Imaginary Picture of K2-80 d

Display orbital revolution of K2-80 d around the hoststar K2-80
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Exoplanet Name : K2-80 d
Alternate Name : "2MASS J03560900+1333334 d, EPIC 210403955 d, EPIC 210403955.03, WISE J035608.99+133332.8 d"
Status : Confirmed
Radius (Rjup / Re): 0.2280 (Rjup) 2.5557 (Rearth)
Mass (Mjup / Me): 0.0199 (Mjup) 6.3138 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.1778 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0790
Orbital Period(Observed/Estimated) 28.87 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 0.9667
Star Radiation at Atmospheric Boundary: 25730.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 565.3 (K)
Blackbody T 0.3(K) 530.8 (K)
Blackbody T 0.7(K) 429.5 (K)
Tidally Locked Blackbody T 0.1(K) 672.2 (K)
Tidally Locked Blackbody T 0.3(K) 631.3 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-80
Alternate Name : "2MASS J03560900+1333334, EPIC 210403955, WISE J035608.99+133332.8"
Star Distance(LY) : 658.7
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5441 (K)
Spectral type : G7
UV portion[%]: 6.6
Visible portion[%]: 42.8
IR portion[%]: 50.6
Metalicity : 0.0
Absolute Magnitude: 4.3
Apparent Magnitude: 10.9
Right Ascension(RA) 59.0375
Declination (DEC) 13.5593
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
K2-80 d
K2-80 d

  • K2-80 d is an exoplanet orbiting the star K2-80, located about 658.7 light-years (202.0 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-80 has apparent magnitude of 10.9, with absolute magnitude of 4.3.
  • It is 0.9 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5441 with its spectral types of G7
  • In this planetary system, the extrasolar planet K2-80 d orbits around the star K2-80 every 28.9 days with its orbital distance of 0.18 AU ( 26600087.9 km)
  • (Projected orbit of K2-80 d around its host star K2-80)


  • The Star K2-80 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.558 AU ( 83470846.3 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.771 AU ( 115378523.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.175 AU ( 175811336.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.729 AU ( 258714082.8 km)
  • Radiation at Planetary Boundary of K2-80 d : 25730.18 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-80)



  • Kopparapu Recent Venus for Star K2-80 distance : 0.590 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-80 distance : 0.747 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-80 distance : 0.721 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-80 distance : 0.791 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-80 distance : 1.332 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-80 distance : 1.405 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-80)



  • Original Kopparapu Recent Venus for Star K2-80 distance : 0.587 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-80 distance : 0.768 AU
  • Original Kopparapu Moist Greenhouse for Star K2-80 distance : 0.777 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-80 distance : 1.355 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-80 distance : 1.409 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-80)



    (Position in Stellar Map of star K2-80 and its Exoplanet K2-80 d)



    (Zoomed position in Stellar Map of star K2-80 and its Exoplanet K2-80 d (zoom level 3))

    (Synthetic Spectrum of star K2-80*)
    *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