Imaginary Picture of TOI-4308 b

Display orbital revolution of TOI-4308 b around the hoststar TOI-4308
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Exoplanet Name : TOI-4308 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.2159 (Rjup) 2.4200 (Rearth)
Mass (Mjup / Me): 0.0203 (Mjup) 6.4510 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0827 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0251
Orbital Period(Observed/Estimated) 9.15 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.1015
Star Radiation at Atmospheric Boundary: 84625.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 761.2 (K)
Blackbody T 0.3(K) 714.9 (K)
Blackbody T 0.7(K) 578.4 (K)
Tidally Locked Blackbody T 0.1(K) 905.3 (K)
Tidally Locked Blackbody T 0.3(K) 850.1 (K)
Size Class: sub-Neptune-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-4308
Alternate Name :
Star Distance(LY) : 355.3
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5243 (K)
Spectral type : K0
UV portion[%]: 5.4
Visible portion[%]: 40.7
IR portion[%]: 53.9
Metalicity : 0.0
Absolute Magnitude: 6.1
Apparent Magnitude: 11.2
Right Ascension(RA) 327.7542
Declination (DEC) -43.5625
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-4308 b
TOI-4308 b

  • TOI-4308 b is an exoplanet orbiting the star TOI-4308, located about 355.3 light-years (108.9 pc) away from Solar System. Its discovery was publicly announced on 2019.
  • The host star TOI-4308 has apparent magnitude of 11.2, with absolute magnitude of 6.1.
  • It is 0.9 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5243 with its spectral types of K0
  • In this planetary system, the extrasolar planet TOI-4308 b orbits around the star TOI-4308 every 9.2 days with its orbital distance of 0.08 AU ( 12367013.3 km)
  • (Projected orbit of TOI-4308 b around its host star TOI-4308)


  • The Star TOI-4308 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.470 AU ( 70379296.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.650 AU ( 97282579.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.991 AU ( 148237122.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.458 AU ( 218137419.9 km)
  • Radiation at Planetary Boundary of TOI-4308 b : 84625.18 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star TOI-4308)



  • Kopparapu Recent Venus for Star TOI-4308 distance : 0.503 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star TOI-4308 distance : 0.637 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star TOI-4308 distance : 0.615 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star TOI-4308 distance : 0.674 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-4308 distance : 1.143 AU
  • Kopparapu Outer Boundary for Early Mars for Star TOI-4308 distance : 1.206 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star TOI-4308)



  • Original Kopparapu Recent Venus for Star TOI-4308 distance : 0.499 AU
  • Original Kopparapu Runaway Greenhouse for Star TOI-4308 distance : 0.655 AU
  • Original Kopparapu Moist Greenhouse for Star TOI-4308 distance : 0.660 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-4308 distance : 1.163 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star TOI-4308 distance : 1.209 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star TOI-4308)



    (Position in Stellar Map of star TOI-4308 and its Exoplanet TOI-4308 b)



    (Zoomed position in Stellar Map of star TOI-4308 and its Exoplanet TOI-4308 b (zoom level 3))

    (Synthetic Spectrum of star TOI-4308*)
    *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