Imaginary Picture of TOI-203 b

Display orbital revolution of TOI-203 b around the hoststar TOI-203
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Exoplanet Name : TOI-203 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.0000 (Rjup) 0.0000 (Rearth)
Mass (Mjup / Me): 0.0000 (Mjup) 0.0000 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.2824 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.1424
Orbital Period(Observed/Estimated) 52.00 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) nan
Star Radiation at Atmospheric Boundary: 87.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 136.5 (K)
Blackbody T 0.3(K) 128.2 (K)
Blackbody T 0.7(K) 103.7 (K)
Tidally Locked Blackbody T 0.1(K) 162.3 (K)
Tidally Locked Blackbody T 0.3(K) 152.4 (K)
Size Class: Asteroid-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : TOI-203
Alternate Name :
Star Distance(LY) : 80.9
Stellar Radius(Rsun) : 0.2 (Rsun Estimated)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3209 (K)
Spectral type : M6
UV portion[%]: 0.3
Visible portion[%]: 7.6
IR portion[%]: 92.0
Metalicity : 0.0
Absolute Magnitude: 13.0
Apparent Magnitude: 15.0
Right Ascension(RA) 43.0167
Declination (DEC) -67.6875
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-203&submit=SIMBAD+search
Open Exoplanet Database Link
TOI-203 b
TOI-203 b

  • TOI-203 b is an exoplanet orbiting the star TOI-203, located about 80.9 light-years (24.8 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star TOI-203 has apparent magnitude of 15.0, with absolute magnitude of 13.0.
  • It is 1.1 times more massive and 0.2 times bigger compared with our Sun. The surface temperature is 3209 with its spectral types of M6
  • In this planetary system, the extrasolar planet TOI-203 b orbits around the star TOI-203 every 52.0 days with its orbital distance of 0.28 AU ( 42244694.9 km)
  • (Projected orbit of TOI-203 b around its host star TOI-203)


  • The Star TOI-203 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.052 AU ( 7726775.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.071 AU ( 10680422.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.109 AU ( 16274600.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.160 AU ( 23948787.4 km)
  • Radiation at Planetary Boundary of TOI-203 b : 87.42 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star TOI-203)



  • Kopparapu Recent Venus for Star TOI-203 distance : 0.059 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star TOI-203 distance : 0.074 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star TOI-203 distance : 0.072 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star TOI-203 distance : 0.079 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-203 distance : 0.146 AU
  • Kopparapu Outer Boundary for Early Mars for Star TOI-203 distance : 0.154 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star TOI-203)



  • Original Kopparapu Recent Venus for Star TOI-203 distance : 0.058 AU
  • Original Kopparapu Runaway Greenhouse for Star TOI-203 distance : 0.077 AU
  • Original Kopparapu Moist Greenhouse for Star TOI-203 distance : 0.077 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-203 distance : 0.149 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star TOI-203 distance : 0.154 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star TOI-203)



    (Position in Stellar Map of star TOI-203 and its Exoplanet TOI-203 b)



    (Zoomed position in Stellar Map of star TOI-203 and its Exoplanet TOI-203 b (zoom level 3))

    (Synthetic Spectrum of star TOI-203*)
    *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