| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h45m 55.14s[1] |
| Declination | +49° 56′ 15.65″[1] |
| Characteristics | |
| Spectral type | G[2] |
| Astrometry | |
| Radial velocity (Rv) | −4.3[3] km/s |
| Proper motion (μ) | RA: 0.075±0.020[1] mas/yr Dec.: −7.451±0.019[1] mas/yr |
| Parallax (π) | 1.2457 ± 0.0165 mas[1] |
| Distance | 2,620 ± 30 ly (800 ± 10 pc) |
| Details[4][2] | |
| Mass | 0.985±0.012 M☉ |
| Radius | 0.881±0.011 R☉ |
| Luminosity | 0.66[5] 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[3] km/s |
| Age | 500±250 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Kepler-51 is a Sun-like star that is about 500 million years old.[2] 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.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 3.69+1.86 −1.59 M🜨 |
0.2514±0.0097 | 45.1542±0.0003 | 0.03±0.01 | 89.78+0.15 −0.17° |
6.89±0.14 R🜨 |
| c | 4.43±0.54 M🜨 | 0.384±0.015 | 85.3139±0.0017 | 0.01+0.02 −0.01 |
— | 8.98±2.84 R🜨 |
| d | 5.70±1.12 M🜨 | 0.509±0.020 | 130.1845±0.0007 | 0.01±0.01 | 89.91+0.06 −0.08° |
9.46±0.16 R🜨 |
Kepler-51 has three planets, all super-puffs. Kepler-51b, c and d have some of the lowest known densities of any exoplanet.[2]
 | This main-sequence-star-related article is a stub. You can help Wikipedia by expanding it. |
