Imaginary Picture of Kepler-457 b

Display orbital revolution of Kepler-457 b around the hoststar Kepler-457
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Exoplanet Name : Kepler-457 b
Alternate Name : "KIC 8540376 b, 2MASS J18493060+4441405 b, WISE J184930.60+444140.4 b, Kepler-1803 b"
Status : Confirmed
Radius (Rjup / Re): 0.3700 (Rjup) 4.1473 (Rearth)
Mass (Mjup / Me): 0.0497 (Mjup) 15.7862 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1610 (AU) 0.1610 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0871
Orbital Period(Observed/Estimated) 31.81 (Days Obs.) 22.00 (Days Est.)
Surface Gravity (G Earth) 0.9178
Star Radiation at Atmospheric Boundary: 116361.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 824.3 (K)
Blackbody T 0.3(K) 774.1 (K)
Blackbody T 0.7(K) 626.3 (K)
Tidally Locked Blackbody T 0.1(K) 980.3 (K)
Tidally Locked Blackbody T 0.3(K) 920.6 (K)
Size Class: Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : Kepler-457
Alternate Name : "KIC 8540376, Kepler-1803, KOI-7892, 2MASS J18493060+4441405, WISE J184930.60+444140.4"
Star Distance(LY) : 3496.8
Stellar Radius(Rsun) : 1.2 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 0.6 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 6472 (K)
Spectral type : F8V
UV portion[%]: 0.3
Visible portion[%]: 1.5
IR portion[%]: 98.2
Metalicity : -0.1
Absolute Magnitude: 3.1
Apparent Magnitude: 13.3
Right Ascension(RA) 282.3775
Declination (DEC) 44.6946
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Ji Wang, Debra A. Fischer, Thomas Barclay, Alyssa Picard, Bo Ma, Brendan P. Bowler, Joseph R. Schmitt, Tabetha S. Boyajian, Kian J. Jek, Daryll LaCourse, Christoph Baranec, Reed Riddle, Nicholas M. Law, Chris Lintott, Kevin Schawinski, Dean Joseph Simister, Boscher Gregoire, Sean P. Babin, Trevor Poile, Thomas Lee Jacobs, Tony Jebson, Mark R. Omohundro, Hans Martin Schwengeler, Johann Sejpka, Ivan A.Terentev, Robert Gagliano, Jari-Pekka Paakkonen, Hans Kristian Otnes Berge, Troy Winarski, Gerald R. Green, Allan R. Schmitt, Martti H. Kristiansen, Abe Hoekstra"
Discovery Paper - Title Planet Hunters. VIII. Characterization of 41 Long-Period Exoplanet Candidates from Kepler Archival Data
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK https://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-457&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/KIC%208540376%20b/
Kepler-457 b
Kepler-457 b

  • Kepler-457 b is an exoplanet orbiting the star Kepler-457, located about 3496.8 light-years (1072.1 pc) away from Solar System. Its discovery was publicly announced on 2015.
  • The host star Kepler-457 has apparent magnitude of 13.3, with absolute magnitude of 3.1.
  • It is 1.1 times more massive and 1.2 times bigger compared with our Sun. The surface temperature is 6472 with its spectral types of F8V
  • In this planetary system, the extrasolar planet Kepler-457 b orbits around the star Kepler-457 every 31.8 days with its orbital distance of 0.16 AU ( 24085257.2 km)
  • (Projected orbit of Kepler-457 b around its host star Kepler-457)


  • The Star Kepler-457 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.074 AU ( 160726257.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.485 AU ( 222165690.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.263 AU ( 338531347.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.330 AU ( 498163707.5 km)
  • Radiation at Planetary Boundary of Kepler-457 b : 116361.82 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-457)



  • Kopparapu Recent Venus for Star Kepler-457 distance : 1.068 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-457 distance : 1.352 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-457 distance : 1.306 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-457 distance : 1.431 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-457 distance : 2.354 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-457 distance : 2.482 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-457)



  • Original Kopparapu Recent Venus for Star Kepler-457 distance : 1.085 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-457 distance : 1.387 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-457 distance : 1.436 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-457 distance : 2.396 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-457 distance : 2.492 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-457)



    (Position in Stellar Map of star Kepler-457 and its Exoplanet Kepler-457 b)



    (Zoomed position in Stellar Map of star Kepler-457 and its Exoplanet Kepler-457 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-457*)
    *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