\begin{table}%t6
\caption{Observational details, IR~photometry.} 
\label{tab:observations} 
\begin{tabular}{l c c c c c l}
\hline\hline
Date & MJD & $J$ & $H $& $K$ & $L^{\prime}$ & Telescope  \\ 
\hline
Sep. 06, 1987 & 47044.5   &  9.37~$\pm$~0.03 &  9.26~$\pm$~0.03 &  9.09~$\pm$~0.03 & 9.0~$\pm$~0.4 & TCS \\
Sep. 11, 1987 & 47049.5   &  9.70~$\pm$~0.04 &  9.48~$\pm$~0.04 &  9.28~$\pm$~0.04 & & TCS \\
Nov. 24, 1987 & 47123.5   &  9.16~$\pm$~0.03 &  9.08~$\pm$~0.03 &  8.92~$\pm$~0.03 & 8.71~$\pm$~0.06 & UKIRT \\
Dec. 28, 1987 & 47157.5   &  9.26~$\pm$~0.03 &  9.16~$\pm$~0.03 &  9.06~$\pm$~0.03 & & TCS \\
Jan. 01, 1988 & 47161.5   &  9.28~$\pm$~0.04 &  9.10~$\pm$~0.04 &  8.99~$\pm$~0.04 & 8.8~$\pm$~0.4 & TCS \\
Jan. 03, 1988 & 47163.5   &  9.24~$\pm$~0.03 &  9.08~$\pm$~0.03 &  8.97~$\pm$~0.03 & 8.8~$\pm$~0.3 & TCS \\
Jun. 23, 1988 & 47335.5   &  9.28~$\pm$~0.04 &  9.17~$\pm$~0.04 &  9.01~$\pm$~0.04 & & TCS \\
Jun. 24, 1988 & 47336.5   &  9.25~$\pm$~0.03 &  9.15~$\pm$~0.03 &  8.98~$\pm$~0.03 & & TCS \\
Jun. 28, 1988 & 47340.5   &  9.16~$\pm$~0.04 &  9.11~$\pm$~0.04 &  9.00~$\pm$~0.04 & & TCS \\
Apr. 14, 1991 & 48360.5   &  9.25~$\pm$~0.02 &  9.12~$\pm$~0.03 &  9.05~$\pm$~0.02 & & TCS \\
Apr. 17, 1991 & 48363.5   &  9.26~$\pm$~0.06 &  9.12~$\pm$~0.03 &  9.03~$\pm$~0.02 & & TCS \\
Aug. 23, 1991 & 48491.5   &  9.22~$\pm$~0.03 &  9.08~$\pm$~0.02 &  9.01~$\pm$~0.02 & & TCS \\
Aug. 24, 1991 & 48492.5   &  9.16~$\pm$~0.09 &  9.04~$\pm$~0.05 &  9.00~$\pm$~0.05 & & TCS \\
Aug. 25, 1991 & 48493.5   &  9.18~$\pm$~0.04 &  9.05~$\pm$~0.03 &  8.95~$\pm$~0.03 & & TCS \\
Aug. 27, 1991 & 48495.5   &  9.17~$\pm$~0.03 &  9.06~$\pm$~0.02 &  9.00~$\pm$~0.03 & & TCS \\
Aug. 28, 1991 & 48496.5   &  9.19~$\pm$~0.04 &  9.05~$\pm$~0.03 &  8.98~$\pm$~0.05 & & TCS \\
Nov. 29, 1991 & 48589.5   &  9.30~$\pm$~0.10 &  9.10~$\pm$~0.10 &  9.00~$\pm$~0.10 & & TCS \\
Dec. 01, 1991 & 48591.5   &  9.24~$\pm$~0.05 &  9.08~$\pm$~0.04 &  9.01~$\pm$~0.04 & & TCS \\
Jul. 20, 1992 & 48823.5   &  9.22~$\pm$~0.03 &  9.11~$\pm$~0.03 &  8.98~$\pm$~0.05 & & TCS \\
Aug. 04, 1992 & 48838.5   &  9.33~$\pm$~0.09 &  9.09~$\pm$~0.04 &  8.93~$\pm$~0.05 & & TCS \\
Aug. 21, 1992 & 48855.5   &  9.29~$\pm$~0.04 &  9.07~$\pm$~0.03 &  9.03~$\pm$~0.06 & & TCS \\
Aug. 21, 1992 & 48855.5   &  9.25~$\pm$~0.05 &  9.07~$\pm$~0.03 &  8.94~$\pm$~0.06 & & TCS \\
Aug. 22, 1992 & 48856.5   &  9.14~$\pm$~0.06 &  9.04~$\pm$~0.04 &  9.07~$\pm$~0.04 & & TCS \\
Aug. 23, 1992 & 48857.5   &  9.29~$\pm$~0.07 &  9.16~$\pm$~0.09 &  9.11~$\pm$~0.06 & & TCS \\
Jan. 12, 1993 & 48999.5   &  9.20~$\pm$~0.03 &  9.07~$\pm$~0.01 &  8.98~$\pm$~0.02 & & TCS \\
Jun. 22, 1993 & 49160.5   &  9.23~$\pm$~0.01 &  9.17~$\pm$~0.01 &  9.09~$\pm$~0.01 & 8.91~$\pm$~0.03 & UKIRT\\
Jun. 30, 1993 & 49169.5   &  9.27~$\pm$~0.03 &  9.14~$\pm$~0.02 &  9.02~$\pm$~0.02 & 8.9~$\pm$~0.3 & UKIRT\\
Ju.l 06, 1993 & 49175.5   &  9.26~$\pm$~0.02 &  9.14~$\pm$~0.03 &  9.03~$\pm$~0.02 & 8.9~$\pm$~0.2 & UKIRT\\
Jul. 07, 1993 & 49176.5   &  9.26~$\pm$~0.03 &  9.15~$\pm$~0.02 &  9.05~$\pm$~0.03 & & UKIRT\\
Dec. 20, 1993 & 49341.5   &  9.11~$\pm$~0.01 &  9.11~$\pm$~0.01 &  8.95~$\pm$~0.02 & & TCS  \\
Dec. 20, 1993 & 49341.5   &  9.11~$\pm$~0.01 &  9.08~$\pm$~0.01 &  8.93~$\pm$~0.01 & & TCS  \\
Dec. 20, 1993 & 49341.5   &  9.18~$\pm$~0.03 &  9.06~$\pm$~0.01 &  8.99~$\pm$~0.06 & & TCS  \\
Dec. 21, 1993 & 49342.5   &  9.26~$\pm$~0.02 &  9.18~$\pm$~0.01 &  9.09~$\pm$~0.03 & & TCS  \\
Dec. 21, 1993 & 49342.5   &  9.27~$\pm$~0.03 &  9.13~$\pm$~0.01 &  9.13~$\pm$~0.01 & & TCS  \\
Jun. 08, 1994 & 49511.5   &  9.16~$\pm$~0.02 &  9.16~$\pm$~0.01 &  9.01~$\pm$~0.01 & & TCS  \\
Jun. 09, 1994 & 49512.5   &  9.28~$\pm$~0.01 &  9.13~$\pm$~0.02 &  9.06~$\pm$~0.03 & & TCS  \\
Jun. 10, 1994 & 49513.5   &  9.16~$\pm$~0.03 &  9.07~$\pm$~0.01 &  9.04~$\pm$~0.03 & & TCS  \\
Jun. 11, 1994 & 49514.5   &  9.24~$\pm$~0.06 &  9.28~$\pm$~0.04 &  9.17~$\pm$~0.05 & & TCS \\
Jun. 21, 1994 & 49524.5   &  9.22~$\pm$~0.01 &  9.12~$\pm$~0.01 &  9.03~$\pm$~0.01 & & TCS  \\
Jun. 26, 1994 & 49529.5   &  9.22~$\pm$~0.02 &  9.14~$\pm$~0.01 &  9.06~$\pm$~0.03 & & TCS  \\
Jun. 28, 1994 & 49531.5   &  9.22~$\pm$~0.01 &  9.15~$\pm$~0.01 &  9.03~$\pm$~0.01 & & TCS  \\
Jun. 30, 1994 & 49533.5   &  9.24~$\pm$~0.01 &  9.09~$\pm$~0.02 &  9.08~$\pm$~0.02 & & TCS  \\
Jul. 01, 1994 & 49534.5   &  9.17~$\pm$~0.01 &  9.12~$\pm$~0.01 &  8.99~$\pm$~0.00 & & TCS  \\
Jul. 02, 1994 & 49535.5   &  9.26~$\pm$~0.02 &  9.20~$\pm$~0.01 &  9.09~$\pm$~0.01 & & TCS  \\
Jul. 03, 1994 & 49536.5   &  9.27~$\pm$~0.02 &  9.17~$\pm$~0.01 &  9.12~$\pm$~0.01 & & TCS  \\
Nov. 05, 1994 & 49661.5   &  9.16~$\pm$~0.01 &  9.09~$\pm$~0.01 &  9.06~$\pm$~0.01 & & TCS   \\
Nov. 06, 1994 & 49662.5   &  9.01~$\pm$~0.01 &  8.94~$\pm$~0.01 &  8.90~$\pm$~0.01 & & TCS  \\
Nov. 07, 1994 & 49663.5   &  9.28~$\pm$~0.02 &  9.21~$\pm$~0.01 &  9.14~$\pm$~0.02 & & TCS \\
Nov. 08, 1994 & 49664.5   &  9.29~$\pm$~0.02 &  9.18~$\pm$~0.01 &  9.08~$\pm$~0.00 & & TCS \\
Nov. 09, 1994 & 49665.5   &  9.21~$\pm$~0.01 &  9.11~$\pm$~0.01 &  9.08~$\pm$~0.01 & & TCS  \\
Jan. 02, 1995 & 49719.5   &  9.23~$\pm$~0.01 &  9.15~$\pm$~0.01 &  9.03~$\pm$~0.01 & & TCS  \\
Jan. 03, 1995 & 49720.5   &  9.12~$\pm$~0.01 &  9.07~$\pm$~0.01 &  9.00~$\pm$~0.01 & & TCS  \\
Jan. 05, 1995 & 49722.5   &  9.14~$\pm$~0.02 &  9.09~$\pm$~0.01 &  8.99~$\pm$~0.01 & & TCS  \\
Apr. 24, 1995 & 49831.5   &  9.16~$\pm$~0.01 &  9.07~$\pm$~0.01 &  9.02~$\pm$~0.02 & & TCS  \\
Apr. 25, 1995 & 49832.5   &  9.21~$\pm$~0.01 &  9.12~$\pm$~0.01 &  9.07~$\pm$~0.00 & & TCS  \\
Apr. 26, 1995 & 49833.5   &  9.25~$\pm$~0.01 &  9.13~$\pm$~0.01 &  9.03~$\pm$~0.01 & & TCS  \\
Apr. 28, 1995 & 49835.5   &  9.23~$\pm$~0.01 &  9.14~$\pm$~0.01 &  9.05~$\pm$~0.01 & & TCS  \\
Apr. 29, 1995 & 49836.5   &  9.20~$\pm$~0.01 &  9.08~$\pm$~0.01 &  9.04~$\pm$~0.01 & & TCS  \\
Jul. 28, 1995 & 49926.5   &  9.22~$\pm$~0.02 &  9.12~$\pm$~0.01 &  9.09~$\pm$~0.15 & & TCS  \\
Jul. 28, 1995 & 49926.5   &  9.23~$\pm$~0.01 &  9.04~$\pm$~0.01 &  9.60~$\pm$~0.13 & & TCS \\
Jul. 29, 1995 & 49927.5   &  9.18~$\pm$~0.01 &  9.06~$\pm$~0.01 &  8.94~$\pm$~0.06 & & TCS  \\
Jul. 29, 1995 & 49927.5   &  9.19~$\pm$~0.01 &  9.04~$\pm$~0.01 &  9.09~$\pm$~0.11 & & TCS  \\
Jul. 31, 1995 & 49929.5   &  9.27~$\pm$~0.01 &  9.10~$\pm$~0.01 &  8.95~$\pm$~0.01 & & TCS  \\
Oct. 11, 1995 & 50001.5   &  9.36~$\pm$~0.01 &  9.17~$\pm$~0.01 &  9.00~$\pm$~0.00 & & TCS \\
Oct. 14, 1995 & 50004.5   &  9.15~$\pm$~0.01 &  9.03~$\pm$~0.01 &  8.90~$\pm$~0.01 & & TCS \\
Jul. 27, 1996 & 50291.5   &  9.40~$\pm$~0.01 &  9.25~$\pm$~0.01 &  9.07~$\pm$~0.00 & & TCS  \\
Jul. 28, 1996 & 50292.5   &  9.14~$\pm$~0.01 &  9.03~$\pm$~0.01 &  8.92~$\pm$~0.01 & & TCS  \\
Jul. 16, 1997 & 50645.5   &  9.20~$\pm$~0.01 &  9.09~$\pm$~0.01 &  8.98~$\pm$~0.01 & & TCS  \\
Jul. 17, 1997 & 50646.5   &  9.18~$\pm$~0.01 &  9.06~$\pm$~0.01 &  8.96~$\pm$~0.01 & & TCS  \\
Jul. 19, 1997 & 50648.5   &  9.17~$\pm$~0.01 &  9.07~$\pm$~0.01 &  8.99~$\pm$~0.00 & & TCS  \\
Jun. 15, 1998 & 50979.5   &  9.16~$\pm$~0.01 &  9.09~$\pm$~0.01 &  8.98~$\pm$~0.01 & & TCS  \\
Jun. 16, 1998 & 50980.5   &  9.12~$\pm$~0.01 &  9.07~$\pm$~0.01 &  8.98~$\pm$~0.01 & & TCS \\
Jun. 17, 1998 & 50981.5   &  9.19~$\pm$~0.01 &  9.10~$\pm$~0.01 &  8.99~$\pm$~0.00 & & TCS  \\
Oct. 27, 1998 & 51113.5   &  9.29~$\pm$~0.01 &  9.17~$\pm$~0.01 &  9.13~$\pm$~0.00 & & TCS  \\
Jul. 26, 1999 & 51385.5   &  9.23~$\pm$~0.02 &  9.12~$\pm$~0.02 &  9.09~$\pm$~0.02 & & TCS  \\
Jul. 28, 1999 & 51387.5   &  9.20~$\pm$~0.02 &  9.13~$\pm$~0.02 &  9.05~$\pm$~0.02 & & TCS  \\
Jul. 31, 1999 & 51390.5   &  9.22~$\pm$~0.02 &  9.13~$\pm$~0.02 &  9.06~$\pm$~0.02 & & TCS  \\
Oct. 02, 1999 & 51453.5   &  9.18~$\pm$~0.02 &  9.08~$\pm$~0.02 &  8.98~$\pm$~0.02 & & TCS  \\
Oct. 04, 1999 & 51455.5   &  9.20~$\pm$~0.02 &  9.10~$\pm$~0.02 &  9.03~$\pm$~0.02 & & TCS  \\
Oct. 05, 1999 & 51456.5   &  9.20~$\pm$~0.02 &  9.13~$\pm$~0.01 &  9.02~$\pm$~0.02 & & TCS  \\
Jan. 15, 2001 & 51924.5   &  9.20~$\pm$~0.02 &  9.08~$\pm$~0.02 &  8.96~$\pm$~0.02 & & TCS  \\
\hline
\end{tabular}
\end{table}