Imaginary Picture of K2-189 b

Display orbital revolution of K2-189 b around the hoststar K2-189
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Exoplanet Name : K2-189 b
Alternate Name : "2MASS J13342910-1502105 b, EPIC 212394689 b, EPIC 212394689.02, TYC 6121-11-1 b, WISE J133429.13-150211.2 b"
Status : Confirmed
Radius (Rjup / Re): 0.1360 (Rjup) 1.5244 (Rearth)
Mass (Mjup / Me): 0.0142 (Mjup) 4.5162 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0361 (AU) 0.0361 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0071
Orbital Period(Observed/Estimated) 2.59 (Days Obs.) 2.58 (Days Est.)
Surface Gravity (G Earth) 1.9434
Star Radiation at Atmospheric Boundary: 660800.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1272.5 (K)
Blackbody T 0.3(K) 1195.0 (K)
Blackbody T 0.7(K) 966.9 (K)
Tidally Locked Blackbody T 0.1(K) 1513.3 (K)
Tidally Locked Blackbody T 0.3(K) 1421.1 (K)
Size Class: super-Earth-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 : K2-189
Alternate Name : "2MASS J13342910-1502105, EPIC 212394689, TYC 6121-11-1, WISE J133429.13-150211.2"
Star Distance(LY) : 791.2
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5519 (K)
Spectral type : G7
UV portion[%]: 7.0
Visible portion[%]: 43.4
IR portion[%]: 49.7
Metalicity : 0.0
Absolute Magnitude: 4.1
Apparent Magnitude: 11.0
Right Ascension(RA) 203.6213
Declination (DEC) -15.0364
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=K2-189+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-189 b
K2-189 b

  • K2-189 b is an exoplanet orbiting the star K2-189, located about 791.2 light-years (242.6 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-189 has apparent magnitude of 11.0, with absolute magnitude of 4.1.
  • It is 0.9 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5519 with its spectral types of G7
  • In this planetary system, the extrasolar planet K2-189 b orbits around the star K2-189 every 2.6 days with its orbital distance of 0.04 AU ( 5400483.1 km)
  • (Projected orbit of K2-189 b around its host star K2-189)


  • The Star K2-189 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.574 AU ( 85881209.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.794 AU ( 118710275.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.209 AU ( 180888189.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.779 AU ( 266184894.3 km)
  • Radiation at Planetary Boundary of K2-189 b : 660800.69 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-189)



  • Kopparapu Recent Venus for Star K2-189 distance : 0.604 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-189 distance : 0.765 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-189 distance : 0.739 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-189 distance : 0.810 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-189 distance : 1.361 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-189 distance : 1.436 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-189)



  • Original Kopparapu Recent Venus for Star K2-189 distance : 0.602 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-189 distance : 0.787 AU
  • Original Kopparapu Moist Greenhouse for Star K2-189 distance : 0.797 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-189 distance : 1.385 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-189 distance : 1.440 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-189)



    (Position in Stellar Map of star K2-189 and its Exoplanet K2-189 b)



    (Zoomed position in Stellar Map of star K2-189 and its Exoplanet K2-189 b (zoom level 3))

    (Synthetic Spectrum of star K2-189*)
    *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