Imaginary Picture of HD 51608 b

Display orbital revolution of HD 51608 b around the hoststar HD 51608
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Exoplanet Name : HD 51608 b
Alternate Name : GJ 253 b
Status : Confirmed
Radius (Rjup / Re): 0.2077 (Rjup) 2.3286 (Rearth)
Mass (Mjup / Me): 0.0400 (Mjup) 12.7175 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1080 (AU) 0.1080 (AU Est.)
Eccentricity : 0.0810
Orbital Period(Yrs) 0.0385
Orbital Period(Observed/Estimated) 14.07 (Days Obs.) 12.48 (Days Est.)
Surface Gravity (G Earth) 2.3455
Star Radiation at Atmospheric Boundary: 44488.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 648.2 (K)
Blackbody T 0.3(K) 608.7 (K)
Blackbody T 0.7(K) 492.5 (K)
Tidally Locked Blackbody T 0.1(K) 770.8 (K)
Tidally Locked Blackbody T 0.3(K) 723.9 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Spectrum
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 51608
Alternate Name :
Star Distance(LY) : 114.1
Stellar Radius(Rsun) : 0.7 (Rsun Estimated)
Stellar Mass(Msun) : 1.1 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5240 (K)
Spectral type : K0IV
UV portion[%]: 5.3
Visible portion[%]: 40.7
IR portion[%]: 54.0
Metalicity : 0.0
Absolute Magnitude: 5.5
Apparent Magnitude: 8.2
Right Ascension(RA) 103.7139
Declination (DEC) -55.2594
Hubble Space Telescope Guide Star Catalog (GSC) ID 08541-00519
Discovered by
Discovery Paper - Authors 0
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+51608+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%2051608%20b/
HD 51608 b
HD 51608 b

  • HD 51608 b is an exoplanet orbiting the star HD 51608, located about 114.1 light-years (35.0 pc) away from Solar System. Its discovery was publicly announced on 2011.
  • The host star HD 51608 has apparent magnitude of 8.2, with absolute magnitude of 5.5.
  • It is 1.1 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 5240 with its spectral types of K0IV
  • In this planetary system, the extrasolar planet HD 51608 b orbits around the star HD 51608 every 14.1 days with its orbital distance of 0.11 AU ( 16164049.9 km)
  • (Projected orbit of HD 51608 b around its host star HD 51608)


  • The Star HD 51608 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.446 AU ( 66696798.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.616 AU ( 92192405.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.939 AU ( 140480823.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.382 AU ( 206723685.3 km)
  • Radiation at Planetary Boundary of HD 51608 b : 44488.63 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 51608)



  • Kopparapu Recent Venus for Star HD 51608 distance : 0.476 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 51608 distance : 0.603 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 51608 distance : 0.583 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 51608 distance : 0.639 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 51608 distance : 1.084 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 51608 distance : 1.143 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 51608)



  • Original Kopparapu Recent Venus for Star HD 51608 distance : 0.473 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 51608 distance : 0.621 AU
  • Original Kopparapu Moist Greenhouse for Star HD 51608 distance : 0.626 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 51608 distance : 1.102 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 51608 distance : 1.146 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 51608)



    (Position in Stellar Map of star HD 51608 and its Exoplanet HD 51608 b)



    (Zoomed position in Stellar Map of star HD 51608 and its Exoplanet HD 51608 b (zoom level 3))

    (Synthetic Spectrum of star HD 51608*)
    *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