Imaginary Picture of Kepler-1121 b

Display orbital revolution of Kepler-1121 b around the hoststar Kepler-1121
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Exoplanet Name : Kepler-1121 b
Alternate Name : "2MASS J19510878+4753100 b, K02149.01, KIC 10617017 b, KOI-2149 b, KOI-2149.01, WISE J195108.77+475310.1 b"
Status : Confirmed
Radius (Rjup / Re): 0.1700 (Rjup) 1.9055 (Rearth)
Mass (Mjup / Me): 0.0151 (Mjup) 4.8054 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.1187 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0360
Orbital Period(Observed/Estimated) 13.15 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.3234
Star Radiation at Atmospheric Boundary: 280067.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1026.7 (K)
Blackbody T 0.3(K) 964.2 (K)
Blackbody T 0.7(K) 780.1 (K)
Tidally Locked Blackbody T 0.1(K) 1221.0 (K)
Tidally Locked Blackbody T 0.3(K) 1146.6 (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-1121
Alternate Name : "2MASS J19510878+4753100, KIC 10617017, KOI-2149, WISE J195108.77+475310.1"
Star Distance(LY) : 1571.7
Stellar Radius(Rsun) : 1.5 (Rsun Measured)
Stellar Mass(Msun) : 1.3 (Msun Measured) 1.3 (Msun Estimated)
Star Age : 3.0 (GY)
Temperature : 6212 (K)
Spectral type : F8
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : 0.1
Absolute Magnitude: 2.7
Apparent Magnitude: 11.1
Right Ascension(RA) 297.7866
Declination (DEC) 47.8861
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-1121+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-1121%20b/
Kepler-1121 b
Kepler-1121 b

  • Kepler-1121 b is an exoplanet orbiting the star Kepler-1121, located about 1571.7 light-years (481.9 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-1121 has apparent magnitude of 11.1, with absolute magnitude of 2.7.
  • It is 1.3 times more massive and 1.5 times bigger compared with our Sun. The surface temperature is 6212 with its spectral types of F8
  • In this planetary system, the extrasolar planet Kepler-1121 b orbits around the star Kepler-1121 every 13.2 days with its orbital distance of 0.12 AU ( 17757291.7 km)
  • (Projected orbit of Kepler-1121 b around its host star Kepler-1121)


  • The Star Kepler-1121 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.229 AU ( 183839293.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.699 AU ( 254113946.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.588 AU ( 387213418.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.809 AU ( 569801507.9 km)
  • Radiation at Planetary Boundary of Kepler-1121 b : 280067.45 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1121)



  • Kopparapu Recent Venus for Star Kepler-1121 distance : 1.241 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-1121 distance : 1.571 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1121 distance : 1.517 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-1121 distance : 1.663 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1121 distance : 2.747 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-1121 distance : 2.897 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1121)



  • Original Kopparapu Recent Venus for Star Kepler-1121 distance : 1.254 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1121 distance : 1.612 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1121 distance : 1.659 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1121 distance : 2.796 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1121 distance : 2.908 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1121)



    (Position in Stellar Map of star Kepler-1121 and its Exoplanet Kepler-1121 b)



    (Zoomed position in Stellar Map of star Kepler-1121 and its Exoplanet Kepler-1121 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-1121*)
    *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