Imaginary Picture of Kepler-138 c

Display orbital revolution of Kepler-138 c around the hoststar Kepler-138
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Exoplanet Name : Kepler-138 c
Alternate Name : "KOI-314.01, K000314.01, KOI-314 b, KOI-314c, 2MASS J19213157+4317347 c, K00314.01, KIC 7603200 c, WISE J192131.55+43173
Status : Confirmed
Radius (Rjup / Re): 0.1070 (Rjup) 1.1994 (Rearth)
Mass (Mjup / Me): 0.0062 (Mjup) 1.9712 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0905 (AU Est.)
Eccentricity : 0.0500
Orbital Period(Yrs) 0.0377
Orbital Period(Observed/Estimated) 13.78 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.3704
Star Radiation at Atmospheric Boundary: 9464.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 440.2 (K)
Blackbody T 0.3(K) 413.4 (K)
Blackbody T 0.7(K) 334.5 (K)
Tidally Locked Blackbody T 0.1(K) 523.5 (K)
Tidally Locked Blackbody T 0.3(K) 491.6 (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-138
Alternate Name : "KOI-314, 2MASS J19213157+4317347, KIC 7603200, WISE J192131.55+431734.9"
Star Distance(LY) : 218.1
Stellar Radius(Rsun) : 0.5 (Rsun Measured)
Stellar Mass(Msun) : 0.5 (Msun Measured) 0.5 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3847 (K)
Spectral type : M1 V
UV portion[%]: 0.5
Visible portion[%]: 20.3
IR portion[%]: 79.2
Metalicity : -0.3
Absolute Magnitude: 6.2
Apparent Magnitude: 10.3
Right Ascension(RA) 290.3815
Declination (DEC) 43.2930
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Jontof-Hutter,aniel; Rowe,ason.; Lissauer,ack.; Fabrycky,aniel.; Ford,ric."
Discovery Paper - Title The mass of the Mars-sized exoplanet Kepler-138 b from transit timing
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-138+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-138%20b/
Kepler-138 c
Kepler-138 c

  • Kepler-138 c is an exoplanet orbiting the star Kepler-138, located about 218.1 light-years (66.9 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star Kepler-138 has apparent magnitude of 10.3, with absolute magnitude of 6.2.
  • It is 0.5 times more massive and 0.5 times bigger compared with our Sun. The surface temperature is 3847 with its spectral types of M1 V
  • In this planetary system, the extrasolar planet Kepler-138 c orbits around the star Kepler-138 every 13.8 days with its orbital distance of 0.09 AU ( 13532971.5 km)
  • (Projected orbit of Kepler-138 c around its host star Kepler-138)


  • The Star Kepler-138 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.172 AU ( 25755902.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.238 AU ( 35601387.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.363 AU ( 54248636.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.534 AU ( 79829245.3 km)
  • Radiation at Planetary Boundary of Kepler-138 c : 9464.69 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-138)



  • Kopparapu Recent Venus for Star Kepler-138 distance : 0.193 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-138 distance : 0.245 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-138 distance : 0.236 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-138 distance : 0.260 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-138 distance : 0.468 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-138 distance : 0.494 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-138)



  • Original Kopparapu Recent Venus for Star Kepler-138 distance : 0.191 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-138 distance : 0.253 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-138 distance : 0.253 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-138 distance : 0.476 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-138 distance : 0.495 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-138)



    (Position in Stellar Map of star Kepler-138 and its Exoplanet Kepler-138 c)



    (Zoomed position in Stellar Map of star Kepler-138 and its Exoplanet Kepler-138 c (zoom level 3))

    (Synthetic Spectrum of star Kepler-138*)
    *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