Kepler-277

Kepler-277 is a large yellow star about away in the constellation of Lyra. It is 1.69 and 1.12, with a temperature of 5946 K, a metallicity of -0.315, and an unknown age. For comparison, the Sun has a temperature of 5778 K, a metallicity of 0.00, and an age of about 4.5 billion years. The large radius in comparison to its mass and temperature suggest that Kepler-277 could be a subgiant star.

Planetary system

Kepler-277 hosts two exoplanets, detected in 2014 via the transit method. Named Kepler-277b and Kepler-277c, they are super-Earths, notable for their unusually high estimated masses and densities. A 2025 study speculated that additional, undetected non-transiting planets may bias the transit-timing variation analysis used to estimate the planets' masses.