Imaginary Picture of Kepler-581 b
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Exoplanet Name : Kepler-581 b
Alternate Name :
Radius (Rjup / Re): 0.2350 (Rjup) 2.6341 (Rearth)
Mass (Mjup / Me): 0.0204 (Mjup) 6.4939 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.2312 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.1112
Orbital Period(Observed/Estimated) 40.61 (Days Obs.) 0.00 (Days Est.)
Star Radiation at Atmospheric Boundary: 25462.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 563.8 (K)
Blackbody T 0.3(K) 529.5 (K)
Blackbody T 0.7(K) 428.4 (K)
Tidally Locked Blackbody T 0.1(K) 670.5 (K)
Tidally Locked Blackbody T 0.3(K) 629.6 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : Kepler-581
Alternate Name :
Star Distance(LY) : 2716.9
Stellar Radius(Rsun) : 1.0 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5772 (K)
Spectral type : G3
Metalicity : 0.0
Absolute Magnitude: 3.7
Apparent Magnitude: 13.3
Right Ascension(RA) 295.4328
Declination (DEC) 40.6482
Hubble Space Telescope Guide Star Catalog (GSC) ID 0
Discovered by
Discovery Paper - Authors "Timothy D. Morton, Stephen T. Bryson, Jeffrey L. Coughlin, Jason F. Rowe, Ganesh Ravichandran, Erik A. Petigura, Michael R. Haas, and Natalie M. Batalha"
Discovery Paper - Title FALSE POSITIVE PROBABILITIES FOR ALL KEPLER OBJECTS OF INTEREST: 1284 NEWLY VALIDATED PLANETS AND 501 LIKELY FALSE POSITIVES
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK 0
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-581%20b/
Kepler-581 b
Kepler-581 b

  • Kepler-581 b is an exoplanet orbiting the star Kepler-581, located about 2716.9 light-years (833.0 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-581 has apparent magnitude of 13.3, with absolute magnitude of 3.7.
  • It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5772 with its spectral types of G3
  • In this planetary system, the extrasolar planet Kepler-581 b orbits around the star Kepler-581 every 40.6 days with its orbital distance of 0.23 AU ( 34588553.9 km)
  • (Projected orbit of Kepler-581 b around its host star Kepler-581)


  • The Star Kepler-581 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.722 AU ( 107971903.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.998 AU ( 149245386.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.520 AU ( 227416941.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.237 AU ( 334653992.2 km)
  • Radiation at Planetary Boundary of Kepler-581 b : 25462.21 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-581)



  • Kopparapu Recent Venus for Star Kepler-581 distance : 0.748 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-581 distance : 0.948 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-581 distance : 0.915 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-581 distance : 1.003 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-581 distance : 1.674 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-581 distance : 1.765 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-581)



  • Original Kopparapu Recent Venus for Star Kepler-581 distance : 0.749 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-581 distance : 0.974 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-581 distance : 0.991 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-581 distance : 1.703 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-581 distance : 1.771 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-581)



    (Position in Stellar Map of star Kepler-581 and its Exoplanet Kepler-581 b)



    (Zoomed position in Stellar Map of star Kepler-581 and its Exoplanet Kepler-581 b (zoom level 3))