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) |
| 2026-07-29 00:00 |
04:47:28.20 |
+49:05:20.0 |
HIP 22282 |
14.05 |
| 2026-07-29 12:00 |
04:47:30.53 |
+49:05:38.3 |
HIP 22282 |
13.66 |
| 2026-07-30 00:00 |
04:47:32.84 |
+49:05:56.6 |
HIP 22282 |
13.28 |
| 2026-07-30 12:00 |
04:47:35.11 |
+49:06:15.0 |
HIP 22282 |
12.90 |
| 2026-07-31 00:00 |
04:47:37.35 |
+49:06:33.4 |
HIP 22282 |
12.53 |
| 2026-07-31 12:00 |
04:47:39.57 |
+49:06:51.9 |
HIP 22282 |
12.16 |
| 2026-08-01 00:00 |
04:47:41.76 |
+49:07:10.5 |
HIP 22282 |
11.81 |
| 2026-08-01 12:00 |
04:47:43.91 |
+49:07:29.2 |
HIP 22282 |
11.46 |
| 2026-08-02 00:00 |
04:47:46.04 |
+49:07:47.9 |
HIP 22282 |
11.12 |
| 2026-08-02 12:00 |
04:47:48.14 |
+49:08:06.6 |
HIP 22282 |
10.79 |
| 2026-08-03 00:00 |
04:47:50.21 |
+49:08:25.4 |
HIP 22282 |
10.47 |
| 2026-08-03 12:00 |
04:47:52.25 |
+49:08:44.3 |
HIP 22282 |
10.16 |
| 2026-08-04 00:00 |
04:47:54.26 |
+49:09:03.3 |
HIP 22282 |
9.86 |
| 2026-08-04 12:00 |
04:47:56.24 |
+49:09:22.2 |
HIP 22282 |
9.57 |
| 2026-08-05 00:00 |
04:47:58.18 |
+49:09:41.3 |
HIP 22282 |
9.29 |
| 2026-08-05 12:00 |
04:48:00.10 |
+49:10:00.4 |
HIP 22282 |
9.02 |
| 2026-08-06 00:00 |
04:48:01.99 |
+49:10:19.6 |
HIP 22282 |
8.76 |
| 2026-08-06 12:00 |
04:48:03.84 |
+49:10:38.8 |
HIP 22282 |
8.52 |
| 2026-08-07 00:00 |
04:48:05.66 |
+49:10:58.0 |
HIP 22282 |
8.29 |
| 2026-08-07 12:00 |
04:48:07.46 |
+49:11:17.3 |
HIP 22282 |
8.08 |
| 2026-08-08 00:00 |
04:48:09.22 |
+49:11:36.7 |
HIP 22282 |
7.88 |
| 2026-08-08 12:00 |
04:48:10.94 |
+49:11:56.1 |
HIP 22282 |
7.70 |
| 2026-08-09 00:00 |
04:48:12.64 |
+49:12:15.5 |
HIP 22282 |
7.54 |
| 2026-08-09 12:00 |
04:48:14.30 |
+49:12:35.0 |
HIP 22282 |
7.39 |
| 2026-08-10 00:00 |
04:48:15.93 |
+49:12:54.6 |
HIP 22282 |
7.26 |
| 2026-08-10 12:00 |
04:48:17.53 |
+49:13:14.1 |
HIP 22282 |
7.15 |
| 2026-08-11 00:00 |
04:48:19.10 |
+49:13:33.7 |
HIP 22282 |
7.06 |
| 2026-08-11 12:00 |
04:48:20.63 |
+49:13:53.4 |
HIP 22282 |
6.99 |
| 2026-08-12 00:00 |
04:48:22.13 |
+49:14:13.1 |
HIP 22282 |
6.94 |
| 2026-08-12 12:00 |
04:48:23.59 |
+49:14:32.8 |
HIP 22282 |
6.90 |
| 2026-08-13 00:00 |
04:48:25.03 |
+49:14:52.6 |
HIP 22282 |
6.89 |
| 2026-08-13 12:00 |
04:48:26.42 |
+49:15:12.4 |
HIP 22282 |
6.89 |
| 2026-08-14 00:00 |
04:48:27.79 |
+49:15:32.2 |
HIP 22282 |
6.92 |
| 2026-08-14 12:00 |
04:48:29.12 |
+49:15:52.1 |
HIP 22282 |
6.96 |
| 2026-08-15 00:00 |
04:48:30.41 |
+49:16:12.0 |
HIP 22282 |
7.01 |
| 2026-08-15 12:00 |
04:48:31.68 |
+49:16:31.9 |
HIP 22282 |
7.09 |
| 2026-08-16 00:00 |
04:48:32.90 |
+49:16:51.8 |
HIP 22282 |
7.17 |
| 2026-08-16 12:00 |
04:48:34.10 |
+49:17:11.8 |
HIP 22282 |
7.28 |
| 2026-08-17 00:00 |
04:48:35.25 |
+49:17:31.8 |
HIP 22282 |
7.39 |
| 2026-08-17 12:00 |
04:48:36.38 |
+49:17:51.8 |
HIP 22282 |
7.52 |
| 2026-08-18 00:00 |
04:48:37.46 |
+49:18:11.8 |
HIP 22282 |
7.65 |
| 2026-08-18 12:00 |
04:48:38.52 |
+49:18:31.9 |
HIP 22282 |
7.80 |
| 2026-08-19 00:00 |
04:48:39.53 |
+49:18:52.0 |
HIP 22282 |
7.96 |