
03:15:20.62 |
+31:41:43.8 |
HIP 15226 |
18.36 |
| 2026-04-05 12:00 |
03:15:25.23 |
+31:41:47.6 |
HIP 15226 |
17.68 |
| 2026-04-06 00:00 |
03:15:29.87 |
+31:41:51.5 |
HIP 15226 |
17.02 |
| 2026-04-06 12:00 |
03:15:34.53 |
+31:41:55.7 |
HIP 15226 |
16.40 |
| 2026-04-07 00:00 |
03:15:39.21 |
+31:42:00.0 |
HIP 15226 |
15.80 |
| 2026-04-07 12:00 |
03:15:43.91 |
+31:42:04.5 |
HIP 15226 |
15.25 |
| 2026-04-08 00:00 |
03:15:48.64 |
+31:42:09.2 |
HIP 15226 |
14.73 |
| 2026-04-08 12:00 |
03:15:53.39 |
+31:42:14.1 |
HIP 15226 |
14.27 |
| 2026-04-09 00:00 |
03:15:58.16 |
+31:42:19.2 |
HIP 15226 |
13.85 |
| 2026-04-09 12:00 |
03:16:02.96 |
+31:42:24.5 |
HIP 15226 |
13.50 |
| 2026-04-10 00:00 |
03:16:07.78 |
+31:42:29.9 |
HIP 15226 |
13.22 |
| 2026-04-10 12:00 |
03:16:12.62 |
+31:42:35.6 |
HIP 15226 |
13.00 |
| 2026-04-11 00:00 |
03:16:17.48 |
+31:42:41.4 |
HIP 15226 |
12.86 |
| 2026-04-11 12:00 |
03:16:22.36 |
+31:42:47.4 |
HIP 15226 |
12.81 |
| 2026-04-12 00:00 |
03:16:27.26 |
+31:42:53.6 |
HIP 15226 |
12.83 |
| 2026-04-12 12:00 |
03:16:32.18 |
+31:43:00.0 |
HIP 15226 |
12.94 |
| 2026-04-13 00:00 |
03:16:37.13 |
+31:43:06.6 |
HIP 15226 |
13.13 |
| 2026-04-13 12:00 |
03:16:42.09 |
+31:43:13.3 |
HIP 15226 |
13.40 |
| 2026-04-14 00:00 |
03:16:47.07 |
+31:43:20.3 |
HIP 15226 |
13.74 |
| 2026-04-14 12:00 |
03:16:52.07 |
+31:43:27.4 |
HIP 15226 |
14.16 |
| 2026-04-15 00:00 |
03:16:57.09 |
+31:43:34.7 |
HIP 15226 |
14.64 |
| 2026-04-15 12:00 |
03:17:02.13 |
+31:43:42.1 |
HIP 15226 |
15.18 |
| 2026-04-16 00:00 |
03:17:07.18 |
+31:43:49.8 |
HIP 15226 |
15.78 |