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Artist's impression of the planet Kepler-78b around Kepler-78
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension  19h 34m 58.0143s[1]
Declination +44° 26′ 53.961″[1]
Apparent magnitude (V) 11.72[2]
Spectral type late G[3]
Proper motion (μ) RA: 37.807±0.973[1] mas/yr
Dec.: −16.348±0.696[1] mas/yr
Parallax (π)8.02 ± 0.25[1] mas
Distance410 ± 10 ly
(125 ± 4 pc)
Mass0.81±0.05 M
Temperature5089±50 K
Metallicity [Fe/H]−0.14±0.08 dex
Other designations
Kepler-78, KIC 8435766, TYC 3147-188-1, 2MASS J19345800+4426539
Database references

Kepler-78 (formerly known as KIC 8435766) is a 12th magnitude star in the constellation Cygnus.[2] This star has a radius of about 74% of the Sun, and a temperature of about 5100 K.

Planetary system[edit]

Kepler-78 planetary system is composed by one planet called Kepler-78b, a planet slightly bigger than Earth with an extremely close orbit to the parent star. The orbital period of this planet is about 8.5 hours because of its proximity to its star. While it has a similar density to the Earth (at 5.57 g/cm3, its surface temperature is about 1300 to 1500 K.[5]

The Kepler-78 planetary system[5]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 1.86+0.38
0.0089 0.3550 ± 0.0004 0 79+9


  1. ^ a b c d e Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512.Gaia Data Release 1 catalog entry
  2. ^ a b "Kepler-78". SIMBAD. Centre de données astronomiques de Strasbourg.
  3. ^ Sanchis-Ojeda, Roberto; et al. (2013). "Transits and Occultations of an Earth-sized Planet in an 8.5 hr Orbit". The Astrophysical Journal. 774. 54. arXiv:1305.4180. Bibcode:2013ApJ...774...54S. doi:10.1088/0004-637X/774/1/54.
  4. ^ "Notes on Kepler-78 b". Retrieved 9 January 2017.
  5. ^ a b Pepe, Francesco; Cameron, Andrew Collier; Latham, David W.; Molinari, Emilio; Udry, Stéphane; Bonomo, Aldo S.; Buchhave, Lars A.; Charbonneau, David; Cosentino, Rosario; Dressing, Courtney D.; Dumusque, Xavier; Figueira, Pedro; Fiorenzano, Aldo F. M.; Gettel, Sara; Harutyunyan, Avet; Haywood, Raphaëlle D.; Horne, Keith; Lopez-Morales, Mercedes; Lovis, Christophe; Malavolta, Luca; Mayor, Michel; Micela, Giusi; Motalebi, Fatemeh; Nascimbeni, Valerio; Phillips, David; Piotto, Giampaolo; Pollacco, Don; Queloz, Didier; Rice, Ken; et al. (2013). "An Earth-sized planet with an Earth-like density". Nature. 503 (7476): 377. arXiv:1310.7987. Bibcode:2013Natur.503..377P. doi:10.1038/nature12768. PMID 24172902.