Imaginary Picture of K2-74 b

Display orbital revolution of K2-74 b around the hoststar K2-74
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Exoplanet Name : K2-74 b
Alternate Name : EPIC 206268299.01
Status : Confirmed
Radius (Rjup / Re): 0.2060 (Rjup) 2.3091 (Rearth)
Mass (Mjup / Me): 0.0181 (Mjup) 5.7452 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1402 (AU) 0.1402 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0536
Orbital Period(Observed/Estimated) 19.57 (Days Obs.) 19.57 (Days Est.)
Surface Gravity (G Earth) 1.0776
Star Radiation at Atmospheric Boundary: 80807.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 752.5 (K)
Blackbody T 0.3(K) 706.7 (K)
Blackbody T 0.7(K) 571.8 (K)
Tidally Locked Blackbody T 0.1(K) 894.9 (K)
Tidally Locked Blackbody T 0.3(K) 840.4 (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 : K2-74
Alternate Name : "2MASS J22394063-0842521, EPIC 206268299, WISE J223940.63-084252.3"
Star Distance(LY) : 1237.5
Stellar Radius(Rsun) : 1.0 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 6060 (K)
Spectral type : G0
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : 0.0
Absolute Magnitude: 3.5
Apparent Magnitude: 11.4
Right Ascension(RA) 339.9193
Declination (DEC) -8.7145
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=K2-74+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-74 b
K2-74 b

  • K2-74 b is an exoplanet orbiting the star K2-74, located about 1237.5 light-years (379.4 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star K2-74 has apparent magnitude of 11.4, with absolute magnitude of 3.5.
  • It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 6060 with its spectral types of G0
  • In this planetary system, the extrasolar planet K2-74 b orbits around the star K2-74 every 19.6 days with its orbital distance of 0.14 AU ( 20973621.5 km)
  • (Projected orbit of K2-74 b around its host star K2-74)


  • The Star K2-74 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.780 AU ( 116635145.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.078 AU ( 161220251.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.642 AU ( 245663985.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.417 AU ( 361505317.1 km)
  • Radiation at Planetary Boundary of K2-74 b : 80807.46 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-74)



  • Kopparapu Recent Venus for Star K2-74 distance : 0.794 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-74 distance : 1.006 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-74 distance : 0.972 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-74 distance : 1.065 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-74 distance : 1.764 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-74 distance : 1.861 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-74)



  • Original Kopparapu Recent Venus for Star K2-74 distance : 0.800 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-74 distance : 1.033 AU
  • Original Kopparapu Moist Greenhouse for Star K2-74 distance : 1.059 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-74 distance : 1.796 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-74 distance : 1.867 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-74)



    (Position in Stellar Map of star K2-74 and its Exoplanet K2-74 b)



    (Zoomed position in Stellar Map of star K2-74 and its Exoplanet K2-74 b (zoom level 3))

    (Synthetic Spectrum of star K2-74*)
    *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