Imaginary Picture of K2-229 c

Display orbital revolution of K2-229 c around the hoststar K2-229
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Exoplanet Name : K2-229 c
Alternate Name : "2MASS J12272958-0643188 c, EPIC 228801451 c, EPIC 228801451.02, TYC 4947-834-1 c, WISE J122729.52-064318.6 c"
Status : Confirmed
Radius (Rjup / Re): 0.1810 (Rjup) 2.0288 (Rearth)
Mass (Mjup / Me): 0.0670 (Mjup) 21.3018 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0769 (AU) 0.0769 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0228
Orbital Period(Observed/Estimated) 8.33 (Days Obs.) 8.35 (Days Est.)
Surface Gravity (G Earth) 5.1752
Star Radiation at Atmospheric Boundary: 103280.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 800.1 (K)
Blackbody T 0.3(K) 751.4 (K)
Blackbody T 0.7(K) 607.9 (K)
Tidally Locked Blackbody T 0.1(K) 951.5 (K)
Tidally Locked Blackbody T 0.3(K) 893.6 (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 : K2-229
Alternate Name : "2MASS J12272958-0643188, EPIC 228801451, TYC 4947-834-1, WISE J122729.52-064318.6"
Star Distance(LY) : 334.1
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 5.4 (GY)
Temperature : 5315 (K)
Spectral type : G9
UV portion[%]: 5.9
Visible portion[%]: 41.6
IR portion[%]: 52.5
Metalicity : -0.1
Absolute Magnitude: 4.5
Apparent Magnitude: 9.5
Right Ascension(RA) 186.8733
Declination (DEC) -6.7219
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=K2-229+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-229 c
K2-229 c

  • K2-229 c is an exoplanet orbiting the star K2-229, located about 334.1 light-years (102.4 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-229 has apparent magnitude of 9.5, with absolute magnitude of 4.5.
  • It is 0.9 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5315 with its spectral types of G9
  • In this planetary system, the extrasolar planet K2-229 c orbits around the star K2-229 every 8.3 days with its orbital distance of 0.08 AU ( 11504076.3 km)
  • (Projected orbit of K2-229 c around its host star K2-229)


  • The Star K2-229 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.483 AU ( 72325549.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.668 AU ( 99972810.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.018 AU ( 152336438.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.498 AU ( 224169743.2 km)
  • Radiation at Planetary Boundary of K2-229 c : 103280.75 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-229)



  • Kopparapu Recent Venus for Star K2-229 distance : 0.515 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-229 distance : 0.652 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-229 distance : 0.629 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-229 distance : 0.690 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-229 distance : 1.167 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-229 distance : 1.231 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-229)



  • Original Kopparapu Recent Venus for Star K2-229 distance : 0.511 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-229 distance : 0.671 AU
  • Original Kopparapu Moist Greenhouse for Star K2-229 distance : 0.676 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-229 distance : 1.187 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-229 distance : 1.235 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-229)



    (Position in Stellar Map of star K2-229 and its Exoplanet K2-229 c)



    (Zoomed position in Stellar Map of star K2-229 and its Exoplanet K2-229 c (zoom level 3))

    (Synthetic Spectrum of star K2-229*)
    *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