Kepler-51
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 45m 55.14s |
| Declination | +49° 56′ 15.65″ |
| Apparent magnitude (V) | 15.0 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | G4 |
| Astrometry | |
| Radial velocity (Rv) | −4.3 km/s |
| Proper motion (μ) | RA: 0.075±0.020 mas/yr Dec.: −7.451±0.019 mas/yr |
| Parallax (π) | 1.2457±0.0165 mas |
| Distance | 2,620 ± 30 ly (800 ± 10 pc) |
| Details | |
| Mass | 0.96±0.02 M☉ |
| Radius | 0.87±0.02 R☉ |
| Luminosity | 0.69 L☉ |
| Surface gravity (log g) | 4.7±0.1 cgs |
| Temperature | 5,670±60 K |
| Metallicity [Fe/H] | +0.05±0.04 dex |
| Rotational velocity (v sin i) | 5.5±1.0 km/s |
| Age | 500±250 Myr |
| Other designations | |
| KOI-620 | |
| Database references | |
| SIMBAD | data |
Kepler-51 is a Sun-like star that is about 500 million years old. It is orbited by four planets—Kepler-51b, c, d and e—first three of which are super-puffs and have the lowest known densities of any known exoplanet. The transiting planets in the system (b, c and d) are similar in radius to gas giants like Jupiter, but have unusually small masses for their size, only a few times greater than Earth's.