\begin{table}%t1
%\centering
\par
\caption{Observational details of target PNe. Diameters are computed.\label{obstable} }  
%\centering
\par
\begin{tabular}{lccccc}   
\hline \hline  
Object  & PN G & \multicolumn{2}{c}{RA  (J2000) ~  Dec} & Diameter &  $V_\odot$ \\               
Name    & Number      &        &     &                     [\arcsec]& [\kms]    \\    
\hline                                         
\object{BoBn 1}   & 108.4$-$76.1 & 00 37 18.0 & $-$13 42 12 & 1.5$\times$2.2 & $+174\pm10$\\          
\object{DdDm 1}	  & 061.9$+$41.3 & 16 40 19.4 & $+$38 42 03 & 1.4            & $-317\pm13$\\   
\object{IC 5117}  & 089.8$-$05.1 & 21 32 31.0 & $+$44 35 48 & 1.6$\times$3.5 & $-47\pm6$  \\   
\object{M 1--5}    & 184.0$-$02.1 & 05 46 50.2 & $+$24 22 02 & 2.3$\times$2.8 & $+28\pm7$\\  
\object{M~1--71}	  & 055.5$-$00.5 & 19 36 26.5 & $+$19 42 20 & 3.7$\times$6.0 & $+42\pm8$  \\  
\object{NGC~6833} & 082.5$+$11.3 & 19 49 46.6 & $+$48 57 40 & 0.5$\times$0.6 & $-110\pm2$ \\  
\hline  
\end{tabular}  
\end{table}