421P/McNaught
メタデータ
| 項目 |
値 |
| Designation |
421P/McNaught |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-09-09T00:24:44.127360Z |
| Orbit solution date (soln_date, UTC) |
2023-04-24T23:44:12Z |
| Obs used |
96 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
13.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2010-11-09.0000000 |
| e |
0.67538400 |
| q (au) |
1.649202 |
| a (au) |
5.080472 |
| i (deg) |
10.094478 |
| Ω (om, deg) |
55.683595 |
| ω (w, deg) |
259.900711 |
| M (ma, deg) |
36.664020 |
等級
散乱 + 全体線形
$$
M_a = (18.570 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.570 |
| n |
2.000 |
| gf |
0.971 |
| gb |
-0.500 |
| k |
0.825 |
| δ90 |
7.163 |
| 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) |
| 2026-02-03 00:00 |
08:57:00.69 |
+28:39:53.7 |
HIP 43882 |
8.28 |
| 2026-02-03 12:00 |
08:56:46.54 |
+28:40:46.6 |
HIP 43882 |
5.22 |
| 2026-02-04 00:00 |
08:56:32.40 |
+28:41:39.0 |
HIP 43882 |
2.59 |
| 2026-02-04 12:00 |
08:56:18.27 |
+28:42:30.9 |
HIP 43882 |
2.64 |
| 2026-02-05 00:00 |
08:56:04.14 |
+28:43:22.1 |
HIP 43882 |
5.27 |
| 2026-02-05 12:00 |
08:55:50.03 |
+28:44:12.9 |
HIP 43882 |
8.32 |
| 2026-02-06 00:00 |
08:55:35.93 |
+28:45:03.0 |
HIP 43882 |
11.44 |
| 2026-02-06 12:00 |
08:55:21.85 |
+28:45:52.6 |
HIP 43882 |
14.60 |
| 2026-02-07 00:00 |
08:55:07.78 |
+28:46:41.6 |
HIP 43882 |
17.76 |
| 2026-02-07 12:00 |
08:54:53.74 |
+28:47:30.0 |
HIP 43882 |
20.92 |
| 2026-02-08 00:00 |
08:54:39.71 |
+28:48:17.8 |
HIP 43628 |
21.25 |
| 2026-02-08 12:00 |
08:54:25.71 |
+28:49:05.0 |
HIP 43628 |
18.63 |
| 2026-02-09 00:00 |
08:54:11.74 |
+28:49:51.6 |
HIP 43628 |
16.21 |
| 2026-02-09 12:00 |
08:53:57.79 |
+28:50:37.6 |
HIP 43628 |
14.08 |
| 2026-02-10 00:00 |
08:53:43.87 |
+28:51:23.0 |
HIP 43628 |
12.39 |
| 2026-02-10 12:00 |
08:53:29.98 |
+28:52:07.8 |
HIP 43628 |
11.34 |
| 2026-02-11 00:00 |
08:53:16.12 |
+28:52:52.0 |
HIP 43628 |
11.09 |
| 2026-02-11 12:00 |
08:53:02.29 |
+28:53:35.5 |
HIP 43628 |
11.69 |
| 2026-02-12 00:00 |
08:52:48.50 |
+28:54:18.4 |
HIP 43628 |
13.02 |
| 2026-02-12 12:00 |
08:52:34.75 |
+28:55:00.7 |
HIP 43551 |
14.10 |
| 2026-02-13 00:00 |
08:52:21.04 |
+28:55:42.3 |
HIP 43551 |
12.57 |
| 2026-02-13 12:00 |
08:52:07.37 |
+28:56:23.3 |
HIP 43551 |
11.68 |
| 2026-02-14 00:00 |
08:51:53.74 |
+28:57:03.6 |
HIP 43551 |
11.56 |
| 2026-02-14 12:00 |
08:51:40.16 |
+28:57:43.3 |
HIP 43551 |
12.23 |
| 2026-02-15 00:00 |
08:51:26.62 |
+28:58:22.4 |
HIP 43551 |
13.57 |
| 2026-02-15 12:00 |
08:51:13.13 |
+28:59:00.7 |
HIP 43551 |
15.39 |
| 2026-02-16 00:00 |
08:50:59.70 |
+28:59:38.5 |
HIP 43551 |
17.54 |
| 2026-02-16 12:00 |
08:50:46.31 |
+29:00:15.5 |
HIP 43551 |
19.91 |
| 2026-02-17 00:00 |
08:50:32.98 |
+29:00:51.9 |
HIP 43274 |
21.10 |
| 2026-02-17 12:00 |
08:50:19.70 |
+29:01:27.6 |
HIP 43274 |
18.29 |
| 2026-02-18 00:00 |
08:50:06.48 |
+29:02:02.6 |
HIP 43274 |
15.54 |
| 2026-02-18 12:00 |
08:49:53.32 |
+29:02:37.0 |
HIP 43274 |
12.89 |
| 2026-02-19 00:00 |
08:49:40.23 |
+29:03:10.7 |
HIP 43274 |
10.41 |
| 2026-02-19 12:00 |
08:49:27.19 |
+29:03:43.7 |
HIP 43274 |
8.21 |
| 2026-02-20 00:00 |
08:49:14.22 |
+29:04:16.0 |
HIP 43274 |
6.59 |
| 2026-02-20 12:00 |
08:49:01.31 |
+29:04:47.6 |
HIP 43274 |
6.01 |
| 2026-02-21 00:00 |
08:48:48.47 |
+29:05:18.5 |
HIP 43274 |
6.70 |
| 2026-02-21 12:00 |
08:48:35.70 |
+29:05:48.8 |
HIP 43274 |
8.35 |
| 2026-02-22 00:00 |
08:48:23.00 |
+29:06:18.3 |
HIP 43274 |
10.50 |
| 2026-02-22 12:00 |
08:48:10.38 |
+29:06:47.2 |
HIP 43145 |
11.90 |
| 2026-02-23 00:00 |
08:47:57.82 |
+29:07:15.3 |
HIP 43145 |
9.17 |
| 2026-02-23 12:00 |
08:47:45.35 |
+29:07:42.8 |
HIP 43145 |
6.51 |
| 2026-02-24 00:00 |
08:47:32.94 |
+29:08:09.6 |
HIP 43145 |
3.99 |