Imaginary Picture of Kepler-26 d

Display orbital revolution of Kepler-26 d around the hoststar Kepler-26
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Exoplanet Name : Kepler-26 d
Alternate Name : "KOI-250 d, KIC 9757613 d, 2MASS J18594583+4633595 d, K00250.03, KOI-250.03, WISE J185945.85+463359.3 d"
Radius (Rjup / Re): 0.0950 (Rjup) 1.0649 (Rearth)
Mass (Mjup / Me): 0.0039 (Mjup) 1.2258 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0390 (AU) 0.0390 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0097
Orbital Period(Observed/Estimated) 3.54 (Days Obs.) 3.83 (Days Est.)
Surface Gravity (G Earth) 1.0811
Star Radiation at Atmospheric Boundary: 67381.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 719.1 (K)
Blackbody T 0.3(K) 675.3 (K)
Blackbody T 0.7(K) 546.4 (K)
Tidally Locked Blackbody T 0.1(K) 855.1 (K)
Tidally Locked Blackbody T 0.3(K) 803.1 (K)
Size Class: 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-26
Alternate Name : "2MASS J18594583+4633595, KIC 9757613, KOI-250, WISE J185945.85+463359.3"
Star Distance(LY) : 1093.4
Stellar Radius(Rsun) : 0.6 (Rsun Measured)
Stellar Mass(Msun) : 0.5 (Msun Measured) 0.6 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3884 (K)
Spectral type : M0 V
UV portion[%]: 0.6
Visible portion[%]: 22.1
IR portion[%]: 77.3
Metalicity : -0.1
Absolute Magnitude: 8.4
Apparent Magnitude: 16.0
Right Ascension(RA) 284.9410
Declination (DEC) 46.5665
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
Kepler-26 d
Kepler-26 d

  • Kepler-26 d is an exoplanet orbiting the star Kepler-26, located about 1093.4 light-years (335.2 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star Kepler-26 has apparent magnitude of 16.0, with absolute magnitude of 8.4.
  • It is 0.5 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 3884 with its spectral types of M0 V
  • In this planetary system, the extrasolar planet Kepler-26 d orbits around the star Kepler-26 every 3.5 days with its orbital distance of 0.04 AU ( 5834317.0 km)
  • (Projected orbit of Kepler-26 d around its host star Kepler-26)


  • The Star Kepler-26 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.198 AU ( 29627102.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.274 AU ( 40952398.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.417 AU ( 62402391.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.614 AU ( 91827853.3 km)
  • Radiation at Planetary Boundary of Kepler-26 d : 67381.04 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-26)



  • Kopparapu Recent Venus for Star Kepler-26 distance : 0.222 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-26 distance : 0.281 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-26 distance : 0.272 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-26 distance : 0.299 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-26 distance : 0.537 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-26 distance : 0.567 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-26)



  • Original Kopparapu Recent Venus for Star Kepler-26 distance : 0.220 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-26 distance : 0.291 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-26 distance : 0.291 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-26 distance : 0.546 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-26 distance : 0.568 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-26)



    (Position in Stellar Map of star Kepler-26 and its Exoplanet Kepler-26 d)



    (Zoomed position in Stellar Map of star Kepler-26 and its Exoplanet Kepler-26 d (zoom level 3))

    (Synthetic Spectrum of star Kepler-26*)
    *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