メタデータ
| 項目 |
値 |
| Designation |
C/2009 F4 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-12-31T20:49:26.964480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:30Z |
| Obs used |
1187 |
| NEO |
- |
| M1 |
5.800 |
| K1 |
7.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-10-20.0000000 |
| e |
1.00181059 |
| q (au) |
5.454873 |
| a (au) |
-3012.758168 |
| i (deg) |
79.347294 |
| Ω (om, deg) |
53.583284 |
| ω (w, deg) |
260.381258 |
| M (ma, deg) |
-0.000434 |
等級
散乱 + 全体線形
$$
M_a = (-0.682 + 5.729\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
-0.682 |
| n |
5.729 |
| gf |
0.914 |
| gb |
-0.944 |
| k |
1.000 |
| δ90 |
7.671 |
| 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 |
03:06:09.72 |
+46:08:09.8 |
HIP 14336 |
18.23 |
| 2026-03-26 12:00 |
03:06:13.69 |
+46:08:06.9 |
HIP 14336 |
18.79 |
| 2026-03-27 00:00 |
03:06:17.70 |
+46:08:04.2 |
HIP 14336 |
19.35 |
| 2026-03-27 12:00 |
03:06:21.74 |
+46:08:01.8 |
HIP 14336 |
19.92 |
| 2026-03-28 00:00 |
03:06:25.81 |
+46:07:59.7 |
HIP 14336 |
20.50 |
| 2026-03-28 12:00 |
03:06:29.90 |
+46:07:57.8 |
HIP 14336 |
21.09 |
| 2026-03-29 00:00 |
03:06:34.03 |
+46:07:56.2 |
HIP 14336 |
21.69 |
| 2026-03-29 12:00 |
03:06:38.19 |
+46:07:54.9 |
HIP 14336 |
22.30 |
| 2026-03-30 00:00 |
03:06:42.37 |
+46:07:53.8 |
HIP 14472 |
22.86 |
| 2026-03-30 12:00 |
03:06:46.59 |
+46:07:53.0 |
HIP 14472 |
22.83 |
| 2026-03-31 00:00 |
03:06:50.83 |
+46:07:52.5 |
HIP 14472 |
22.83 |
| 2026-03-31 12:00 |
03:06:55.10 |
+46:07:52.2 |
HIP 14472 |
22.85 |
| 2026-04-01 00:00 |
03:06:59.40 |
+46:07:52.1 |
HIP 14472 |
22.91 |
| 2026-04-01 12:00 |
03:07:03.73 |
+46:07:52.4 |
HIP 14472 |
22.99 |
| 2026-04-02 00:00 |
03:07:08.09 |
+46:07:52.9 |
HIP 14472 |
23.10 |
| 2026-04-02 12:00 |
03:07:12.47 |
+46:07:53.7 |
HIP 14472 |
23.24 |
| 2026-04-03 00:00 |
03:07:16.87 |
+46:07:54.7 |
HIP 14472 |
23.41 |
| 2026-04-03 12:00 |
03:07:21.31 |
+46:07:56.0 |
HIP 14472 |
23.61 |
| 2026-04-04 00:00 |
03:07:25.77 |
+46:07:57.5 |
HIP 14472 |
23.84 |
| 2026-04-04 12:00 |
03:07:30.26 |
+46:07:59.3 |
HIP 14472 |
24.10 |
| 2026-04-05 00:00 |
03:07:34.77 |
+46:08:01.4 |
HIP 14472 |
24.38 |
| 2026-04-05 12:00 |
03:07:39.30 |
+46:08:03.8 |
HIP 14472 |
24.70 |
| 2026-04-06 00:00 |
03:07:43.87 |
+46:08:06.4 |
HIP 14472 |
25.03 |
| 2026-04-06 12:00 |
03:07:48.45 |
+46:08:09.2 |
HIP 14472 |
25.40 |
| 2026-04-07 00:00 |
03:07:53.06 |
+46:08:12.4 |
HIP 14472 |
25.79 |
| 2026-04-07 12:00 |
03:07:57.70 |
+46:08:15.8 |
HIP 14472 |
26.20 |
| 2026-04-08 00:00 |
03:08:02.35 |
+46:08:19.4 |
HIP 14472 |
26.64 |
| 2026-04-08 12:00 |
03:08:07.04 |
+46:08:23.3 |
HIP 14742 |
26.08 |
| 2026-04-09 00:00 |
03:08:11.74 |
+46:08:27.5 |
HIP 14742 |
25.39 |
| 2026-04-09 12:00 |
03:08:16.47 |
+46:08:32.0 |
HIP 14742 |
24.71 |
| 2026-04-10 00:00 |
03:08:21.22 |
+46:08:36.7 |
HIP 14742 |
24.03 |
| 2026-04-10 12:00 |
03:08:25.99 |
+46:08:41.6 |
HIP 14742 |
23.37 |
| 2026-04-11 00:00 |
03:08:30.78 |
+46:08:46.9 |
HIP 14742 |
22.71 |
| 2026-04-11 12:00 |
03:08:35.60 |
+46:08:52.3 |
HIP 14742 |
22.06 |
| 2026-04-12 00:00 |
03:08:40.43 |
+46:08:58.1 |
HIP 14742 |
21.43 |
| 2026-04-12 12:00 |
03:08:45.29 |
+46:09:04.1 |
HIP 14742 |
20.82 |
| 2026-04-13 00:00 |
03:08:50.17 |
+46:09:10.4 |
HIP 14742 |
20.22 |
| 2026-04-13 12:00 |
03:08:55.06 |
+46:09:16.9 |
HIP 14742 |
19.63 |
| 2026-04-14 00:00 |
03:08:59.98 |
+46:09:23.7 |
HIP 14742 |
19.07 |
| 2026-04-14 12:00 |
03:09:04.92 |
+46:09:30.8 |
HIP 14742 |
18.54 |
| 2026-04-15 00:00 |
03:09:09.87 |
+46:09:38.1 |
HIP 14742 |
18.03 |
| 2026-04-15 12:00 |
03:09:14.85 |
+46:09:45.6 |
HIP 14742 |
17.55 |
| 2026-04-16 00:00 |
03:09:19.84 |
+46:09:53.5 |
HIP 14742 |
17.10 |