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) |
| 2026-06-01 00:00 |
20:55:53.38 |
+42:12:22.0 |
HIP 103269 |
8.86 |
| 2026-06-01 12:00 |
20:55:51.60 |
+42:13:00.8 |
HIP 103269 |
8.20 |
| 2026-06-02 00:00 |
20:55:49.78 |
+42:13:39.4 |
HIP 103269 |
7.54 |
| 2026-06-02 12:00 |
20:55:47.93 |
+42:14:17.6 |
HIP 103269 |
6.90 |
| 2026-06-03 00:00 |
20:55:46.04 |
+42:14:55.6 |
HIP 103269 |
6.27 |
| 2026-06-03 12:00 |
20:55:44.12 |
+42:15:33.4 |
HIP 103269 |
5.66 |
| 2026-06-04 00:00 |
20:55:42.15 |
+42:16:10.9 |
HIP 103269 |
5.07 |
| 2026-06-04 12:00 |
20:55:40.16 |
+42:16:48.1 |
HIP 103269 |
4.52 |
| 2026-06-05 00:00 |
20:55:38.12 |
+42:17:25.1 |
HIP 103269 |
4.01 |
| 2026-06-05 12:00 |
20:55:36.05 |
+42:18:01.8 |
HIP 103269 |
3.58 |
| 2026-06-06 00:00 |
20:55:33.95 |
+42:18:38.2 |
HIP 103269 |
3.24 |
| 2026-06-06 12:00 |
20:55:31.81 |
+42:19:14.4 |
HIP 103269 |
3.03 |
| 2026-06-07 00:00 |
20:55:29.63 |
+42:19:50.2 |
HIP 103269 |
2.97 |
| 2026-06-07 12:00 |
20:55:27.42 |
+42:20:25.8 |
HIP 103269 |
3.08 |
| 2026-06-08 00:00 |
20:55:25.18 |
+42:21:01.1 |
HIP 103269 |
3.34 |
| 2026-06-08 12:00 |
20:55:22.90 |
+42:21:36.2 |
HIP 103269 |
3.71 |
| 2026-06-09 00:00 |
20:55:20.58 |
+42:22:10.9 |
HIP 103269 |
4.17 |
| 2026-06-09 12:00 |
20:55:18.23 |
+42:22:45.3 |
HIP 103269 |
4.70 |
| 2026-06-10 00:00 |
20:55:15.85 |
+42:23:19.5 |
HIP 103269 |
5.26 |
| 2026-06-10 12:00 |
20:55:13.43 |
+42:23:53.3 |
HIP 103269 |
5.85 |
| 2026-06-11 00:00 |
20:55:10.98 |
+42:24:26.8 |
HIP 103269 |
6.47 |
| 2026-06-11 12:00 |
20:55:08.49 |
+42:25:00.1 |
HIP 103272 |
6.06 |
| 2026-06-12 00:00 |
20:55:05.97 |
+42:25:33.0 |
HIP 103272 |
5.70 |
| 2026-06-12 12:00 |
20:55:03.42 |
+42:26:05.6 |
HIP 103272 |
5.42 |
| 2026-06-13 00:00 |
20:55:00.83 |
+42:26:37.9 |
HIP 103272 |
5.24 |
| 2026-06-13 12:00 |
20:54:58.22 |
+42:27:09.9 |
HIP 103272 |
5.15 |
| 2026-06-14 00:00 |
20:54:55.56 |
+42:27:41.6 |
HIP 103272 |
5.17 |
| 2026-06-14 12:00 |
20:54:52.88 |
+42:28:12.9 |
HIP 103272 |
5.30 |
| 2026-06-15 00:00 |
20:54:50.16 |
+42:28:44.0 |
HIP 103272 |
5.53 |
| 2026-06-15 12:00 |
20:54:47.42 |
+42:29:14.7 |
HIP 103272 |
5.84 |
| 2026-06-16 00:00 |
20:54:44.64 |
+42:29:45.0 |
HIP 103272 |
6.23 |
| 2026-06-16 12:00 |
20:54:41.83 |
+42:30:15.1 |
HIP 103272 |
6.68 |
| 2026-06-17 00:00 |
20:54:38.98 |
+42:30:44.8 |
HIP 103272 |
7.18 |
| 2026-06-17 12:00 |
20:54:36.11 |
+42:31:14.1 |
HIP 103272 |
7.72 |
| 2026-06-18 00:00 |
20:54:33.21 |
+42:31:43.2 |
HIP 103272 |
8.30 |
| 2026-06-18 12:00 |
20:54:30.27 |
+42:32:11.9 |
HIP 103272 |
8.89 |
| 2026-06-19 00:00 |
20:54:27.31 |
+42:32:40.2 |
HIP 103272 |
9.51 |
| 2026-06-19 12:00 |
20:54:24.32 |
+42:33:08.2 |
HIP 103272 |
10.15 |
| 2026-06-20 00:00 |
20:54:21.29 |
+42:33:35.9 |
HIP 103272 |
10.80 |
| 2026-06-20 12:00 |
20:54:18.24 |
+42:34:03.2 |
HIP 103272 |
11.47 |
| 2026-06-21 00:00 |
20:54:15.16 |
+42:34:30.1 |
HIP 103272 |
12.14 |
| 2026-06-21 12:00 |
20:54:12.05 |
+42:34:56.7 |
HIP 103272 |
12.82 |
| 2026-06-22 00:00 |
20:54:08.91 |
+42:35:23.0 |
HIP 103108 |
13.32 |