KELT-6, also known as BD+31 2447, is a star in the constellation Coma Berenices. With an apparent magnitude of 10.34, it is impossible to see with the unaided eye, but can be seen with a powerful telescope. The star is located 791 light years away from the Solar System based on parallax, but is drifting away with a radial velocity of 1.62 km/s.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Coma Berenices |
Right ascension | 13h 03m 55.65s[1] |
Declination | +30° 38′ 24.28″[1] |
Apparent magnitude (V) | 10.34±0.05[2] |
Characteristics | |
Spectral type | F8IV-V[2] |
Astrometry | |
Radial velocity (Rv) | 1.62±0.27[1] km/s |
Proper motion (μ) | RA: −5.106±0.052 mas/yr[1] Dec.: +15.640±0.046 mas/yr[1] |
Parallax (π) | 4.1255 ± 0.0338 mas[1] |
Distance | 791 ± 6 ly (242 ± 2 pc) |
Details | |
Mass | 1.13±0.06[3] M☉ |
Radius | 1.53±0.14[3] R☉ |
Luminosity | 3.25+0.94 −0.81[2] L☉ |
Surface gravity (log g) | 4.07±0.06[4] cgs |
Temperature | 6,272±61[3] K |
Metallicity [Fe/H] | -0.28[4] dex |
Rotational velocity (v sin i) | 4.53±0.26[5] km/s |
Age | 4.9+0.7 −0.5[3] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
KELT-6 is an F-type star that is 13% more massive and 53% larger than the Sun. It radiates at 3.25 times the Sun's luminosity from its photosphere at an effective temperature of 6,727 K. KELT-6 has a projected rotational velocity of 4.53 km/s, and is slightly older than the Sun, with an age of 4.9 billion years. Unlike most host stars of exoplanets, it has a poor metallicity, with 52.5% the abundance of heavy metals compared to the Sun.
In 2013, a long period "hot Jupiter" was discovered orbiting the star using the transit method.[2] Another planet was discovered in 2015 using radial velocity (Doppler spectroscopy) method.[5]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 0.44±0.02[3] MJ | 0.08±0.00[3] | 7.85±0.00[3] | 0.22±0.11[4] | 88.81±0.85[4]° | 1.18±0.11[3] RJ |
c | 3.71±0.21[5] MJ | 2.39±0.11[5] | 1,276+81 −67[5] |
0.21±0.04[5] | — | — |