Imaginary Picture of Kepler-645 b

Display orbital revolution of Kepler-645 b around the hoststar Kepler-645
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Exoplanet Name : Kepler-645 b
Alternate Name : "2MASS J19211746+4402089 b, K00688.01, KIC 8161561 b, KOI-688 b, KOI-688.01, WISE J192117.47+440208.8 b"
Status : Confirmed
Radius (Rjup / Re): 0.1870 (Rjup) 2.0961 (Rearth)
Mass (Mjup / Me): 0.0165 (Mjup) 5.2508 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0450 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0090
Orbital Period(Observed/Estimated) 3.28 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.1951
Star Radiation at Atmospheric Boundary: 2214871.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1721.8 (K)
Blackbody T 0.3(K) 1616.9 (K)
Blackbody T 0.7(K) 1308.3 (K)
Tidally Locked Blackbody T 0.1(K) 2047.6 (K)
Tidally Locked Blackbody T 0.3(K) 1922.9 (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-645
Alternate Name : "2MASS J19211746+4402089, KIC 8161561, KOI-688, WISE J192117.47+440208.8"
Star Distance(LY) : 3825.9
Stellar Radius(Rsun) : 1.6 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 3.0 (GY)
Temperature : 6192 (K)
Spectral type : G0
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : -0.0
Absolute Magnitude: 2.6
Apparent Magnitude: 12.9
Right Ascension(RA) 290.3228
Declination (DEC) 44.0358
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 558 LIKELY FALSE POSITIVES
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-645%20b/
Kepler-645 b
Kepler-645 b

  • Kepler-645 b is an exoplanet orbiting the star Kepler-645, located about 3825.9 light-years (1173.0 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-645 has apparent magnitude of 12.9, 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 6192 with its spectral types of G0
  • In this planetary system, the extrasolar planet Kepler-645 b orbits around the star Kepler-645 every 3.3 days with its orbital distance of 0.04 AU ( 6726229.2 km)
  • (Projected orbit of Kepler-645 b around its host star Kepler-645)


  • The Star Kepler-645 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.309 AU ( 195828645.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.809 AU ( 270686364.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.757 AU ( 412466117.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 4.057 AU ( 606961960.5 km)
  • Radiation at Planetary Boundary of Kepler-645 b : 2214871.47 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-645)



  • Kopparapu Recent Venus for Star Kepler-645 distance : 1.323 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-645 distance : 1.676 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-645 distance : 1.618 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-645 distance : 1.773 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-645 distance : 2.930 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-645 distance : 3.091 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-645)



  • Original Kopparapu Recent Venus for Star Kepler-645 distance : 1.336 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-645 distance : 1.719 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-645 distance : 1.768 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-645 distance : 2.983 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-645 distance : 3.102 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-645)



    (Position in Stellar Map of star Kepler-645 and its Exoplanet Kepler-645 b)



    (Zoomed position in Stellar Map of star Kepler-645 and its Exoplanet Kepler-645 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-645*)
    *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