\begin{table}%T3
%\centering
\par
            \caption{The object A's magnitudes.}\label{magnitudes del objeto A}
      \begin{tabular}{cc}
\hline\hline
Band & Magnitude        \\
\par
\hline
 $U$ & 23.31 $\pm$ 0.15 \\
 $B$ & 22.96 $\pm$ 0.04 \\
 $V$ & 21.61 $\pm$ 0.03 \\
 $R$ & 20.65 $\pm$ 0.06 \\
 $I$ & 20.11 $\pm$ 0.06 \\
 $J$ & 18.67 $\pm$ 0.05 \\
 $H$ & 17.95 $\pm$ 0.05 \\
 $K$ & 17.01 $\pm$ 0.05 \\
\hline
\par
      \end{tabular}
\end{table}