Imaginary Picture of SOI-4 b

Display orbital revolution of SOI-4 b around the hoststar SOI-4
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Exoplanet Name : SOI-4 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) 0.0545 (AU Est.)
Eccentricity : 0.8500
Orbital Period(Yrs) 0.0144
Orbital Period(Observed/Estimated) 5.25 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) nan
Star Radiation at Atmospheric Boundary: 15915.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 501.3 (K)
Blackbody T 0.3(K) 470.8 (K)
Blackbody T 0.7(K) 380.9 (K)
Tidally Locked Blackbody T 0.1(K) 596.1 (K)
Tidally Locked Blackbody T 0.3(K) 559.8 (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 : SOI-4
Alternate Name :
Star Distance(LY) : 0.0
Stellar Radius(Rsun) : 0.6 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (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) 2.7958
Declination (DEC) 50.2728
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
SOI-4 b
SOI-4 b

  • SOI-4 b is an exoplanet orbiting the star SOI-4. Its discovery was publicly announced on 2023.
  • The host star SOI-4 has apparent magnitude of 22.0, with absolute magnitude of 25.0.
  • It is 0.8 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 3300 with its spectral types of M9
  • In this planetary system, the extrasolar planet SOI-4 b orbits around the star SOI-4 every 5.2 days with its orbital distance of 0.05 AU ( 8151272.0 km)
  • (Projected orbit of SOI-4 b around its host star SOI-4)


  • The Star SOI-4 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.134 AU ( 20116890.3 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.186 AU ( 27806799.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.283 AU ( 42371408.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.417 AU ( 62351384.4 km)
  • Radiation at Planetary Boundary of SOI-4 b : 15915.14 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star SOI-4)



  • Kopparapu Recent Venus for Star SOI-4 distance : 0.152 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star SOI-4 distance : 0.193 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star SOI-4 distance : 0.186 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star SOI-4 distance : 0.205 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star SOI-4 distance : 0.379 AU
  • Kopparapu Outer Boundary for Early Mars for Star SOI-4 distance : 0.400 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star SOI-4)



  • Original Kopparapu Recent Venus for Star SOI-4 distance : 0.151 AU
  • Original Kopparapu Runaway Greenhouse for Star SOI-4 distance : 0.200 AU
  • Original Kopparapu Moist Greenhouse for Star SOI-4 distance : 0.200 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star SOI-4 distance : 0.385 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star SOI-4 distance : 0.400 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star SOI-4)



    (Position in Stellar Map of star SOI-4 and its Exoplanet SOI-4 b)



    (Zoomed position in Stellar Map of star SOI-4 and its Exoplanet SOI-4 b (zoom level 3))

    (Synthetic Spectrum of star SOI-4*)
    *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