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 |
0.996 |
| gb |
-0.501 |
| k |
1.000 |
| δ90 |
9.999 |
| 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 |
03:33:08.04 |
+32:46:28.0 |
HIP 16676 |
22.99 |
| 2026-07-29 12:00 |
03:33:10.10 |
+32:46:47.6 |
HIP 16676 |
22.45 |
| 2026-07-30 00:00 |
03:33:12.12 |
+32:47:07.2 |
HIP 16676 |
21.91 |
| 2026-07-30 12:00 |
03:33:14.10 |
+32:47:26.7 |
HIP 16676 |
21.38 |
| 2026-07-31 00:00 |
03:33:16.04 |
+32:47:46.1 |
HIP 16676 |
20.86 |
| 2026-07-31 12:00 |
03:33:17.94 |
+32:48:05.4 |
HIP 16676 |
20.35 |
| 2026-08-01 00:00 |
03:33:19.79 |
+32:48:24.7 |
HIP 16676 |
19.85 |
| 2026-08-01 12:00 |
03:33:21.61 |
+32:48:43.9 |
HIP 16676 |
19.35 |
| 2026-08-02 00:00 |
03:33:23.38 |
+32:49:03.0 |
HIP 16676 |
18.86 |
| 2026-08-02 12:00 |
03:33:25.11 |
+32:49:22.0 |
HIP 16676 |
18.38 |
| 2026-08-03 00:00 |
03:33:26.79 |
+32:49:41.0 |
HIP 16676 |
17.91 |
| 2026-08-03 12:00 |
03:33:28.44 |
+32:49:59.8 |
HIP 16676 |
17.45 |
| 2026-08-04 00:00 |
03:33:30.04 |
+32:50:18.6 |
HIP 16676 |
16.99 |
| 2026-08-04 12:00 |
03:33:31.60 |
+32:50:37.3 |
HIP 16676 |
16.54 |
| 2026-08-05 00:00 |
03:33:33.11 |
+32:50:55.8 |
HIP 16676 |
16.11 |
| 2026-08-05 12:00 |
03:33:34.59 |
+32:51:14.3 |
HIP 16676 |
15.68 |
| 2026-08-06 00:00 |
03:33:36.02 |
+32:51:32.7 |
HIP 16676 |
15.26 |
| 2026-08-06 12:00 |
03:33:37.40 |
+32:51:51.1 |
HIP 16676 |
14.84 |
| 2026-08-07 00:00 |
03:33:38.75 |
+32:52:09.3 |
HIP 16676 |
14.44 |
| 2026-08-07 12:00 |
03:33:40.04 |
+32:52:27.4 |
HIP 16676 |
14.05 |
| 2026-08-08 00:00 |
03:33:41.30 |
+32:52:45.4 |
HIP 16676 |
13.66 |
| 2026-08-08 12:00 |
03:33:42.51 |
+32:53:03.3 |
HIP 16676 |
13.29 |
| 2026-08-09 00:00 |
03:33:43.68 |
+32:53:21.2 |
HIP 16676 |
12.93 |
| 2026-08-09 12:00 |
03:33:44.80 |
+32:53:38.9 |
HIP 16676 |
12.57 |
| 2026-08-10 00:00 |
03:33:45.88 |
+32:53:56.5 |
HIP 16676 |
12.23 |
| 2026-08-10 12:00 |
03:33:46.92 |
+32:54:14.0 |
HIP 16676 |
11.89 |
| 2026-08-11 00:00 |
03:33:47.90 |
+32:54:31.4 |
HIP 16676 |
11.57 |
| 2026-08-11 12:00 |
03:33:48.85 |
+32:54:48.7 |
HIP 16676 |
11.26 |
| 2026-08-12 00:00 |
03:33:49.75 |
+32:55:05.9 |
HIP 16676 |
10.96 |
| 2026-08-12 12:00 |
03:33:50.60 |
+32:55:23.0 |
HIP 16676 |
10.67 |
| 2026-08-13 00:00 |
03:33:51.41 |
+32:55:39.9 |
HIP 16676 |
10.40 |
| 2026-08-13 12:00 |
03:33:52.18 |
+32:55:56.8 |
HIP 16676 |
10.14 |
| 2026-08-14 00:00 |
03:33:52.90 |
+32:56:13.5 |
HIP 16676 |
9.89 |
| 2026-08-14 12:00 |
03:33:53.57 |
+32:56:30.1 |
HIP 16676 |
9.65 |
| 2026-08-15 00:00 |
03:33:54.20 |
+32:56:46.6 |
HIP 16676 |
9.43 |
| 2026-08-15 12:00 |
03:33:54.78 |
+32:57:03.0 |
HIP 16676 |
9.22 |
| 2026-08-16 00:00 |
03:33:55.32 |
+32:57:19.3 |
HIP 16676 |
9.03 |
| 2026-08-16 12:00 |
03:33:55.81 |
+32:57:35.4 |
HIP 16676 |
8.85 |
| 2026-08-17 00:00 |
03:33:56.26 |
+32:57:51.4 |
HIP 16676 |
8.69 |
| 2026-08-17 12:00 |
03:33:56.66 |
+32:58:07.3 |
HIP 16676 |
8.55 |
| 2026-08-18 00:00 |
03:33:57.01 |
+32:58:23.1 |
HIP 16676 |
8.42 |
| 2026-08-18 12:00 |
03:33:57.32 |
+32:58:38.7 |
HIP 16676 |
8.31 |
| 2026-08-19 00:00 |
03:33:57.58 |
+32:58:54.2 |
HIP 16676 |
8.21 |