The newly discovered eclipsing cataclysmic star 2MASS J16211735 + 4412541 and its peculiarity

•We present multicolor observations of the newly discovered, eclipsing cataclysmic star 2MASS J16211735 + 4412541.•Its main peculiarity is the big increasing of eclipse depth during outburst.•It was reproduced by a flat disc whose size and temperature are considerably bigger than those of the primary at quiescence.

We present our observations of the newly discovered, eclipsing cataclysmic star 2MASS J16211735 + 4412541 carried out two weeks after its outburst at the beginning of June 2016. Its main peculiarity is the big increasing of eclipse depth during outburst. We qualitatively modelled the folded light curves at quiescence and outburst in order to explain the reason for increase of the primary luminosity about two hundred times. The light curve fits revealed that such an effect can be reproduced by a flat disc whose radius and temperature are several times bigger than those of the primary at quiescence.