\begin{table}%t1
%\centering
\par
\caption{\label{tab_obs}Log of observations. }
\begin{tabular}[b!]{lccccccc}
\hline\hline
\noalign{\smallskip}
Star            & $\alpha$ ~~~~~~~~~~~~ $\delta$ & Date and time         & Exposure  & Setting &  Heliocentric& $g$ \\
                &                                &                      &  time     &         &  radial velocity                &    \\
                &  (J2000)                       & yyyy-mm-dd~ UT       &  (s)      &         &  \kms            & mag \\
\hline
\\
SDSS J1349-0229 & 13 49 13.5 --02 29 42.8 &  2007-01-31 07:32:54 & 3800  & Dic1 390+580  &92.3 & 16.63 \\
                &                        &  2009-04-15 02:24:25 & 3005  & Dic2 346+760  & 121.8 & 16.63 \\
                &                        &  2009-04-15 03:54:58 & 3005  & Dic2 346+760  & 121.7 & 16.63 \\
                &                        &  2009-04-15 04:52:57 & 3005  & Dic2 346+760  & 122.0 & 16.63 \\
                &                        &  2009-04-15 05:45:07 & 3005  & Dic2 346+760  & 122.4 & 16.63 \\
SDSS J0912+0216 & 09 12 43.7 +02 16 23.7  &  2006-12-31 07:41:05 & 3005  & Dic1 390+580  &138.0 & 15.67\\
SDSS J1036+1212 & 10 36 49.9 +12 12 19.8  &  2007-01-29 07:16:27 & 3005  & Dic1 390+580  &--47.9 & 16.59\\
\hline
\end{tabular}
\end{table}