Kepler-80

Kepler-80
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 44m 27s
Declination +39° 58′ 44″
Apparent magnitude (V) 14.804
Characteristics
Astrometry
Distance~1100 ly
(~357 pc)
Details
Mass0.730 M☉
Radius0.678 R☉
Luminosity0.170 L☉
Temperature4540 K
Metallicity [Fe/H]-0.56 [1] dex
Other designations
KOI-500

[2]

Kepler-80 is a star in the constellation Cygnus with five planets.[3]

Planetary system

The discovery of five planets orbiting the star was announced October 2012. The planets are unusual in that they orbit near the parent star. The semi-major axis of the outermost planet is 1/12 the distance from Earth to the Sun. Radial velocity method could not be used to confirm the existence of planets due to star's faintness. Outermost two planets were confirmed through transit-timing variation method while it was not possible with inner planets due to relatively low signal-to-noise ratio. Two of the three other candidates were validated in February 2014. The remaining candidate was expected to be a real planet although its period was too short to validate through criteria given to confirm the planet.[1][4][5] The innermost planet was validated in 2016. [6]

The Kepler-80 planetary system[1]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
f — 0.0175 0.987 ~0 81.36° 1.21 R⊕
d 6.75 M⊕ 0.0372 3.07 ~0 85.94° 1.53 R⊕
e 4.13 M⊕ 0.0491 4.64 ~0 86.52° 1.60 R⊕
b 6.93 M⊕ 0.0658 7.05 ~0 87.66° 2.67 R⊕
c 6.74 M⊕ 0.0792 9.52 ~0 87.66° 2.74 R⊕

[2]

References

  1. 1 2 3 "OASIS". Abstractsonline.com. Retrieved 2012-11-22.
  2. 1 2 MacDonald, Mariah G.; Ragozzine, Darin; Fabrycky, Daniel C.; Ford, Eric B.; Holman, Matthew J.; Isaacson, Howard T.; Lissauer, Jack J.; Lopez, Eric D.; Mazeh, Tsevi (2016-01-01). "A Dynamical Analysis of the Kepler-80 System of Five Transiting Planets". The Astronomical Journal. 152 (4): 105. doi:10.3847/0004-6256/152/4/105. ISSN 1538-3881.
  3. ↑ http://arxiv.org/abs/1208.3312
  4. ↑ "Tiny Alien Solar System Discovery Explained (Infographic) | KOI-500 Exoplanets, Kepler". Space.com. Retrieved 2012-11-22.
  5. ↑ http://www.nasa.gov/sites/default/files/files/arXivValidationMultisII.pdf
  6. ↑ http://www.nasa.gov/press-release/nasas-kepler-mission-announces-largest-collection-of-planets-ever-discovered
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