Imaginary Picture of Kepler-438 b
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Exoplanet Name : Kepler-438 b
Alternate Name :
Radius (Rjup / Re): 0.0999 (Rjup) 1.1198 (Rearth)
Mass (Mjup / Me): 0.0046 (Mjup) 1.4690 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1660 (AU) 0.1660 (AU Est.)
Eccentricity : 0.0300
Orbital Period(Yrs) 0.0965
Orbital Period(Observed/Estimated) 35.23 (Days Obs.) 33.49 (Days Est.)
Star Radiation at Atmospheric Boundary: 2413.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 312.8 (K)
Blackbody T 0.3(K) 293.8 (K)
Blackbody T 0.7(K) 237.7 (K)
Tidally Locked Blackbody T 0.1(K) 372.0 (K)
Tidally Locked Blackbody T 0.3(K) 349.4 (K)
Size Class: Earth-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Habitable
Habitability by Kopparapu: Not habitable
Star Name : Kepler-438
Alternate Name :
Star Distance(LY) : 462.5
Stellar Radius(Rsun) : 0.5 (Rsun Measured)
Stellar Mass(Msun) : 0.5 (Msun Measured) 0.5 (Msun Estimated)
Star Age : 4.4 (GY)
Temperature : 3749 (K)
Spectral type : M1
Metalicity : 0.2
Absolute Magnitude: 9.2
Apparent Magnitude: 15.0
Right Ascension(RA) 281.6458
Declination (DEC) 41.9511
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-438+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-438%20b/
Kepler-438 b
Kepler-438 b

  • Kepler-438 b is an exoplanet orbiting the star Kepler-438, located about 462.5 light-years (141.8 pc) away from Solar System. Its discovery was publicly announced on 2015.
  • The host star Kepler-438 has apparent magnitude of 15.0, with absolute magnitude of 9.2.
  • It is 0.5 times more massive and 0.5 times bigger compared with our Sun. The surface temperature is 3749 with its spectral types of M1
  • In this planetary system, the extrasolar planet Kepler-438 b orbits around the star Kepler-438 every 35.2 days with its orbital distance of 0.17 AU ( 24833246.5 km)
  • (Projected orbit of Kepler-438 b around its host star Kepler-438)


  • The Star Kepler-438 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.160 AU ( 23868233.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.221 AU ( 32992136.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.336 AU ( 50272714.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.495 AU ( 73978502.0 km)
  • Radiation at Planetary Boundary of Kepler-438 b : 2413.86 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-438)



  • Kopparapu Recent Venus for Star Kepler-438 distance : 0.180 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-438 distance : 0.227 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-438 distance : 0.220 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-438 distance : 0.241 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-438 distance : 0.437 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-438 distance : 0.461 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-438)



  • Original Kopparapu Recent Venus for Star Kepler-438 distance : 0.178 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-438 distance : 0.235 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-438 distance : 0.235 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-438 distance : 0.444 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-438 distance : 0.462 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-438)



    (Position in Stellar Map of star Kepler-438 and its Exoplanet Kepler-438 b)



    (Zoomed position in Stellar Map of star Kepler-438 and its Exoplanet Kepler-438 b (zoom level 3))