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) |
| 2026-06-01 00:00 |
18:40:58.22 |
+64:27:08.0 |
HIP 91950 |
31.64 |
| 2026-06-01 12:00 |
18:40:51.72 |
+64:27:34.5 |
HIP 91950 |
31.86 |
| 2026-06-02 00:00 |
18:40:45.18 |
+64:28:00.7 |
HIP 91950 |
32.11 |
| 2026-06-02 12:00 |
18:40:38.61 |
+64:28:26.4 |
HIP 91950 |
32.38 |
| 2026-06-03 00:00 |
18:40:32.00 |
+64:28:51.7 |
HIP 91950 |
32.68 |
| 2026-06-03 12:00 |
18:40:25.36 |
+64:29:16.6 |
HIP 91950 |
33.00 |
| 2026-06-04 00:00 |
18:40:18.69 |
+64:29:41.1 |
HIP 91950 |
33.34 |
| 2026-06-04 12:00 |
18:40:11.98 |
+64:30:05.2 |
HIP 91950 |
33.71 |
| 2026-06-05 00:00 |
18:40:05.25 |
+64:30:28.8 |
HIP 91950 |
34.10 |
| 2026-06-05 12:00 |
18:39:58.48 |
+64:30:52.1 |
HIP 91950 |
34.52 |
| 2026-06-06 00:00 |
18:39:51.67 |
+64:31:15.0 |
HIP 91950 |
34.95 |
| 2026-06-06 12:00 |
18:39:44.84 |
+64:31:37.4 |
HIP 91950 |
35.40 |
| 2026-06-07 00:00 |
18:39:37.98 |
+64:31:59.4 |
HIP 91950 |
35.87 |
| 2026-06-07 12:00 |
18:39:31.09 |
+64:32:21.0 |
HIP 91950 |
36.36 |
| 2026-06-08 00:00 |
18:39:24.17 |
+64:32:42.1 |
HIP 91950 |
36.87 |
| 2026-06-08 12:00 |
18:39:17.22 |
+64:33:02.9 |
HIP 91190 |
37.19 |
| 2026-06-09 00:00 |
18:39:10.25 |
+64:33:23.2 |
HIP 91190 |
36.51 |
| 2026-06-09 12:00 |
18:39:03.24 |
+64:33:43.1 |
HIP 91190 |
35.84 |
| 2026-06-10 00:00 |
18:38:56.21 |
+64:34:02.5 |
HIP 91190 |
35.18 |
| 2026-06-10 12:00 |
18:38:49.16 |
+64:34:21.6 |
HIP 91190 |
34.53 |
| 2026-06-11 00:00 |
18:38:42.08 |
+64:34:40.2 |
HIP 91190 |
33.90 |
| 2026-06-11 12:00 |
18:38:34.97 |
+64:34:58.3 |
HIP 91190 |
33.28 |
| 2026-06-12 00:00 |
18:38:27.84 |
+64:35:16.0 |
HIP 91190 |
32.67 |
| 2026-06-12 12:00 |
18:38:20.69 |
+64:35:33.3 |
HIP 91190 |
32.07 |
| 2026-06-13 00:00 |
18:38:13.51 |
+64:35:50.2 |
HIP 91190 |
31.50 |
| 2026-06-13 12:00 |
18:38:06.31 |
+64:36:06.6 |
HIP 91190 |
30.94 |
| 2026-06-14 00:00 |
18:37:59.09 |
+64:36:22.5 |
HIP 91190 |
30.39 |
| 2026-06-14 12:00 |
18:37:51.85 |
+64:36:38.0 |
HIP 91190 |
29.87 |
| 2026-06-15 00:00 |
18:37:44.59 |
+64:36:53.1 |
HIP 91190 |
29.36 |
| 2026-06-15 12:00 |
18:37:37.31 |
+64:37:07.7 |
HIP 91190 |
28.88 |
| 2026-06-16 00:00 |
18:37:30.01 |
+64:37:21.9 |
HIP 91190 |
28.41 |
| 2026-06-16 12:00 |
18:37:22.70 |
+64:37:35.7 |
HIP 91190 |
27.97 |
| 2026-06-17 00:00 |
18:37:15.36 |
+64:37:48.9 |
HIP 91190 |
27.55 |
| 2026-06-17 12:00 |
18:37:08.01 |
+64:38:01.8 |
HIP 91190 |
27.16 |
| 2026-06-18 00:00 |
18:37:00.65 |
+64:38:14.2 |
HIP 91190 |
26.79 |
| 2026-06-18 12:00 |
18:36:53.27 |
+64:38:26.1 |
HIP 91190 |
26.45 |
| 2026-06-19 00:00 |
18:36:45.87 |
+64:38:37.6 |
HIP 91190 |
26.14 |
| 2026-06-19 12:00 |
18:36:38.46 |
+64:38:48.6 |
HIP 91190 |
25.86 |
| 2026-06-20 00:00 |
18:36:31.04 |
+64:38:59.2 |
HIP 91190 |
25.60 |
| 2026-06-20 12:00 |
18:36:23.60 |
+64:39:09.3 |
HIP 91190 |
25.38 |
| 2026-06-21 00:00 |
18:36:16.15 |
+64:39:19.0 |
HIP 91190 |
25.19 |
| 2026-06-21 12:00 |
18:36:08.69 |
+64:39:28.2 |
HIP 91190 |
25.03 |
| 2026-06-22 00:00 |
18:36:01.22 |
+64:39:36.9 |
HIP 91190 |
24.90 |