Kepler-277 is a large yellow star about away in the constellation of

Lyra , from ; pronounced: ) is a small constellation. It is one of the 48 listed by the 2nd century astronomer Ptolemy, and is one of the modern 88 constellations recognized by the International Astronomical Union. Lyra was often represented on star ...

. It is 1.69 and 1.12 , with a temperature of 5946 K, a metallicity of -0.315 e/H and an unknown age. For comparison, the Sun has a temperature of 5778 K, a metallicity of 0.00 e/H 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 A subgiant is a star that is brighter than a normal main-sequence star of the same spectral class, but not as bright as giant stars. The term subgiant is applied both to a particular spectral luminosity class and to a stage in the evolution ...

star.

Planetary system

Kepler-277 hosts two exoplanets, detected in 2014 via the

transit method Methods of detecting exoplanets usually rely on indirect strategies – that is, they do not directly image the planet but deduce its existence from another signal. Any planet is an extremely faint light source compared to its parent star. For e ...

. Named

Kepler-277b Kepler-277b (also known by its Kepler Objects of Interest designation KOI-1215.01) is the second most massive and third-largest rocky planet ever discovered, with a mass close to that of Saturn. Discovered in 2014 by the Kepler Space Telescope, Ke ...

and

Kepler-277c Kepler-277c (also known by its Kepler Objects of Interest designation KOI-1215.02) is the third most massive and second-largest rocky planet ever discovered, with a mass about 64 times that of Earth. Discovered in 2014 by the Kepler Space Telescope ...

, they are super-Earths, notable for their unusually high densities.

References

{{Stars of Lyra Subgiant stars Lyra Planetary transit variables Planetary systems with two confirmed planets J19061996+3904379 1215

Planetary system

See also

References