Imaginary Picture of Kepler-255 d

Display orbital revolution of Kepler-255 d around the hoststar Kepler-255
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Exoplanet Name : Kepler-255 d
Alternate Name : "2MASS J19441541+4558366 d, K00938.02, KIC 9415172 d, KOI-938 d, KOI-938.02, WISE J194415.42+455836.4 d"
Status : Confirmed
Radius (Rjup / Re): 0.1180 (Rjup) 1.3227 (Rearth)
Mass (Mjup / Me): 0.0084 (Mjup) 2.6861 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0200 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0029
Orbital Period(Observed/Estimated) 1.05 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.5354
Star Radiation at Atmospheric Boundary: 2133830.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1705.8 (K)
Blackbody T 0.3(K) 1601.9 (K)
Blackbody T 0.7(K) 1296.1 (K)
Tidally Locked Blackbody T 0.1(K) 2028.6 (K)
Tidally Locked Blackbody T 0.3(K) 1905.0 (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 : Kepler-255
Alternate Name : "2MASS J19441541+4558366, KIC 9415172, KOI-938, WISE J194415.42+455836.4"
Star Distance(LY) : 3434.7
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5332 (K)
Spectral type : G6
UV portion[%]: 7.2
Visible portion[%]: 43.7
IR portion[%]: 49.1
Metalicity : 0.2
Absolute Magnitude: 4.1
Apparent Magnitude: 14.2
Right Ascension(RA) 296.0642
Declination (DEC) 45.9768
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors 0
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-255+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-255%20d/
Kepler-255 d
Kepler-255 d

  • Kepler-255 d is an exoplanet orbiting the star Kepler-255, located about 3434.7 light-years (1053.1 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-255 has apparent magnitude of 14.2, with absolute magnitude of 4.1.
  • It is 1.0 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5332 with its spectral types of G6
  • In this planetary system, the extrasolar planet Kepler-255 d orbits around the star Kepler-255 every 1.0 days with its orbital distance of 0.02 AU ( 2985651.9 km)
  • (Projected orbit of Kepler-255 d around its host star Kepler-255)


  • The Star Kepler-255 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.570 AU ( 85319712.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.788 AU ( 117934138.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.201 AU ( 179705528.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.768 AU ( 264444557.6 km)
  • Radiation at Planetary Boundary of Kepler-255 d : 2133830.12 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-255)



  • Kopparapu Recent Venus for Star Kepler-255 distance : 0.607 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-255 distance : 0.768 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-255 distance : 0.742 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-255 distance : 0.814 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-255 distance : 1.375 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-255 distance : 1.450 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-255)



  • Original Kopparapu Recent Venus for Star Kepler-255 distance : 0.603 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-255 distance : 0.790 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-255 distance : 0.797 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-255 distance : 1.398 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-255 distance : 1.454 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-255)



    (Position in Stellar Map of star Kepler-255 and its Exoplanet Kepler-255 d)



    (Zoomed position in Stellar Map of star Kepler-255 and its Exoplanet Kepler-255 d (zoom level 3))

    (Synthetic Spectrum of star Kepler-255*)
    *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