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A diagram of the Kepler-45 System, compared to our Inner Solar System.
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus[1]
Right ascension 19h 31m 29.495s
Declination +41° 03′ 51.37″
Apparent magnitude (V) 15[2]
Spectral type M0V[3]
Distance 1086[3] ly
(333 pc)
Mass 0.59±0.06[2] M
Radius 0.55±0.11[2] R
Luminosity [2] L
Temperature 3820±90[2] K
Metallicity [Fe/H] 0.13±0.13[2] dex
Rotational velocity (v sin i) [2] km/s
Age [2] Gyr
Other designations

Kepler-45, formerly known as KOI-254, is a star in the northern constellation of Cygnus. It is located at the celestial coordinates: Right Ascension 19h 31m 29.495s, Declination +41° 03′ 51.37″.[4] With an apparent visual magnitude of 16,[2] this star is too faint to be seen with the naked eye.

The Kepler-45 planetary system[3]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 0.5505 MJ 0.030 2.455239 11 R


  1. ^ "Cygnus – constellation boundary", The Constellations, International Astronomical Union, retrieved 2011-12-15 
  2. ^ a b c d e f g h i Kepler-45b, NASA Ames Research Center, retrieved 2011-12-06 
  3. ^ a b c Schneider, Jean, "Star: Kepler-45", Extrasolar Planets Encyclopaedia (Paris Observatory), retrieved 2011-12-06 
  4. ^ "Kepler Discoveries". 2011-12-05. 

Coordinates: Sky map 19h 31m 29.495s, +41° 03′ 51.37″