C/2009 F2 (McNaught)
メタデータ
| 項目 |
値 |
| Designation |
C/2009 F2 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-11-14T02:40:43.518720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:29Z |
| Obs used |
363 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2010-07-09.0000000 |
| e |
0.98302695 |
| q (au) |
5.875026 |
| a (au) |
346.138419 |
| i (deg) |
59.366975 |
| Ω (om, deg) |
214.055338 |
| ω (w, deg) |
336.344497 |
| M (ma, deg) |
0.036255 |
等級
散乱 + 全体線形
$$
M_a = (9.300 + 2.109\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.300 |
| n |
2.109 |
| gf |
1.000 |
| gb |
-0.969 |
| 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) |
| 2026-02-03 00:00 |
20:46:08.34 |
+39:38:31.8 |
HIP 102519 |
17.94 |
| 2026-02-03 12:00 |
20:46:13.66 |
+39:38:44.4 |
HIP 102519 |
17.48 |
| 2026-02-04 00:00 |
20:46:18.97 |
+39:38:57.3 |
HIP 102519 |
17.08 |
| 2026-02-04 12:00 |
20:46:24.28 |
+39:39:10.7 |
HIP 102519 |
16.72 |
| 2026-02-05 00:00 |
20:46:29.59 |
+39:39:24.4 |
HIP 102519 |
16.41 |
| 2026-02-05 12:00 |
20:46:34.89 |
+39:39:38.6 |
HIP 102519 |
16.16 |
| 2026-02-06 00:00 |
20:46:40.19 |
+39:39:53.1 |
HIP 102519 |
15.97 |
| 2026-02-06 12:00 |
20:46:45.47 |
+39:40:08.0 |
HIP 102519 |
15.84 |
| 2026-02-07 00:00 |
20:46:50.76 |
+39:40:23.4 |
HIP 102519 |
15.77 |
| 2026-02-07 12:00 |
20:46:56.03 |
+39:40:39.1 |
HIP 102519 |
15.76 |
| 2026-02-08 00:00 |
20:47:01.30 |
+39:40:55.2 |
HIP 102519 |
15.82 |
| 2026-02-08 12:00 |
20:47:06.57 |
+39:41:11.6 |
HIP 102519 |
15.93 |
| 2026-02-09 00:00 |
20:47:11.82 |
+39:41:28.5 |
HIP 102519 |
16.11 |
| 2026-02-09 12:00 |
20:47:17.07 |
+39:41:45.7 |
HIP 102519 |
16.35 |
| 2026-02-10 00:00 |
20:47:22.31 |
+39:42:03.4 |
HIP 102519 |
16.64 |
| 2026-02-10 12:00 |
20:47:27.54 |
+39:42:21.4 |
HIP 102519 |
16.99 |
| 2026-02-11 00:00 |
20:47:32.76 |
+39:42:39.8 |
HIP 102519 |
17.39 |
| 2026-02-11 12:00 |
20:47:37.98 |
+39:42:58.6 |
HIP 102731 |
16.52 |
| 2026-02-12 00:00 |
20:47:43.18 |
+39:43:17.7 |
HIP 102731 |
15.47 |
| 2026-02-12 12:00 |
20:47:48.37 |
+39:43:37.3 |
HIP 102731 |
14.42 |
| 2026-02-13 00:00 |
20:47:53.56 |
+39:43:57.2 |
HIP 102731 |
13.37 |
| 2026-02-13 12:00 |
20:47:58.73 |
+39:44:17.4 |
HIP 102731 |
12.32 |
| 2026-02-14 00:00 |
20:48:03.90 |
+39:44:38.1 |
HIP 102731 |
11.27 |
| 2026-02-14 12:00 |
20:48:09.05 |
+39:44:59.1 |
HIP 102731 |
10.23 |
| 2026-02-15 00:00 |
20:48:14.19 |
+39:45:20.5 |
HIP 102731 |
9.18 |
| 2026-02-15 12:00 |
20:48:19.32 |
+39:45:42.3 |
HIP 102731 |
8.14 |
| 2026-02-16 00:00 |
20:48:24.44 |
+39:46:04.4 |
HIP 102731 |
7.10 |
| 2026-02-16 12:00 |
20:48:29.55 |
+39:46:26.9 |
HIP 102731 |
6.07 |
| 2026-02-17 00:00 |
20:48:34.64 |
+39:46:49.8 |
HIP 102731 |
5.04 |
| 2026-02-17 12:00 |
20:48:39.72 |
+39:47:13.0 |
HIP 102731 |
4.03 |
| 2026-02-18 00:00 |
20:48:44.79 |
+39:47:36.6 |
HIP 102731 |
3.05 |
| 2026-02-18 12:00 |
20:48:49.84 |
+39:48:00.5 |
HIP 102731 |
2.14 |
| 2026-02-19 00:00 |
20:48:54.88 |
+39:48:24.8 |
HIP 102731 |
1.44 |
| 2026-02-19 12:00 |
20:48:59.90 |
+39:48:49.5 |
HIP 102731 |
1.33 |
| 2026-02-20 00:00 |
20:49:04.92 |
+39:49:14.5 |
HIP 102731 |
1.93 |
| 2026-02-20 12:00 |
20:49:09.91 |
+39:49:39.8 |
HIP 102731 |
2.80 |
| 2026-02-21 00:00 |
20:49:14.89 |
+39:50:05.5 |
HIP 102731 |
3.77 |
| 2026-02-21 12:00 |
20:49:19.86 |
+39:50:31.5 |
HIP 102731 |
4.77 |
| 2026-02-22 00:00 |
20:49:24.81 |
+39:50:57.9 |
HIP 102731 |
5.79 |
| 2026-02-22 12:00 |
20:49:29.74 |
+39:51:24.7 |
HIP 102731 |
6.82 |
| 2026-02-23 00:00 |
20:49:34.66 |
+39:51:51.7 |
HIP 102731 |
7.85 |
| 2026-02-23 12:00 |
20:49:39.56 |
+39:52:19.1 |
HIP 102731 |
8.89 |
| 2026-02-24 00:00 |
20:49:44.44 |
+39:52:46.9 |
HIP 102731 |
9.93 |