Kepler-277

Kepler-277 is a large yellow star about 961 ± 10 parsecs (3,134 ± 33 ly) away in the constellation of Lyra. It is 1.69 R_☉ and 1.12 M_☉, with a temperature of 5946 K, a metallicity of -0.315 [Fe/H], and an unknown age.^[3] For comparison, the Sun has a temperature of 5778 K, a metallicity of 0.00 [Fe/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 star.

Kepler-277

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Lyra[1]
Right ascension	19h 06m 19.95772s[2]
Declination	+39° 04′ 37.8616″[2]
Apparent magnitude (V)	13.544[3]
Characteristics
Evolutionary stage	Main sequence[citation needed]
Spectral type	G1V[citation needed]
Astrometry
Radial velocity (Rv)	−62.35±1.85[2] km/s
Proper motion (μ)	RA: 5.818 mas/yr[2] Dec.: 17.290 mas/yr[2]
Parallax (π)	1.0406±0.0106 mas[2]
Distance	3,130 ± 30 ly (961 ± 10 pc)
Absolute magnitude (MV)	3.39[citation needed]
Details[3]
Mass	1.1 M☉
Radius	1.83 R☉
Luminosity	0.57 L☉
Temperature	5914 K
Metallicity [Fe/H]	0.100 dex
Age	4.07 Gyr
Other designations
Kepler-277, KOI-1215, KIC 3939150, 2MASS J19061996+3904379[4]
Database references
SIMBAD	data

Planetary system

Kepler-277 hosts two exoplanets, detected in 2014 via the transit method.^[3] Named Kepler-277b and Kepler-277c, they are super-Earths, notable for their unusually high densities.^[5]

The Kepler-277 planetary system^[3]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	87.3+41.7 −39.9 M🜨	0.136	17.324	—	—	2.92+0.73 −0.63 R🜨
c	64.2+18.1 −15.7 M🜨	0.209	33.006	—	—	3.36+0.83 −0.72 R🜨

See also

• List of stars in Lyra