Imaginary Picture of K2-89 b

Display orbital revolution of K2-89 b around the hoststar K2-89
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Exoplanet Name : K2-89 b
Alternate Name : EPIC 210838726.01
Status : Confirmed
Radius (Rjup / Re): 0.0550 (Rjup) 0.6165 (Rearth)
Mass (Mjup / Me): 0.0006 (Mjup) 0.1785 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0146 (AU) 0.0146 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0030
Orbital Period(Observed/Estimated) 1.10 (Days Obs.) 1.09 (Days Est.)
Surface Gravity (G Earth) 0.4697
Star Radiation at Atmospheric Boundary: 109040.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 811.0 (K)
Blackbody T 0.3(K) 761.6 (K)
Blackbody T 0.7(K) 616.3 (K)
Tidally Locked Blackbody T 0.1(K) 964.5 (K)
Tidally Locked Blackbody T 0.3(K) 905.8 (K)
Size Class: Mars-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 : K2-89
Alternate Name : "2MASS J03481599+2027347, EPIC 210838726, WISE J034816.07+202734.3"
Star Distance(LY) : 281.3
Stellar Radius(Rsun) : 0.3 (Rsun Measured)
Stellar Mass(Msun) : 0.3 (Msun Measured) 0.3 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3691 (K)
Spectral type : M2
UV portion[%]: 0.4
Visible portion[%]: 18.1
IR portion[%]: 81.5
Metalicity : 0.0
Absolute Magnitude: 6.3
Apparent Magnitude: 10.9
Right Ascension(RA) 57.0667
Declination (DEC) 20.4596
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
K2-89 b
K2-89 b

  • K2-89 b is an exoplanet orbiting the star K2-89, located about 281.3 light-years (86.2 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star K2-89 has apparent magnitude of 10.9, with absolute magnitude of 6.3.
  • It is 0.3 times more massive and 0.3 times bigger compared with our Sun. The surface temperature is 3691 with its spectral types of M2
  • In this planetary system, the extrasolar planet K2-89 b orbits around the star K2-89 every 1.1 days with its orbital distance of 0.01 AU ( 2187120.9 km)
  • (Projected orbit of K2-89 b around its host star K2-89)


  • The Star K2-89 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.094 AU ( 14128504.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.131 AU ( 19529284.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.199 AU ( 29758308.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.293 AU ( 43790654.3 km)
  • Radiation at Planetary Boundary of K2-89 b : 109040.09 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-89)



  • Kopparapu Recent Venus for Star K2-89 distance : 0.106 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-89 distance : 0.135 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-89 distance : 0.130 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-89 distance : 0.143 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-89 distance : 0.260 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-89 distance : 0.274 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-89)



  • Original Kopparapu Recent Venus for Star K2-89 distance : 0.105 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-89 distance : 0.139 AU
  • Original Kopparapu Moist Greenhouse for Star K2-89 distance : 0.139 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-89 distance : 0.264 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-89 distance : 0.274 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-89)



    (Position in Stellar Map of star K2-89 and its Exoplanet K2-89 b)



    (Zoomed position in Stellar Map of star K2-89 and its Exoplanet K2-89 b (zoom level 3))

    (Synthetic Spectrum of star K2-89*)
    *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