Imaginary Picture of AD Leo b

Display orbital revolution of AD Leo b around the hoststar AD Leo
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Exoplanet Name : AD Leo b
Alternate Name :
Status : Controversial
Radius (Rjup / Re): 0.2383 (Rjup) 2.6716 (Rearth)
Mass (Mjup / Me): 0.0727 (Mjup) 23.1141 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0250 (AU) 0.0250 (AU Est.)
Eccentricity : 0.0300
Orbital Period(Yrs) 0.0061
Orbital Period(Observed/Estimated) 2.23 (Days Obs.) 1.39 (Days Est.)
Surface Gravity (G Earth) 3.2385
Star Radiation at Atmospheric Boundary: 48112.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 661.0 (K)
Blackbody T 0.3(K) 620.8 (K)
Blackbody T 0.7(K) 502.3 (K)
Tidally Locked Blackbody T 0.1(K) 786.1 (K)
Tidally Locked Blackbody T 0.3(K) 738.2 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : AD Leo
Alternate Name : GJ 388
Star Distance(LY) : 16.2
Stellar Radius(Rsun) : 0.4 (Rsun Estimated)
Stellar Mass(Msun) : 1.1 (Msun Measured) 0.4 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3400 (K)
Spectral type : M4V
UV portion[%]: 0.3
Visible portion[%]: 12.1
IR portion[%]: 87.6
Metalicity : 0.0
Absolute Magnitude: 11.0
Apparent Magnitude: 9.5
Right Ascension(RA) 154.9012
Declination (DEC) 19.8700
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=AD+Leo+&submit=SIMBAD+search
Open Exoplanet Database Link
AD Leo b
AD Leo b

  • AD Leo b is an exoplanet orbiting the star AD Leo, located about 16.2 light-years ( 5.0 pc) away from Solar System. Its discovery was publicly announced on 2019.
  • The host star AD Leo has apparent magnitude of 9.5, with absolute magnitude of 11.0.
  • It is 1.1 times more massive and 0.4 times bigger compared with our Sun. The surface temperature is 3400 with its spectral types of M4V
  • In this planetary system, the extrasolar planet AD Leo b orbits around the star AD Leo every 2.2 days with its orbital distance of 0.03 AU ( 3739946.8 km)
  • (Projected orbit of AD Leo b around its host star AD Leo)


  • The Star AD Leo 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.107 AU ( 16048133.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.148 AU ( 22182714.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.226 AU ( 33801547.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.332 AU ( 49740458.1 km)
  • Radiation at Planetary Boundary of AD Leo b : 48112.47 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star AD Leo)



  • Kopparapu Recent Venus for Star AD Leo distance : 0.121 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star AD Leo distance : 0.154 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star AD Leo distance : 0.148 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star AD Leo distance : 0.163 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star AD Leo distance : 0.300 AU
  • Kopparapu Outer Boundary for Early Mars for Star AD Leo distance : 0.317 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star AD Leo)



  • Original Kopparapu Recent Venus for Star AD Leo distance : 0.120 AU
  • Original Kopparapu Runaway Greenhouse for Star AD Leo distance : 0.159 AU
  • Original Kopparapu Moist Greenhouse for Star AD Leo distance : 0.159 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star AD Leo distance : 0.305 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star AD Leo distance : 0.317 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star AD Leo)



    (Position in Stellar Map of star AD Leo and its Exoplanet AD Leo b)



    (Zoomed position in Stellar Map of star AD Leo and its Exoplanet AD Leo b (zoom level 3))

    (Synthetic Spectrum of star AD Leo*)
    *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