Imaginary Picture of Kepler-538 b

Display orbital revolution of Kepler-538 b around the hoststar Kepler-538
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Exoplanet Name : Kepler-538 b
Alternate Name : "2MASS J19495685+4937244 b, K00365.01, KIC 11623629 b, KOI-365 b, KOI-365.01, Kepler-538 A b, TYC 3565-1191-1 b, WISE J1
Status : Confirmed
Radius (Rjup / Re): 0.1980 (Rjup) 2.2194 (Rearth)
Mass (Mjup / Me): 0.0333 (Mjup) 10.6032 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.4669 (AU) 0.4669 (AU Est.)
Eccentricity : 0.0410
Orbital Period(Yrs) 0.2238
Orbital Period(Observed/Estimated) 81.74 (Days Obs.) 123.52 (Days Est.)
Surface Gravity (G Earth) 2.1527
Star Radiation at Atmospheric Boundary: 3828.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 351.1 (K)
Blackbody T 0.3(K) 329.7 (K)
Blackbody T 0.7(K) 266.8 (K)
Tidally Locked Blackbody T 0.1(K) 417.5 (K)
Tidally Locked Blackbody T 0.3(K) 392.1 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Spectrum
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : Kepler-538
Alternate Name : "2MASS J19495685+4937244, KIC 11623629, KOI-365, Kepler-538 A, TYC 3565-1191-1, WISE J194956.79+493724.2"
Star Distance(LY) : 508.6
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 2.0 (Msun Estimated)
Star Age : 5.3 (GY)
Temperature : 5498 (K)
Spectral type : G6
UV portion[%]: 7.1
Visible portion[%]: 43.5
IR portion[%]: 49.4
Metalicity : -0.0
Absolute Magnitude: 4.1
Apparent Magnitude: 10.0
Right Ascension(RA) 297.4869
Declination (DEC) 49.6235
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 470 LIKELY FALSE POSITIVES
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-538%20b/
Kepler-538 b
Kepler-538 b

  • Kepler-538 b is an exoplanet orbiting the star Kepler-538, located about 508.6 light-years (155.9 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-538 has apparent magnitude of 10.0, with absolute magnitude of 4.1.
  • It is 0.9 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5498 with its spectral types of G6
  • In this planetary system, the extrasolar planet Kepler-538 b orbits around the star Kepler-538 every 81.7 days with its orbital distance of 0.47 AU ( 69847245.8 km)
  • (Projected orbit of Kepler-538 b around its host star Kepler-538)


  • The Star Kepler-538 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.565 AU ( 84543141.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.781 AU ( 116860714.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.190 AU ( 178069868.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.752 AU ( 262037611.4 km)
  • Radiation at Planetary Boundary of Kepler-538 b : 3828.23 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-538)



  • Kopparapu Recent Venus for Star Kepler-538 distance : 0.595 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-538 distance : 0.754 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-538 distance : 0.728 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-538 distance : 0.799 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-538 distance : 1.342 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-538 distance : 1.416 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-538)



  • Original Kopparapu Recent Venus for Star Kepler-538 distance : 0.593 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-538 distance : 0.776 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-538 distance : 0.785 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-538 distance : 1.366 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-538 distance : 1.420 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-538)



    (Position in Stellar Map of star Kepler-538 and its Exoplanet Kepler-538 b)



    (Zoomed position in Stellar Map of star Kepler-538 and its Exoplanet Kepler-538 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-538*)
    *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