Imaginary Picture of TOI-421 b

Display orbital revolution of TOI-421 b around the hoststar TOI-421
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Exoplanet Name : TOI-421 b
Alternate Name :
Radius (Rjup / Re): 0.4612 (Rjup) 5.1696 (Rearth)
Mass (Mjup / Me): 0.0511 (Mjup) 16.2371 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1182 (AU) 0.1182 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0440
Orbital Period(Observed/Estimated) 16.07 (Days Obs.) 15.91 (Days Est.)
Surface Gravity (G Earth) 0.6076
Star Radiation at Atmospheric Boundary: 1956.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 296.8 (K)
Blackbody T 0.3(K) 278.8 (K)
Blackbody T 0.7(K) 225.5 (K)
Tidally Locked Blackbody T 0.1(K) 353.0 (K)
Tidally Locked Blackbody T 0.3(K) 331.5 (K)
Size Class: sub-Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Habitable
Habitability by Kopparapu: Not habitable
Star Name : TOI-421
Alternate Name :
Star Distance(LY) : 0.0
Stellar Radius(Rsun) : 0.4 (Rsun Estimated)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3300 (K)
Spectral type : M9
UV portion[%]: 0.2
Visible portion[%]: 11.2
IR portion[%]: 88.6
Metalicity : 0.0
Absolute Magnitude: 25.0
Apparent Magnitude: 22.0
Right Ascension(RA) 81.8542
Declination (DEC) -14.2769
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-421 b
TOI-421 b

  • TOI-421 b is an exoplanet orbiting the star TOI-421. Its discovery was publicly announced on 2020.
  • The host star TOI-421 has apparent magnitude of 22.0, with absolute magnitude of 25.0.
  • It is 0.9 times more massive and 0.4 times bigger compared with our Sun. The surface temperature is 3300 with its spectral types of M9
  • In this planetary system, the extrasolar planet TOI-421 b orbits around the star TOI-421 every 16.1 days with its orbital distance of 0.12 AU ( 17682468.3 km)
  • (Projected orbit of TOI-421 b around its host star TOI-421)


  • The Star TOI-421 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.102 AU ( 15301294.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.141 AU ( 21150388.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.215 AU ( 32228511.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.317 AU ( 47425666.0 km)
  • Radiation at Planetary Boundary of TOI-421 b : 1956.64 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star TOI-421)



  • Kopparapu Recent Venus for Star TOI-421 distance : 0.116 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star TOI-421 distance : 0.147 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star TOI-421 distance : 0.142 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star TOI-421 distance : 0.156 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-421 distance : 0.288 AU
  • Kopparapu Outer Boundary for Early Mars for Star TOI-421 distance : 0.304 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star TOI-421)



  • Original Kopparapu Recent Venus for Star TOI-421 distance : 0.115 AU
  • Original Kopparapu Runaway Greenhouse for Star TOI-421 distance : 0.152 AU
  • Original Kopparapu Moist Greenhouse for Star TOI-421 distance : 0.152 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-421 distance : 0.293 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star TOI-421 distance : 0.304 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star TOI-421)



    (Position in Stellar Map of star TOI-421 and its Exoplanet TOI-421 b)



    (Zoomed position in Stellar Map of star TOI-421 and its Exoplanet TOI-421 b (zoom level 3))

    (Synthetic Spectrum of star TOI-421*)
    *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