ZZ Boötis
ZZ Boötis is a star system in the constellation Boötes. It varies from magnitude 6.79 to 7.44 over 5 days. Based on its parallax, measured by the Gaia spacecraft, it is about 350 light-years away.In 1950 Grigory Shajn determined that this star is a double lined spectroscopic binary with, with an approximate period of 4.96 days. Sergei Gaposchkin found from an examination of photographic plates, in 1951, that it was an Algol type eclipsing binary system. The primary and secondary eclipses are of equal depth, 0.65 magnitudes, meaning the brightness drops by nearly half. The eclipses make up only 6% of the orbital period.
ZZ Boötis is a binary star system, specifically an eclipsing binary. The component stars appear to be of almost equal mass, differing by only 3%.
