Imaginary Picture of K2-168 b

Display orbital revolution of K2-168 b around the hoststar K2-168
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Exoplanet Name : K2-168 b
Alternate Name : "2MASS J22122638-1620301 b, EPIC 205950854 b, EPIC 205950854.01, WISE J221226.40-162030.6 b"
Status : Confirmed
Radius (Rjup / Re): 0.1660 (Rjup) 1.8607 (Rearth)
Mass (Mjup / Me): 0.0148 (Mjup) 4.7001 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0979 (AU) 0.0979 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0434
Orbital Period(Observed/Estimated) 15.85 (Days Obs.) 11.93 (Days Est.)
Surface Gravity (G Earth) 1.3576
Star Radiation at Atmospheric Boundary: 80775.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 752.4 (K)
Blackbody T 0.3(K) 706.6 (K)
Blackbody T 0.7(K) 571.7 (K)
Tidally Locked Blackbody T 0.1(K) 894.8 (K)
Tidally Locked Blackbody T 0.3(K) 840.3 (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 : K2-168
Alternate Name : "EPIC 205950854, 2MASS J22122638-1620301, WISE J221226.40-162030.6"
Star Distance(LY) : 795.3
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.5 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5502 (K)
Spectral type : G7
UV portion[%]: 6.9
Visible portion[%]: 43.2
IR portion[%]: 49.9
Metalicity : 0.0
Absolute Magnitude: 5.3
Apparent Magnitude: 12.2
Right Ascension(RA) 333.1099
Declination (DEC) -16.3418
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=K2-168+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-168 b
K2-168 b
  • K2-168 b is an exoplanet orbiting the star K2-168, located about 795.3 light-years (243.8 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-168 has apparent magnitude of 12.2, with absolute magnitude of 5.3.
  • It is 0.9 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5502 with its spectral types of G7
  • In this planetary system, the extrasolar planet K2-168 b orbits around the star K2-168 every 15.9 days with its orbital distance of 0.10 AU ( 14645631.5 km)
    • (Projected orbit of K2-168 b around its host star K2-168)


  • The Star K2-168 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.544 AU ( 81428676.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.752 AU ( 112555711.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.146 AU ( 171509995.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.687 AU ( 252384471.1 km)
  • Radiation at Planetary Boundary of K2-168 b : 80775.18 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-168)



  • Kopparapu Recent Venus for Star K2-168 distance : 0.573 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-168 distance : 0.726 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-168 distance : 0.701 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-168 distance : 0.769 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-168 distance : 1.293 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-168 distance : 1.363 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-168)



  • Original Kopparapu Recent Venus for Star K2-168 distance : 0.571 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-168 distance : 0.747 AU
  • Original Kopparapu Moist Greenhouse for Star K2-168 distance : 0.756 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-168 distance : 1.315 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-168 distance : 1.367 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-168)



    (Position in Stellar Map of star K2-168 and its Exoplanet K2-168 b)



    (Zoomed position in Stellar Map of star K2-168 and its Exoplanet K2-168 b (zoom level 3))

    (Synthetic Spectrum of star K2-168*)
    *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