Imaginary Picture of K2-389 b

Display orbital revolution of K2-389 b around the hoststar K2-389
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Exoplanet Name : K2-389 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.1948 (Rjup) 2.1840 (Rearth)
Mass (Mjup / Me): 0.0178 (Mjup) 5.6529 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0762 (AU) 0.0762 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0235
Orbital Period(Observed/Estimated) 8.58 (Days Obs.) 8.58 (Days Est.)
Surface Gravity (G Earth) 1.1852
Star Radiation at Atmospheric Boundary: 277374.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1024.3 (K)
Blackbody T 0.3(K) 961.9 (K)
Blackbody T 0.7(K) 778.3 (K)
Tidally Locked Blackbody T 0.1(K) 1218.1 (K)
Tidally Locked Blackbody T 0.3(K) 1143.9 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Theoretical
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-389
Alternate Name : "EPIC 245991048, TYC 5830-96-1"
Star Distance(LY) : 845.4
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5782 (K)
Spectral type : G2V
UV portion[%]: 0.3
Visible portion[%]: 1.5
IR portion[%]: 98.2
Metalicity : -0.0
Absolute Magnitude: 4.6
Apparent Magnitude: 11.7
Right Ascension(RA) 355.6304
Declination (DEC) -9.7136
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
K2-389 b
K2-389 b

  • K2-389 b is an exoplanet orbiting the star K2-389, located about 845.4 light-years (259.2 pc) away from Solar System. Its discovery was publicly announced on 2022.
  • The host star K2-389 has apparent magnitude of 11.7, with absolute magnitude of 4.6.
  • It is 0.8 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5782 with its spectral types of G2V
  • In this planetary system, the extrasolar planet K2-389 b orbits around the star K2-389 every 8.6 days with its orbital distance of 0.08 AU ( 11399357.7 km)
  • (Projected orbit of K2-389 b around its host star K2-389)


  • The Star K2-389 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.785 AU ( 117447443.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.085 AU ( 162343060.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.654 AU ( 247374897.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.433 AU ( 364022998.1 km)
  • Radiation at Planetary Boundary of K2-389 b : 277374.02 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-389)



  • Kopparapu Recent Venus for Star K2-389 distance : 0.814 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-389 distance : 1.030 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-389 distance : 0.995 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-389 distance : 1.091 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-389 distance : 1.819 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-389 distance : 1.919 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-389)



  • Original Kopparapu Recent Venus for Star K2-389 distance : 0.815 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-389 distance : 1.059 AU
  • Original Kopparapu Moist Greenhouse for Star K2-389 distance : 1.078 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-389 distance : 1.851 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-389 distance : 1.925 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-389)



    (Position in Stellar Map of star K2-389 and its Exoplanet K2-389 b)



    (Zoomed position in Stellar Map of star K2-389 and its Exoplanet K2-389 b (zoom level 3))

    (Synthetic Spectrum of star K2-389*)
    *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