メタデータ
| 項目 |
値 |
| Designation |
C/2011 L1 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-12-18T07:14:56.696640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:51Z |
| Obs used |
140 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
12.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-06-22.0000000 |
| e |
0.79679852 |
| q (au) |
2.242374 |
| a (au) |
11.035223 |
| i (deg) |
65.512678 |
| Ω (om, deg) |
252.363846 |
| ω (w, deg) |
294.470660 |
| M (ma, deg) |
4.992746 |
等級
散乱 + 全体線形
$$
M_a = (13.123 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.123 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.781 |
| k |
0.999 |
| 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 |
| 2011-06-02 |
2012-07-23 |
-10.7811 |
+4.882 |
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) |
| 2026-03-26 00:00 |
22:49:29.14 |
+57:38:43.2 |
HIP 112915 |
20.71 |
| 2026-03-26 12:00 |
22:49:39.69 |
+57:39:30.2 |
HIP 112915 |
19.17 |
| 2026-03-27 00:00 |
22:49:50.21 |
+57:40:17.7 |
HIP 112915 |
17.64 |
| 2026-03-27 12:00 |
22:50:00.70 |
+57:41:05.7 |
HIP 112915 |
16.14 |
| 2026-03-28 00:00 |
22:50:11.15 |
+57:41:54.2 |
HIP 112915 |
14.67 |
| 2026-03-28 12:00 |
22:50:21.57 |
+57:42:43.2 |
HIP 112915 |
13.23 |
| 2026-03-29 00:00 |
22:50:31.96 |
+57:43:32.7 |
HIP 112915 |
11.85 |
| 2026-03-29 12:00 |
22:50:42.32 |
+57:44:22.7 |
HIP 112915 |
10.54 |
| 2026-03-30 00:00 |
22:50:52.64 |
+57:45:13.2 |
HIP 112915 |
9.33 |
| 2026-03-30 12:00 |
22:51:02.92 |
+57:46:04.2 |
HIP 112915 |
8.28 |
| 2026-03-31 00:00 |
22:51:13.18 |
+57:46:55.7 |
HIP 112915 |
7.43 |
| 2026-03-31 12:00 |
22:51:23.39 |
+57:47:47.7 |
HIP 112915 |
6.87 |
| 2026-04-01 00:00 |
22:51:33.57 |
+57:48:40.2 |
HIP 112915 |
6.68 |
| 2026-04-01 12:00 |
22:51:43.71 |
+57:49:33.1 |
HIP 112915 |
6.89 |
| 2026-04-02 00:00 |
22:51:53.82 |
+57:50:26.6 |
HIP 112915 |
7.45 |
| 2026-04-02 12:00 |
22:52:03.89 |
+57:51:20.5 |
HIP 112915 |
8.31 |
| 2026-04-03 00:00 |
22:52:13.92 |
+57:52:14.9 |
HIP 112915 |
9.37 |
| 2026-04-03 12:00 |
22:52:23.91 |
+57:53:09.8 |
HIP 112915 |
10.58 |
| 2026-04-04 00:00 |
22:52:33.87 |
+57:54:05.1 |
HIP 112915 |
11.89 |
| 2026-04-04 12:00 |
22:52:43.78 |
+57:55:00.9 |
HIP 112915 |
13.27 |
| 2026-04-05 00:00 |
22:52:53.66 |
+57:55:57.2 |
HIP 112915 |
14.71 |
| 2026-04-05 12:00 |
22:53:03.49 |
+57:56:53.9 |
HIP 112915 |
16.18 |
| 2026-04-06 00:00 |
22:53:13.29 |
+57:57:51.1 |
HIP 112915 |
17.68 |
| 2026-04-06 12:00 |
22:53:23.04 |
+57:58:48.7 |
HIP 112915 |
19.20 |
| 2026-04-07 00:00 |
22:53:32.75 |
+57:59:46.8 |
HIP 112915 |
20.74 |
| 2026-04-07 12:00 |
22:53:42.42 |
+58:00:45.3 |
HIP 113255 |
21.62 |
| 2026-04-08 00:00 |
22:53:52.05 |
+58:01:44.3 |
HIP 113255 |
20.02 |
| 2026-04-08 12:00 |
22:54:01.63 |
+58:02:43.7 |
HIP 113255 |
18.43 |
| 2026-04-09 00:00 |
22:54:11.17 |
+58:03:43.6 |
HIP 113255 |
16.84 |
| 2026-04-09 12:00 |
22:54:20.66 |
+58:04:43.8 |
HIP 113255 |
15.26 |
| 2026-04-10 00:00 |
22:54:30.11 |
+58:05:44.6 |
HIP 113255 |
13.69 |
| 2026-04-10 12:00 |
22:54:39.52 |
+58:06:45.7 |
HIP 113255 |
12.13 |
| 2026-04-11 00:00 |
22:54:48.88 |
+58:07:47.3 |
HIP 113255 |
10.59 |
| 2026-04-11 12:00 |
22:54:58.19 |
+58:08:49.3 |
HIP 113255 |
9.08 |
| 2026-04-12 00:00 |
22:55:07.45 |
+58:09:51.7 |
HIP 113255 |
7.61 |
| 2026-04-12 12:00 |
22:55:16.67 |
+58:10:54.5 |
HIP 113255 |
6.21 |
| 2026-04-13 00:00 |
22:55:25.84 |
+58:11:57.8 |
HIP 113255 |
4.95 |
| 2026-04-13 12:00 |
22:55:34.96 |
+58:13:01.4 |
HIP 113255 |
3.95 |
| 2026-04-14 00:00 |
22:55:44.04 |
+58:14:05.5 |
HIP 113255 |
3.46 |
| 2026-04-14 12:00 |
22:55:53.06 |
+58:15:09.9 |
HIP 113255 |
3.67 |
| 2026-04-15 00:00 |
22:56:02.03 |
+58:16:14.8 |
HIP 113255 |
4.50 |
| 2026-04-15 12:00 |
22:56:10.96 |
+58:17:20.0 |
HIP 113255 |
5.67 |
| 2026-04-16 00:00 |
22:56:19.83 |
+58:18:25.6 |
HIP 113255 |
7.02 |