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Kepler-32 is an M1V dwarf-type star located 1301.1 light years from Earth, in the constellation of Cygnus. Discovered in January 2012 by the Kepler spacecraft,[1] it shows a 0.58 ± 0.05 solar mass (M), a 0.53 ± 0.04 solar radius (R), and temperature of 3900.0 K, making it half the mass and radius of the Sun, two-thirds its temperature and 5% its luminosity.[2] It initially was known to have at least 2 planets orbiting around it, the smaller Kepler-32b, orbiting its parent star every 5.90124 days, and Kepler-32c with an orbital period of 8.7522 days.[3] In April 2013, transit-timing variation analysis confirmed 3 other planets to be in the system. However, only very loose constraints of the maximum mass of the planets could be determined.[4]

Planetary system[edit]

The Kepler-32 planetary system[5]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
f 0.013 0.742956 0.81±0.05 R
e 0.033 2.896009 1.5±0.1 R
b < 4.1 MJ 0.05 5.90124 2.2±0.2 R
c < 0.5 MJ 0.09 8.7522 2.0±0.2 R
d 0.129 22.780806 2.7±0.1 R


  1. ^ NBC. "100 billion alien planets fill our galaxy: study". NBC News. Retrieved 28 February 2013. 
  2. ^ Swift, Jonathan J. (2012). "Characterizing the Cool KOIs IV: Kepler-32 as a prototype for the formation of compact planetary systems throughout the Galaxy". The Astrophysical Journal 764: 105. arXiv:1301.0023. Bibcode:2013ApJ...764..105S. doi:10.1088/0004-637X/764/1/105. 
  3. ^ The Extrasolar Planet Encyclopedia. "Kepler-32". Retrieved 28 February 2013. 
  4. ^ Fabrycky, Daniel C.; et al. (2012). "Transit Timing Observations from Kepler: IV. Confirmation of 4 Multiple Planet Systems by Simple Physical Models". The Astrophysical Journal 750 (2): 114. arXiv:1201.5415. Bibcode:2012ApJ...750..114F. doi:10.1088/0004-637X/750/2/114. 
  5. ^ NASA Exoplanet Archive--Planet Host Overview page:Kepler-32


Coordinates: Sky map 19h 51m 22s, +46° 34′ 27″