Imaginary Picture of K2-91 b

Display orbital revolution of K2-91 b around the hoststar K2-91
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Exoplanet Name : K2-91 b
Alternate Name : EPIC 211077024.01
Status : Confirmed
Radius (Rjup / Re): 0.0980 (Rjup) 1.0985 (Rearth)
Mass (Mjup / Me): 0.0043 (Mjup) 1.3709 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0164 (AU) 0.0164 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0039
Orbital Period(Observed/Estimated) 1.42 (Days Obs.) 1.42 (Days Est.)
Surface Gravity (G Earth) 1.1361
Star Radiation at Atmospheric Boundary: 61521.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 702.9 (K)
Blackbody T 0.3(K) 660.1 (K)
Blackbody T 0.7(K) 534.1 (K)
Tidally Locked Blackbody T 0.1(K) 835.9 (K)
Tidally Locked Blackbody T 0.3(K) 785.0 (K)
Size Class: 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 : K2-91
Alternate Name : "2MASS J04125232+2412185, EPIC 211077024"
Star Distance(LY) : 203.3
Stellar Radius(Rsun) : 0.3 (Rsun Measured)
Stellar Mass(Msun) : 0.3 (Msun Measured) 0.3 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3622 (K)
Spectral type : M3
UV portion[%]: 0.4
Visible portion[%]: 17.0
IR portion[%]: 82.6
Metalicity : 0.0
Absolute Magnitude: 7.5
Apparent Magnitude: 11.4
Right Ascension(RA) 63.2181
Declination (DEC) 24.2051
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK https://simbad.u-strasbg.fr/simbad/sim-basic?Ident=K2-91&submit=SIMBAD+search
Open Exoplanet Database Link
K2-91 b
K2-91 b

  • K2-91 b is an exoplanet orbiting the star K2-91, located about 203.3 light-years (62.3 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star K2-91 has apparent magnitude of 11.4, with absolute magnitude of 7.5.
  • It is 0.3 times more massive and 0.3 times bigger compared with our Sun. The surface temperature is 3622 with its spectral types of M3
  • In this planetary system, the extrasolar planet K2-91 b orbits around the star K2-91 every 1.4 days with its orbital distance of 0.02 AU ( 2453405.1 km)
  • (Projected orbit of K2-91 b around its host star K2-91)


  • The Star K2-91 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.080 AU ( 11904551.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.110 AU ( 16455201.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.168 AU ( 25074085.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.247 AU ( 36897614.5 km)
  • Radiation at Planetary Boundary of K2-91 b : 61521.51 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-91)



  • Kopparapu Recent Venus for Star K2-91 distance : 0.090 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-91 distance : 0.114 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-91 distance : 0.110 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-91 distance : 0.121 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-91 distance : 0.220 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-91 distance : 0.232 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-91)



  • Original Kopparapu Recent Venus for Star K2-91 distance : 0.089 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-91 distance : 0.118 AU
  • Original Kopparapu Moist Greenhouse for Star K2-91 distance : 0.118 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-91 distance : 0.223 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-91 distance : 0.232 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-91)



    (Position in Stellar Map of star K2-91 and its Exoplanet K2-91 b)



    (Zoomed position in Stellar Map of star K2-91 and its Exoplanet K2-91 b (zoom level 3))

    (Synthetic Spectrum of star K2-91*)
    *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