Kepler-51
Kepler-51 is a Sun-like star that is about 500 million years old. It is orbited by three super-puff planets—Kepler-51b, c, and d—which have the lowest known densities of any known exoplanet. The planets 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.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 45m 55.1428629445s |
| Declination | +49° 56′ 15.650520690″ |
| Characteristics | |
| Spectral type | G |
| 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 | 0.985±0.012 M☉ |
| Radius | 0.881±0.011 R☉ |
| Luminosity | 0.66 L☉ |
| Surface gravity (log g) | 4.51+0.03 −0.04 cgs |
| Temperature | 5,662+64 −65 K |
| Metallicity [Fe/H] | +0.04±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 |
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