メタデータ
| 項目 |
値 |
| Designation |
446P/McNaught |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-08-14T16:28:43.587840Z |
| Orbit solution date (soln_date, UTC) |
2024-07-13T19:12:22Z |
| Obs used |
396 |
| NEO |
- |
| M1 |
17.500 |
| K1 |
6.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-01-08.0000000 |
| e |
0.64668523 |
| q (au) |
1.618504 |
| a (au) |
4.580911 |
| i (deg) |
16.571891 |
| Ω (om, deg) |
336.425077 |
| ω (w, deg) |
344.682612 |
| M (ma, deg) |
88.091854 |
等級
散乱 + 全体線形
$$
M_a = (17.429 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.429 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.849 |
| k |
0.999 |
| 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 |
08:41:06.80 |
+24:52:34.6 |
HIP 42703 |
17.43 |
| 2026-06-01 12:00 |
08:41:18.47 |
+24:51:17.9 |
HIP 42703 |
16.19 |
| 2026-06-02 00:00 |
08:41:30.22 |
+24:50:01.1 |
HIP 42703 |
15.40 |
| 2026-06-02 12:00 |
08:41:42.06 |
+24:48:44.1 |
HIP 42703 |
15.15 |
| 2026-06-03 00:00 |
08:41:53.99 |
+24:47:26.8 |
HIP 42703 |
15.48 |
| 2026-06-03 12:00 |
08:42:06.00 |
+24:46:09.4 |
HIP 42703 |
16.36 |
| 2026-06-04 00:00 |
08:42:18.09 |
+24:44:51.8 |
HIP 42724 |
17.69 |
| 2026-06-04 12:00 |
08:42:30.26 |
+24:43:34.0 |
HIP 42724 |
18.95 |
| 2026-06-05 00:00 |
08:42:42.52 |
+24:42:16.0 |
HIP 42724 |
20.59 |
| 2026-06-05 12:00 |
08:42:54.85 |
+24:40:57.8 |
HIP 42887 |
21.54 |
| 2026-06-06 00:00 |
08:43:07.27 |
+24:39:39.4 |
HIP 42887 |
19.41 |
| 2026-06-06 12:00 |
08:43:19.77 |
+24:38:20.9 |
HIP 42887 |
17.55 |
| 2026-06-07 00:00 |
08:43:32.34 |
+24:37:02.1 |
HIP 42887 |
16.08 |
| 2026-06-07 12:00 |
08:43:45.00 |
+24:35:43.2 |
HIP 42887 |
15.12 |
| 2026-06-08 00:00 |
08:43:57.73 |
+24:34:24.0 |
HIP 42887 |
14.78 |
| 2026-06-08 12:00 |
08:44:10.54 |
+24:33:04.7 |
HIP 42887 |
15.12 |
| 2026-06-09 00:00 |
08:44:23.43 |
+24:31:45.2 |
HIP 42887 |
16.10 |
| 2026-06-09 12:00 |
08:44:36.39 |
+24:30:25.6 |
HIP 42887 |
17.62 |
| 2026-06-10 00:00 |
08:44:49.43 |
+24:29:05.7 |
HIP 42887 |
19.57 |
| 2026-06-10 12:00 |
08:45:02.54 |
+24:27:45.7 |
HIP 42887 |
21.84 |
| 2026-06-11 00:00 |
08:45:15.73 |
+24:26:25.5 |
HIP 42887 |
24.35 |
| 2026-06-11 12:00 |
08:45:28.99 |
+24:25:05.1 |
HIP 42887 |
27.04 |
| 2026-06-12 00:00 |
08:45:42.32 |
+24:23:44.6 |
HIP 42887 |
29.86 |
| 2026-06-12 12:00 |
08:45:55.72 |
+24:22:23.9 |
HIP 43053 |
31.17 |
| 2026-06-13 00:00 |
08:46:09.19 |
+24:21:03.0 |
HIP 43053 |
29.50 |
| 2026-06-13 12:00 |
08:46:22.74 |
+24:19:41.9 |
HIP 43053 |
28.13 |
| 2026-06-14 00:00 |
08:46:36.35 |
+24:18:20.7 |
HIP 43053 |
27.11 |
| 2026-06-14 12:00 |
08:46:50.03 |
+24:16:59.3 |
HIP 43242 |
25.72 |
| 2026-06-15 00:00 |
08:47:03.78 |
+24:15:37.8 |
HIP 43242 |
22.31 |
| 2026-06-15 12:00 |
08:47:17.60 |
+24:14:16.1 |
HIP 43242 |
18.88 |
| 2026-06-16 00:00 |
08:47:31.48 |
+24:12:54.3 |
HIP 43242 |
15.44 |
| 2026-06-16 12:00 |
08:47:45.43 |
+24:11:32.2 |
HIP 43242 |
11.99 |
| 2026-06-17 00:00 |
08:47:59.44 |
+24:10:10.1 |
HIP 43242 |
8.53 |
| 2026-06-17 12:00 |
08:48:13.52 |
+24:08:47.8 |
HIP 43242 |
5.08 |
| 2026-06-18 00:00 |
08:48:27.66 |
+24:07:25.3 |
HIP 43242 |
1.76 |
| 2026-06-18 12:00 |
08:48:41.86 |
+24:06:02.7 |
HIP 43242 |
2.25 |
| 2026-06-19 00:00 |
08:48:56.12 |
+24:04:40.0 |
HIP 43242 |
5.66 |
| 2026-06-19 12:00 |
08:49:10.44 |
+24:03:17.1 |
HIP 43242 |
9.17 |
| 2026-06-20 00:00 |
08:49:24.82 |
+24:01:54.1 |
HIP 43242 |
12.72 |
| 2026-06-20 12:00 |
08:49:39.27 |
+24:00:30.9 |
HIP 43242 |
16.29 |
| 2026-06-21 00:00 |
08:49:53.76 |
+23:59:07.6 |
HIP 43242 |
19.87 |
| 2026-06-21 12:00 |
08:50:08.32 |
+23:57:44.2 |
HIP 43242 |
23.47 |
| 2026-06-22 00:00 |
08:50:22.93 |
+23:56:20.7 |
HIP 43242 |
27.09 |