\begin{table}%t4
%\centering
\par
  \caption{Spectroscopic observations.\label{tab:specobs}}
  
    \begin{tabular}{llllcrr}
    \hline
    \hline
    Object &Instrument&$\lambda$ range [\AA]& 
    \multicolumn{2}{l}{Start time (UT)}&  Exp. time & HJD \\
    \hline
    \object{2MASS~J0516288+260738}&TWIN&3900--5000, 6000--7090
               &2002  Feb.  23 & 21:34& 1800~s & 2~452~329.411\\
    G191-B2B   &TWIN&3900--5000, 6000--7090
               &2002  Feb.  25 & 18:40&  300~s & 2~452~331.281\\
    \object{2MASS~J0516288+260738}&TWIN&3900--5000, 6000--7090 
               &2002  Feb.  25 & 20:49& 1800~s & 2~452~331.380\\
    \object{2MASS~J0516288+260738}&OMEGA-Cass&$HK$: \hfill 14~000--25~000
               &2002  Oct.  27 &23:31&24~$\times$~120~s& 2~452~575.484\\
    GD~71     &OMEGA-Cass&$HK$: \hfill 14000--25000
               &2002  Oct.  28 &02:21&10~$\times$~120~s& 2~452~575.602\\
    \object{2MASS~J0516288+260738}&OMEGA-Cass&$JH$: \hfill 10~000--18~000
               &2003  Feb.  03 &21:49&24~$\times$~120~s& 2~452~674.412\\
    GD~71     &OMEGA-Cass&$JH$: \hfill 10~000~--~18~000
               &2003  Feb.  03 &23:12&24~$\times$~120~s& 2~452~674.470\\
    \hline
  \end{tabular}
  
\end{table}