\begin{table}%t1
\caption{The list of observatories and telescopes, $D$ is the telescope aperture diameter.}
\label{tab_tel}
%\centering
\small
\begin{tabular}{r l c l}
\hline\hline
Code & Observing site &	$D$ [cm] & Observers \\
\hline
1 & Blauvac Observatory, France					& 31 & R. Roy \\
2 & Borowiec Station, Pozna\'n Observatory, Poland		& 40 & A. Marciniak, R. Hirsch, K. Kami\'nski, \\
  &	 							&    & M. Fagas, T. Micha{\l}owski, T. Kwiatkowski\\
3 & Carbuncle Hill Observatory, Rhode Island, USA		& 35 & D. Pray \\
4 & Egan Observatory, Florida, USA				& 40 & M. Fauerbach, T. Bennett \\
5 & Observatori Astronomic de Consell, Mallorca, Spain		& 40 & A. Lopez, R. Pacheco \\
7 & Ond\v{r}ejov Observatory, Czech Republic 			& 65 & M. Wolf, J. \v{D}urech\\
8 & Ostrowik, Poland						& 60 & W. Pych\\
9 & Pic du Midi, France						& 105 & T. Micha{\l}owski, J. Berthier \\
11 & Santana Observatory, CA, USA     				& 35 & R. Stephens \\
12 & Shed of Science Observatory, Minneapolis, USA		& 25 & R. Durkee \\
13 & Pic de Chateau-Renard Observatory, France			& 62 & S. Fauvaud, G. Santacana \\
14 & Waterlooville, Hampshire, England 				& 25 & R. Dymock \\
15 & Whitin Observatory, Massachusetts, USA			& 61 & S. Slivan, M. Frey \\
16 & Mt Tarana Observatory, Bathurst, Australia			& 40 & C. Bembrick \\
17 & Craigie, Australia						& 25 & G. Bolt \\
18 & Pleasant Plains, Illinois, USA				& 35 & F. Pilcher, D. Jardine \\
19 & Le Cr\`es, France						& 25 & R. Poncy \\
20 & Linhaceira Observatory, Portugal				& 25 & R. Gon\c{c}alves \\
21 & Stazione Astronomica di Sozzago, Italy			& 40 & R. Crippa, F. Manzini \\
22 & Vintage Lane Observatory, Blenheim, New Zealand		& 30 & W. H. Allen \\
23 & The WW Crow Observatory, England				& 20 & M. Crow \\
24 & Antelope Hills Observatory, Colorado, USA			& 25 & R. Koff \\
25 & Les Engarouines  Observatory, France       		& 21 & L. Bernasconi \\
26 & Goat Mountain Astronomical Research Station, USA		& 35 & R. Stephens \\
27 & Gnosca Observatory, Switzerland				& 40 & S. Sposetti\\	
28 & Wallace Astrophysical Observatory, Massachusetts, USA	& 61 & S. Slivan \\
29 & Wallace Astrophysical Observatory, Massachusetts, USA	& 35 & M. Pan, L. Crespo da Silva, S. Boroumand\\ 
\hline
\end{tabular}
\end{table}