HAT-P-7
HAT-P-7 is a triple star system located about 1,088 light-years away in the constellation Cygnus. The apparent magnitude of this star is 10.5, which means it is not visible to the naked eye but can be seen with a small telescope on a clear dark night.
Stellar system
The primary component of the HAT-P-7 system is an F-type main-sequence star with around 1.35 times the Sun's mass and twice the Sun's radius, hosting one known planet. The secondary is a red dwarf located 730 astronomical units away from the primary, with a spectral type of M5.5V and a mass of. The tertiary is also a red dwarf with a mass of at least ; it is in a highly-eccentric orbit with a semi-major axis of 32 AU.The secondary star, component B, was discovered in 2012. Another companion was suspected based on long-period radial velocity variations, but its nature was unknown until 2025, when it was found to be a third star.
Component B has also been referred to as HAT-P-7 East. HAT-P-7 West is another candidate companion, of spectral type M9V or L0V, but it is not confirmed to be associated with the system and is likely an unrelated background star.