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Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus[1]
Right ascension  19h 28m 32.8905s[2]
Declination +42° 25′ 45.959″[2]
Apparent magnitude (V) 15.306[3]
Spectral type M0V[4]
Proper motion (μ) RA: −0.488±0.042[2] mas/yr
Dec.: 11.692±0.042[2] mas/yr
Parallax (π)2.2527 ± 0.0241[2] mas
Distance1,450 ± 20 ly
(444 ± 5 pc)
Mass0.75[3] M
Radius0.70[3] R
Luminosity[3] L
Temperature4590[3] K
Metallicity [Fe/H]0.34[3] dex
Rotation17.951±0.016 days[5]
Rotational velocity (v sin i)0.6[3] km/s
Other designations
KOI-870, KIC 6949607, 2MASS J19283288+4225459
Database references

Kepler-28 is a star in the northern constellation of Cygnus., It is orbited by two exoplanets. It is located at the celestial coordinates: Right Ascension  19h 28m 32.887s, Declination +42° 25′ 45.91″.[6] With an apparent visual magnitude of 15.036,[3] this star is too faint to be seen with the naked eye.

The Kepler-28 planetary system[7]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 1.51 MJ 0.062 5.9123
c 1.36 MJ 0.081 8.9858


  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 DR2 record for this source at VizieR.
  3. ^ a b c d e f g h Kepler-28b, NASA Ames Research Center, retrieved 2011-12-06
  4. ^ "Kepler-28". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 10 January 2017.
  5. ^ 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.
  6. ^ "Kepler Discoveries". 2011-12-05.
  7. ^ Schneider, Jean, "Star: Kepler-28", Extrasolar Planets Encyclopaedia, Paris Observatory, archived from the original on 2012-04-26, retrieved 2011-12-06

Coordinates: Sky map 19h 28m 32.887s, +42° 25′ 45.91″