Imaginary Picture of Kepler-1688 b

Display orbital revolution of Kepler-1688 b around the hoststar Kepler-1688
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Exoplanet Name : Kepler-1688 b
Alternate Name : "2MASS J19181271+4117522 b, K02733.01, KIC 5953297 b, KOI-2733 b, KOI-2733.01, WISE J191812.71+411752.2 b"
Status : Confirmed
Radius (Rjup / Re): 0.1130 (Rjup) 1.2666 (Rearth)
Mass (Mjup / Me): 0.0072 (Mjup) 2.2946 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0608 (AU) 0.0608 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0154
Orbital Period(Observed/Estimated) 5.62 (Days Obs.) 5.62 (Days Est.)
Surface Gravity (G Earth) 1.4303
Star Radiation at Atmospheric Boundary: 656598.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1270.5 (K)
Blackbody T 0.3(K) 1193.1 (K)
Blackbody T 0.7(K) 965.4 (K)
Tidally Locked Blackbody T 0.1(K) 1510.9 (K)
Tidally Locked Blackbody T 0.3(K) 1418.9 (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-1688
Alternate Name : "5953297, 2MASS J19181271+4117522, KIC 5953297, KOI-2733, WISE J191812.71+411752.2"
Star Distance(LY) : 1850.8
Stellar Radius(Rsun) : 1.8 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4936 (K)
Spectral type : K2
UV portion[%]: 2.9
Visible portion[%]: 36.4
IR portion[%]: 60.6
Metalicity : 0.2
Absolute Magnitude: 4.9
Apparent Magnitude: 13.6
Right Ascension(RA) 289.5530
Declination (DEC) 41.2979
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-1688+&submit=SIMBAD+search
Open Exoplanet Database Link
Kepler-1688 b
Kepler-1688 b

  • Kepler-1688 b is an exoplanet orbiting the star Kepler-1688, located about 1850.8 light-years (567.5 pc) away from Solar System. Its discovery was publicly announced on 2020.
  • The host star Kepler-1688 has apparent magnitude of 13.6, with absolute magnitude of 4.9.
  • It is 0.9 times more massive and 1.8 times bigger compared with our Sun. The surface temperature is 4936 with its spectral types of K2
  • In this planetary system, the extrasolar planet Kepler-1688 b orbits around the star Kepler-1688 every 5.6 days with its orbital distance of 0.06 AU ( 9095550.5 km)
  • (Projected orbit of Kepler-1688 b around its host star Kepler-1688)


  • The Star Kepler-1688 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.964 AU ( 144181383.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.332 AU ( 199296350.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.030 AU ( 303683534.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.987 AU ( 446883624.3 km)
  • Radiation at Planetary Boundary of Kepler-1688 b : 656598.37 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1688)



  • Kopparapu Recent Venus for Star Kepler-1688 distance : 1.046 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-1688 distance : 1.324 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1688 distance : 1.279 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-1688 distance : 1.404 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1688 distance : 2.406 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-1688 distance : 2.538 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1688)



  • Original Kopparapu Recent Venus for Star Kepler-1688 distance : 1.034 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1688 distance : 1.365 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1688 distance : 1.368 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1688 distance : 2.446 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1688 distance : 2.544 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1688)



    (Position in Stellar Map of star Kepler-1688 and its Exoplanet Kepler-1688 b)



    (Zoomed position in Stellar Map of star Kepler-1688 and its Exoplanet Kepler-1688 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-1688*)
    *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