Imaginary Picture of K2-24 b

Display orbital revolution of K2-24 b around the hoststar K2-24
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Exoplanet Name : K2-24 b
Alternate Name : "EPIC 203771098 b, 2MASS J16101770-2459251 b, EPIC 203771098.02, TYC 6784-837-1 b, WISE J161017.64-245925.8 b"
Status : Confirmed
Radius (Rjup / Re): 0.4820 (Rjup) 5.4027 (Rearth)
Mass (Mjup / Me): 0.0598 (Mjup) 19.0063 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1540 (AU) 0.1540 (AU Est.)
Eccentricity : 0.0600
Orbital Period(Yrs) 0.0572
Orbital Period(Observed/Estimated) 20.89 (Days Obs.) 21.34 (Days Est.)
Surface Gravity (G Earth) 0.6511
Star Radiation at Atmospheric Boundary: 69657.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 725.1 (K)
Blackbody T 0.3(K) 680.9 (K)
Blackbody T 0.7(K) 550.9 (K)
Tidally Locked Blackbody T 0.1(K) 862.3 (K)
Tidally Locked Blackbody T 0.3(K) 809.8 (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 : K2-24
Alternate Name : "EPIC 203771098, 2MASS 16101770-2459251, 2MASS J16101770-2459251, TYC 6784-837-1, WISE J161017.64-245925.8"
Star Distance(LY) : 559.0
Stellar Radius(Rsun) : 1.2 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 5.0 (GY)
Temperature : 5625 (K)
Spectral type : G9 V
UV portion[%]: 7.4
Visible portion[%]: 44.0
IR portion[%]: 48.6
Metalicity : 0.3
Absolute Magnitude: 5.5
Apparent Magnitude: 11.6
Right Ascension(RA) 242.5737
Declination (DEC) -24.9903
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=K2-24+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-24 b
K2-24 b

  • K2-24 b is an exoplanet orbiting the star K2-24, located about 559.0 light-years (171.4 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star K2-24 has apparent magnitude of 11.6, with absolute magnitude of 5.5.
  • It is 1.1 times more massive and 1.2 times bigger compared with our Sun. The surface temperature is 5625 with its spectral types of G9 V
  • In this planetary system, the extrasolar planet K2-24 b orbits around the star K2-24 every 20.9 days with its orbital distance of 0.15 AU ( 23038072.1 km)
  • (Projected orbit of K2-24 b around its host star K2-24)


  • The Star K2-24 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.795 AU ( 118949098.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.099 AU ( 164418739.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.675 AU ( 250537773.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.464 AU ( 368677308.3 km)
  • Radiation at Planetary Boundary of K2-24 b : 69657.75 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-24)



  • Kopparapu Recent Venus for Star K2-24 distance : 0.832 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-24 distance : 1.053 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-24 distance : 1.017 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-24 distance : 1.115 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-24 distance : 1.868 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-24 distance : 1.970 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-24)



  • Original Kopparapu Recent Venus for Star K2-24 distance : 0.830 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-24 distance : 1.083 AU
  • Original Kopparapu Moist Greenhouse for Star K2-24 distance : 1.099 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-24 distance : 1.900 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-24 distance : 1.976 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-24)



    (Position in Stellar Map of star K2-24 and its Exoplanet K2-24 b)



    (Zoomed position in Stellar Map of star K2-24 and its Exoplanet K2-24 b (zoom level 3))

    (Synthetic Spectrum of star K2-24*)
    *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