Imaginary Picture of EPIC 203868608 (AB) a

Display orbital revolution of EPIC 203868608 (AB) a around the hoststar EPIC 203868608 (AB)
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Exoplanet Name : EPIC 203868608 (AB) a
Alternate Name :
Status : Checking
Radius (Rjup / Re): 2.7500 (Rjup) 30.8247 (Rearth)
Mass (Mjup / Me): 23.2000 (Mjup) 7376.1616 (Mearth)
Semi Major Axis / Orbital Distance Calculated 19.3000 (AU) 19.3000 (AU Est.)
Eccentricity : 0.3227
Orbital Period(Yrs) 0.0122
Orbital Period(Observed/Estimated) 4.45 (Days Obs.) 51016.12 (Days Est.)
Surface Gravity (G Earth) 7.7630
Star Radiation at Atmospheric Boundary: 0.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 20.9 (K)
Blackbody T 0.3(K) 19.6 (K)
Blackbody T 0.7(K) 15.9 (K)
Tidally Locked Blackbody T 0.1(K) 24.9 (K)
Tidally Locked Blackbody T 0.3(K) 23.4 (K)
Size Class: Sub-Star-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Theoretical
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : EPIC 203868608 (AB)
Alternate Name :
Star Distance(LY) : 499.0
Stellar Radius(Rsun) : 0.4 (Rsun Estimated)
Stellar Mass(Msun) : 0.4 (Msun Measured) 48410234.6 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3200 (K)
Spectral type : M5+M5
UV portion[%]: 0.1
Visible portion[%]: 8.1
IR portion[%]: 91.8
Metalicity : 0.0
Absolute Magnitude: 16.1
Apparent Magnitude: 22.0
Right Ascension(RA) 244.3292
Declination (DEC) -24.6219
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK
Open Exoplanet Database Link
EPIC 203868608 (AB) a
EPIC 203868608 (AB) a

  • EPIC 203868608 (AB) a is an exoplanet orbiting the star EPIC 203868608 (AB), located about 499.0 light-years (153.0 pc) away from Solar System. Its discovery was publicly announced on 2019.
  • The host star EPIC 203868608 (AB) has apparent magnitude of 22.0, with absolute magnitude of 16.1.
  • It is 0.4 times more massive and 0.4 times bigger compared with our Sun. The surface temperature is 3200 with its spectral types of M5+M5
  • In this planetary system, the extrasolar planet EPIC 203868608 (AB) a orbits around the star EPIC 203868608 (AB) every 4.5 days with its orbital distance of 19.30 AU ( 2887238904.5 km)
  • (Projected orbit of EPIC 203868608 (AB) a around its host star EPIC 203868608 (AB))


  • The Star EPIC 203868608 (AB) 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.083 AU ( 12407969.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.115 AU ( 17151056.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.175 AU ( 26134415.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.257 AU ( 38457936.9 km)
  • Radiation at Planetary Boundary of EPIC 203868608 (AB) a : 0.05 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star EPIC 203868608 (AB))



  • Kopparapu Recent Venus for Star EPIC 203868608 (AB) distance : 0.094 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star EPIC 203868608 (AB) distance : 0.119 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star EPIC 203868608 (AB) distance : 0.115 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star EPIC 203868608 (AB) distance : 0.126 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star EPIC 203868608 (AB) distance : 0.235 AU
  • Kopparapu Outer Boundary for Early Mars for Star EPIC 203868608 (AB) distance : 0.248 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star EPIC 203868608 (AB))



  • Original Kopparapu Recent Venus for Star EPIC 203868608 (AB) distance : 0.094 AU
  • Original Kopparapu Runaway Greenhouse for Star EPIC 203868608 (AB) distance : 0.123 AU
  • Original Kopparapu Moist Greenhouse for Star EPIC 203868608 (AB) distance : 0.124 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star EPIC 203868608 (AB) distance : 0.239 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star EPIC 203868608 (AB) distance : 0.248 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star EPIC 203868608 (AB))



    (Position in Stellar Map of star EPIC 203868608 (AB) and its Exoplanet EPIC 203868608 (AB) a)



    (Zoomed position in Stellar Map of star EPIC 203868608 (AB) and its Exoplanet EPIC 203868608 (AB) a (zoom level 3))

    (Synthetic Spectrum of star EPIC 203868608 (AB)*)
    *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