Imaginary Picture of K2-250 b

Display orbital revolution of K2-250 b around the hoststar K2-250
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Exoplanet Name : K2-250 b
Alternate Name : "2MASS J12200763-0858328 b, EPIC 228748826 b, EPIC 228748826.01, WISE J122007.58-085832.6 b"
Status : Confirmed
Radius (Rjup / Re): 0.2180 (Rjup) 2.4436 (Rearth)
Mass (Mjup / Me): 0.0190 (Mjup) 6.0558 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0459 (AU) 0.0459 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0110
Orbital Period(Observed/Estimated) 4.01 (Days Obs.) 4.02 (Days Est.)
Surface Gravity (G Earth) 1.0142
Star Radiation at Atmospheric Boundary: 273264.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1020.4 (K)
Blackbody T 0.3(K) 958.3 (K)
Blackbody T 0.7(K) 775.4 (K)
Tidally Locked Blackbody T 0.1(K) 1213.5 (K)
Tidally Locked Blackbody T 0.3(K) 1139.6 (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 : K2-250
Alternate Name : "2MASS J12200763-0858328, EPIC 228748826, WISE J122007.58-085832.6"
Star Distance(LY) : 1341.0
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5172 (K)
Spectral type : K1
UV portion[%]: 4.7
Visible portion[%]: 39.7
IR portion[%]: 55.6
Metalicity : -0.1
Absolute Magnitude: 4.5
Apparent Magnitude: 12.5
Right Ascension(RA) 185.0318
Declination (DEC) -8.9758
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK https://simbad.u-strasbg.fr/simbad/sim-basic?Ident=K2-250&submit=SIMBAD+search
Open Exoplanet Database Link
K2-250 b
K2-250 b
  • K2-250 b is an exoplanet orbiting the star K2-250, located about 1341.0 light-years (411.2 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-250 has apparent magnitude of 12.5, with absolute magnitude of 4.5.
  • It is 0.8 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5172 with its spectral types of K1
  • In this planetary system, the extrasolar planet K2-250 b orbits around the star K2-250 every 4.0 days with its orbital distance of 0.05 AU ( 6866542.3 km)
    • (Projected orbit of K2-250 b around its host star K2-250)


  • The Star K2-250 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.469 AU ( 70219893.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.649 AU ( 97062242.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.989 AU ( 147901378.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.455 AU ( 217643357.3 km)
  • Radiation at Planetary Boundary of K2-250 b : 273264.71 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-250)



  • Kopparapu Recent Venus for Star K2-250 distance : 0.503 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-250 distance : 0.637 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-250 distance : 0.616 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-250 distance : 0.676 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-250 distance : 1.148 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-250 distance : 1.211 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-250)



  • Original Kopparapu Recent Venus for Star K2-250 distance : 0.499 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-250 distance : 0.656 AU
  • Original Kopparapu Moist Greenhouse for Star K2-250 distance : 0.660 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-250 distance : 1.167 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-250 distance : 1.214 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-250)



    (Position in Stellar Map of star K2-250 and its Exoplanet K2-250 b)



    (Zoomed position in Stellar Map of star K2-250 and its Exoplanet K2-250 b (zoom level 3))

    (Synthetic Spectrum of star K2-250*)
    *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