Imaginary Picture of Kepler-638 b

Display orbital revolution of Kepler-638 b around the hoststar Kepler-638
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Exoplanet Name : Kepler-638 b
Alternate Name : "2MASS J18594066+4137019 b, K00660.01, KIC 6267535 b, KOI-660 b, KOI-660.01, WISE J185940.65+413701.9 b"
Status : Confirmed
Radius (Rjup / Re): 0.1630 (Rjup) 1.8271 (Rearth)
Mass (Mjup / Me): 0.0145 (Mjup) 4.6211 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0625 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0166
Orbital Period(Observed/Estimated) 6.08 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.3843
Star Radiation at Atmospheric Boundary: 1220409.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1483.4 (K)
Blackbody T 0.3(K) 1393.1 (K)
Blackbody T 0.7(K) 1127.2 (K)
Tidally Locked Blackbody T 0.1(K) 1764.1 (K)
Tidally Locked Blackbody T 0.3(K) 1656.7 (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-638
Alternate Name : "2MASS J18594066+4137019, KIC 6267535, KOI-660, WISE J185940.65+413701.9"
Star Distance(LY) : 3231.3
Stellar Radius(Rsun) : 2.2 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 11.8 (GY)
Temperature : 5320 (K)
Spectral type : G7
UV portion[%]: 6.3
Visible portion[%]: 42.3
IR portion[%]: 51.4
Metalicity : 0.0
Absolute Magnitude: 2.2
Apparent Magnitude: 12.2
Right Ascension(RA) 284.9194
Declination (DEC) 41.6172
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Timothy D. Morton, Stephen T. Bryson, Jeffrey L. Coughlin, Jason F. Rowe, Ganesh Ravichandran, Erik A. Petigura, Michael R. Haas, and Natalie M. Batalha"
Discovery Paper - Title FALSE POSITIVE PROBABILITIES FOR ALL KEPLER OBJECTS OF INTEREST: 1284 NEWLY VALIDATED PLANETS AND 552 LIKELY FALSE POSITIVES
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-638%20b/
Kepler-638 b
Kepler-638 b

  • Kepler-638 b is an exoplanet orbiting the star Kepler-638, located about 3231.3 light-years (990.7 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-638 has apparent magnitude of 12.2, with absolute magnitude of 2.2.
  • It is 0.9 times more massive and 2.2 times bigger compared with our Sun. The surface temperature is 5320 with its spectral types of G7
  • In this planetary system, the extrasolar planet Kepler-638 b orbits around the star Kepler-638 every 6.1 days with its orbital distance of 0.06 AU ( 9345781.6 km)
  • (Projected orbit of Kepler-638 b around its host star Kepler-638)


  • The Star Kepler-638 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.350 AU ( 201975499.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.866 AU ( 279182923.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.844 AU ( 425412992.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 4.185 AU ( 626013854.1 km)
  • Radiation at Planetary Boundary of Kepler-638 b : 1220409.38 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-638)



  • Kopparapu Recent Venus for Star Kepler-638 distance : 1.437 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-638 distance : 1.819 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-638 distance : 1.757 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-638 distance : 1.928 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-638 distance : 3.258 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-638 distance : 3.437 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-638)



  • Original Kopparapu Recent Venus for Star Kepler-638 distance : 1.427 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-638 distance : 1.873 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-638 distance : 1.888 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-638 distance : 3.314 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-638 distance : 3.446 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-638)



    (Position in Stellar Map of star Kepler-638 and its Exoplanet Kepler-638 b)



    (Zoomed position in Stellar Map of star Kepler-638 and its Exoplanet Kepler-638 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-638*)
    *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