Imaginary Picture of TOI-251 b

Display orbital revolution of TOI-251 b around the hoststar TOI-251
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Exoplanet Name : TOI-251 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.2444 (Rjup) 2.7395 (Rearth)
Mass (Mjup / Me): 1.0000 (Mjup) 317.9380 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0574 (AU) 0.0574 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0135
Orbital Period(Observed/Estimated) 4.94 (Days Obs.) 4.94 (Days Est.)
Surface Gravity (G Earth) 42.3649
Star Radiation at Atmospheric Boundary: 344043.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1080.9 (K)
Blackbody T 0.3(K) 1015.1 (K)
Blackbody T 0.7(K) 821.3 (K)
Tidally Locked Blackbody T 0.1(K) 1285.4 (K)
Tidally Locked Blackbody T 0.3(K) 1207.2 (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-251
Alternate Name :
Star Distance(LY) : 324.6
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.2 (GY)
Temperature : 5875 (K)
Spectral type : G1
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : -0.1
Absolute Magnitude: 4.9
Apparent Magnitude: 9.9
Right Ascension(RA) 353.0625
Declination (DEC) -37.2558
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-251 b
TOI-251 b

  • TOI-251 b is an exoplanet orbiting the star TOI-251, located about 324.6 light-years (99.5 pc) away from Solar System. Its discovery was publicly announced on 2020.
  • The host star TOI-251 has apparent magnitude of 9.9, with absolute magnitude of 4.9.
  • It is 1.0 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5875 with its spectral types of G1
  • In this planetary system, the extrasolar planet TOI-251 b orbits around the star TOI-251 every 4.9 days with its orbital distance of 0.06 AU ( 8588413.8 km)
  • (Projected orbit of TOI-251 b around its host star TOI-251)


  • The Star TOI-251 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.659 AU ( 98548442.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.911 AU ( 136219700.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.388 AU ( 207568678.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.042 AU ( 305446403.3 km)
  • Radiation at Planetary Boundary of TOI-251 b : 344043.23 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star TOI-251)



  • Kopparapu Recent Venus for Star TOI-251 distance : 0.679 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star TOI-251 distance : 0.860 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star TOI-251 distance : 0.830 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star TOI-251 distance : 0.910 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-251 distance : 1.514 AU
  • Kopparapu Outer Boundary for Early Mars for Star TOI-251 distance : 1.597 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star TOI-251)



  • Original Kopparapu Recent Venus for Star TOI-251 distance : 0.681 AU
  • Original Kopparapu Runaway Greenhouse for Star TOI-251 distance : 0.883 AU
  • Original Kopparapu Moist Greenhouse for Star TOI-251 distance : 0.901 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-251 distance : 1.541 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star TOI-251 distance : 1.602 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star TOI-251)



    (Position in Stellar Map of star TOI-251 and its Exoplanet TOI-251 b)



    (Zoomed position in Stellar Map of star TOI-251 and its Exoplanet TOI-251 b (zoom level 3))

    (Synthetic Spectrum of star TOI-251*)
    *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