メタデータ
| 項目 |
値 |
| Designation |
C/2009 F5 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-11-04T19:50:20.624640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:30Z |
| Obs used |
444 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-05-07.0000000 |
| e |
0.97199145 |
| q (au) |
2.245337 |
| a (au) |
80.166145 |
| i (deg) |
84.990355 |
| Ω (om, deg) |
219.064143 |
| ω (w, deg) |
297.366826 |
| M (ma, deg) |
0.251524 |
等級
散乱 + 全体線形
$$
M_a = (14.104 + 2.537\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.104 |
| n |
2.537 |
| gf |
1.000 |
| gb |
-0.637 |
| k |
0.800 |
| 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 |
18:47:29.10 |
+62:46:05.6 |
HIP 91902 |
26.44 |
| 2026-03-26 12:00 |
18:47:30.35 |
+62:46:59.3 |
HIP 91902 |
26.13 |
| 2026-03-27 00:00 |
18:47:31.53 |
+62:47:53.0 |
HIP 91902 |
25.83 |
| 2026-03-27 12:00 |
18:47:32.65 |
+62:48:46.8 |
HIP 91902 |
25.55 |
| 2026-03-28 00:00 |
18:47:33.71 |
+62:49:40.5 |
HIP 91902 |
25.30 |
| 2026-03-28 12:00 |
18:47:34.70 |
+62:50:34.3 |
HIP 91902 |
25.07 |
| 2026-03-29 00:00 |
18:47:35.63 |
+62:51:28.2 |
HIP 91902 |
24.87 |
| 2026-03-29 12:00 |
18:47:36.49 |
+62:52:22.0 |
HIP 92135 |
24.34 |
| 2026-03-30 00:00 |
18:47:37.28 |
+62:53:15.8 |
HIP 92135 |
23.49 |
| 2026-03-30 12:00 |
18:47:38.01 |
+62:54:09.7 |
HIP 92135 |
22.65 |
| 2026-03-31 00:00 |
18:47:38.68 |
+62:55:03.6 |
HIP 92135 |
21.81 |
| 2026-03-31 12:00 |
18:47:39.28 |
+62:55:57.4 |
HIP 92135 |
20.97 |
| 2026-04-01 00:00 |
18:47:39.82 |
+62:56:51.3 |
HIP 92135 |
20.14 |
| 2026-04-01 12:00 |
18:47:40.29 |
+62:57:45.1 |
HIP 92135 |
19.30 |
| 2026-04-02 00:00 |
18:47:40.69 |
+62:58:39.0 |
HIP 92135 |
18.48 |
| 2026-04-02 12:00 |
18:47:41.04 |
+62:59:32.8 |
HIP 92135 |
17.65 |
| 2026-04-03 00:00 |
18:47:41.31 |
+63:00:26.6 |
HIP 92135 |
16.83 |
| 2026-04-03 12:00 |
18:47:41.52 |
+63:01:20.4 |
HIP 92135 |
16.02 |
| 2026-04-04 00:00 |
18:47:41.66 |
+63:02:14.1 |
HIP 92135 |
15.22 |
| 2026-04-04 12:00 |
18:47:41.74 |
+63:03:07.9 |
HIP 92135 |
14.42 |
| 2026-04-05 00:00 |
18:47:41.76 |
+63:04:01.6 |
HIP 92135 |
13.63 |
| 2026-04-05 12:00 |
18:47:41.70 |
+63:04:55.3 |
HIP 92135 |
12.85 |
| 2026-04-06 00:00 |
18:47:41.59 |
+63:05:48.9 |
HIP 92135 |
12.08 |
| 2026-04-06 12:00 |
18:47:41.40 |
+63:06:42.5 |
HIP 92135 |
11.33 |
| 2026-04-07 00:00 |
18:47:41.15 |
+63:07:36.0 |
HIP 92135 |
10.60 |
| 2026-04-07 12:00 |
18:47:40.84 |
+63:08:29.5 |
HIP 92135 |
9.89 |
| 2026-04-08 00:00 |
18:47:40.45 |
+63:09:22.9 |
HIP 92135 |
9.20 |
| 2026-04-08 12:00 |
18:47:40.01 |
+63:10:16.3 |
HIP 92135 |
8.55 |
| 2026-04-09 00:00 |
18:47:39.49 |
+63:11:09.6 |
HIP 92135 |
7.94 |
| 2026-04-09 12:00 |
18:47:38.91 |
+63:12:02.9 |
HIP 92135 |
7.38 |
| 2026-04-10 00:00 |
18:47:38.27 |
+63:12:56.1 |
HIP 92135 |
6.89 |
| 2026-04-10 12:00 |
18:47:37.56 |
+63:13:49.2 |
HIP 92135 |
6.48 |
| 2026-04-11 00:00 |
18:47:36.78 |
+63:14:42.2 |
HIP 92135 |
6.15 |
| 2026-04-11 12:00 |
18:47:35.93 |
+63:15:35.2 |
HIP 92135 |
5.94 |
| 2026-04-12 00:00 |
18:47:35.02 |
+63:16:28.0 |
HIP 92135 |
5.85 |
| 2026-04-12 12:00 |
18:47:34.05 |
+63:17:20.8 |
HIP 92135 |
5.88 |
| 2026-04-13 00:00 |
18:47:33.00 |
+63:18:13.5 |
HIP 92135 |
6.04 |
| 2026-04-13 12:00 |
18:47:31.89 |
+63:19:06.1 |
HIP 92135 |
6.32 |
| 2026-04-14 00:00 |
18:47:30.72 |
+63:19:58.6 |
HIP 92135 |
6.69 |
| 2026-04-14 12:00 |
18:47:29.48 |
+63:20:51.0 |
HIP 92135 |
7.15 |
| 2026-04-15 00:00 |
18:47:28.17 |
+63:21:43.3 |
HIP 92135 |
7.67 |
| 2026-04-15 12:00 |
18:47:26.80 |
+63:22:35.4 |
HIP 92135 |
8.25 |
| 2026-04-16 00:00 |
18:47:25.36 |
+63:23:27.5 |
HIP 92135 |
8.88 |