\begin{table}%t5
      \caption{\label{log_phot}Log of the photometric observations.}  
%\begin{center}
{               \begin{tabular}{lccccccr}
            	\hline\hline
            	Observing date	& Start		& Exposure 		& $\Delta t$	& Telescope	& Instrument 	& Filter  	& Reference \\	
		& MJD		& time (s)		& (h)		& 		& 	 	& 	  	& \\	
            	            	\hline
            	1998 Jan. 22	 & 50~835.929	 & 1 $\times$ 1800	   & $<$1	 & IAC-80	 & {\sc ccd}	 & $I$  	 & B\'ejar et~al. (2004) \\
1998 Jan. 22	 & 50~835.983	 & 1 $\times$ 1800	   & $<$1	 & IAC-80	 & {\sc ccd}	 & $R$  	 & B\'ejar et~al. (2004) \\
1999 Jan. 22	 & 51~201.047	 & 1 $\times$ 720	   & $<$1	 & TCS  	 & {\sc cain-2}  & $J$  	 & this paper \\
1999 Jan. 24	 & 51~202.870	 & 1 $\times$ 720	   & $<$1	 & TCS  	 & {\sc cain-2}  & $J$  	 & B\'ejar et~al. (2004) \\
2000 Dec. 30	 & 51~909.075	 & 5 $\times$ 1500	   & 1.4	 & INT  	 & {\sc wfc}	 & $I$  	 & Caballero et~al. (2004) \\
2000 Dec. 31	 & 51~909.901	 & 10 $\times$ 1500	   & 4.7	 & INT  	 & {\sc wfc}	 & $I$  	 & Caballero et~al. (2004) \\
2001 Jan. 01	 & 51~911.055	 & 6 $\times$ 1500	   & 5.2	 & INT  	 & {\sc wfc}	 & $I$  	 & Caballero et~al. (2004) \\
2001 Dec. 10	 & 52~254.295	 & 1 $\times$ 1920	   & $<$1	 & {\em Antu}	 & {\sc isaac}   & $J$  	 & Caballero et~al. (2005) \\
2003 Jan 12	 & 52~647.414	 & 12 $\times$ 1200	   & 4.2	 & INT  	 & {\sc wfc}	 & $I$  	 & Caballero et~al. (2004) \\
2003 Oct. 19	 & 52~932.023	 & 1 $\times$ 3600	   & $<$1	 & 3.5~m CA	 & {\sc o2k}	 & $H$  	 & Caballero et~al. (2005) \\
2003 Oct. 22	 & 52~935.201	 & 1 $\times$ 600	   & $<$1	 & 3.5~m CA	 & {\sc o2k}	 & $H$  	 & Caballero et~al. (2005) \\
2003 Dec. 22	 & 52~995.596	 & 3 $\times$ 600	   & $<$1	 & TCS  	 & {\sc cain-2}  & $J$  	 & this paper \\
2003 Dec. 22	 & 52~996.086	 & 1 $\times$ 1200	   & $<$1	 & TCS  	 & {\sc cain-2}  & $H$  	 & this paper \\
2003 Dec. 26	 & 53~000.092	 & 3 $\times$ 120	   & $<$1	 & IAC-80	 & {\sc ccd}	 & $I$  	 & this paper \\
2003 Dec. 28	 & 53~002.080	 & 6 $\times$ 600	   & $\sim$1	 & IAC-80	 & {\sc ccd}	 & $I$  	 & this paper \\
2004 Jan. 11	 & 53~016.116	 & 10$\times$ 300	   & $\sim$1	 & OGS  	 & {\sc esaccd}  & $W$$^{{a}}$& this paper \\
2004 Jan. 14	 & 53~019.061	 & 20 $\times$ 300	   & 1.9	 & OGS  	 & {\sc esaccd}  & $W$$^{{a}}$& this paper \\
2004 Jan. 24	 & 53~028.859	 & 13 $\times$ 600	   & 2.2	 & IAC-80	 & {\sc ccd}	 & $I$  	 & this paper \\
2004 Jan. 25	 & 53~029.843	 & 14 $\times$ 600	   & 2.7	 & IAC-80	 & {\sc ccd}	 & $I$  	 & this paper \\
2004 Jan. 30	 & 53~034.879	 & 3 $\times$ 1200	   & $<$1	 & IAC-80	 & {\sc ccd}	 & $I$  	 & this paper \\
2004 Jan. 30	 & 53~034.854	 & 46 $\times$ 300	   & 4.0	 & OGS  	 & {\sc esaccd}  & $W$$^{{a}}$& this paper \\
2004 Jan. 31	 & 53~035.887	 & 30 $\times$ 300	   & 2.7	 & OGS  	 & {\sc esaccd}  & $W$$^{{a}}$& this paper \\
2004 Feb. 1	 & 53~036.833	 & 45 $\times$ 300	   & 6.3	 & OGS  	 & {\sc esaccd}  & $W$$^{{a}}$& this paper \\
2004 Feb. 2	 & 53~037.875	 & 26 $\times$ 300	   & 4.6	 & OGS  	 & {\sc esaccd}  & $W$$^{{a}}$& this paper \\
2004 Feb. 3	 & 53~038.948	 & 6 $\times$ 600	   & $\sim$1	 & IAC-80	 & {\sc ccd}	 & $I$  	 & this paper \\
           	            	\hline\\[-3mm]
         \end{tabular}}
	\parbox{14.5cm}{
	 $^{{a}}$  $W$: optical images taken with no filter.}
%\end{center}
\end{table}