Imaginary Picture of K2-103 b

Display orbital revolution of K2-103 b around the hoststar EPIC 211822797
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Exoplanet Name : K2-103 b
Alternate Name : "2MASS J08413848+1738240 b, EPIC 211822797.01, K2-103 b, WISE J084138.46+173823.9 b"
Status : Confirmed
Radius (Rjup / Re): 0.1770 (Rjup) 1.9840 (Rearth)
Mass (Mjup / Me): 0.0157 (Mjup) 4.9891 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1310 (AU) 0.1310 (AU Est.)
Eccentricity : 0.0600
Orbital Period(Yrs) 0.0580
Orbital Period(Observed/Estimated) 21.17 (Days Obs.) 21.32 (Days Est.)
Surface Gravity (G Earth) 1.2675
Star Radiation at Atmospheric Boundary: 6873.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 406.4 (K)
Blackbody T 0.3(K) 381.6 (K)
Blackbody T 0.7(K) 308.8 (K)
Tidally Locked Blackbody T 0.1(K) 483.3 (K)
Tidally Locked Blackbody T 0.3(K) 453.8 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : EPIC 211822797
Alternate Name : "2MASS J08413848+1738240, K2-103, WISE J084138.46+173823.9"
Star Distance(LY) : 610.5
Stellar Radius(Rsun) : 0.6 (Rsun Measured)
Stellar Mass(Msun) : 0.7 (Msun Measured) 0.7 (Msun Estimated)
Star Age : 0.8 (GY)
Temperature : 4148 (K)
Spectral type : M0
UV portion[%]: 0.8
Visible portion[%]: 25.9
IR portion[%]: 73.3
Metalicity : 0.0
Absolute Magnitude: 5.9
Apparent Magnitude: 12.3
Right Ascension(RA) 130.4103
Declination (DEC) 17.6400
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=EPIC+211822797+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-103 b
K2-103 b

  • K2-103 b is an exoplanet orbiting the star EPIC 211822797, located about 610.5 light-years (187.2 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star EPIC 211822797 has apparent magnitude of 12.3, with absolute magnitude of 5.9.
  • It is 0.7 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 4148 with its spectral types of M0
  • In this planetary system, the extrasolar planet K2-103 b orbits around the star EPIC 211822797 every 21.2 days with its orbital distance of 0.13 AU ( 19597321.1 km)
  • (Projected orbit of K2-103 b around its host star EPIC 211822797)


  • The Star EPIC 211822797 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.212 AU ( 31784139.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.294 AU ( 43933987.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.448 AU ( 66945674.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.659 AU ( 98513492.6 km)
  • Radiation at Planetary Boundary of K2-103 b : 6873.33 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star EPIC 211822797)



  • Kopparapu Recent Venus for Star EPIC 211822797 distance : 0.237 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star EPIC 211822797 distance : 0.300 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star EPIC 211822797 distance : 0.290 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star EPIC 211822797 distance : 0.319 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star EPIC 211822797 distance : 0.566 AU
  • Kopparapu Outer Boundary for Early Mars for Star EPIC 211822797 distance : 0.597 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star EPIC 211822797)



  • Original Kopparapu Recent Venus for Star EPIC 211822797 distance : 0.234 AU
  • Original Kopparapu Runaway Greenhouse for Star EPIC 211822797 distance : 0.310 AU
  • Original Kopparapu Moist Greenhouse for Star EPIC 211822797 distance : 0.310 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star EPIC 211822797 distance : 0.575 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star EPIC 211822797 distance : 0.598 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star EPIC 211822797)



    (Position in Stellar Map of star EPIC 211822797 and its Exoplanet K2-103 b)



    (Zoomed position in Stellar Map of star EPIC 211822797 and its Exoplanet K2-103 b (zoom level 3))

    (Synthetic Spectrum of star EPIC 211822797*)
    *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