\begin{table}%t2
%\centering
\par
%\setlength{\tabcolsep}{4pt}
  \caption{Key to observatory sites.\label{tab:observatories}}
  \begin{tabular}{llll}
    \hline
    \hline
    Site  &  & Telescope & Observers\\
    \hline
    CAHA  & Calar Alto Observatory, Centro Astron\'{o}mico Hispano Alem\'{a}n, Almer\'{\i}a, Spain & 2.2~m & SD, SLS\\
    CAHA II&Calar Alto Observatory, Centro Astron\'{o}mico Hispano Alem\'{a}n, Almer\'{\i}a, Spain & 1.2~m & TN, EG\\
    BOAO  & Bohyunsan Optical Astronomy Observatory, Korea                     & 1.8~m & SLK, BGP\\    
    SAAO  & South African Astronomical Observatory, Sutherland, South Africa & 1.0~m & GH, TM\\
    SARA  & %Southeastern Association for Research in Astronomy, 
    Kitt Peak National Observatory, Tucson, Arizona, United States of America & 0.9~m & MW\\
    GAO   & Gunma Astronomical Observatory, Japan                        & 1.5~m & OH, KK, HT, EK\\
    WISE  & The Florence and George Wise Observatory, Tel-Aviv University, Israel & 1.0~m & EL, PI, YL\\
    Piszk\'estet\H o & Piszk\'estet\H o, the mountain station of Konkoly Observatory, M\'atra Mountains, Hungary & 1.0~m & MP, BS, GV, DZ\\
   \hline
  \end{tabular}
\end{table}