Imaginary Picture of HN Peg b

Display orbital revolution of HN Peg b around the hoststar HN Peg
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Exoplanet Name : HN Peg b
Alternate Name : HD 206860
Status : Confirmed
Radius (Rjup / Re): 1.1000 (Rjup) 12.3299 (Rearth)
Mass (Mjup / Me): 16.0000 (Mjup) 5087.0080 (Mearth)
Semi Major Axis / Orbital Distance Calculated 795.0000 (AU) 795.0000 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0000
Orbital Period(Observed/Estimated) 0.00 (Days Obs.) 8187304.02 (Days Est.)
Surface Gravity (G Earth) 33.4613
Star Radiation at Atmospheric Boundary: 0.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 10.1 (K)
Blackbody T 0.3(K) 9.5 (K)
Blackbody T 0.7(K) 7.7 (K)
Tidally Locked Blackbody T 0.1(K) 12.0 (K)
Tidally Locked Blackbody T 0.3(K) 11.3 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Imaging
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HN Peg
Alternate Name :
Star Distance(LY) : 58.3
Stellar Radius(Rsun) : 1.0 (Rsun Estimated)
Stellar Mass(Msun) : 1.0 (Msun Measured) 0.0 (Msun Estimated)
Star Age : 0.2 (GY)
Temperature : 6050 (K)
Spectral type : G0V
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : 0.0
Absolute Magnitude: 4.7
Apparent Magnitude: 6.0
Right Ascension(RA) 326.1305
Declination (DEC) 14.7719
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors 0
Discovery Paper - Title 0
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HN+Peg+&submit=SIMBAD+search
Open Exoplanet Database Link 0
HN Peg b
HN Peg b

  • HN Peg b is an exoplanet orbiting the star HN Peg, located about 58.3 light-years (17.9 pc) away from Solar System. Its discovery was publicly announced on 2007.
  • The host star HN Peg has apparent magnitude of 6.0, with absolute magnitude of 4.7.
  • It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 6050 with its spectral types of G0V
  • (Projected orbit of HN Peg b around its host star HN Peg)


  • The Star HN Peg 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.793 AU ( 118622988.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.096 AU ( 163967970.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.670 AU ( 249850900.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.458 AU ( 367666545.5 km)
  • Radiation at Planetary Boundary of HN Peg b : 0.00 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HN Peg)



  • Kopparapu Recent Venus for Star HN Peg distance : 0.808 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HN Peg distance : 1.024 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HN Peg distance : 0.989 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HN Peg distance : 1.084 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HN Peg distance : 1.796 AU
  • Kopparapu Outer Boundary for Early Mars for Star HN Peg distance : 1.894 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HN Peg)



  • Original Kopparapu Recent Venus for Star HN Peg distance : 0.814 AU
  • Original Kopparapu Runaway Greenhouse for Star HN Peg distance : 1.051 AU
  • Original Kopparapu Moist Greenhouse for Star HN Peg distance : 1.077 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HN Peg distance : 1.828 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HN Peg distance : 1.901 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HN Peg)



    (Position in Stellar Map of star HN Peg and its Exoplanet HN Peg b)



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

    (Synthetic Spectrum of star HN Peg*)
    *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