\documentstyle[epsf,twoside]{article}

\input ibvs2.sty
\input ibvst.sty

\begin{document}

\IBVShead{4819}{21 December 1999}

\IBVStitletl{GSC 3151\_2126: A New Variable}

\IBVSauth{\v{S}af\'{a}\v{r}, Jan}

\IBVSinsto{N. Copernicus Observatory and Planetarium, Krav\'{\i} hora 2,
616 00 Brno, Czech Republic,\\ \indent e-mail: safarplanetar@email.cz}

\SIMBADobj{GSC 3151-2126}

\begintext

\IBVSTnam{GSC 3151\_2126}

\IBVSTcoo{20\hr15\mm17\fsec577}{+37\deg31\arcm43\farcs40}{2000.0}

\IBVSTobs{N. Copernicus Observatory and Planetarium, 0.4-m Newton telescope}

\IBVSTdet{CCD, SBIG ST7}

\IBVSTfil{Without filter}

\IBVSTcomp{GSC 3151\_2212}

\IBVSTchk{GSC 2684\_0631, GSC 3151\_2170}

\IBVSTsysn

\IBVSTtyp{ EA }

\IBVSTrem{
The variability of GSC 3151\_2126 was found while being used
as comparison star for new variable GSC 2684\_1255. CCD observations
show that this star has light variations with an amplitude of 0.78 magnitude in the instrumental band. The range of light variations GSC
3151\_2126 is between 11.73 to 12.51 magnitude.\\
A period was computed by neural network software LANCELOT (Gaspani 1999).\\
The ephemeris is as follows:
$$\begin{array}{r@{}r@{}l}
{\rm Min~JD_{hel}} = 2451427.4063 & {} + 0\fday610510 & {} \times E. \\
                       \pm 0.0013 &      \pm 0.000035 \\
\end{array}$$
The shape of the observed light curve corresponds to those of Algol type eclipsing binaries. During observation (from 15 Aug.\ to 31 Oct.\ 1999) four times of minima were recorded. Secondary minimum was not detected. Resulting times of light minima of the variable star GSC 3151\_2126 are presented in Table~1. Figure~1 shows the light curve of GSC 3151\_2126.}

\begin{table}
\begin{center}
{\normalsize Table 1}
\vskip 2mm
\begin{tabular}{ccrrl}
\hline
Min JD hel & \raise-6pt\hbox{Uncertainty} &
\multicolumn{1}{c}{\raise-6pt\hbox{$E$}} & \multicolumn{1}{c}{\raise-6pt\hbox{$O-C$}} &
\raise-6pt\hbox{Observer} \\[-6pt]
2400000\,+ \\
\hline
51427.4094 & $\pm$0.0013 &  0.0&    0.0000& J. \v{S}af\'{a}\v{r} \\
51435.3488 & $\pm$0.0013 & 26.0& $-$0.0020& M. Zejda             \\
51449.3887 & $\pm$0.0023 & 72.0&    0.0012& J. \v{S}af\'{a}\v{r} \\
\hline
\end{tabular}
\end{center}
\end{table}

\IBVSTack{
Special thanks are due to Miloslav Zejda, who observed this object on my
request.}

\IBVSfig{8cm}{4819-f1.ps}

\reference

Gaspani, A., 1999, LANCELOT software, private communications

\end{document}
