Imaginary Picture of Kepler-1521 b

Display orbital revolution of Kepler-1521 b around the hoststar Kepler-1521
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Exoplanet Name : Kepler-1521 b
Alternate Name : "2MASS J19304566+3750059 b, K03835.01, KIC 2581554 b, KOI-3835 b, KOI-3835.01, WISE J193045.67+375006.0 b"
Status : Confirmed
Radius (Rjup / Re): 0.2230 (Rjup) 2.4996 (Rearth)
Mass (Mjup / Me): 0.0195 (Mjup) 6.1849 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.2381 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.1291
Orbital Period(Observed/Estimated) 47.15 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 0.9899
Star Radiation at Atmospheric Boundary: 6617.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 402.6 (K)
Blackbody T 0.3(K) 378.0 (K)
Blackbody T 0.7(K) 305.9 (K)
Tidally Locked Blackbody T 0.1(K) 478.7 (K)
Tidally Locked Blackbody T 0.3(K) 449.6 (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-1521
Alternate Name : "2MASS J19304566+3750059, KIC 2581554, KOI-3835, WISE J193045.67+375006.0"
Star Distance(LY) : 675.0
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 4.5 (GY)
Temperature : 5013 (K)
Spectral type : K1
UV portion[%]: 3.3
Visible portion[%]: 37.2
IR portion[%]: 59.4
Metalicity : -0.1
Absolute Magnitude: 4.8
Apparent Magnitude: 11.4
Right Ascension(RA) 292.6903
Declination (DEC) 37.8350
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Timothy D. Morton, Stephen T. Bryson, Jeffrey L. Coughlin, Jason F. Rowe, Ganesh Ravichandran, Erik A. Petigura, Michael R. Haas, and Natalie M. Batalha2"
Discovery Paper - Title FALSE POSITIVE PROBABILITIES FOR ALL KEPLER OBJECTS OF INTEREST: 1284 NEWLY VALIDATED PLANETS AND 428 LIKELY FALSE POSITIVES
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-1521+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-1521%20b/
Kepler-1521 b
Kepler-1521 b

  • Kepler-1521 b is an exoplanet orbiting the star Kepler-1521, located about 675.0 light-years (206.9 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-1521 has apparent magnitude of 11.4, with absolute magnitude of 4.8.
  • It is 0.8 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 5013 with its spectral types of K1
  • In this planetary system, the extrasolar planet Kepler-1521 b orbits around the star Kepler-1521 every 47.1 days with its orbital distance of 0.24 AU ( 35618171.8 km)
  • (Projected orbit of Kepler-1521 b around its host star Kepler-1521)


  • The Star Kepler-1521 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.379 AU ( 56684296.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.524 AU ( 78352511.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.798 AU ( 119391887.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.174 AU ( 175690392.9 km)
  • Radiation at Planetary Boundary of Kepler-1521 b : 6617.92 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1521)



  • Kopparapu Recent Venus for Star Kepler-1521 distance : 0.410 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-1521 distance : 0.519 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1521 distance : 0.501 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-1521 distance : 0.550 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1521 distance : 0.940 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-1521 distance : 0.991 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1521)



  • Original Kopparapu Recent Venus for Star Kepler-1521 distance : 0.405 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1521 distance : 0.534 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1521 distance : 0.536 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1521 distance : 0.955 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1521 distance : 0.994 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1521)



    (Position in Stellar Map of star Kepler-1521 and its Exoplanet Kepler-1521 b)



    (Zoomed position in Stellar Map of star Kepler-1521 and its Exoplanet Kepler-1521 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-1521*)
    *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