Imaginary Picture of Kepler-1873 b

Display orbital revolution of Kepler-1873 b around the hoststar Kepler-1873
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Exoplanet Name : Kepler-1873 b
Alternate Name : "KOI-2735 b, KOI-2735.01"
Status : Confirmed
Radius (Rjup / Re): 0.1450 (Rjup) 1.6257 (Rearth)
Mass (Mjup / Me): 0.0130 (Mjup) 4.1456 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0128 (AU) 0.0128 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0015
Orbital Period(Observed/Estimated) 0.56 (Days Obs.) 0.58 (Days Est.)
Surface Gravity (G Earth) 1.5685
Star Radiation at Atmospheric Boundary: 3638469.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1949.3 (K)
Blackbody T 0.3(K) 1830.6 (K)
Blackbody T 0.7(K) 1481.1 (K)
Tidally Locked Blackbody T 0.1(K) 2318.1 (K)
Tidally Locked Blackbody T 0.3(K) 2176.9 (K)
Size Class: super-Earth-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-1873
Alternate Name : "KIC 9472074, KOI-2735"
Star Distance(LY) : 2677.6
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 1.0 (GY)
Temperature : 5154 (K)
Spectral type : K1V
UV portion[%]: 4.4
Visible portion[%]: 39.5
IR portion[%]: 56.1
Metalicity : 0.2
Absolute Magnitude: 6.3
Apparent Magnitude: 15.9
Right Ascension(RA) 294.5966
Declination (DEC) 46.0483
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-1873 b
Kepler-1873 b

  • Kepler-1873 b is an exoplanet orbiting the star Kepler-1873, located about 2677.6 light-years (821.0 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star Kepler-1873 has apparent magnitude of 15.9, with absolute magnitude of 6.3.
  • It is 0.8 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5154 with its spectral types of K1V
  • In this planetary system, the extrasolar planet Kepler-1873 b orbits around the star Kepler-1873 every 0.6 days with its orbital distance of 0.01 AU ( 1914852.7 km)
  • (Projected orbit of Kepler-1873 b around its host star Kepler-1873)


  • The Star Kepler-1873 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.478 AU ( 71453751.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.660 AU ( 98767757.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.006 AU ( 150500204.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.480 AU ( 221467644.3 km)
  • Radiation at Planetary Boundary of Kepler-1873 b : 3638469.28 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1873)



  • Kopparapu Recent Venus for Star Kepler-1873 distance : 0.513 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-1873 distance : 0.649 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1873 distance : 0.627 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-1873 distance : 0.688 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1873 distance : 1.170 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-1873 distance : 1.234 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1873)



  • Original Kopparapu Recent Venus for Star Kepler-1873 distance : 0.508 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1873 distance : 0.669 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1873 distance : 0.672 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1873 distance : 1.190 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1873 distance : 1.237 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1873)



    (Position in Stellar Map of star Kepler-1873 and its Exoplanet Kepler-1873 b)



    (Zoomed position in Stellar Map of star Kepler-1873 and its Exoplanet Kepler-1873 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-1873*)
    *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