Imaginary Picture of K2-304 b

Display orbital revolution of K2-304 b around the hoststar K2-304
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Exoplanet Name : K2-304 b
Alternate Name : "2MASS J13484949-1736355 b, EPIC 212297394.02, WISE J134849.47-173635.6 b, EPIC 212297394 b"
Status : Confirmed
Radius (Rjup / Re): 0.1180 (Rjup) 1.3227 (Rearth)
Mass (Mjup / Me): 0.0084 (Mjup) 2.6861 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0319 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0063
Orbital Period(Observed/Estimated) 2.29 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.5354
Star Radiation at Atmospheric Boundary: 549770.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1215.3 (K)
Blackbody T 0.3(K) 1141.3 (K)
Blackbody T 0.7(K) 923.4 (K)
Tidally Locked Blackbody T 0.1(K) 1445.3 (K)
Tidally Locked Blackbody T 0.3(K) 1357.2 (K)
Size Class: super-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 : K2-304
Alternate Name : "2MASS J13484949-1736355, WISE J134849.47-173635.6, EPIC 212297394"
Star Distance(LY) : 1364.6
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5171 (K)
Spectral type : G9/K0V
UV portion[%]: 4.7
Visible portion[%]: 39.7
IR portion[%]: 55.6
Metalicity : -0.0
Absolute Magnitude: 6.3
Apparent Magnitude: 14.4
Right Ascension(RA) 207.2062
Declination (DEC) -17.6099
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=EPIC+212297394&submit=SIMBAD+search
Open Exoplanet Database Link
K2-304 b
K2-304 b

  • K2-304 b is an exoplanet orbiting the star K2-304, located about 1364.6 light-years (418.4 pc) away from Solar System. Its discovery was publicly announced on 2019.
  • The host star K2-304 has apparent magnitude of 14.4, with absolute magnitude of 6.3.
  • It is 0.8 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5171 with its spectral types of G9/K0V
  • In this planetary system, the extrasolar planet K2-304 b orbits around the star K2-304 every 2.3 days with its orbital distance of 0.03 AU ( 4779431.1 km)
  • (Projected orbit of K2-304 b around its host star K2-304)


  • The Star K2-304 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.463 AU ( 69326164.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.641 AU ( 95826876.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.976 AU ( 146018953.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.436 AU ( 214873287.2 km)
  • Radiation at Planetary Boundary of K2-304 b : 549770.39 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-304)



  • Kopparapu Recent Venus for Star K2-304 distance : 0.497 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-304 distance : 0.629 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-304 distance : 0.608 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-304 distance : 0.667 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-304 distance : 1.133 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-304 distance : 1.195 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-304)



  • Original Kopparapu Recent Venus for Star K2-304 distance : 0.493 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-304 distance : 0.648 AU
  • Original Kopparapu Moist Greenhouse for Star K2-304 distance : 0.652 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-304 distance : 1.152 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-304 distance : 1.198 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-304)



    (Position in Stellar Map of star K2-304 and its Exoplanet K2-304 b)



    (Zoomed position in Stellar Map of star K2-304 and its Exoplanet K2-304 b (zoom level 3))

    (Synthetic Spectrum of star K2-304*)
    *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