Imaginary Picture of Kepler-457 c

Display orbital revolution of Kepler-457 c around the hoststar Kepler-457
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Exoplanet Name : Kepler-457 c
Alternate Name : "KIC 8540376 c, Kepler-1803 c"
Status : Confirmed
Radius (Rjup / Re): 0.2100 (Rjup) 2.3539 (Rearth)
Mass (Mjup / Me): 0.0184 (Mjup) 5.8489 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.3654 (AU) 0.3654 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.2059
Orbital Period(Observed/Estimated) 75.20 (Days Obs.) 75.23 (Days Est.)
Surface Gravity (G Earth) 1.0556
Star Radiation at Atmospheric Boundary: 22590.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 547.2 (K)
Blackbody T 0.3(K) 513.9 (K)
Blackbody T 0.7(K) 415.8 (K)
Tidally Locked Blackbody T 0.1(K) 650.7 (K)
Tidally Locked Blackbody T 0.3(K) 611.1 (K)
Size Class: sub-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) 1.2 (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
Discovery Paper - Title
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
Kepler-457 c
Kepler-457 c

  • Kepler-457 c 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 c orbits around the star Kepler-457 every 75.2 days with its orbital distance of 0.37 AU ( 54663062.0 km)
  • (Projected orbit of Kepler-457 c 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 c : 22590.46 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 c)



    (Zoomed position in Stellar Map of star Kepler-457 and its Exoplanet Kepler-457 c (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