Imaginary Picture of K2-315 b

Display orbital revolution of K2-315 b around the hoststar K2-315
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Exoplanet Name : K2-315 b
Alternate Name : "K2-*** b, 2MASS J15120519-2006307 b, EPIC 249631677 b, TIC 70298662 b, WISE J151205.10-200629.7 b"
Status : Confirmed
Radius (Rjup / Re): 0.0850 (Rjup) 0.9528 (Rearth)
Mass (Mjup / Me): 0.0026 (Mjup) 0.8233 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0234 (AU) 0.0234 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0086
Orbital Period(Observed/Estimated) 3.14 (Days Obs.) 3.17 (Days Est.)
Surface Gravity (G Earth) 0.9069
Star Radiation at Atmospheric Boundary: 10624.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 453.1 (K)
Blackbody T 0.3(K) 425.5 (K)
Blackbody T 0.7(K) 344.3 (K)
Tidally Locked Blackbody T 0.1(K) 538.9 (K)
Tidally Locked Blackbody T 0.3(K) 506.0 (K)
Size Class: Earth-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-315
Alternate Name : "K2-***, 2MASS J15120519-2006307, EPIC 249631677, TIC 70298662, WISE J151205.10-200629.7"
Star Distance(LY) : 186.1
Stellar Radius(Rsun) : 0.2 (Rsun Measured)
Stellar Mass(Msun) : 0.2 (Msun Measured) 0.2 (Msun Estimated)
Star Age : 1.0 (GY)
Temperature : 3300 (K)
Spectral type : M(3.5+/-0.5) V
UV portion[%]: 0.2
Visible portion[%]: 11.2
IR portion[%]: 88.6
Metalicity : -0.2
Absolute Magnitude: 14.2
Apparent Magnitude: 18.0
Right Ascension(RA) 228.0217
Declination (DEC) -20.1085
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=K2-315+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-315 b
K2-315 b

  • K2-315 b is an exoplanet orbiting the star K2-315, located about 186.1 light-years (57.1 pc) away from Solar System. Its discovery was publicly announced on 2020.
  • The host star K2-315 has apparent magnitude of 18.0, with absolute magnitude of 14.2.
  • It is 0.2 times more massive and 0.2 times bigger compared with our Sun. The surface temperature is 3300 with its spectral types of M(3.5+/-0.5) V
  • In this planetary system, the extrasolar planet K2-315 b orbits around the star K2-315 every 3.1 days with its orbital distance of 0.02 AU ( 3500590.2 km)
  • (Projected orbit of K2-315 b around its host star K2-315)


  • The Star K2-315 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.047 AU ( 7058558.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.065 AU ( 9756771.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.099 AU ( 14867161.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.146 AU ( 21877678.7 km)
  • Radiation at Planetary Boundary of K2-315 b : 10624.02 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-315)



  • Kopparapu Recent Venus for Star K2-315 distance : 0.053 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-315 distance : 0.068 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-315 distance : 0.065 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-315 distance : 0.072 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-315 distance : 0.133 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-315 distance : 0.140 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-315)



  • Original Kopparapu Recent Venus for Star K2-315 distance : 0.053 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-315 distance : 0.070 AU
  • Original Kopparapu Moist Greenhouse for Star K2-315 distance : 0.070 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-315 distance : 0.135 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-315 distance : 0.140 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-315)



    (Position in Stellar Map of star K2-315 and its Exoplanet K2-315 b)



    (Zoomed position in Stellar Map of star K2-315 and its Exoplanet K2-315 b (zoom level 3))

    (Synthetic Spectrum of star K2-315*)
    *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