Imaginary Picture of TOI-1231 b

Display orbital revolution of TOI-1231 b around the hoststar TOI-1231
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Exoplanet Name : TOI-1231 b
Alternate Name : NLTT 24399
Status : Confirmed
Radius (Rjup / Re): 0.3256 (Rjup) 3.6497 (Rearth)
Mass (Mjup / Me): 0.0485 (Mjup) 15.4200 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1288 (AU) 0.1288 (AU Est.)
Eccentricity : 0.0870
Orbital Period(Yrs) 0.0664
Orbital Period(Observed/Estimated) 24.25 (Days Obs.) 24.24 (Days Est.)
Surface Gravity (G Earth) 1.1577
Star Radiation at Atmospheric Boundary: 2696.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 321.6 (K)
Blackbody T 0.3(K) 302.0 (K)
Blackbody T 0.7(K) 244.4 (K)
Tidally Locked Blackbody T 0.1(K) 382.5 (K)
Tidally Locked Blackbody T 0.3(K) 359.2 (K)
Size Class: 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-1231
Alternate Name : NLTT 24399
Star Distance(LY) : 89.7
Stellar Radius(Rsun) : 0.5 (Rsun Measured)
Stellar Mass(Msun) : 0.5 (Msun Measured) 0.5 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3562 (K)
Spectral type : M3V
UV portion[%]: 0.3
Visible portion[%]: 15.9
IR portion[%]: 83.8
Metalicity : 0.1
Absolute Magnitude: 10.1
Apparent Magnitude: 12.3
Right Ascension(RA) 156.7458
Declination (DEC) -52.4678
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK https://simbad.u-strasbg.fr/simbad/sim-basic?Ident=TOI-1231&submit=SIMBAD+search
Open Exoplanet Database Link
TOI-1231 b
TOI-1231 b

  • TOI-1231 b is an exoplanet orbiting the star TOI-1231, located about 89.7 light-years (27.5 pc) away from Solar System. Its discovery was publicly announced on 2021.
  • The host star TOI-1231 has apparent magnitude of 12.3, with absolute magnitude of 10.1.
  • It is 0.5 times more massive and 0.5 times bigger compared with our Sun. The surface temperature is 3562 with its spectral types of M3V
  • In this planetary system, the extrasolar planet TOI-1231 b orbits around the star TOI-1231 every 24.2 days with its orbital distance of 0.13 AU ( 19268205.7 km)
  • (Projected orbit of TOI-1231 b around its host star TOI-1231)


  • The Star TOI-1231 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.131 AU ( 19572797.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.181 AU ( 27054720.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.276 AU ( 41225407.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.406 AU ( 60664992.5 km)
  • Radiation at Planetary Boundary of TOI-1231 b : 2696.27 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star TOI-1231)



  • Kopparapu Recent Venus for Star TOI-1231 distance : 0.148 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star TOI-1231 distance : 0.187 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star TOI-1231 distance : 0.180 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star TOI-1231 distance : 0.199 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-1231 distance : 0.363 AU
  • Kopparapu Outer Boundary for Early Mars for Star TOI-1231 distance : 0.383 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star TOI-1231)



  • Original Kopparapu Recent Venus for Star TOI-1231 distance : 0.146 AU
  • Original Kopparapu Runaway Greenhouse for Star TOI-1231 distance : 0.194 AU
  • Original Kopparapu Moist Greenhouse for Star TOI-1231 distance : 0.194 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-1231 distance : 0.368 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star TOI-1231 distance : 0.383 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star TOI-1231)



    (Position in Stellar Map of star TOI-1231 and its Exoplanet TOI-1231 b)



    (Zoomed position in Stellar Map of star TOI-1231 and its Exoplanet TOI-1231 b (zoom level 3))

    (Synthetic Spectrum of star TOI-1231*)
    *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