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Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus[1]
Right ascension  19h 31m 29.4967s[2]
Declination +41° 03′ 51.356″[2]
Apparent magnitude (V) 16.88[3]
Spectral type M1 V[4]
Proper motion (μ) RA: 4.635±0.071[2] mas/yr
Dec.: −21.579±0.083[2] mas/yr
Parallax (π)2.5904 ± 0.0434[2] mas
Distance1,260 ± 20 ly
(386 ± 6 pc)
Mass0.59 ± 0.06[5] M
Radius0.55 ± 0.11[5] R
Temperature3820 ± 90[5] K
Metallicity [Fe/H]0.13 ± 0.13[5] dex
Other designations
Kepler-45, KOI-254, KIC 5794240, 2MASS J19312949+4103513
Database references

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″.[6] With an apparent visual magnitude of 16.88,[4] this star is too faint to be seen with the naked eye.

The Kepler-45 planetary system[7]
(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 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. ^ "Kepler-45". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 28 January 2018.
  4. ^ a b Muirhead, Philip S.; Hamren, Katherine; Schlawin, Everett; Rojas-Ayala, Bárbara; Covey, Kevin R.; et al. (May 2012). "Characterizing the Cool Kepler Objects of Interests. New Effective Temperatures, Metallicities, Masses, and Radii of Low-mass Kepler Planet-candidate Host Stars". The Astrophysical Journal Letters. 750 (2). L37. arXiv:1109.1819. Bibcode:2012ApJ...750L..37M. doi:10.1088/2041-8205/750/2/L37.
  5. ^ a b c d Kepler-45b, NASA Ames Research Center, retrieved 2011-12-06
  6. ^ "Kepler Discoveries". 2011-12-05.
  7. ^ Schneider, Jean, "Star: Kepler-45", Extrasolar Planets Encyclopaedia, Paris Observatory, archived from the original on 2014-03-04, retrieved 2011-12-06

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