Imaginary Picture of Kepler-1321 d

Display orbital revolution of Kepler-1321 d around the hoststar Kepler-1321
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Exoplanet Name : Kepler-1321 d
Alternate Name : "KOI-2715 d, KOI-2715.03"
Status : Confirmed
Radius (Rjup / Re): 0.2345 (Rjup) 2.6281 (Rearth)
Mass (Mjup / Me): 0.0204 (Mjup) 6.4800 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0501 (AU) 0.0501 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0157
Orbital Period(Observed/Estimated) 5.72 (Days Obs.) 5.57 (Days Est.)
Surface Gravity (G Earth) 0.9382
Star Radiation at Atmospheric Boundary: 36343.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 616.2 (K)
Blackbody T 0.3(K) 578.7 (K)
Blackbody T 0.7(K) 468.2 (K)
Tidally Locked Blackbody T 0.1(K) 732.8 (K)
Tidally Locked Blackbody T 0.3(K) 688.2 (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-1321
Alternate Name : "2MASS J19380686+4638274, KIC 9837661, KOI-2715, WISE J193806.88+463827.6"
Star Distance(LY) : 2508.6
Stellar Radius(Rsun) : 0.5 (Rsun Measured)
Stellar Mass(Msun) : 0.5 (Msun Measured) 0.5 (Msun Estimated)
Star Age : 4.2 (GY)
Temperature : 4034 (K)
Spectral type : M0V
UV portion[%]: 0.7
Visible portion[%]: 25.1
IR portion[%]: 74.2
Metalicity : -0.5
Absolute Magnitude: 5.4
Apparent Magnitude: 14.8
Right Ascension(RA) 294.5286
Declination (DEC) 46.6410
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK
Open Exoplanet Database Link
Kepler-1321 d
Kepler-1321 d

  • Kepler-1321 d is an exoplanet orbiting the star Kepler-1321, located about 2508.6 light-years (769.1 pc) away from Solar System. Its discovery was publicly announced on 2022.
  • The host star Kepler-1321 has apparent magnitude of 14.8, with absolute magnitude of 5.4.
  • It is 0.5 times more massive and 0.5 times bigger compared with our Sun. The surface temperature is 4034 with its spectral types of M0V
  • In this planetary system, the extrasolar planet Kepler-1321 d orbits around the star Kepler-1321 every 5.7 days with its orbital distance of 0.05 AU ( 7494853.3 km)
  • (Projected orbit of Kepler-1321 d around its host star Kepler-1321)


  • The Star Kepler-1321 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.187 AU ( 27951541.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.258 AU ( 38636335.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.394 AU ( 58873225.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.579 AU ( 86634529.8 km)
  • Radiation at Planetary Boundary of Kepler-1321 d : 36343.33 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1321)



  • Kopparapu Recent Venus for Star Kepler-1321 distance : 0.209 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-1321 distance : 0.265 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1321 distance : 0.256 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-1321 distance : 0.281 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1321 distance : 0.502 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-1321 distance : 0.529 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1321)



  • Original Kopparapu Recent Venus for Star Kepler-1321 distance : 0.207 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1321 distance : 0.274 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1321 distance : 0.273 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1321 distance : 0.510 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1321 distance : 0.530 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1321)



    (Position in Stellar Map of star Kepler-1321 and its Exoplanet Kepler-1321 d)



    (Zoomed position in Stellar Map of star Kepler-1321 and its Exoplanet Kepler-1321 d (zoom level 3))

    (Synthetic Spectrum of star Kepler-1321*)
    *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