338P/McNaught
メタデータ
| 項目 |
値 |
| Designation |
338P/McNaught |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-11-21T23:54:59.846400Z |
| Orbit solution date (soln_date, UTC) |
2025-02-13T09:13:12Z |
| Obs used |
882 |
| NEO |
- |
| M1 |
15.500 |
| 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) |
2018-02-14.0000000 |
| e |
0.41033494 |
| q (au) |
2.301407 |
| a (au) |
3.902905 |
| i (deg) |
25.350404 |
| Ω (om, deg) |
9.805290 |
| ω (w, deg) |
4.508283 |
| M (ma, deg) |
57.394693 |
等級
散乱 + 全体線形
$$
M_a = (11.884 + 5.283\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.884 |
| n |
5.283 |
| gf |
0.999 |
| gb |
-0.937 |
| k |
1.000 |
| δ90 |
9.997 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
09:54:14.43 |
+42:24:31.9 |
HIP 48695 |
23.21 |
| 2026-02-03 12:00 |
09:53:44.41 |
+42:25:35.4 |
HIP 48408 |
19.10 |
| 2026-02-04 00:00 |
09:53:14.33 |
+42:26:36.2 |
HIP 48408 |
13.66 |
| 2026-02-04 12:00 |
09:52:44.17 |
+42:27:34.4 |
HIP 48408 |
8.51 |
| 2026-02-05 00:00 |
09:52:13.95 |
+42:28:29.9 |
HIP 48408 |
4.72 |
| 2026-02-05 12:00 |
09:51:43.67 |
+42:29:22.7 |
HIP 48408 |
6.03 |
| 2026-02-06 00:00 |
09:51:13.34 |
+42:30:12.8 |
HIP 48408 |
10.71 |
| 2026-02-06 12:00 |
09:50:42.97 |
+42:31:00.2 |
HIP 48304 |
14.78 |
| 2026-02-07 00:00 |
09:50:12.56 |
+42:31:44.8 |
HIP 48304 |
17.11 |
| 2026-02-07 12:00 |
09:49:42.12 |
+42:32:26.6 |
HIP 48304 |
20.72 |
| 2026-02-08 00:00 |
09:49:11.66 |
+42:33:05.7 |
HIP 48304 |
25.08 |
| 2026-02-08 12:00 |
09:48:41.18 |
+42:33:42.0 |
HIP 47998 |
21.02 |
| 2026-02-09 00:00 |
09:48:10.69 |
+42:34:15.4 |
HIP 47998 |
16.77 |
| 2026-02-09 12:00 |
09:47:40.19 |
+42:34:46.0 |
HIP 47998 |
13.54 |
| 2026-02-10 00:00 |
09:47:09.70 |
+42:35:13.8 |
HIP 47998 |
12.16 |
| 2026-02-10 12:00 |
09:46:39.23 |
+42:35:38.8 |
HIP 47998 |
13.23 |
| 2026-02-11 00:00 |
09:46:08.76 |
+42:36:00.8 |
HIP 47998 |
16.26 |
| 2026-02-11 12:00 |
09:45:38.32 |
+42:36:20.0 |
HIP 47998 |
20.38 |
| 2026-02-12 00:00 |
09:45:07.92 |
+42:36:36.4 |
HIP 47690 |
19.46 |
| 2026-02-12 12:00 |
09:44:37.55 |
+42:36:49.8 |
HIP 47690 |
14.06 |
| 2026-02-13 00:00 |
09:44:07.22 |
+42:37:00.4 |
HIP 47690 |
8.93 |
| 2026-02-13 12:00 |
09:43:36.94 |
+42:37:08.1 |
HIP 47690 |
4.94 |
| 2026-02-14 00:00 |
09:43:06.73 |
+42:37:12.8 |
HIP 47690 |
5.61 |
| 2026-02-14 12:00 |
09:42:36.57 |
+42:37:14.7 |
HIP 47690 |
10.02 |
| 2026-02-15 00:00 |
09:42:06.49 |
+42:37:13.7 |
HIP 47514 |
10.45 |
| 2026-02-15 12:00 |
09:41:36.49 |
+42:37:09.7 |
HIP 47514 |
5.18 |
| 2026-02-16 00:00 |
09:41:06.57 |
+42:37:02.9 |
HIP 47514 |
2.27 |
| 2026-02-16 12:00 |
09:40:36.74 |
+42:36:53.1 |
HIP 47514 |
6.62 |
| 2026-02-17 00:00 |
09:40:07.01 |
+42:36:40.4 |
HIP 47514 |
11.92 |
| 2026-02-17 12:00 |
09:39:37.39 |
+42:36:24.8 |
HIP 47514 |
17.31 |
| 2026-02-18 00:00 |
09:39:07.87 |
+42:36:06.4 |
HIP 47399 |
19.29 |
| 2026-02-18 12:00 |
09:38:38.47 |
+42:35:45.0 |
HIP 47399 |
20.67 |
| 2026-02-19 00:00 |
09:38:09.20 |
+42:35:20.7 |
HIP 47399 |
23.22 |
| 2026-02-19 12:00 |
09:37:40.06 |
+42:34:53.5 |
HIP 47399 |
26.59 |
| 2026-02-20 00:00 |
09:37:11.05 |
+42:34:23.5 |
HIP 47124 |
26.22 |
| 2026-02-20 12:00 |
09:36:42.19 |
+42:33:50.5 |
HIP 47101 |
24.34 |
| 2026-02-21 00:00 |
09:36:13.47 |
+42:33:14.8 |
HIP 47101 |
22.56 |
| 2026-02-21 12:00 |
09:35:44.91 |
+42:32:36.1 |
HIP 46930 |
20.56 |
| 2026-02-22 00:00 |
09:35:16.51 |
+42:31:54.6 |
HIP 46930 |
15.29 |
| 2026-02-22 12:00 |
09:34:48.28 |
+42:31:10.3 |
HIP 46930 |
10.04 |
| 2026-02-23 00:00 |
09:34:20.21 |
+42:30:23.2 |
HIP 46930 |
4.85 |
| 2026-02-23 12:00 |
09:33:52.33 |
+42:29:33.3 |
HIP 46930 |
0.95 |
| 2026-02-24 00:00 |
09:33:24.63 |
+42:28:40.6 |
HIP 46930 |
5.69 |