Imaginary Picture of Kepler-1021 b

Display orbital revolution of Kepler-1021 b around the hoststar Kepler-1021
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Exoplanet Name : Kepler-1021 b
Alternate Name : "2MASS J19404917+4233348 b, K01939.01, KIC 7045496 b, KOI-1939 b, KOI-1939.01"
Status : Confirmed
Radius (Rjup / Re): 0.2080 (Rjup) 2.3315 (Rearth)
Mass (Mjup / Me): 0.0182 (Mjup) 5.7971 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.1066 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0369
Orbital Period(Observed/Estimated) 13.47 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.0665
Star Radiation at Atmospheric Boundary: 64739.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 711.9 (K)
Blackbody T 0.3(K) 668.6 (K)
Blackbody T 0.7(K) 540.9 (K)
Tidally Locked Blackbody T 0.1(K) 846.6 (K)
Tidally Locked Blackbody T 0.3(K) 795.1 (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-1021
Alternate Name : "2MASS J19404917+4233348, KIC 7045496, KOI-1939"
Star Distance(LY) : 2642.5
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 4.7 (GY)
Temperature : 5403 (K)
Spectral type : G7
UV portion[%]: 6.4
Visible portion[%]: 42.5
IR portion[%]: 51.1
Metalicity : -0.1
Absolute Magnitude: 4.3
Apparent Magnitude: 13.8
Right Ascension(RA) 295.2049
Declination (DEC) 42.5597
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-1021+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-1021%20b/
Kepler-1021 b
Kepler-1021 b

  • Kepler-1021 b is an exoplanet orbiting the star Kepler-1021, located about 2642.5 light-years (810.2 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-1021 has apparent magnitude of 13.8, with absolute magnitude of 4.3.
  • It is 0.9 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5403 with its spectral types of G7
  • In this planetary system, the extrasolar planet Kepler-1021 b orbits around the star Kepler-1021 every 13.5 days with its orbital distance of 0.11 AU ( 15946837.8 km)
  • (Projected orbit of Kepler-1021 b around its host star Kepler-1021)


  • The Star Kepler-1021 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.531 AU ( 79376146.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.733 AU ( 109718577.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.118 AU ( 167186831.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.645 AU ( 246022745.8 km)
  • Radiation at Planetary Boundary of Kepler-1021 b : 64739.64 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1021)



  • Kopparapu Recent Venus for Star Kepler-1021 distance : 0.562 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-1021 distance : 0.712 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1021 distance : 0.687 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-1021 distance : 0.754 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1021 distance : 1.271 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-1021 distance : 1.341 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1021)



  • Original Kopparapu Recent Venus for Star Kepler-1021 distance : 0.559 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1021 distance : 0.732 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1021 distance : 0.740 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1021 distance : 1.293 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1021 distance : 1.345 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1021)



    (Position in Stellar Map of star Kepler-1021 and its Exoplanet Kepler-1021 b)



    (Zoomed position in Stellar Map of star Kepler-1021 and its Exoplanet Kepler-1021 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-1021*)
    *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