メタデータ
| 項目 |
値 |
| Designation |
C/2005 L2 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-07-14T12:31:58.244160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:50Z |
| Obs used |
54 |
| NEO |
- |
| M1 |
14.400 |
| 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) |
2005-09-03.0000000 |
| e |
0.99997944 |
| q (au) |
3.193792 |
| a (au) |
155353.269479 |
| i (deg) |
152.764081 |
| Ω (om, deg) |
155.872566 |
| ω (w, deg) |
294.238895 |
| M (ma, deg) |
0.000001 |
等級
散乱 + 全体線形
$$
M_a = (15.144 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.144 |
| n |
2.000 |
| gf |
0.987 |
| gb |
-0.846 |
| k |
0.982 |
| 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 |
04:40:45.38 |
+48:41:50.5 |
HIP 21800 |
3.05 |
| 2026-06-01 12:00 |
04:40:49.42 |
+48:41:55.0 |
HIP 21800 |
2.59 |
| 2026-06-02 00:00 |
04:40:53.45 |
+48:41:59.6 |
HIP 21800 |
2.23 |
| 2026-06-02 12:00 |
04:40:57.48 |
+48:42:04.4 |
HIP 21800 |
2.04 |
| 2026-06-03 00:00 |
04:41:01.52 |
+48:42:09.4 |
HIP 21800 |
2.07 |
| 2026-06-03 12:00 |
04:41:05.55 |
+48:42:14.5 |
HIP 21800 |
2.30 |
| 2026-06-04 00:00 |
04:41:09.59 |
+48:42:19.8 |
HIP 21800 |
2.69 |
| 2026-06-04 12:00 |
04:41:13.62 |
+48:42:25.2 |
HIP 21800 |
3.17 |
| 2026-06-05 00:00 |
04:41:17.65 |
+48:42:30.7 |
HIP 21800 |
3.72 |
| 2026-06-05 12:00 |
04:41:21.68 |
+48:42:36.4 |
HIP 21800 |
4.30 |
| 2026-06-06 00:00 |
04:41:25.71 |
+48:42:42.3 |
HIP 21800 |
4.91 |
| 2026-06-06 12:00 |
04:41:29.73 |
+48:42:48.3 |
HIP 21800 |
5.53 |
| 2026-06-07 00:00 |
04:41:33.75 |
+48:42:54.5 |
HIP 21800 |
6.16 |
| 2026-06-07 12:00 |
04:41:37.78 |
+48:43:00.8 |
HIP 21800 |
6.80 |
| 2026-06-08 00:00 |
04:41:41.79 |
+48:43:07.3 |
HIP 21800 |
7.45 |
| 2026-06-08 12:00 |
04:41:45.81 |
+48:43:13.9 |
HIP 21800 |
8.10 |
| 2026-06-09 00:00 |
04:41:49.82 |
+48:43:20.6 |
HIP 21800 |
8.76 |
| 2026-06-09 12:00 |
04:41:53.83 |
+48:43:27.6 |
HIP 21800 |
9.42 |
| 2026-06-10 00:00 |
04:41:57.84 |
+48:43:34.6 |
HIP 21800 |
10.08 |
| 2026-06-10 12:00 |
04:42:01.84 |
+48:43:41.8 |
HIP 21800 |
10.74 |
| 2026-06-11 00:00 |
04:42:05.83 |
+48:43:49.2 |
HIP 21800 |
11.40 |
| 2026-06-11 12:00 |
04:42:09.82 |
+48:43:56.7 |
HIP 21800 |
12.06 |
| 2026-06-12 00:00 |
04:42:13.81 |
+48:44:04.3 |
HIP 21800 |
12.73 |
| 2026-06-12 12:00 |
04:42:17.79 |
+48:44:12.1 |
HIP 21800 |
13.39 |
| 2026-06-13 00:00 |
04:42:21.77 |
+48:44:20.1 |
HIP 21800 |
14.06 |
| 2026-06-13 12:00 |
04:42:25.74 |
+48:44:28.2 |
HIP 21800 |
14.72 |
| 2026-06-14 00:00 |
04:42:29.70 |
+48:44:36.4 |
HIP 21800 |
15.39 |
| 2026-06-14 12:00 |
04:42:33.66 |
+48:44:44.8 |
HIP 21800 |
16.05 |
| 2026-06-15 00:00 |
04:42:37.61 |
+48:44:53.3 |
HIP 21800 |
16.72 |
| 2026-06-15 12:00 |
04:42:41.55 |
+48:45:01.9 |
HIP 21800 |
17.38 |
| 2026-06-16 00:00 |
04:42:45.49 |
+48:45:10.7 |
HIP 21800 |
18.04 |
| 2026-06-16 12:00 |
04:42:49.42 |
+48:45:19.7 |
HIP 21800 |
18.71 |
| 2026-06-17 00:00 |
04:42:53.34 |
+48:45:28.8 |
HIP 21800 |
19.37 |
| 2026-06-17 12:00 |
04:42:57.25 |
+48:45:38.0 |
HIP 21800 |
20.03 |
| 2026-06-18 00:00 |
04:43:01.16 |
+48:45:47.4 |
HIP 21800 |
20.69 |
| 2026-06-18 12:00 |
04:43:05.05 |
+48:45:56.9 |
HIP 21800 |
21.36 |
| 2026-06-19 00:00 |
04:43:08.94 |
+48:46:06.5 |
HIP 21800 |
22.02 |
| 2026-06-19 12:00 |
04:43:12.81 |
+48:46:16.3 |
HIP 21800 |
22.67 |
| 2026-06-20 00:00 |
04:43:16.68 |
+48:46:26.2 |
HIP 21800 |
23.33 |
| 2026-06-20 12:00 |
04:43:20.54 |
+48:46:36.3 |
HIP 21800 |
23.99 |
| 2026-06-21 00:00 |
04:43:24.38 |
+48:46:46.5 |
HIP 21800 |
24.65 |
| 2026-06-21 12:00 |
04:43:28.22 |
+48:46:56.8 |
HIP 21800 |
25.30 |
| 2026-06-22 00:00 |
04:43:32.05 |
+48:47:07.2 |
HIP 21800 |
25.95 |