Imaginary Picture of K2-99 b

Display orbital revolution of K2-99 b around the hoststar K2-99
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Exoplanet Name : K2-99 b
Alternate Name : "TYC 4974-871 b, 2MASS J13550570-0526330 b, EPIC 212803289 b, EPIC 212803289.01, TYC 4974-871-1 b, WISE J135505.70-05263
Status : Confirmed
Radius (Rjup / Re): 1.0460 (Rjup) 11.7246 (Rearth)
Mass (Mjup / Me): 0.9700 (Mjup) 308.3999 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1597 (AU) 0.1597 (AU Est.)
Eccentricity : 0.1900
Orbital Period(Yrs) 0.0500
Orbital Period(Observed/Estimated) 18.25 (Days Obs.) 18.26 (Days Est.)
Surface Gravity (G Earth) 2.2435
Star Radiation at Atmospheric Boundary: 496855.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1185.0 (K)
Blackbody T 0.3(K) 1112.8 (K)
Blackbody T 0.7(K) 900.4 (K)
Tidally Locked Blackbody T 0.1(K) 1409.2 (K)
Tidally Locked Blackbody T 0.3(K) 1323.3 (K)
Size Class: 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 : K2-99
Alternate Name : "TYC 4974-871, 2MASS J13550570-0526330, EPIC 212803289, TYC 4974-871-1, WISE J135505.70-052632.9"
Star Distance(LY) : 1703.5
Stellar Radius(Rsun) : 2.6 (Rsun Measured)
Stellar Mass(Msun) : 1.6 (Msun Measured) 1.6 (Msun Estimated)
Star Age : 2.4 (GY)
Temperature : 6217 (K)
Spectral type : G0 IV
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : 0.2
Absolute Magnitude: 2.6
Apparent Magnitude: 11.1
Right Ascension(RA) 208.7738
Declination (DEC) -5.4425
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+212803289&submit=SIMBAD+search
Open Exoplanet Database Link
K2-99 b
K2-99 b

  • K2-99 b is an exoplanet orbiting the star K2-99, located about 1703.5 light-years (522.3 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star K2-99 has apparent magnitude of 11.1, with absolute magnitude of 2.6.
  • It is 1.6 times more massive and 2.6 times bigger compared with our Sun. The surface temperature is 6217 with its spectral types of G0 IV
  • In this planetary system, the extrasolar planet K2-99 b orbits around the star K2-99 every 18.3 days with its orbital distance of 0.16 AU ( 23890780.0 km)
  • (Projected orbit of K2-99 b around its host star K2-99)


  • The Star K2-99 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 2.202 AU ( 329439443.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 3.044 AU ( 455371403.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 4.638 AU ( 693885245.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 6.826 AU ( 1021082536.5 km)
  • Radiation at Planetary Boundary of K2-99 b : 496855.32 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-99)



  • Kopparapu Recent Venus for Star K2-99 distance : 2.222 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-99 distance : 2.814 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-99 distance : 2.718 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-99 distance : 2.979 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-99 distance : 4.920 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-99 distance : 5.189 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-99)



  • Original Kopparapu Recent Venus for Star K2-99 distance : 2.246 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-99 distance : 2.888 AU
  • Original Kopparapu Moist Greenhouse for Star K2-99 distance : 2.972 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-99 distance : 5.008 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-99 distance : 5.208 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-99)



    (Position in Stellar Map of star K2-99 and its Exoplanet K2-99 b)



    (Zoomed position in Stellar Map of star K2-99 and its Exoplanet K2-99 b (zoom level 3))

    (Synthetic Spectrum of star K2-99*)
    *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