Imaginary Picture of Kepler-639 b

Display orbital revolution of Kepler-639 b around the hoststar Kepler-639
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Exoplanet Name : Kepler-639 b
Alternate Name : "2MASS J19284485+4143373 b, K00662.01, KIC 6365156 b, KOI-662 b, KOI-662.01, WISE J192844.84+414337.1 b"
Status : Confirmed
Radius (Rjup / Re): 0.2120 (Rjup) 2.3763 (Rearth)
Mass (Mjup / Me): 0.0186 (Mjup) 5.9007 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0962 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0280
Orbital Period(Observed/Estimated) 10.21 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.0450
Star Radiation at Atmospheric Boundary: 406964.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1127.3 (K)
Blackbody T 0.3(K) 1058.6 (K)
Blackbody T 0.7(K) 856.5 (K)
Tidally Locked Blackbody T 0.1(K) 1340.6 (K)
Tidally Locked Blackbody T 0.3(K) 1258.9 (K)
Size Class: sub-Neptune-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-639
Alternate Name : "2MASS J19284485+4143373, KIC 6365156, KOI-662, WISE J192844.84+414337.1"
Star Distance(LY) : 2771.6
Stellar Radius(Rsun) : 1.6 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 4.4 (GY)
Temperature : 5834 (K)
Spectral type : G1
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : 0.2
Absolute Magnitude: 2.6
Apparent Magnitude: 12.2
Right Ascension(RA) 292.1869
Declination (DEC) 41.7270
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 553 LIKELY FALSE POSITIVES
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-639%20b/
Kepler-639 b
Kepler-639 b

  • Kepler-639 b is an exoplanet orbiting the star Kepler-639, located about 2771.6 light-years (849.8 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-639 has apparent magnitude of 12.2, with absolute magnitude of 2.6.
  • It is 1.1 times more massive and 1.6 times bigger compared with our Sun. The surface temperature is 5834 with its spectral types of G1
  • In this planetary system, the extrasolar planet Kepler-639 b orbits around the star Kepler-639 every 10.2 days with its orbital distance of 0.10 AU ( 14398036.1 km)
  • (Projected orbit of Kepler-639 b around its host star Kepler-639)


  • The Star Kepler-639 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.201 AU ( 179685092.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.660 AU ( 248371754.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.530 AU ( 378463589.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.723 AU ( 556925751.0 km)
  • Radiation at Planetary Boundary of Kepler-639 b : 406964.93 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-639)



  • Kopparapu Recent Venus for Star Kepler-639 distance : 1.241 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-639 distance : 1.571 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-639 distance : 1.517 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-639 distance : 1.664 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-639 distance : 2.770 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-639 distance : 2.922 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-639)



  • Original Kopparapu Recent Venus for Star Kepler-639 distance : 1.244 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-639 distance : 1.614 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-639 distance : 1.646 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-639 distance : 2.819 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-639 distance : 2.932 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-639)



    (Position in Stellar Map of star Kepler-639 and its Exoplanet Kepler-639 b)



    (Zoomed position in Stellar Map of star Kepler-639 and its Exoplanet Kepler-639 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-639*)
    *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