Imaginary Picture of alf Ari b
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Exoplanet Name : alf Ari b
Alternate Name :
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 1.8000 (Mjup) 572.2884 (Mearth)
Semi Major Axis / Orbital Distance Calculated 1.2000 (AU) 1.2000 (AU Est.)
Eccentricity : 0.2500
Orbital Period(Yrs) 1.0425
Orbital Period(Observed/Estimated) 380.80 (Days Obs.) 392.03 (Days Est.)
Star Radiation at Atmospheric Boundary: 70707.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 727.8 (K)
Blackbody T 0.3(K) 683.5 (K)
Blackbody T 0.7(K) 553.0 (K)
Tidally Locked Blackbody T 0.1(K) 865.5 (K)
Tidally Locked Blackbody T 0.3(K) 812.8 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : alf Ari
Alternate Name :
Star Distance(LY) : 65.8
Stellar Radius(Rsun) : 13.9 (Rsun Measured)
Stellar Mass(Msun) : 1.5 (Msun Measured) 1.6 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4553 (K)
Spectral type : K2III
Metalicity : -0.1
Absolute Magnitude: 0.5
Apparent Magnitude: 2.0
Right Ascension(RA) 31.7934
Declination (DEC) 23.4622
Hubble Space Telescope Guide Star Catalog (GSC) ID 01758-02416
Discovered by
Discovery Paper - Authors "Lee,.-C.; Mkrtichian,..; Han,.; Kim,.-M.; Park,.-G."
Discovery Paper - Title A likely exoplanet orbiting the oscillating K-giant Arietis
Discovery Paper - Journal "A&A 529, A134 (2011) https://doi.org/10.1051/0004-6361/201016293"
Discovery Paper - URL http://www.aanda.org/articles/aa/full_html/2011/05/aa16293-10/aa16293-10.html
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=alf+Ari+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/alf%20Ari%20b/
alf Ari b
alf Ari b

  • alf Ari b is an exoplanet orbiting the star alf Ari, located about 65.8 light-years (20.2 pc) away from Solar System. Its discovery was publicly announced on 2011.
  • The host star alf Ari has apparent magnitude of 2.0, with absolute magnitude of 0.5.
  • It is 1.5 times more massive and 13.9 times bigger compared with our Sun. The surface temperature is 4553 with its spectral types of K2III
  • In this planetary system, the extrasolar planet alf Ari b orbits around the star alf Ari every 380.8 days with its orbital distance of 1.20 AU ( 179517444.8 km)
  • (Projected orbit of alf Ari b around its host star alf Ari)


  • The Star alf Ari 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 6.242 AU ( 933830841.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 8.628 AU ( 1290798262.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 13.148 AU ( 1966890899.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 19.348 AU ( 2894366121.8 km)
  • Radiation at Planetary Boundary of alf Ari b : 70707.02 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star alf Ari)



  • Kopparapu Recent Venus for Star alf Ari distance : 6.882 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star alf Ari distance : 8.712 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star alf Ari distance : 8.414 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star alf Ari distance : 9.240 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star alf Ari distance : 16.097 AU
  • Kopparapu Outer Boundary for Early Mars for Star alf Ari distance : 16.980 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star alf Ari)



  • Original Kopparapu Recent Venus for Star alf Ari distance : 6.791 AU
  • Original Kopparapu Runaway Greenhouse for Star alf Ari distance : 8.992 AU
  • Original Kopparapu Moist Greenhouse for Star alf Ari distance : 8.985 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star alf Ari distance : 16.360 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star alf Ari distance : 17.014 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star alf Ari)



    (Position in Stellar Map of star alf Ari and its Exoplanet alf Ari b)



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