Imaginary Picture of K2-98 b

Display orbital revolution of K2-98 b around the hoststar K2-98
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Exoplanet Name : K2-98 b
Alternate Name : "2MASS 08255719+1130402 b, UCAC 508-047859 b, 2MASS J08255719+1130402 b, EPIC 211391664 b, EPIC 211391664.01, WISE J0825
Radius (Rjup / Re): 0.4640 (Rjup) 5.2010 (Rearth)
Mass (Mjup / Me): 0.1010 (Mjup) 32.1117 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0974 (AU) 0.0974 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0278
Orbital Period(Observed/Estimated) 10.14 (Days Obs.) 10.14 (Days Est.)
Surface Gravity (G Earth) 1.1871
Star Radiation at Atmospheric Boundary: 462370.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1163.8 (K)
Blackbody T 0.3(K) 1093.0 (K)
Blackbody T 0.7(K) 884.3 (K)
Tidally Locked Blackbody T 0.1(K) 1384.0 (K)
Tidally Locked Blackbody T 0.3(K) 1299.8 (K)
Size Class: sub-Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-98
Alternate Name : "2MASS 08255719+1130402, K2-98, 2MASS J08255719+1130402, EPIC 211391664, WISE J082557.17+113040.0"
Star Distance(LY) : 1716.6
Stellar Radius(Rsun) : 1.6 (Rsun Measured)
Stellar Mass(Msun) : 1.2 (Msun Measured) 1.2 (Msun Estimated)
Star Age : 5.2 (GY)
Temperature : 6172 (K)
Spectral type : F8 V
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : -0.1
Absolute Magnitude: 3.6
Apparent Magnitude: 12.2
Right Ascension(RA) 126.4883
Declination (DEC) 11.5111
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=EPIC+211391664+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-98 b
K2-98 b

  • K2-98 b is an exoplanet orbiting the star K2-98, located about 1716.6 light-years (526.3 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star K2-98 has apparent magnitude of 12.2, with absolute magnitude of 3.6.
  • It is 1.2 times more massive and 1.6 times bigger compared with our Sun. The surface temperature is 6172 with its spectral types of F8 V
  • In this planetary system, the extrasolar planet K2-98 b orbits around the star K2-98 every 10.1 days with its orbital distance of 0.10 AU ( 14570832.6 km)
  • (Projected orbit of K2-98 b around its host star K2-98)


  • The Star K2-98 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.296 AU ( 193824913.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.791 AU ( 267916683.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.729 AU ( 408245735.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 4.016 AU ( 600751484.3 km)
  • Radiation at Planetary Boundary of K2-98 b : 462370.24 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-98)



  • Kopparapu Recent Venus for Star K2-98 distance : 1.311 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-98 distance : 1.660 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-98 distance : 1.604 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-98 distance : 1.757 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-98 distance : 2.905 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-98 distance : 3.064 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-98)



  • Original Kopparapu Recent Venus for Star K2-98 distance : 1.324 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-98 distance : 1.704 AU
  • Original Kopparapu Moist Greenhouse for Star K2-98 distance : 1.752 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-98 distance : 2.957 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-98 distance : 3.075 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-98)



    (Position in Stellar Map of star K2-98 and its Exoplanet K2-98 b)



    (Zoomed position in Stellar Map of star K2-98 and its Exoplanet K2-98 b (zoom level 3))

    (Synthetic Spectrum of star K2-98*)
    *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