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Observation data
Epoch J2000      Equinox J2000
Constellation Lyra[1]
Right ascension  19h 06m 33.2143s[2]
Declination +39° 29′ 16.358″[2]
Apparent magnitude (V) 10.7[3]
Spectral type F[4]
Proper motion (μ) RA: −0.455±0.040[2] mas/yr
Dec.: 6.169±0.044[2] mas/yr
Parallax (π)4.0822 ± 0.0236[2] mas
Distance799 ± 5 ly
(245 ± 1 pc)
[5] M
Radius1.297±0.015[5] R
[5] L
Surface gravity (log g)4.275+0.007
[5] cgs
Temperature6270±79[6] K
Metallicity [Fe/H]−0.05±0.10[6] dex
Rotation23.147±0.039 days[7]
Rotational velocity (v sin i)11.2[3] km/s
[5] years
Other designations
KOI-244, KIC 4349452, TYC 3124-1264-1, 2MASS J19063321+3929164
Database references

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,.[8] With an apparent visual magnitude of 10.7,[3] 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[4]
(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. ^ Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
  2. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia Data Release 2 Vizier catalog entry
  3. ^ a b c Kepler-25b, NASA Ames Research Center, retrieved 2011-12-06
  4. ^ a b Schneider, Jean, "Star: Kepler-25", Extrasolar Planets Encyclopaedia, Paris Observatory, archived from the original on 2012-06-16, retrieved 2013-12-18
  5. ^ a b c d e Silva Aguirre, V.; et al. (2015). "Ages and fundamental properties of Kepler exoplanet host stars from asteroseismology". Monthly Notices of the Royal Astronomical Society. 452 (2): 2127–2148. arXiv:1504.07992. Bibcode:2015MNRAS.452.2127S. doi:10.1093/mnras/stv1388.
  6. ^ a b Huber, Daniel; et al. (2013). "Fundamental Properties of Kepler Planet-candidate Host Stars using Asteroseismology". The Astrophysical Journal. 767 (2). 127. arXiv:1302.2624. Bibcode:2013ApJ...767..127H. doi:10.1088/0004-637X/767/2/127.
  7. ^ 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:1308.1845. Bibcode:2013ApJ...775L..11M. doi:10.1088/2041-8205/775/1/L11.
  8. ^ "Kepler Discoveries". 2011-12-05.

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