Imaginary Picture of K2-242 b

Display orbital revolution of K2-242 b around the hoststar K2-242
/
Exoplanet Name : K2-242 b
Alternate Name : "2MASS J11592060-0631042 b, EPIC 201102594 b, EPIC 201102594.01"
Status : Confirmed
Radius (Rjup / Re): 0.2270 (Rjup) 2.5444 (Rearth)
Mass (Mjup / Me): 0.0198 (Mjup) 6.2880 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0494 (AU) 0.0494 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0178
Orbital Period(Observed/Estimated) 6.51 (Days Obs.) 6.51 (Days Est.)
Surface Gravity (G Earth) 0.9712
Star Radiation at Atmospheric Boundary: 9848.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 444.6 (K)
Blackbody T 0.3(K) 417.5 (K)
Blackbody T 0.7(K) 337.8 (K)
Tidally Locked Blackbody T 0.1(K) 528.7 (K)
Tidally Locked Blackbody T 0.3(K) 496.5 (K)
Size Class: sub-Neptune-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 : K2-242
Alternate Name : "2MASS J11592060-0631042, EPIC 201102594"
Star Distance(LY) : 357.5
Stellar Radius(Rsun) : 0.4 (Rsun Measured)
Stellar Mass(Msun) : 0.4 (Msun Measured) 0.4 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3459 (K)
Spectral type : M4
UV portion[%]: 0.3
Visible portion[%]: 13.4
IR portion[%]: 86.3
Metalicity : -0.0
Absolute Magnitude: 7.4
Apparent Magnitude: 12.6
Right Ascension(RA) 179.8359
Declination (DEC) -6.5179
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK
Open Exoplanet Database Link
K2-242 b
K2-242 b

  • K2-242 b is an exoplanet orbiting the star K2-242, located about 357.5 light-years (109.6 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-242 has apparent magnitude of 12.6, with absolute magnitude of 7.4.
  • It is 0.4 times more massive and 0.4 times bigger compared with our Sun. The surface temperature is 3459 with its spectral types of M4
  • In this planetary system, the extrasolar planet K2-242 b orbits around the star K2-242 every 6.5 days with its orbital distance of 0.05 AU ( 7390134.8 km)
  • (Projected orbit of K2-242 b around its host star K2-242)


  • The Star K2-242 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.096 AU ( 14346995.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.133 AU ( 19831297.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.202 AU ( 30218508.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.297 AU ( 44467858.3 km)
  • Radiation at Planetary Boundary of K2-242 b : 9848.19 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-242)



  • Kopparapu Recent Venus for Star K2-242 distance : 0.108 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-242 distance : 0.137 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-242 distance : 0.132 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-242 distance : 0.146 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-242 distance : 0.267 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-242 distance : 0.282 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-242)



  • Original Kopparapu Recent Venus for Star K2-242 distance : 0.108 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-242 distance : 0.142 AU
  • Original Kopparapu Moist Greenhouse for Star K2-242 distance : 0.142 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-242 distance : 0.272 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-242 distance : 0.283 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-242)



    (Position in Stellar Map of star K2-242 and its Exoplanet K2-242 b)



    (Zoomed position in Stellar Map of star K2-242 and its Exoplanet K2-242 b (zoom level 3))

    (Synthetic Spectrum of star K2-242*)
    *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