Determination of characteristics of newly discovered eclipsing binary
  2MASS J18024395 +4003309 = VSX J180243.9+400331
  During processing the observations of the intermediate polar 1RXS
J180340.0+401214, obtained 26.05.2012 at the 60-cm telescope of the Mt. Suhora
observatory (Krakow, Poland), variability of 2MASS J18024395+4003309 was
discovered. As this object was not listed in the "General Catalogue of Variable
Stars" or "Variable Stars Index", we registered it as VSX J180243.9+400331.
Additionally we used 189 separate observations from the Catalina Sky Survey
spread over 7 years. The periodogram analysis yields the period of
0d.3348837{\pm}0d.0000002.The object was classified as the Algol-type eclipsing
binary with a strong effect of ellipticity. The depths of the primary and
secondary minima are nearly identical, which corresponds to a brightness (and
maybe) mass ratio close to 1. The statistically optimal degree of the
trigonometric polynomial n=4. The most recent minimum occurred at HJD
2456074.4904. The brightness range from our data is 16.56-17.52 (V),
16.18-17.08 (R). The NAV ("New Algol Variable") algorithm was applied for
statistically optimal phenomenological modeling and determination of
corresponding parameters.
