Imaginary Picture of TOI-1820 b

Display orbital revolution of TOI-1820 b around the hoststar TOI-1820
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Exoplanet Name : TOI-1820 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 1.1200 (Rjup) 12.5541 (Rearth)
Mass (Mjup / Me): 2.3000 (Mjup) 731.2574 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0690 (AU) 0.0690 (AU Est.)
Eccentricity : 0.0430
Orbital Period(Yrs) 0.0133
Orbital Period(Observed/Estimated) 4.86 (Days Obs.) 6.49 (Days Est.)
Surface Gravity (G Earth) 4.6398
Star Radiation at Atmospheric Boundary: 634879.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1259.8 (K)
Blackbody T 0.3(K) 1183.1 (K)
Blackbody T 0.7(K) 957.3 (K)
Tidally Locked Blackbody T 0.1(K) 1498.2 (K)
Tidally Locked Blackbody T 0.3(K) 1407.0 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : TOI-1820
Alternate Name :
Star Distance(LY) : 815.4
Stellar Radius(Rsun) : 1.5 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.9 (Msun Estimated)
Star Age : 11.0 (GY)
Temperature : 5734 (K)
Spectral type : G3
UV portion[%]: 7.7
Visible portion[%]: 44.6
IR portion[%]: 47.7
Metalicity : 0.1
Absolute Magnitude: 4.0
Apparent Magnitude: 11.0
Right Ascension(RA) 187.6875
Declination (DEC) 27.4522
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
TOI-1820 b
TOI-1820 b

  • TOI-1820 b is an exoplanet orbiting the star TOI-1820, located about 815.4 light-years (250.0 pc) away from Solar System. Its discovery was publicly announced on 2022.
  • The host star TOI-1820 has apparent magnitude of 11.0, with absolute magnitude of 4.0.
  • It is 1.0 times more massive and 1.5 times bigger compared with our Sun. The surface temperature is 5734 with its spectral types of G3
  • In this planetary system, the extrasolar planet TOI-1820 b orbits around the star TOI-1820 every 4.9 days with its orbital distance of 0.07 AU ( 10322253.1 km)
  • (Projected orbit of TOI-1820 b around its host star TOI-1820)


  • The Star TOI-1820 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.076 AU ( 160897922.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.487 AU ( 222402976.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.265 AU ( 338892918.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.334 AU ( 498695776.1 km)
  • Radiation at Planetary Boundary of TOI-1820 b : 634879.46 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star TOI-1820)



  • Kopparapu Recent Venus for Star TOI-1820 distance : 1.118 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star TOI-1820 distance : 1.415 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star TOI-1820 distance : 1.367 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star TOI-1820 distance : 1.499 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-1820 distance : 2.502 AU
  • Kopparapu Outer Boundary for Early Mars for Star TOI-1820 distance : 2.639 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star TOI-1820)



  • Original Kopparapu Recent Venus for Star TOI-1820 distance : 1.118 AU
  • Original Kopparapu Runaway Greenhouse for Star TOI-1820 distance : 1.455 AU
  • Original Kopparapu Moist Greenhouse for Star TOI-1820 distance : 1.480 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-1820 distance : 2.546 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star TOI-1820 distance : 2.648 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star TOI-1820)



    (Position in Stellar Map of star TOI-1820 and its Exoplanet TOI-1820 b)



    (Zoomed position in Stellar Map of star TOI-1820 and its Exoplanet TOI-1820 b (zoom level 3))

    (Synthetic Spectrum of star TOI-1820*)
    *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