Imaginary Picture of Kepler-644 b

Display orbital revolution of Kepler-644 b around the hoststar Kepler-644
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Exoplanet Name : Kepler-644 b
Alternate Name : "2MASS J19415417+4329352 b, K00685.01, KIC 7764367 b, KOI-68
Radius (Rjup / Re): 0.2810 (Rjup) 3.1497 (Rearth)
Mass (Mjup / Me): 0.0241 (Mjup) 7.6684 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0483 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0087
Orbital Period(Observed/Estimated) 3.17 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 0.7730
Star Radiation at Atmospheric Boundary: 3032828.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1862.5 (K)
Blackbody T 0.3(K) 1749.1 (K)
Blackbody T 0.7(K) 1415.2 (K)
Tidally Locked Blackbody T 0.1(K) 2214.9 (K)
Tidally Locked Blackbody T 0.3(K) 2080.1 (K)
Size Class: 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-644
Alternate Name : "2MASS J19415417+4329352, KIC 7764367, KOI-685, WISE J194154.16+DĒr\@IE@H/<&@
Star Distance(LY) : 4298.9
Stellar Radius(Rsun) : 1.8 (Rsun Measured)
Stellar Mass(Msun) : 1.5 (Msun Measured) 1.5 (Msun Estimated)
Star Age : 1.6 (GY)
Temperature : 6540 (K)
Spectral type : F4
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : 0.1
Absolute Magnitude: 2.3
Apparent Magnitude: 12.9
Right Ascension(RA) 295.4757
Declination (DEC) 43.4931
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 557 LIKELY FALSE POSITIVES
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-644%20b/
Kepler-644 b
Kepler-644 b

  • Kepler-644 b is an exoplanet orbiting the star Kepler-644, located about 4298.9 light-years (1318.0 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-644 has apparent magnitude of 12.9, with absolute magnitude of 2.3.
  • It is 1.5 times more massive and 1.8 times bigger compared with our Sun. The surface temperature is 6540 with its spectral types of F4
  • In this planetary system, the extrasolar planet Kepler-644 b orbits around the star Kepler-644 every 3.2 days with its orbital distance of 0.05 AU ( 7222004.2 km)
  • (Projected orbit of Kepler-644 b around its host star Kepler-644)


  • The Star Kepler-644 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.645 AU ( 246043539.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 2.273 AU ( 340096470.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 3.464 AU ( 518231758.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 5.098 AU ( 762600734.7 km)
  • Radiation at Planetary Boundary of Kepler-644 b : 3032828.60 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-644)



  • Kopparapu Recent Venus for Star Kepler-644 distance : 1.628 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-644 distance : 2.062 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-644 distance : 1.991 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-644 distance : 2.182 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-644 distance : 3.585 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-644 distance : 3.781 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-644)



  • Original Kopparapu Recent Venus for Star Kepler-644 distance : 1.658 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-644 distance : 2.114 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-644 distance : 2.193 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-644 distance : 3.650 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-644 distance : 3.796 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-644)



    (Position in Stellar Map of star Kepler-644 and its Exoplanet Kepler-644 b)



    (Zoomed position in Stellar Map of star Kepler-644 and its Exoplanet Kepler-644 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-644*)
    *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