Imaginary Picture of HD 260655 b

Display orbital revolution of HD 260655 b around the hoststar HD 260655
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Exoplanet Name : HD 260655 b
Alternate Name : "TOI-4599 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 : HD 260655
Alternate Name : "TOI-4599, 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
HD 260655 b
HD 260655 b

  • HD 260655 b is an exoplanet orbiting the star HD 260655, located about 32.6 light-years (10.0 pc) away from Solar System. Its discovery was publicly announced on 2022.
  • The host star HD 260655 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 HD 260655 b orbits around the star HD 260655 every 2.8 days with its orbital distance of 0.03 AU ( 4387705.5 km)
  • (Projected orbit of HD 260655 b around its host star HD 260655)


  • The Star HD 260655 '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 HD 260655 b : 57466.54 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 260655)



  • Kopparapu Recent Venus for Star HD 260655 distance : 0.155 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 260655 distance : 0.196 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 260655 distance : 0.189 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 260655 distance : 0.208 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 260655 distance : 0.375 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 260655 distance : 0.396 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 260655)



  • Original Kopparapu Recent Venus for Star HD 260655 distance : 0.153 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 260655 distance : 0.203 AU
  • Original Kopparapu Moist Greenhouse for Star HD 260655 distance : 0.202 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 260655 distance : 0.381 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 260655 distance : 0.396 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 260655)



    (Position in Stellar Map of star HD 260655 and its Exoplanet HD 260655 b)



    (Zoomed position in Stellar Map of star HD 260655 and its Exoplanet HD 260655 b (zoom level 3))

    (Synthetic Spectrum of star HD 260655*)
    *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