Imaginary Picture of Kepler-581 b

Display orbital revolution of Kepler-581 b around the hoststar Kepler-581
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Exoplanet Name : Kepler-581 b
Alternate Name : "2MASS J19414386+4038536 b, K00504.01, KIC 5461440 b, KOI-504 b, KOI-504.01, WISE J194143.85+403853.6 b"
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.)
Surface Gravity (G Earth) 0.9359
Star Radiation at Atmospheric Boundary: 16144.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 503.1 (K)
Blackbody T 0.3(K) 472.5 (K)
Blackbody T 0.7(K) 382.3 (K)
Tidally Locked Blackbody T 0.1(K) 598.3 (K)
Tidally Locked Blackbody T 0.3(K) 561.9 (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 : "2MASS J19414386+4038536, KIC 5461440, KOI-504, WISE J194143.85+403853.6"
Star Distance(LY) : 2295.1
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 4.1 (GY)
Temperature : 5538 (K)
Spectral type : G3
UV portion[%]: 7.8
Visible portion[%]: 44.7
IR portion[%]: 47.4
Metalicity : 0.0
Absolute Magnitude: 4.1
Apparent Magnitude: 13.3
Right Ascension(RA) 295.4328
Declination (DEC) 40.6482
Hubble Space Telescope Guide Star Catalog (GSC) ID
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
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 2295.1 light-years (703.7 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 4.1.
  • It is 1.0 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5538 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 ) : 0.575 AU ( 85976571.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.794 AU ( 118842090.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.211 AU ( 181089045.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.781 AU ( 266480463.8 km)
  • Radiation at Planetary Boundary of Kepler-581 b : 16144.88 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 : 0.604 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-581 distance : 0.765 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-581 distance : 0.739 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-581 distance : 0.810 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-581 distance : 1.360 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-581 distance : 1.435 AU

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



  • Original Kopparapu Recent Venus for Star Kepler-581 distance : 0.602 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-581 distance : 0.787 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-581 distance : 0.797 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-581 distance : 1.384 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-581 distance : 1.439 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))

    (Synthetic Spectrum of star Kepler-581*)
    *Yamashiki YA et al. 2019 ApJ 881 114
    MUSCLES Paper I - France et al. 2016 ApJ 820 89
    MUSCLES Paper II- Youngblood et al. 2016 ApJ 824 101
    MUSCLES Paper III- Loyd et al. 2016 ApJ 824 102