Imaginary Picture of TOI-4599 b

Display orbital revolution of TOI-4599 b around the hoststar TOI-4599
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Exoplanet Name : TOI-4599 b
Alternate Name : "HD 260655 b, GJ 239 b"
Status : Confirmed
Radius (Rjup / Re): 0.1106 (Rjup) 1.2397 (Rearth)
Mass (Mjup / Me): 0.0067 (Mjup) 2.1397 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0293 (AU) 0.0293 (AU Est.)
Eccentricity : 0.0390
Orbital Period(Yrs) 0.0076
Orbital Period(Observed/Estimated) 2.77 (Days Obs.) 2.77 (Days Est.)
Surface Gravity (G Earth) 1.3922
Star Radiation at Atmospheric Boundary: 57466.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 691.0 (K)
Blackbody T 0.3(K) 648.9 (K)
Blackbody T 0.7(K) 525.1 (K)
Tidally Locked Blackbody T 0.1(K) 821.8 (K)
Tidally Locked Blackbody T 0.3(K) 771.7 (K)
Size Class: super-Earth-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-4599
Alternate Name : "HD 260655, GJ 239"
Star Distance(LY) : 32.6
Stellar Radius(Rsun) : 0.4 (Rsun Measured)
Stellar Mass(Msun) : 0.4 (Msun Measured) 0.4 (Msun Estimated)
Star Age : 5.0 (GY)
Temperature : 3803 (K)
Spectral type : MOV
UV portion[%]: 0.4
Visible portion[%]: 19.5
IR portion[%]: 80.0
Metalicity : -0.4
Absolute Magnitude: 9.8
Apparent Magnitude: 9.8
Right Ascension(RA) 99.2958
Declination (DEC) 17.5647
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK http://simbad.cds.unistra.fr/simbad/sim-basic?Ident=HD+260655&submit=SIMBAD+search
Open Exoplanet Database Link
TOI-4599 b
TOI-4599 b

  • TOI-4599 b is an exoplanet orbiting the star TOI-4599, located about 32.6 light-years (10.0 pc) away from Solar System. Its discovery was publicly announced on 2022.
  • The host star TOI-4599 has apparent magnitude of 9.8, with absolute magnitude of 9.8.
  • It is 0.4 times more massive and 0.4 times bigger compared with our Sun. The surface temperature is 3803 with its spectral types of MOV
  • In this planetary system, the extrasolar planet TOI-4599 b orbits around the star TOI-4599 every 2.8 days with its orbital distance of 0.03 AU ( 4387705.5 km)
  • (Projected orbit of TOI-4599 b around its host star TOI-4599)


  • The Star TOI-4599 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.138 AU ( 20576679.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.190 AU ( 28442347.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.290 AU ( 43339843.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.426 AU ( 63776478.6 km)
  • Radiation at Planetary Boundary of TOI-4599 b : 57466.54 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star TOI-4599)



  • Kopparapu Recent Venus for Star TOI-4599 distance : 0.155 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star TOI-4599 distance : 0.196 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star TOI-4599 distance : 0.189 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star TOI-4599 distance : 0.208 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-4599 distance : 0.375 AU
  • Kopparapu Outer Boundary for Early Mars for Star TOI-4599 distance : 0.396 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star TOI-4599)



  • Original Kopparapu Recent Venus for Star TOI-4599 distance : 0.153 AU
  • Original Kopparapu Runaway Greenhouse for Star TOI-4599 distance : 0.203 AU
  • Original Kopparapu Moist Greenhouse for Star TOI-4599 distance : 0.202 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-4599 distance : 0.381 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star TOI-4599 distance : 0.396 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star TOI-4599)



    (Position in Stellar Map of star TOI-4599 and its Exoplanet TOI-4599 b)



    (Zoomed position in Stellar Map of star TOI-4599 and its Exoplanet TOI-4599 b (zoom level 3))

    (Synthetic Spectrum of star TOI-4599*)
    *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