\begin{table}%t2
%\centering
\par
\caption{Log of HST observations.} \label{t2}
\begin{tabular}{lccc} 
\hline\hline Source name & Filter & ${t_{\rm exp}}$(s) & GO program ID \\ 
\hline 
\par
\object{3C~16} & \it F702W & $8300$ & $6675$\\
\object{3C~19} &\it  F785LP & $1000$ & $9045$\\
\object{3C~46} &\it  F702W & $300$ & $5476$\\
\object{3C~47}  &\it  F702W & $280$ & $5476$\\
\object{3C~99} &\it  F702W & $300$ & $5476$\\ 
\object{3C~147} &\it  F702W  & $280$ & $5476$\\  
\object{3C~154} &\it   F702W & $280$ &  $5476$\\ 
\object{3C~172} &\it  F702W  & $300$ & $5476$\\  
\object{3C~200} &\it  F702W &  $300$ & $5476$\\ 
\object{3C~215}  &\it  F702W &  $280$ &  $5476$\\ 
\object{3C~225.0B}  &\it  F702W &  $300$ & $5476$\\ 
\object{3C~228} & \it  F702W & $300$  & $5476$\\  
\object{3C~244.1} & \it  F702W & $300$ & $5476$\\ 
\object{3C~274.1} &\it   F785LP & $2000$ & $9045$\\
\object{3C~275} &\it  F702W & $300$& $5476$\\ 
\object{3C~275.1} &\it  F675W &  $1000$ & $5978$\\  
\object{3C~295} &\it   F702W & $6300$ &  $5378$\\
\object{3C~306.1} &\it  F702W & $300$ & $5476$\\ 
\object{3C~313} &\it  F702W  & $300$ & $5476$\\  
\object{3C~330} &\it  F555W &  $600$ & $6348$\\ 
\object{3C~334} & \it  F702W &  $280$ &  $5476$\\  
\object{3C~341}  &\it  F702W  & $300$  & $5476$\\ 
\object{3C~345} &\it  F555W & $2800$ & $5235$\\ 
\object{3C~411} &\it  F702W & $300$ & $5476$\\ 
\object{3C~427.1} &\it  F702W &  $300$ & $5476$\\ 
\object{3C~435A} &\it  F702W & $7400$ & $6675$\\ 
\object{3C~455}  &\it  F702W & $300$ & $5476$\\ 
\hline 
\end{tabular} 
\end{table}