Imaginary Picture of K2-55 b
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Exoplanet Name : K2-55 b
Alternate Name :
Radius (Rjup / Re): 0.3952 (Rjup) 4.4298 (Rearth)
Mass (Mjup / Me): 0.1380 (Mjup) 43.8754 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0347 (AU) 0.0347 (AU Est.)
Eccentricity : 0.1240
Orbital Period(Yrs) 0.0078
Orbital Period(Observed/Estimated) 2.85 (Days Obs.) 2.85 (Days Est.)
Star Radiation at Atmospheric Boundary: 178004.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 916.7 (K)
Blackbody T 0.3(K) 860.9 (K)
Blackbody T 0.7(K) 696.6 (K)
Tidally Locked Blackbody T 0.1(K) 1090.2 (K)
Tidally Locked Blackbody T 0.3(K) 1023.8 (K)
Size Class: Neptune-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 : K2-55
Alternate Name :
Star Distance(LY) : 0.0
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.7 (Msun Measured) 0.7 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4300 (K)
Spectral type : K6
Metalicity : 0.4
Absolute Magnitude: 25.0
Apparent Magnitude: 13.6
Right Ascension(RA) 333.7519
Declination (DEC) -17.2508
Hubble Space Telescope Guide Star Catalog (GSC) ID
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=K2-55+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-55 b
K2-55 b

  • K2-55 b is an exoplanet orbiting the star K2-55. Its discovery was publicly announced on 2018.
  • The host star K2-55 has apparent magnitude of 13.6, with absolute magnitude of 25.0.
  • It is 0.7 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4300 with its spectral types of K6
  • In this planetary system, the extrasolar planet K2-55 b orbits around the star K2-55 every 2.8 days with its orbital distance of 0.03 AU ( 5191046.1 km)
  • (Projected orbit of K2-55 b around its host star K2-55)


  • The Star K2-55 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.286 AU ( 42845090.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.396 AU ( 59223112.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.603 AU ( 90242916.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.888 AU ( 132796405.0 km)
  • Radiation at Planetary Boundary of K2-55 b : 178004.82 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-55)



  • Kopparapu Recent Venus for Star K2-55 distance : 0.318 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-55 distance : 0.403 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-55 distance : 0.389 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-55 distance : 0.428 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-55 distance : 0.754 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-55 distance : 0.795 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-55)



  • Original Kopparapu Recent Venus for Star K2-55 distance : 0.314 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-55 distance : 0.416 AU
  • Original Kopparapu Moist Greenhouse for Star K2-55 distance : 0.416 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-55 distance : 0.766 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-55 distance : 0.796 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-55)



    (Position in Stellar Map of star K2-55 and its Exoplanet K2-55 b)



    (Zoomed position in Stellar Map of star K2-55 and its Exoplanet K2-55 b (zoom level 3))