Imaginary Picture of TOI-4138 b

Display orbital revolution of TOI-4138 b around the hoststar TOI-4138
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Exoplanet Name : TOI-4138 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 1.4900 (Rjup) 16.7014 (Rearth)
Mass (Mjup / Me): 0.6700 (Mjup) 213.0185 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0510 (AU) 0.0510 (AU Est.)
Eccentricity : 0.0300
Orbital Period(Yrs) 0.0100
Orbital Period(Observed/Estimated) 3.66 (Days Obs.) 3.66 (Days Est.)
Surface Gravity (G Earth) 0.7637
Star Radiation at Atmospheric Boundary: 185209.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 925.9 (K)
Blackbody T 0.3(K) 869.5 (K)
Blackbody T 0.7(K) 703.5 (K)
Tidally Locked Blackbody T 0.1(K) 1101.1 (K)
Tidally Locked Blackbody T 0.3(K) 1034.0 (K)
Size Class: Super-Jupiter-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-4138
Alternate Name :
Star Distance(LY) : 1653.6
Stellar Radius(Rsun) : 1.8 (Rsun Measured)
Stellar Mass(Msun) : 1.3 (Msun Measured) 1.3 (Msun Estimated)
Star Age : 9.5 (GY)
Temperature : 3300 (K)
Spectral type : M9
UV portion[%]: 0.2
Visible portion[%]: 11.2
IR portion[%]: 88.6
Metalicity : 0.0
Absolute Magnitude: 3.3
Apparent Magnitude: 11.8
Right Ascension(RA) 152.5333
Declination (DEC) 72.7103
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-4138&submit=SIMBAD+search
Open Exoplanet Database Link
TOI-4138 b
TOI-4138 b

  • TOI-4138 b is an exoplanet orbiting the star TOI-4138, located about 1653.6 light-years (507.0 pc) away from Solar System. Its discovery was publicly announced on 2021.
  • The host star TOI-4138 has apparent magnitude of 11.8, with absolute magnitude of 3.3.
  • It is 1.3 times more massive and 1.8 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-4138 b orbits around the star TOI-4138 every 3.7 days with its orbital distance of 0.05 AU ( 7629491.4 km)
  • (Projected orbit of TOI-4138 b around its host star TOI-4138)


  • The Star TOI-4138 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.429 AU ( 64232877.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.594 AU ( 88786623.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.904 AU ( 135291165.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.331 AU ( 199086876.5 km)
  • Radiation at Planetary Boundary of TOI-4138 b : 185209.39 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star TOI-4138)



  • Kopparapu Recent Venus for Star TOI-4138 distance : 0.486 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star TOI-4138 distance : 0.615 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star TOI-4138 distance : 0.594 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star TOI-4138 distance : 0.654 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-4138 distance : 1.209 AU
  • Kopparapu Outer Boundary for Early Mars for Star TOI-4138 distance : 1.276 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star TOI-4138)



  • Original Kopparapu Recent Venus for Star TOI-4138 distance : 0.483 AU
  • Original Kopparapu Runaway Greenhouse for Star TOI-4138 distance : 0.637 AU
  • Original Kopparapu Moist Greenhouse for Star TOI-4138 distance : 0.639 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-4138 distance : 1.228 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star TOI-4138 distance : 1.277 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star TOI-4138)



    (Position in Stellar Map of star TOI-4138 and its Exoplanet TOI-4138 b)



    (Zoomed position in Stellar Map of star TOI-4138 and its Exoplanet TOI-4138 b (zoom level 3))

    (Synthetic Spectrum of star TOI-4138*)
    *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