Imaginary Picture of K2-155 c

Display orbital revolution of K2-155 c around the hoststar K2-155
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Exoplanet Name : K2-155 c
Alternate Name : "K2-155 c, EPIC 210897587 c, 2MASS J04215245+2121131 c, LP 415-17 c, WISE J042152.63+212112.2 c"
Status : Confirmed
Radius (Rjup / Re): 0.2320 (Rjup) 2.6005 (Rearth)
Mass (Mjup / Me): 0.0205 (Mjup) 6.5177 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0946 (AU) 0.0946 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0379
Orbital Period(Observed/Estimated) 13.85 (Days Obs.) 13.18 (Days Est.)
Surface Gravity (G Earth) 0.9638
Star Radiation at Atmospheric Boundary: 15153.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 495.2 (K)
Blackbody T 0.3(K) 465.0 (K)
Blackbody T 0.7(K) 376.3 (K)
Tidally Locked Blackbody T 0.1(K) 588.9 (K)
Tidally Locked Blackbody T 0.3(K) 553.0 (K)
Size Class: sub-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 : K2-155
Alternate Name : "EPIC 210897587, 2MASS 04215245+21211, K2-155, 2MASS J04215245+2121131, LP 415-17, WISE J042152.63+212112.2"
Star Distance(LY) : 237.9
Stellar Radius(Rsun) : 0.6 (Rsun Measured)
Stellar Mass(Msun) : 0.7 (Msun Measured) 0.6 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4258 (K)
Spectral type : K7
UV portion[%]: 0.9
Visible portion[%]: 27.1
IR portion[%]: 72.0
Metalicity : -0.3
Absolute Magnitude: 8.5
Apparent Magnitude: 12.8
Right Ascension(RA) 65.4687
Declination (DEC) 21.3536
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=K2-155&submit=SIMBAD+search
Open Exoplanet Database Link
K2-155 c
K2-155 c

  • K2-155 c is an exoplanet orbiting the star K2-155, located about 237.9 light-years (72.9 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-155 has apparent magnitude of 12.8, with absolute magnitude of 8.5.
  • It is 0.7 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 4258 with its spectral types of K7
  • In this planetary system, the extrasolar planet K2-155 c orbits around the star K2-155 every 13.8 days with its orbital distance of 0.09 AU ( 14151958.6 km)
  • (Projected orbit of K2-155 c around its host star K2-155)


  • The Star K2-155 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.228 AU ( 34079830.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.315 AU ( 47107231.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.480 AU ( 71780995.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.706 AU ( 105628879.6 km)
  • Radiation at Planetary Boundary of K2-155 c : 15153.09 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-155)



  • Kopparapu Recent Venus for Star K2-155 distance : 0.254 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-155 distance : 0.321 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-155 distance : 0.310 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-155 distance : 0.341 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-155 distance : 0.601 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-155 distance : 0.634 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-155)



  • Original Kopparapu Recent Venus for Star K2-155 distance : 0.250 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-155 distance : 0.332 AU
  • Original Kopparapu Moist Greenhouse for Star K2-155 distance : 0.331 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-155 distance : 0.611 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-155 distance : 0.636 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-155)



    (Position in Stellar Map of star K2-155 and its Exoplanet K2-155 c)



    (Zoomed position in Stellar Map of star K2-155 and its Exoplanet K2-155 c (zoom level 3))

    (Synthetic Spectrum of star K2-155*)
    *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