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) |
| 2026-03-26 00:00 |
20:53:56.64 |
+40:29:17.2 |
HIP 103084 |
12.64 |
| 2026-03-26 12:00 |
20:54:00.00 |
+40:30:00.9 |
HIP 103189 |
12.87 |
| 2026-03-27 00:00 |
20:54:03.33 |
+40:30:44.8 |
HIP 103189 |
11.98 |
| 2026-03-27 12:00 |
20:54:06.63 |
+40:31:28.8 |
HIP 103189 |
11.10 |
| 2026-03-28 00:00 |
20:54:09.90 |
+40:32:13.0 |
HIP 103189 |
10.23 |
| 2026-03-28 12:00 |
20:54:13.13 |
+40:32:57.4 |
HIP 103189 |
9.38 |
| 2026-03-29 00:00 |
20:54:16.33 |
+40:33:42.0 |
HIP 103189 |
8.55 |
| 2026-03-29 12:00 |
20:54:19.50 |
+40:34:26.7 |
HIP 103189 |
7.75 |
| 2026-03-30 00:00 |
20:54:22.64 |
+40:35:11.5 |
HIP 103189 |
6.99 |
| 2026-03-30 12:00 |
20:54:25.74 |
+40:35:56.5 |
HIP 103189 |
6.27 |
| 2026-03-31 00:00 |
20:54:28.81 |
+40:36:41.7 |
HIP 103189 |
5.62 |
| 2026-03-31 12:00 |
20:54:31.84 |
+40:37:27.0 |
HIP 103189 |
5.06 |
| 2026-04-01 00:00 |
20:54:34.84 |
+40:38:12.5 |
HIP 103189 |
4.63 |
| 2026-04-01 12:00 |
20:54:37.81 |
+40:38:58.1 |
HIP 103189 |
4.36 |
| 2026-04-02 00:00 |
20:54:40.74 |
+40:39:43.9 |
HIP 103189 |
4.28 |
| 2026-04-02 12:00 |
20:54:43.64 |
+40:40:29.7 |
HIP 103189 |
4.39 |
| 2026-04-03 00:00 |
20:54:46.51 |
+40:41:15.8 |
HIP 103189 |
4.69 |
| 2026-04-03 12:00 |
20:54:49.34 |
+40:42:01.9 |
HIP 103189 |
5.14 |
| 2026-04-04 00:00 |
20:54:52.13 |
+40:42:48.2 |
HIP 103189 |
5.70 |
| 2026-04-04 12:00 |
20:54:54.89 |
+40:43:34.6 |
HIP 103189 |
6.34 |
| 2026-04-05 00:00 |
20:54:57.61 |
+40:44:21.2 |
HIP 103189 |
7.05 |
| 2026-04-05 12:00 |
20:55:00.30 |
+40:45:07.8 |
HIP 103189 |
7.79 |
| 2026-04-06 00:00 |
20:55:02.96 |
+40:45:54.6 |
HIP 103189 |
8.57 |
| 2026-04-06 12:00 |
20:55:05.58 |
+40:46:41.5 |
HIP 103189 |
9.37 |
| 2026-04-07 00:00 |
20:55:08.16 |
+40:47:28.5 |
HIP 103189 |
10.18 |
| 2026-04-07 12:00 |
20:55:10.70 |
+40:48:15.6 |
HIP 103189 |
11.01 |
| 2026-04-08 00:00 |
20:55:13.22 |
+40:49:02.8 |
HIP 103189 |
11.85 |
| 2026-04-08 12:00 |
20:55:15.69 |
+40:49:50.1 |
HIP 103189 |
12.69 |
| 2026-04-09 00:00 |
20:55:18.13 |
+40:50:37.5 |
HIP 103189 |
13.54 |
| 2026-04-09 12:00 |
20:55:20.53 |
+40:51:25.0 |
HIP 103189 |
14.39 |
| 2026-04-10 00:00 |
20:55:22.89 |
+40:52:12.6 |
HIP 103163 |
14.94 |
| 2026-04-10 12:00 |
20:55:25.22 |
+40:53:00.3 |
HIP 103163 |
15.30 |
| 2026-04-11 00:00 |
20:55:27.51 |
+40:53:48.1 |
HIP 103163 |
15.70 |
| 2026-04-11 12:00 |
20:55:29.77 |
+40:54:36.0 |
HIP 103163 |
16.13 |
| 2026-04-12 00:00 |
20:55:31.98 |
+40:55:23.9 |
HIP 103163 |
16.59 |
| 2026-04-12 12:00 |
20:55:34.16 |
+40:56:11.9 |
HIP 103163 |
17.08 |
| 2026-04-13 00:00 |
20:55:36.30 |
+40:57:00.0 |
HIP 103163 |
17.59 |
| 2026-04-13 12:00 |
20:55:38.41 |
+40:57:48.2 |
HIP 103163 |
18.13 |
| 2026-04-14 00:00 |
20:55:40.47 |
+40:58:36.4 |
HIP 103163 |
18.69 |
| 2026-04-14 12:00 |
20:55:42.50 |
+40:59:24.7 |
HIP 103163 |
19.27 |
| 2026-04-15 00:00 |
20:55:44.49 |
+41:00:13.1 |
HIP 103413 |
18.93 |
| 2026-04-15 12:00 |
20:55:46.44 |
+41:01:01.5 |
HIP 103413 |
18.21 |
| 2026-04-16 00:00 |
20:55:48.35 |
+41:01:49.9 |
HIP 103413 |
17.50 |