Imaginary Picture of Kepler-171 b

Display orbital revolution of Kepler-171 b around the hoststar Kepler-171
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Exoplanet Name : Kepler-171 b
Alternate Name : "2MASS J19470525+4145199 b, K00509.01, KIC 6381846 b, KOI-509 b, KOI-509.01, WISE J194705.26+414520.2 b"
Status : Confirmed
Radius (Rjup / Re): 0.2090 (Rjup) 2.3427 (Rearth)
Mass (Mjup / Me): 0.0183 (Mjup) 5.8230 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0500 (AU) 0.0500 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0114
Orbital Period(Observed/Estimated) 4.17 (Days Obs.) 5.32 (Days Est.)
Surface Gravity (G Earth) 1.0610
Star Radiation at Atmospheric Boundary: 402467.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1124.2 (K)
Blackbody T 0.3(K) 1055.7 (K)
Blackbody T 0.7(K) 854.2 (K)
Tidally Locked Blackbody T 0.1(K) 1336.9 (K)
Tidally Locked Blackbody T 0.3(K) 1255.4 (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-171
Alternate Name : "2MASS J19470525+4145199, KIC 6381846, KOI-509, WISE J194705.26+414520.2"
Star Distance(LY) : 2817.1
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 0.6 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5529 (K)
Spectral type : G5
UV portion[%]: 7.4
Visible portion[%]: 44.1
IR portion[%]: 48.5
Metalicity : -0.2
Absolute Magnitude: 3.9
Apparent Magnitude: 13.6
Right Ascension(RA) 296.7719
Declination (DEC) 41.7555
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors 0
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-171+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-171%20b/
Kepler-171 b
Kepler-171 b

  • Kepler-171 b is an exoplanet orbiting the star Kepler-171, located about 2817.1 light-years (863.7 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star Kepler-171 has apparent magnitude of 13.6, with absolute magnitude of 3.9.
  • It is 0.6 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5529 with its spectral types of G5
  • In this planetary system, the extrasolar planet Kepler-171 b orbits around the star Kepler-171 every 4.2 days with its orbital distance of 0.05 AU ( 7479893.5 km)
  • (Projected orbit of Kepler-171 b around its host star Kepler-171)


  • The Star Kepler-171 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.621 AU ( 92830541.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.858 AU ( 128316067.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.307 AU ( 195525290.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.923 AU ( 287724031.0 km)
  • Radiation at Planetary Boundary of Kepler-171 b : 402467.06 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-171)



  • Kopparapu Recent Venus for Star Kepler-171 distance : 0.653 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-171 distance : 0.826 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-171 distance : 0.798 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-171 distance : 0.875 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-171 distance : 1.470 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-171 distance : 1.550 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-171)



  • Original Kopparapu Recent Venus for Star Kepler-171 distance : 0.650 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-171 distance : 0.850 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-171 distance : 0.861 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-171 distance : 1.495 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-171 distance : 1.555 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-171)



    (Position in Stellar Map of star Kepler-171 and its Exoplanet Kepler-171 b)



    (Zoomed position in Stellar Map of star Kepler-171 and its Exoplanet Kepler-171 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-171*)
    *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