Kepler-51

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, Kepler-51c and Kepler-51d 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]

Kepler-51
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 19h 45m 55.14297s[1]
Declination +49° 56′ 15.6506″[1]
Characteristics
Spectral type G[2]
Astrometry
Radial velocity (Rv)−4.3[3] km/s
Proper motion (μ) RA: +0.006[1] mas/yr
Dec.: −7.458[1] mas/yr
Parallax (π)1.2473 ± 0.0217[1] mas
Distance2,610 ± 50 ly
(800 ± 10 pc)
Details[4]
Mass0.99±0.03 M☉
Radius0.92+0.05
−0.03 R☉
Surface gravity (log g)4.51+0.03
−0.04 cgs
Temperature5,662+64
−65 K
Metallicity [Fe/H]+0.04±0.04 dex
Rotational velocity (v sin i)5.5±1.0[3] km/s
Age2.14+4.62
−1.16 Gyr
Other designations
KOI-620[5]
Database references
SIMBADdata

Planets
The Kepler-51 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 0.007 MJ 0.2514 45.154 — — 0.633 RJ
c 0.013 MJ 0.384 85.312 — — 0.803 RJ
d 0.024 MJ 0.509 130.194 — — 0.865 RJ

Kepler-51 has three planets, all super-puffs. Kepler-51b, c and d have some of the lowest known densities of any exoplanet.

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Libby-Roberts, Jessica E.; et al. (October 28, 2019). "The Featureless Transmission Spectra of Two Super-Puff Planets". arXiv:1910.12988. Cite journal requires |journal= (help)
  3. Petigura, Erik A.; et al. (September 2017). "The California-Kepler Survey. I. High-resolution Spectroscopy of 1305 Stars Hosting Kepler Transiting Planets". The Astronomical Journal. 154 (3): 20. arXiv:1703.10400. Bibcode:2017AJ....154..107P. doi:10.3847/1538-3881/aa80de. 107.
  4. Johnson, John Asher; et al. (September 2017). "The California-Kepler Survey. II. Precise Physical Properties of 2025 Kepler Planets and Their Host Stars". The Astronomical Journal. 154 (3): 9. arXiv:1703.10402. Bibcode:2017AJ....154..108J. doi:10.3847/1538-3881/aa80e7. 108.
  5. "KOI-620". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-08.

Further reading
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