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A diagram of the Kepler-25 System, compared to our Inner Solar System.
Observation data
Epoch J2000      Equinox J2000
Constellation Lyra[1]
Right ascension 19h 06m 33.2204s
Declination +39° 29′ 16.321″
Apparent magnitude (V) 10.7[2]
Spectral type F[3]
Distance 782.7[3] ly
(240 pc)
Mass 1.22[2] M
Radius 1.36[2] R
Luminosity 1.36[2] L
Temperature 6190[2] K
Metallicity [Fe/H] 0.01[2] dex
Rotational velocity (v sin i) 11.2[2] km/s
Other designations

Kepler-25 is a star in the northern constellation of Lyra. It is located at the celestial coordinates: Right Ascension 19h 06m 33.2204s Declination +39° 29′ 16.321″ 19h 21m 39.0s,.[4] With an apparent visual magnitude of 10.7,[2] this star is too faint to be seen with the naked eye.

In 2012, two planets were found transiting the star. These planets were confirmed through transit-timing variation method. A third planet was discovered through follow-up radial velocity measurements which was confirmed in January 2014.

The Kepler-25 planetary system[3]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b <12.7 MJ 0.068 6.2385 2.58 R
c <4.16 MJ 0.11 12.7204 4.48 R
d 0.283 MJ 123


  1. ^ "Lyra – constellation boundary", The Constellations, International Astronomical Union, retrieved 2011-12-15 
  2. ^ a b c d e f g h Kepler-25b, NASA Ames Research Center, retrieved 2011-12-06 
  3. ^ a b c Schneider, Jean, "Star: Kepler-25", Extrasolar Planets Encyclopaedia, Paris Observatory, retrieved 2013-12-18 
  4. ^ "Kepler Discoveries". 2011-12-05. 

Coordinates: Sky map 19h 06m 33.2204s, +39° 29′ 16.321″