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Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus[1]
Right ascension 19h 00m 57.810s
Declination +46° 40′ 05.62″
Apparent magnitude (V) 13.96[2]
Spectral type G0V~G0IV[3]
Distance 6271[3] ly
(1950 pc)
Mass 1.32±0.09[2] M
Radius 1.42±0.07[2] R
Luminosity [2] L
Temperature 6041±123[2] K
Metallicity [Fe/H] 0.33±0.11[2] dex
Rotation 12.851±0.053 days[4]
Rotational velocity (v sin i) 5.5±1.5[2] km/s
Other designations
Kepler-43, KOI-135, KIC 9818381
Database references
Extrasolar Planets
KIC data

Kepler-43,formerly known as KOI-135, is a star in the northern constellation of Cygnus. It is located at the celestial coordinates: Right Ascension 19h 00m 57.810s}, Declination +46° 40′ 05.62″.[5] With an apparent visual magnitude of 13.996,[2] this star is too faint to be seen with the naked eye.

Planetary system[edit]

The Kepler spacecraft detected a transiting planet candidate around this star that was confirmed by radial velocity measurements taken by the SOPHIE spectrograph mounted on the 1.93 m telescope at the Haute-Provence Observatory.[6]

The Kepler-43 planetary system[3]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 3.23±0.19 MJ 0.0449 3.024095


  1. ^ "Cygnus – constellation boundary", The Constellations, International Astronomical Union, retrieved 2011-12-15 
  2. ^ a b c d e f g h Kepler-43b, NASA Ames Research Center, retrieved 2011-12-06 
  3. ^ a b c Schneider, Jean, "Star: Kepler-43", Extrasolar Planets Encyclopaedia, Paris Observatory, archived from the original on 2014-03-04, retrieved 2011-12-06 
  4. ^ McQuillan, A.; Mazeh, T.; Aigrain, S. (2013). "Stellar Rotation Periods of The Kepler objects of Interest: A Dearth of Close-In Planets Around Fast Rotators". The Astrophysical Journal Letters. 775 (1). L11. arXiv:1308.1845Freely accessible. Bibcode:2013ApJ...775L..11M. doi:10.1088/2041-8205/775/1/L11. 
  5. ^ "Kepler Discoveries". 2011-12-05. 
  6. ^ Bonomo, A. S.; et al. (2012). "SOPHIE velocimetry of Kepler transit candidates. V. The three hot Jupiters KOI-135b, KOI-204b, and KOI-203b (alias Kepler-17b)". Astronomy and Astrophysics. 538. A96. arXiv:1110.5462Freely accessible. Bibcode:2012A&A...538A..96B. doi:10.1051/0004-6361/201118323. 

Coordinates: Sky map 19h 00m 57.810s, +46° 40′ 05.62″