Imaginary Picture of K2-233 d

Display orbital revolution of K2-233 d around the hoststar K2-233
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Exoplanet Name : K2-233 d
Alternate Name : "2MASS J15215519-2013539 d, EPIC 249622103 d, TYC 6179-186-1 d, WISE J152155.18-201354.2 d"
Status : Confirmed
Radius (Rjup / Re): 0.2360 (Rjup) 2.6453 (Rearth)
Mass (Mjup / Me): 0.0261 (Mjup) 8.2982 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1527 (AU) 0.1527 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0667
Orbital Period(Observed/Estimated) 24.37 (Days Obs.) 24.37 (Days Est.)
Surface Gravity (G Earth) 1.1858
Star Radiation at Atmospheric Boundary: 17290.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 511.8 (K)
Blackbody T 0.3(K) 480.6 (K)
Blackbody T 0.7(K) 388.9 (K)
Tidally Locked Blackbody T 0.1(K) 608.6 (K)
Tidally Locked Blackbody T 0.3(K) 571.6 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-233
Alternate Name : "EPIC 249622103, 2MASS J15215519-2013539, TYC 6179-186-1, WISE J152155.18-201354.2"
Star Distance(LY) : 220.8
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 0.4 (GY)
Temperature : 4950 (K)
Spectral type : K3
UV portion[%]: 3.0
Visible portion[%]: 36.6
IR portion[%]: 60.4
Metalicity : 0.1
Absolute Magnitude: 5.8
Apparent Magnitude: 10.0
Right Ascension(RA) 230.4800
Declination (DEC) -20.2317
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=K2-233&submit=SIMBAD+search
Open Exoplanet Database Link
K2-233 d
K2-233 d
  • K2-233 d is an exoplanet orbiting the star K2-233, located about 220.8 light-years (67.7 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-233 has apparent magnitude of 10.0, with absolute magnitude of 5.8.
  • It is 0.8 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4950 with its spectral types of K3
  • In this planetary system, the extrasolar planet K2-233 d orbits around the star K2-233 every 24.4 days with its orbital distance of 0.15 AU ( 22843594.9 km)
    • (Projected orbit of K2-233 d around its host star K2-233)


  • The Star K2-233 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.393 AU ( 58762495.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.543 AU ( 81225125.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.827 AU ( 123769115.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.217 AU ( 182131675.5 km)
  • Radiation at Planetary Boundary of K2-233 d : 17290.64 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-233)



  • Kopparapu Recent Venus for Star K2-233 distance : 0.426 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-233 distance : 0.539 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-233 distance : 0.521 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-233 distance : 0.572 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-233 distance : 0.979 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-233 distance : 1.033 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-233)



  • Original Kopparapu Recent Venus for Star K2-233 distance : 0.421 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-233 distance : 0.556 AU
  • Original Kopparapu Moist Greenhouse for Star K2-233 distance : 0.557 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-233 distance : 0.996 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-233 distance : 1.036 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-233)



    (Position in Stellar Map of star K2-233 and its Exoplanet K2-233 d)



    (Zoomed position in Stellar Map of star K2-233 and its Exoplanet K2-233 d (zoom level 3))

    (Synthetic Spectrum of star K2-233*)
    *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