Imaginary Picture of K2-126 b

Display orbital revolution of K2-126 b around the hoststar K2-126
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Exoplanet Name : K2-126 b
Alternate Name : "EPIC 212460519 b, 2MASS J13341115-1334370 b, EPIC 212460519.01, WISE J133411.19-133437.0 b"
Status : Confirmed
Radius (Rjup / Re): 0.1760 (Rjup) 1.9728 (Rearth)
Mass (Mjup / Me): 0.0156 (Mjup) 4.9629 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0656 (AU) 0.0656 (AU Est.)
Eccentricity : 0.0600
Orbital Period(Yrs) 0.0202
Orbital Period(Observed/Estimated) 7.39 (Days Obs.) 7.39 (Days Est.)
Surface Gravity (G Earth) 1.2752
Star Radiation at Atmospheric Boundary: 42675.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 641.5 (K)
Blackbody T 0.3(K) 602.4 (K)
Blackbody T 0.7(K) 487.4 (K)
Tidally Locked Blackbody T 0.1(K) 762.9 (K)
Tidally Locked Blackbody T 0.3(K) 716.4 (K)
Size Class: sub-Neptune-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 : K2-126
Alternate Name : "EPIC 212460519, 2MASS J13341115-1334370, WISE J133411.19-133437.0"
Star Distance(LY) : 336.8
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.7 (Msun Measured) 0.7 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4339 (K)
Spectral type : K7V
UV portion[%]: 1.0
Visible portion[%]: 28.2
IR portion[%]: 70.8
Metalicity : 0.0
Absolute Magnitude: 5.4
Apparent Magnitude: 10.5
Right Ascension(RA) 203.5465
Declination (DEC) -13.5769
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=K2-126+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-126 b
K2-126 b

  • K2-126 b is an exoplanet orbiting the star K2-126, located about 336.8 light-years (103.3 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star K2-126 has apparent magnitude of 10.5, with absolute magnitude of 5.4.
  • It is 0.7 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4339 with its spectral types of K7V
  • In this planetary system, the extrasolar planet K2-126 b orbits around the star K2-126 every 7.4 days with its orbital distance of 0.07 AU ( 9813620.3 km)
  • (Projected orbit of K2-126 b around its host star K2-126)


  • The Star K2-126 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.265 AU ( 39659822.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.366 AU ( 54820239.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.558 AU ( 83533913.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.822 AU ( 122923812.7 km)
  • Radiation at Planetary Boundary of K2-126 b : 42675.88 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-126)



  • Kopparapu Recent Venus for Star K2-126 distance : 0.294 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-126 distance : 0.373 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-126 distance : 0.360 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-126 distance : 0.395 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-126 distance : 0.695 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-126 distance : 0.734 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-126)



  • Original Kopparapu Recent Venus for Star K2-126 distance : 0.290 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-126 distance : 0.385 AU
  • Original Kopparapu Moist Greenhouse for Star K2-126 distance : 0.384 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-126 distance : 0.707 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-126 distance : 0.735 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-126)



    (Position in Stellar Map of star K2-126 and its Exoplanet K2-126 b)



    (Zoomed position in Stellar Map of star K2-126 and its Exoplanet K2-126 b (zoom level 3))

    (Synthetic Spectrum of star K2-126*)
    *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