\begin{table}%t3
%\centering
\par
\caption{\label{tab3}$V$ and $R$ magnitudes.}             % title of Table
\begin{tabular}{l c c c }        % centered columns (4 columns)
\hline\hline                 % inserts double horizontal lines
Date      & $\alpha$ &   $R$   &   $V$     \\    % table heading
          & (deg)  & (mag) & (mag)   \\
\hline                        % inserts single horizontal line
12 Apr. 08 &  5.03 & 13.14~$\pm$~0.02 & 13.67~$\pm$~0.02 \\
17 Apr. 08 &  3.50 & 13.13~$\pm$~0.02 & 13.65~$\pm$~0.02 \\
18 Apr. 08 &  3.36 & 13.11~$\pm$~0.03 & 13.64~$\pm$~0.03 \\
19 Apr. 08 &  3.29 & 13.12~$\pm$~0.02 & 13.64~$\pm$~0.02 \\
20 Apr. 08 &  3.30 & 13.12~$\pm$~0.04 & 13.66~$\pm$~0.04 \\
02 May 08 &  7.34 & 13.22~$\pm$~0.02 & 13.72~$\pm$~0.02 \\
04 May 08 &  8.27 & 13.26$\pm$~0.02 & 13.75~$\pm$~0.02 \\
10 May 08 & 11.01 & 13.33~$\pm$~0.03 & 13.81~$\pm$~0.03 \\
11 May 08 & 11.46 & 13.35~$\pm$~0.02 & 13.83~$\pm$~0.02 \\
31 May 08 & 19.38 & 13.55~$\pm$~0.02 & -- \\
02 Jun. 08 & 20.01 & 13.52~$\pm$~0.03 & 14.02~$\pm$~0.03 \\
03 Jun. 08 & 20.33 & 13.53~$\pm$~0.02 & 14.04~$\pm$~0.03  \\
\hline
\end{tabular}
\end{table}