Imaginary Picture of Kepler-442 b
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Exoplanet Name : Kepler-442 b
Alternate Name :
Radius (Rjup / Re): 0.1200 (Rjup) 1.3451 (Rearth)
Mass (Mjup / Me): 0.0090 (Mjup) 2.8559 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.4090 (AU) 0.4090 (AU Est.)
Eccentricity : 0.0400
Orbital Period(Yrs) 0.3075
Orbital Period(Observed/Estimated) 112.31 (Days Obs.) 122.42 (Days Est.)
Star Radiation at Atmospheric Boundary: 1117.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 258.0 (K)
Blackbody T 0.3(K) 242.3 (K)
Blackbody T 0.7(K) 196.1 (K)
Tidally Locked Blackbody T 0.1(K) 306.8 (K)
Tidally Locked Blackbody T 0.3(K) 288.2 (K)
Size Class: super-Earth-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Habitable
Habitability by Kopparapu: Habitable
Star Name : Kepler-442
Alternate Name :
Star Distance(LY) : 1193.3
Stellar Radius(Rsun) : 0.6 (Rsun Measured)
Stellar Mass(Msun) : 0.6 (Msun Measured) 0.7 (Msun Estimated)
Star Age : 2.9 (GY)
Temperature : 4402 (K)
Spectral type : K5
Metalicity : -0.4
Absolute Magnitude: 7.5
Apparent Magnitude: 15.3
Right Ascension(RA) 285.3667
Declination (DEC) 39.2800
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Guillermo Torres, David M. Kipping, Francois Fressin, Douglas A. Caldwell, Joseph D. Twicken, Sarah Ballard, Natalie M. Batalha, Stephen T. Bryson, David R. Ciardi, Christopher E. Henze, Steve B. Howell, Howard T. Isaacson, Jon M. Jenkins, Philip S. Muirhead, Elisabeth R. Newton, Erik A. Petigura, Thomas Barclay, William J. Borucki, Justin R. Crepp, Mark E. Everett, Elliott P. Horch, Andrew W. Howard, Rea Kolbl, Geoffrey W. Marcy, Sean McCauliff, Elisa V. Quintana"
Discovery Paper - Title Validation of Twelve Small Kepler Transiting Planets in the Habitable Zone
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-442+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-442%20b/
Kepler-442 b
Kepler-442 b

  • Kepler-442 b is an exoplanet orbiting the star Kepler-442, located about 1193.3 light-years (365.9 pc) away from Solar System. Its discovery was publicly announced on 2015.
  • The host star Kepler-442 has apparent magnitude of 15.3, with absolute magnitude of 7.5.
  • It is 0.6 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 4402 with its spectral types of K5
  • In this planetary system, the extrasolar planet Kepler-442 b orbits around the star Kepler-442 every 112.3 days with its orbital distance of 0.41 AU ( 61185529.1 km)
  • (Projected orbit of Kepler-442 b around its host star Kepler-442)


  • The Star Kepler-442 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.267 AU ( 40003466.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.370 AU ( 55295244.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.563 AU ( 84257715.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.829 AU ( 123988919.1 km)
  • Radiation at Planetary Boundary of Kepler-442 b : 1116.96 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-442)



  • Kopparapu Recent Venus for Star Kepler-442 distance : 0.296 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-442 distance : 0.375 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-442 distance : 0.362 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-442 distance : 0.398 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-442 distance : 0.698 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-442 distance : 0.736 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-442)



  • Original Kopparapu Recent Venus for Star Kepler-442 distance : 0.292 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-442 distance : 0.387 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-442 distance : 0.387 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-442 distance : 0.709 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-442 distance : 0.738 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-442)



    (Position in Stellar Map of star Kepler-442 and its Exoplanet Kepler-442 b)



    (Zoomed position in Stellar Map of star Kepler-442 and its Exoplanet Kepler-442 b (zoom level 3))