Imaginary Picture of K2-55 b

Display orbital revolution of K2-55 b around the hoststar K2-55
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Exoplanet Name : K2-55 b
Alternate Name : EPIC 205924614.01
Radius (Rjup / Re): 0.3410 (Rjup) 3.8223 (Rearth)
Mass (Mjup / Me): 0.1380 (Mjup) 43.8754 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0349 (AU) 0.0349 (AU Est.)
Eccentricity : 0.1240
Orbital Period(Yrs) 0.0078
Orbital Period(Observed/Estimated) 2.85 (Days Obs.) 2.84 (Days Est.)
Surface Gravity (G Earth) 3.0032
Star Radiation at Atmospheric Boundary: 157910.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 889.7 (K)
Blackbody T 0.3(K) 835.5 (K)
Blackbody T 0.7(K) 676.0 (K)
Tidally Locked Blackbody T 0.1(K) 1058.0 (K)
Tidally Locked Blackbody T 0.3(K) 993.6 (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 : "2MASS J22150046-1715025, EPIC 205924614, WISE J221500.44-171502.7"
Star Distance(LY) : 522.7
Stellar Radius(Rsun) : 0.6 (Rsun Measured)
Stellar Mass(Msun) : 0.7 (Msun Measured) 0.7 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4456 (K)
Spectral type : K5
UV portion[%]: 1.4
Visible portion[%]: 30.3
IR portion[%]: 68.2
Metalicity : 0.4
Absolute Magnitude: 7.6
Apparent Magnitude: 13.6
Right Ascension(RA) 333.7519
Declination (DEC) -17.2507
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, located about 522.7 light-years (160.3 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star K2-55 has apparent magnitude of 13.6, with absolute magnitude of 7.6.
  • It is 0.7 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 4456 with its spectral types of K5
  • 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 ( 5214981.8 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 ) : 0.271 AU ( 40540493.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.375 AU ( 56037555.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.571 AU ( 85388834.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.840 AU ( 125653410.0 km)
  • Radiation at Planetary Boundary of K2-55 b : 157910.81 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 : 0.300 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-55 distance : 0.379 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-55 distance : 0.367 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-55 distance : 0.403 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-55 distance : 0.704 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-55 distance : 0.743 AU

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



  • Original Kopparapu Recent Venus for Star K2-55 distance : 0.296 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-55 distance : 0.392 AU
  • Original Kopparapu Moist Greenhouse for Star K2-55 distance : 0.391 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-55 distance : 0.716 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-55 distance : 0.744 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))

    (Synthetic Spectrum of star K2-55*)
    *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