Imaginary Picture of Kepler-1257 b

Display orbital revolution of Kepler-1257 b around the hoststar Kepler-1257
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Exoplanet Name : Kepler-1257 b
Alternate Name : "2MASS J19441816+4537374 b, K02491.01, KIC 9229657 b, KOI-2491 b, KOI-2491.01, WISE J194418.15+453737.2 b"
Status : Confirmed
Radius (Rjup / Re): 0.1360 (Rjup) 1.5244 (Rearth)
Mass (Mjup / Me): 0.0142 (Mjup) 4.5162 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0364 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0073
Orbital Period(Observed/Estimated) 2.67 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.9434
Star Radiation at Atmospheric Boundary: 799660.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1334.7 (K)
Blackbody T 0.3(K) 1253.4 (K)
Blackbody T 0.7(K) 1014.1 (K)
Tidally Locked Blackbody T 0.1(K) 1587.2 (K)
Tidally Locked Blackbody T 0.3(K) 1490.5 (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-1257
Alternate Name : "2MASS J19441816+4537374, KIC 9229657, KOI-2491, WISE J194418.15+453737.2"
Star Distance(LY) : 3613.2
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 4.4 (GY)
Temperature : 5822 (K)
Spectral type : G7
UV portion[%]: 6.9
Visible portion[%]: 43.2
IR portion[%]: 49.9
Metalicity : -0.1
Absolute Magnitude: 4.1
Apparent Magnitude: 14.3
Right Ascension(RA) 296.0757
Declination (DEC) 45.6271
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Timothy D. Morton1, Stephen T. Bryson2, Jeffrey L. Coughlin2,3, Jason F. Rowe4, Ganesh Ravichandran5, Erik A. Petigura6,7, Michael R. Haas2, and Natalie M. Batalha16"
Discovery Paper - Title FALSE POSITIVE PROBABILITIES FOR ALL KEPLER OBJECTS OF INTEREST: 1284 NEWLY VALIDATED PLANETS AND 450 LIKELY FALSE POSITIVES
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-1257%20b/
Kepler-1257 b
Kepler-1257 b

  • Kepler-1257 b is an exoplanet orbiting the star Kepler-1257, located about 3613.2 light-years (1107.8 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-1257 has apparent magnitude of 14.3, with absolute magnitude of 4.1.
  • It is 0.9 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5822 with its spectral types of G7
  • In this planetary system, the extrasolar planet Kepler-1257 b orbits around the star Kepler-1257 every 2.7 days with its orbital distance of 0.04 AU ( 5437977.0 km)
  • (Projected orbit of Kepler-1257 b around its host star Kepler-1257)


  • The Star Kepler-1257 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.636 AU ( 95130637.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.879 AU ( 131495401.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.339 AU ( 200369892.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.971 AU ( 294853073.8 km)
  • Radiation at Planetary Boundary of Kepler-1257 b : 799660.23 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1257)



  • Kopparapu Recent Venus for Star Kepler-1257 distance : 0.657 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-1257 distance : 0.832 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1257 distance : 0.804 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-1257 distance : 0.881 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1257 distance : 1.468 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-1257 distance : 1.549 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1257)



  • Original Kopparapu Recent Venus for Star Kepler-1257 distance : 0.659 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1257 distance : 0.855 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1257 distance : 0.872 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1257 distance : 1.494 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1257 distance : 1.554 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1257)



    (Position in Stellar Map of star Kepler-1257 and its Exoplanet Kepler-1257 b)



    (Zoomed position in Stellar Map of star Kepler-1257 and its Exoplanet Kepler-1257 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-1257*)
    *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