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 | 1.83166 R☉ |
Luminosity | 0.5679111 L☉ |
Temperature | 5914 K |
Metallicity [Fe/H] | 0.100 dex |
Age | 4.07 Gyr |
Other designations | |
Kepler-277 is a large yellow star about 961 ± 10 parsecs (3,134 ± 33 ly) 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.
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🜨 |
Kepler-277b (KOI-1215.01) is the second most massive and third-largest rocky planet ever discovered,[ improper synthesis?] with a mass close to that of Saturn. It was discovered in 2014. Kepler-277b orbits close to its host star, with one orbit lasting 17.324 days. [3]
Kepler-277c (KOI-1215.02) is the third most massive and second-largest rocky planet ever discovered,[ improper synthesis?] with a mass about 64 times that of Earth. It was discovered in 2014. Kepler-277c orbits close to its host star, with one orbit lasting 33.006 days. [3]