Imaginary Picture of KELT-20 b

Display orbital revolution of KELT-20 b around the hoststar KELT-20
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Exoplanet Name : KELT-20 b
Alternate Name : "HD 185603 b, MASCARA-2 b"
Status : Confirmed
Radius (Rjup / Re): 1.8300 (Rjup) 20.5125 (Rearth)
Mass (Mjup / Me): 3.5180 (Mjup) 1118.5059 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0542 (AU) 0.0542 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0095
Orbital Period(Observed/Estimated) 3.47 (Days Obs.) 3.26 (Days Est.)
Surface Gravity (G Earth) 2.6583
Star Radiation at Atmospheric Boundary: 6617757.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 2263.7 (K)
Blackbody T 0.3(K) 2125.9 (K)
Blackbody T 0.7(K) 1720.0 (K)
Tidally Locked Blackbody T 0.1(K) 2692.0 (K)
Tidally Locked Blackbody T 0.3(K) 2528.1 (K)
Size Class: Super-Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : KELT-20
Alternate Name : "SAO 68614, 2MASS J19383872+3113091"
Star Distance(LY) : 446.7
Stellar Radius(Rsun) : 1.6 (Rsun Measured)
Stellar Mass(Msun) : 2.0 (Msun Measured) 1.8 (Msun Estimated)
Star Age : 0.3 (GY)
Temperature : 8981 (K)
Spectral type : A2V
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : -0.3
Absolute Magnitude: 1.9
Apparent Magnitude: 7.6
Right Ascension(RA) 294.6614
Declination (DEC) 31.2192
Hubble Space Telescope Guide Star Catalog (GSC) ID 02655-03344
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=KELT-20+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/KELT-20%20b/
KELT-20 b
KELT-20 b

  • KELT-20 b is an exoplanet orbiting the star KELT-20, located about 446.7 light-years (137.0 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star KELT-20 has apparent magnitude of 7.6, with absolute magnitude of 1.9.
  • It is 2.0 times more massive and 1.6 times bigger compared with our Sun. The surface temperature is 8981 with its spectral types of A2V
  • In this planetary system, the extrasolar planet KELT-20 b orbits around the star KELT-20 every 3.5 days with its orbital distance of 0.05 AU ( 8108204.6 km)
  • (Projected orbit of KELT-20 b around its host star KELT-20)


  • The Star KELT-20 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 2.728 AU ( 408047205.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 3.770 AU ( 564027873.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 5.745 AU ( 859453660.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 8.454 AU ( 1264723712.1 km)
  • Radiation at Planetary Boundary of KELT-20 b : 6617757.20 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star KELT-20)



  • Kopparapu Recent Venus for Star KELT-20 distance : 2.692 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star KELT-20 distance : 3.411 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star KELT-20 distance : 3.295 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star KELT-20 distance : 3.599 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star KELT-20 distance : 5.909 AU
  • Kopparapu Outer Boundary for Early Mars for Star KELT-20 distance : 6.229 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star KELT-20)



  • Original Kopparapu Recent Venus for Star KELT-20 distance : 2.741 AU
  • Original Kopparapu Runaway Greenhouse for Star KELT-20 distance : 3.469 AU
  • Original Kopparapu Moist Greenhouse for Star KELT-20 distance : 3.626 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star KELT-20 distance : 5.999 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star KELT-20 distance : 6.238 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star KELT-20)



    (Position in Stellar Map of star KELT-20 and its Exoplanet KELT-20 b)



    (Zoomed position in Stellar Map of star KELT-20 and its Exoplanet KELT-20 b (zoom level 3))

    (Synthetic Spectrum of star KELT-20*)
    *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