\begin{table}%t2
\caption{Observational details of the data set described in this paper.}  
\label{table:2}      % is used to refer this table in the text
%%\centering
                          % used for centering table
\par
%\centerline
{\begin{tabular}{l c c c c c  }        % centered columns (4 columns)
\hline
\hline               % inserts double horizontal lines
\multicolumn{1}{l}{Observatory} &
\multicolumn{1}{c}{ Telescope} &
\multicolumn{1}{c}{Equipment} &
\multicolumn{1}{c}{Field of view} &
\multicolumn{1}{c}{Pixel scale} &
\multicolumn{1}{c}{Exp. interval (s)}\\
\hline                        % inserts single horizontal line
Michigan State University$^{(1)}$ & 0.6-m & Apogee Ap47p CCD &  10 $\times$ 10$'$ &
1.1$''$/pix & 60-90  \\
Athens University Observatory$^{(1)}$ & 0.4-m & SBIG ST8 CCD & 15 $\times$ 22.5$'$ & 2.6$''$/pix &
30-40 \\
APT Arizona$^{(2)}$ & 0.7-m & EMI-9124QB PMT & - & - & 40 \\
Ankara University Observatory$^{(2)}$ & 0.3-m &  SSP-5A PMT & - & - & 40 \\
Beersel Hills Observatory$^{(3)}$ & 0.13-m & ST10XME
CCD & 43.8 $\times$ 29.4$'$ & 1.2$''$/pix & 50-130  \\
Beersel Hills Observatory$^{(3)}$ & 0.25-m & ST10XME
CCD & 33.9$'$ $\times$ 22.9' & 0.9$''$/pix & 50-130  \\
Vienna Observatory$^{(1)}$ & 0.8-m & Apogee Ap9e CCD & 10' $\times$ 14$'$ & 0.3$''$/pix & 60-90 \\
\hline
\end{tabular}}
\medskip
 $^{(1)}$  Comparison star: BD +42 3334, check star: BD +42 3339. 
 \\
$^{(2)}$  Comparison star: HD182755 = BD+42 3331, check star: BD +42 3334.
   \\
$^{(3)}$  Comparison star: GSC 3142 68 = SAO 48408, check star: GSC.
\end{table}