\begin{table}%t1 \par \caption{\label{obslog}Summary of the AMBER observations of Betelgeuse and the calibrator Sirius. } \small%%\centerline { \begin{tabular}{l l c c c c l l l r r} \hline\hline \# & Name & Night & $t_{\rm obs}$ & Tel. & $B_{\rm p}$ & PA & Seeing (\arcsec) & Airmass & DIT & Number\\ & & & (UTC) & & (m) & (\degr)& (visible) & & (ms)& of frames \\ \hline \multicolumn{11}{c}{2008, \HRK\ ($\lambda /\Delta \lambda$ = 12~000), 2.28--2.31~\micron}\\ \hline 1 & Betelgeuse & Jan. 08 & 03:52:58 & E0-G0-H0 & 16.00/31.97/47.96 & 73 & 0.4 & 1.19 & 120 & 2500\\ Cal & Sirius & Jan. 08 & 04:18:54 & E0-G0-H0 & 16.00/31.99/47.99 & 72 & 0.3 & 1.01 & 120 & 2500\\ 2 & Betelgeuse & Jan. 08 & 04:48:24 & E0-G0-H0 & 15.70/31.37/47.06 & 71 & 0.3 & 1.28 & 120 & 2500\\ \hline \multicolumn{11}{c}{2006, \MRK\ ($\lambda /\Delta \lambda$ = 1500), 2.1--2.2~\micron}\\ \hline 3 & Betelgeuse & Feb. 10 & 02:45:08 & E0-G0 & 15.45 & 70 & 1.1 & 1.33 & 48 & 6000 \\ Cal & Sirius & Feb. 10 & 04:50:22 & E0-G0 & 12.73 & 81 & 1.1 & 1.32 & 48 & 2500 \\ \hline \end{tabular}} \smallskip Note: $B_{\rm p}$ (projected baseline length), PA (position angle of the projected baseline vector). \end{table}