Imaginary Picture of K2-73 b

Display orbital revolution of K2-73 b around the hoststar K2-73
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Exoplanet Name : K2-73 b
Alternate Name : EPIC 206245553.01
Status : Confirmed
Radius (Rjup / Re): 0.2190 (Rjup) 2.4548 (Rearth)
Mass (Mjup / Me): 0.0191 (Mjup) 6.0817 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0762 (AU) 0.0762 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0205
Orbital Period(Observed/Estimated) 7.50 (Days Obs.) 7.50 (Days Est.)
Surface Gravity (G Earth) 1.0093
Star Radiation at Atmospheric Boundary: 291940.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1037.4 (K)
Blackbody T 0.3(K) 974.3 (K)
Blackbody T 0.7(K) 788.3 (K)
Tidally Locked Blackbody T 0.1(K) 1233.7 (K)
Tidally Locked Blackbody T 0.3(K) 1158.6 (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 : K2-73
Alternate Name : "2MASS J22200610-0903219, EPIC 206245553, TYC 5804-1290-1, WISE J222006.14-090321.9"
Star Distance(LY) : 897.8
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5922 (K)
Spectral type : G1
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : 0.0
Absolute Magnitude: 3.5
Apparent Magnitude: 10.7
Right Ascension(RA) 335.0255
Declination (DEC) -9.0561
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=K2-73+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-73 b
K2-73 b

  • K2-73 b is an exoplanet orbiting the star K2-73, located about 897.8 light-years (275.3 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star K2-73 has apparent magnitude of 10.7, with absolute magnitude of 3.5.
  • It is 1.1 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5922 with its spectral types of G1
  • In this planetary system, the extrasolar planet K2-73 b orbits around the star K2-73 every 7.5 days with its orbital distance of 0.08 AU ( 11397861.8 km)
  • (Projected orbit of K2-73 b around its host star K2-73)


  • The Star K2-73 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.805 AU ( 120476067.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.113 AU ( 166529409.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.696 AU ( 253753967.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.496 AU ( 373410079.5 km)
  • Radiation at Planetary Boundary of K2-73 b : 291940.40 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-73)



  • Kopparapu Recent Venus for Star K2-73 distance : 0.827 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-73 distance : 1.048 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-73 distance : 1.012 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-73 distance : 1.109 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-73 distance : 1.844 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-73 distance : 1.945 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-73)



  • Original Kopparapu Recent Venus for Star K2-73 distance : 0.831 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-73 distance : 1.076 AU
  • Original Kopparapu Moist Greenhouse for Star K2-73 distance : 1.099 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-73 distance : 1.876 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-73 distance : 1.951 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-73)



    (Position in Stellar Map of star K2-73 and its Exoplanet K2-73 b)



    (Zoomed position in Stellar Map of star K2-73 and its Exoplanet K2-73 b (zoom level 3))

    (Synthetic Spectrum of star K2-73*)
    *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