Kepler-51 is a Sun-like star that is only 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 exoplanet. The planets are all Jupiter-sized but with masses only a few times Earth's.[2]
Observation data Epoch J2000.0 Equinox J2000.0 | |
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Constellation | Cygnus |
Right ascension | 19h 45m 55.1428629445s[1] |
Declination | +49° 56′ 15.650520690″[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 |
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]
Constellation of Cygnus | |||||||||||
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