HAT-P-15

HAT-P-15 is a G-type main-sequence star about 630 light-years away. The star is older than Sun yet has a concentration of heavy elements roughly 190% of solar abundance. The star has no noticeable starspot activity.

The spectroscopic survey in 2015 have failed to find any stellar companions to it, yet imaging survey have identified a possibly two companion red dwarf stars at projected separations 1210 and 1370 AU, respectively.

The star was named Berehynia in December 2019 by Ukrainian amateur astronomers.

Planetary system
In 2010 a transiting hot superjovian planet b (named Tryzub in 2019 ) was detected. It has an equilibrium temperature of 904$14.233$ K. An orbital simulation shows that any planets inward of the orbit of b would spiral inward and be destroyed within a time-span of less than a billion years. The planetary orbit is well aligned with the equatorial plane of the star, misalignment equal to 13$−9.407$ degrees.