Imaginary Picture of Kepler-446 b
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Exoplanet Name : Kepler-446 b
Alternate Name :
Radius (Rjup / Re): 0.1340 (Rjup) 1.5020 (Rearth)
Mass (Mjup / Me): 0.0140 (Mjup) 4.4511 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0159 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0043
Orbital Period(Observed/Estimated) 1.57 (Days Obs.) 0.00 (Days Est.)
Star Radiation at Atmospheric Boundary: 35443.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 612.4 (K)
Blackbody T 0.3(K) 575.1 (K)
Blackbody T 0.7(K) 465.3 (K)
Tidally Locked Blackbody T 0.1(K) 728.3 (K)
Tidally Locked Blackbody T 0.3(K) 683.9 (K)
Size Class: super-Earth-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Theoretical
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : Kepler-446
Alternate Name :
Star Distance(LY) : 391.4
Stellar Radius(Rsun) : 0.2 (Rsun Measured)
Stellar Mass(Msun) : 0.2 (Msun Measured) 0.2 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3359 (K)
Spectral type : M5
Metalicity : -0.3
Absolute Magnitude: 11.1
Apparent Magnitude: 16.5
Right Ascension(RA) 282.2500
Declination (DEC) 44.9211
Hubble Space Telescope Guide Star Catalog (GSC) ID 0
Discovered by
Discovery Paper - Authors "Philip S. Muirhead, Andrew W. Mann, Andrew Vanderburg, Timothy D. Morton, Adam Kraus, Michael Ireland, Jonathan J. Swift, Gregory A. Feiden, Eric Gaidos, J. Zachary Gazak"
Discovery Paper - Title "Kepler-445, Kepler-446 and the Occurrence of Compact Multiples Orbiting Mid-M Dwarf Stars"
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-446+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-446%20b/
Kepler-446 b
Kepler-446 b

  • Kepler-446 b is an exoplanet orbiting the star Kepler-446, located about 391.4 light-years (120.0 pc) away from Solar System. Its discovery was publicly announced on 2015.
  • The host star Kepler-446 has apparent magnitude of 16.5, with absolute magnitude of 11.1.
  • It is 0.2 times more massive and 0.2 times bigger compared with our Sun. The surface temperature is 3359 with its spectral types of M5
  • In this planetary system, the extrasolar planet Kepler-446 b orbits around the star Kepler-446 every 1.6 days with its orbital distance of 0.02 AU ( 2382820.8 km)
  • (Projected orbit of Kepler-446 b around its host star Kepler-446)


  • The Star Kepler-446 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.059 AU ( 8775853.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.081 AU ( 12130522.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.124 AU ( 18484232.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.182 AU ( 27200357.7 km)
  • Radiation at Planetary Boundary of Kepler-446 b : 35443.40 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-446)



  • Kopparapu Recent Venus for Star Kepler-446 distance : 0.066 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-446 distance : 0.084 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-446 distance : 0.081 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-446 distance : 0.089 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-446 distance : 0.165 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-446 distance : 0.174 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-446)



  • Original Kopparapu Recent Venus for Star Kepler-446 distance : 0.066 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-446 distance : 0.087 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-446 distance : 0.087 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-446 distance : 0.167 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-446 distance : 0.174 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-446)



    (Position in Stellar Map of star Kepler-446 and its Exoplanet Kepler-446 b)



    (Zoomed position in Stellar Map of star Kepler-446 and its Exoplanet Kepler-446 b (zoom level 3))