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Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 51m 22.177s[1]
Declination +46° 34′ 27.38″[1]
Apparent magnitude (V) 16.0[2]
Spectral type M1V[3]
Proper motion (μ) RA: -8[4] mas/yr
Dec.: 20[4] mas/yr
Mass 0.58±0.05[2] M
Radius 0.53±0.04[2] R
Surface gravity (log g) 4.64[3] cgs
Temperature 3900±200[2] K
Metallicity [Fe/H] 0.00 dex
Rotation 36.220±0.256 days[5]
Other designations
KIC 9787239, KOI-952, 2MASS J19512217+4634273[3]
Database references
KIC data

Kepler-32 is an M-type main sequence star located about 1300 light years from Earth, in the constellation of Cygnus. Discovered in January 2012 by the Kepler spacecraft,[6] 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.[7] 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.[8] 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.[9]

Planetary system[edit]

The Kepler-32 planetary system[10]
(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. ^ a b Cutri, R. M. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. Bibcode:2003yCat.2246....0C. 
  2. ^ a b c d "Notes on Kepler-32 b". Retrieved 21 January 2017. 
  3. ^ a b c "KOI-952". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 21 January 2017. 
  4. ^ a b Kepler Mission Team (2009). "VizieR Online Data Catalog: Kepler Input Catalog". VizieR On-line Data Catalog. Bibcode:2009yCat.5133....0K. 
  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:1308.1845Freely accessible. Bibcode:2013ApJ...775L..11M. doi:10.1088/2041-8205/775/1/L11. 
  6. ^ NBC. "100 billion alien planets fill our galaxy: study". NBC News. Retrieved 28 February 2013. 
  7. ^ 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:1301.0023Freely accessible. Bibcode:2013ApJ...764..105S. doi:10.1088/0004-637X/764/1/105. 
  8. ^ The Extrasolar Planet Encyclopedia. "Kepler-32". Archived from the original on 3 February 2014. Retrieved 28 February 2013. 
  9. ^ 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:1201.5415Freely accessible. Bibcode:2012ApJ...750..114F. doi:10.1088/0004-637X/750/2/114. 
  10. ^ NASA Exoplanet Archive--Planet Host Overview page:Kepler-32


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