\begin{table}%t1
\caption{\label{tab1}Observations log.}
%\centerline
 {\begin{tabular}{lrlrrrlccc} 
\hline\hline
Telescope/ & Observing     & Filter and & DIT & NDIT & NINT & {\it FWHM}  & Pixel scale & Detector orientation & Remarks \\ 
instrument & date          & obs. mode  & [s] &      &      & [mas] & [mas/px]  & [$^{\circ}$] (a) & \\ \hline
NTT/SHARP  & 6-July-2001  & $K$ imaging  & 0.5 & 250  & 2    & 671  & $49.5 \pm 0.2$ & $90.2 \pm 0.2$ & (b) \\
VLT/ISAAC  & 27-July-2002 & $J$ imaging  & 1.8 & 33   & 7    & 652  & $147.856 \pm 0.047$ & $179.96 \pm 0.01$ &(c) \\
VLT/ISAAC  & 27-July-2002 & $H$ imaging  & 1.8 & 33   & 7    & 801  & $147.856 \pm 0.047$ & $179.96 \pm 0.01$ &(c) \\ 
VLT/ISAAC  & 27-July-2002 & $K$ imaging  & 1.8 & 33   & 7    & 717  & $147.856 \pm 0.047$ & $179.96 \pm 0.01$ &(c) \\
VLT/FORS1  & 27-Mar.-2003  & red spectrum & 790 & (d)  & 3  & --    & 200 & 0 & (e) \\
VLT/NACO   & 4-Sept.-2003  & $K$ imaging  & 1.7 & 40   & 10   &  83  & $13.24 \pm 0.02$ & $-0.02 \pm 0.09$ & (g) \\
VLT/ISAAC  & 5-May-2004   & $K$ spectrum & 0.11 & 9   & 26   & --    & 71 & 0 & (e) \\
VLT/NACO   & 25-June-2004 & $K$ imaging  & 3.5 & 20   & 27   & 116 & $13.23 \pm 0.05$ & $0.14 \pm 0.25$ & (f) \\
VLT/NACO   & 13-June-2008 & $J$ imaging  & 20 & 3   & 22   & 391 & $13.243 \pm 0.056$ & $0.73 \pm 0.40$ & (g) \\ 
VLT/NACO   & 13-June-2008 & $H$ imaging  & 15 & 4   & 30   & 285 & $13.243 \pm 0.056$ & $0.73 \pm 0.40$ & (g) \\
VLT/NACO   & 13-June-2008 & $K$ imaging  & 10 & 6   & 30   & 231 & $13.243 \pm 0.056$ & $0.73 \pm 0.40$&(g)\\ \hline
\end{tabular}}
\par
\smallskip
Remarks: total exposure time are DIT (individual Detector Integration Times) times
NDIT (number of DITs, together saved in one fits file) times NINT (number of jitter positions and files).
(a) Measured from North over East to South. Positive detector orientations mean
that they are to be added to values measured on raw frames.
(b) Speckle imaging reported in K\"ohler et~al. (\cite{Kohler08}),
$500 \times 0.5$~s on two detector positions each. For astrometric calibration, see footnote~1.
(c) Astrometric calibration with 2MASS sources in the field-of-view.
(d) Three spectra of 790~s exposure each.
(e) Nominal pixel scale and detector orientation from the fits header.
(f) Astrometric calibration from Neuh\"auser et~al. (\cite{Neuhauser05}).
(g) Astrometry done as in Neuh\"auser et~al. (\cite{Neuhauser08}) with Galactic Center 
images for~2003 and images of the Hipparcos binary HIP~73~357 for 2008.
\end{table}