メタデータ
| 項目 |
値 |
| Designation |
401P/McNaught |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2006-05-07T16:51:22.184640Z |
| Orbit solution date (soln_date, UTC) |
2024-06-03T15:49:51Z |
| Obs used |
268 |
| NEO |
- |
| M1 |
10.700 |
| K1 |
15.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2008-09-19.0000000 |
| e |
0.58200168 |
| q (au) |
2.379587 |
| a (au) |
5.692815 |
| i (deg) |
12.865037 |
| Ω (om, deg) |
0.095844 |
| ω (w, deg) |
310.243129 |
| M (ma, deg) |
62.788339 |
等級
散乱 + 全体線形
$$
M_a = (12.058 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.058 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.588 |
| 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) |
| 2026-07-29 00:00 |
08:49:18.74 |
+27:18:35.3 |
HIP 43430 |
34.90 |
| 2026-07-29 12:00 |
08:49:33.81 |
+27:17:32.8 |
HIP 43430 |
32.25 |
| 2026-07-30 00:00 |
08:49:48.88 |
+27:16:30.4 |
HIP 43430 |
29.76 |
| 2026-07-30 12:00 |
08:50:03.95 |
+27:15:28.2 |
HIP 43430 |
27.51 |
| 2026-07-31 00:00 |
08:50:19.02 |
+27:14:26.0 |
HIP 43430 |
25.55 |
| 2026-07-31 12:00 |
08:50:34.09 |
+27:13:24.0 |
HIP 43430 |
23.94 |
| 2026-08-01 00:00 |
08:50:49.17 |
+27:12:22.1 |
HIP 43430 |
22.77 |
| 2026-08-01 12:00 |
08:51:04.24 |
+27:11:20.4 |
HIP 43430 |
22.10 |
| 2026-08-02 00:00 |
08:51:19.31 |
+27:10:18.8 |
HIP 43430 |
21.98 |
| 2026-08-02 12:00 |
08:51:34.38 |
+27:09:17.3 |
HIP 43430 |
22.42 |
| 2026-08-03 00:00 |
08:51:49.44 |
+27:08:15.9 |
HIP 43430 |
23.38 |
| 2026-08-03 12:00 |
08:52:04.50 |
+27:07:14.7 |
HIP 43430 |
24.81 |
| 2026-08-04 00:00 |
08:52:19.56 |
+27:06:13.6 |
HIP 43670 |
23.15 |
| 2026-08-04 12:00 |
08:52:34.62 |
+27:05:12.6 |
HIP 43670 |
19.75 |
| 2026-08-05 00:00 |
08:52:49.67 |
+27:04:11.8 |
HIP 43670 |
16.39 |
| 2026-08-05 12:00 |
08:53:04.72 |
+27:03:11.1 |
HIP 43670 |
13.11 |
| 2026-08-06 00:00 |
08:53:19.76 |
+27:02:10.6 |
HIP 43670 |
9.98 |
| 2026-08-06 12:00 |
08:53:34.79 |
+27:01:10.2 |
HIP 43670 |
7.21 |
| 2026-08-07 00:00 |
08:53:49.82 |
+27:00:10.0 |
HIP 43670 |
5.37 |
| 2026-08-07 12:00 |
08:54:04.84 |
+26:59:09.9 |
HIP 43729 |
5.23 |
| 2026-08-08 00:00 |
08:54:19.85 |
+26:58:10.0 |
HIP 43729 |
2.76 |
| 2026-08-08 12:00 |
08:54:34.86 |
+26:57:10.2 |
HIP 43729 |
3.49 |
| 2026-08-09 00:00 |
08:54:49.85 |
+26:56:10.6 |
HIP 43729 |
6.41 |
| 2026-08-09 12:00 |
08:55:04.83 |
+26:55:11.1 |
HIP 43729 |
9.71 |
| 2026-08-10 00:00 |
08:55:19.81 |
+26:54:11.9 |
HIP 43729 |
13.11 |
| 2026-08-10 12:00 |
08:55:34.77 |
+26:53:12.8 |
HIP 43729 |
16.53 |
| 2026-08-11 00:00 |
08:55:49.73 |
+26:52:13.8 |
HIP 43729 |
19.98 |
| 2026-08-11 12:00 |
08:56:04.67 |
+26:51:15.0 |
HIP 43729 |
23.43 |
| 2026-08-12 00:00 |
08:56:19.59 |
+26:50:16.5 |
HIP 43729 |
26.88 |
| 2026-08-12 12:00 |
08:56:34.51 |
+26:49:18.1 |
HIP 43865 |
28.16 |
| 2026-08-13 00:00 |
08:56:49.40 |
+26:48:19.8 |
HIP 43865 |
28.06 |
| 2026-08-13 12:00 |
08:57:04.29 |
+26:47:21.8 |
HIP 44061 |
25.16 |
| 2026-08-14 00:00 |
08:57:19.16 |
+26:46:23.9 |
HIP 44061 |
22.22 |
| 2026-08-14 12:00 |
08:57:34.01 |
+26:45:26.3 |
HIP 44061 |
19.45 |
| 2026-08-15 00:00 |
08:57:48.85 |
+26:44:28.8 |
HIP 44061 |
16.94 |
| 2026-08-15 12:00 |
08:58:03.66 |
+26:43:31.6 |
HIP 44061 |
14.82 |
| 2026-08-16 00:00 |
08:58:18.46 |
+26:42:34.5 |
HIP 44061 |
13.27 |
| 2026-08-16 12:00 |
08:58:33.25 |
+26:41:37.6 |
HIP 44061 |
12.51 |
| 2026-08-17 00:00 |
08:58:48.01 |
+26:40:41.0 |
HIP 44061 |
12.66 |
| 2026-08-17 12:00 |
08:59:02.75 |
+26:39:44.5 |
HIP 44061 |
13.71 |
| 2026-08-18 00:00 |
08:59:17.47 |
+26:38:48.3 |
HIP 44061 |
15.46 |
| 2026-08-18 12:00 |
08:59:32.17 |
+26:37:52.2 |
HIP 44180 |
13.14 |
| 2026-08-19 00:00 |
08:59:46.85 |
+26:36:56.4 |
HIP 44180 |
11.15 |