メタデータ
| 項目 |
値 |
| Designation |
C/2006 L2 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2006-11-20T04:47:09.041280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:58Z |
| Obs used |
400 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
7.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2006-09-29.0000000 |
| e |
1.00101694 |
| q (au) |
1.993947 |
| a (au) |
-1960.738221 |
| i (deg) |
101.022296 |
| Ω (om, deg) |
239.245982 |
| ω (w, deg) |
48.034913 |
| M (ma, deg) |
-0.000593 |
等級
散乱 + 全体線形
$$
M_a = (9.163 + 5.317\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.163 |
| n |
5.317 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.977 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2006-06-14 |
2006-10-14 |
+7.4648 |
-3.534 |
| 2006-12-02 |
2007-11-02 |
+6.0663 |
-2.640 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
03:49:37.49 |
-01:16:00.7 |
HIP 17914 |
9.34 |
| 2026-05-12 12:00 |
03:49:40.33 |
-01:15:51.8 |
HIP 17914 |
8.96 |
| 2026-05-13 00:00 |
03:49:43.18 |
-01:15:43.0 |
HIP 17914 |
8.62 |
| 2026-05-13 12:00 |
03:49:46.03 |
-01:15:34.4 |
HIP 17914 |
8.34 |
| 2026-05-14 00:00 |
03:49:48.89 |
-01:15:25.9 |
HIP 17914 |
8.11 |
| 2026-05-14 12:00 |
03:49:51.75 |
-01:15:17.5 |
HIP 17914 |
7.95 |
| 2026-05-15 00:00 |
03:49:54.61 |
-01:15:09.2 |
HIP 17914 |
7.85 |
| 2026-05-15 12:00 |
03:49:57.47 |
-01:15:01.1 |
HIP 17914 |
7.82 |
| 2026-05-16 00:00 |
03:50:00.33 |
-01:14:53.1 |
HIP 17914 |
7.86 |
| 2026-05-16 12:00 |
03:50:03.20 |
-01:14:45.3 |
HIP 17914 |
7.97 |
| 2026-05-17 00:00 |
03:50:06.07 |
-01:14:37.5 |
HIP 17914 |
8.14 |
| 2026-05-17 12:00 |
03:50:08.94 |
-01:14:29.9 |
HIP 17914 |
8.38 |
| 2026-05-18 00:00 |
03:50:11.81 |
-01:14:22.5 |
HIP 17914 |
8.68 |
| 2026-05-18 12:00 |
03:50:14.68 |
-01:14:15.1 |
HIP 17914 |
9.02 |
| 2026-05-19 00:00 |
03:50:17.55 |
-01:14:07.9 |
HIP 17914 |
9.41 |
| 2026-05-19 12:00 |
03:50:20.43 |
-01:14:00.9 |
HIP 17914 |
9.84 |
| 2026-05-20 00:00 |
03:50:23.30 |
-01:13:53.9 |
HIP 17914 |
10.31 |
| 2026-05-20 12:00 |
03:50:26.18 |
-01:13:47.1 |
HIP 17914 |
10.81 |
| 2026-05-21 00:00 |
03:50:29.05 |
-01:13:40.5 |
HIP 17914 |
11.33 |
| 2026-05-21 12:00 |
03:50:31.92 |
-01:13:34.0 |
HIP 17914 |
11.87 |
| 2026-05-22 00:00 |
03:50:34.80 |
-01:13:27.6 |
HIP 17914 |
12.44 |
| 2026-05-22 12:00 |
03:50:37.67 |
-01:13:21.4 |
HIP 17914 |
13.02 |
| 2026-05-23 00:00 |
03:50:40.54 |
-01:13:15.2 |
HIP 17914 |
13.62 |
| 2026-05-23 12:00 |
03:50:43.41 |
-01:13:09.3 |
HIP 17914 |
14.23 |
| 2026-05-24 00:00 |
03:50:46.28 |
-01:13:03.5 |
HIP 17914 |
14.85 |
| 2026-05-24 12:00 |
03:50:49.15 |
-01:12:57.8 |
HIP 17914 |
15.48 |
| 2026-05-25 00:00 |
03:50:52.01 |
-01:12:52.2 |
HIP 17914 |
16.11 |
| 2026-05-25 12:00 |
03:50:54.88 |
-01:12:46.8 |
HIP 17914 |
16.76 |
| 2026-05-26 00:00 |
03:50:57.74 |
-01:12:41.6 |
HIP 17914 |
17.41 |
| 2026-05-26 12:00 |
03:51:00.60 |
-01:12:36.4 |
HIP 18104 |
17.41 |
| 2026-05-27 00:00 |
03:51:03.46 |
-01:12:31.4 |
HIP 18104 |
16.70 |
| 2026-05-27 12:00 |
03:51:06.31 |
-01:12:26.6 |
HIP 18104 |
15.98 |
| 2026-05-28 00:00 |
03:51:09.17 |
-01:12:21.9 |
HIP 18104 |
15.27 |
| 2026-05-28 12:00 |
03:51:12.02 |
-01:12:17.4 |
HIP 18104 |
14.56 |
| 2026-05-29 00:00 |
03:51:14.87 |
-01:12:12.9 |
HIP 18104 |
13.85 |
| 2026-05-29 12:00 |
03:51:17.71 |
-01:12:08.7 |
HIP 18104 |
13.14 |
| 2026-05-30 00:00 |
03:51:20.55 |
-01:12:04.5 |
HIP 18104 |
12.44 |
| 2026-05-30 12:00 |
03:51:23.39 |
-01:12:00.6 |
HIP 18104 |
11.73 |
| 2026-05-31 00:00 |
03:51:26.22 |
-01:11:56.7 |
HIP 18104 |
11.04 |
| 2026-05-31 12:00 |
03:51:29.05 |
-01:11:53.0 |
HIP 18104 |
10.34 |
| 2026-06-01 00:00 |
03:51:31.88 |
-01:11:49.5 |
HIP 18104 |
9.65 |
| 2026-06-01 12:00 |
03:51:34.70 |
-01:11:46.1 |
HIP 18104 |
8.96 |
| 2026-06-02 00:00 |
03:51:37.51 |
-01:11:42.8 |
HIP 18104 |
8.28 |