Imaginary Picture of HD 161178 b

Display orbital revolution of HD 161178 b around the hoststar HD 161178
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Exoplanet Name : HD 161178 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 0.5700 (Mjup) 181.2247 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.8400 (AU) 0.8400 (AU Est.)
Eccentricity : 0.0440
Orbital Period(Yrs) 0.7647
Orbital Period(Observed/Estimated) 279.30 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.7501
Star Radiation at Atmospheric Boundary: 1937.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 296.1 (K)
Blackbody T 0.3(K) 278.1 (K)
Blackbody T 0.7(K) 225.0 (K)
Tidally Locked Blackbody T 0.1(K) 352.1 (K)
Tidally Locked Blackbody T 0.3(K) 330.7 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 161178
Alternate Name :
Star Distance(LY) : 0.0
Stellar Radius(Rsun) : 1.1 (Rsun Estimated)
Stellar Mass(Msun) : 0.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5500 (K)
Spectral type : G9 III
UV portion[%]: 6.9
Visible portion[%]: 43.2
IR portion[%]: 49.9
Metalicity : 0.0
Absolute Magnitude: 25.0
Apparent Magnitude: 22.0
Right Ascension(RA) 264.2833
Declination (DEC) 72.4558
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK https://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+161178&submit=SIMBAD+search
Open Exoplanet Database Link
HD 161178 b
HD 161178 b

  • HD 161178 b is an exoplanet orbiting the star HD 161178. Its discovery was publicly announced on 2021.
  • The host star HD 161178 has apparent magnitude of 22.0, with absolute magnitude of 25.0.
  • In this planetary system, the extrasolar planet HD 161178 b orbits around the star HD 161178 every 279.3 days with its orbital distance of 0.84 AU ( 125662211.4 km)
  • (Projected orbit of HD 161178 b around its host star HD 161178)


  • The Star HD 161178 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.723 AU ( 108196493.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.000 AU ( 149555829.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.523 AU ( 227889987.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.242 AU ( 335350100.1 km)
  • Radiation at Planetary Boundary of HD 161178 b : 1937.12 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 161178)



  • Kopparapu Recent Venus for Star HD 161178 distance : 0.762 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 161178 distance : 0.965 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 161178 distance : 0.932 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 161178 distance : 1.022 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 161178 distance : 1.718 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 161178 distance : 1.812 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 161178)



  • Original Kopparapu Recent Venus for Star HD 161178 distance : 0.759 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 161178 distance : 0.992 AU
  • Original Kopparapu Moist Greenhouse for Star HD 161178 distance : 1.004 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 161178 distance : 1.747 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 161178 distance : 1.817 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 161178)



    (Position in Stellar Map of star HD 161178 and its Exoplanet HD 161178 b)



    (Zoomed position in Stellar Map of star HD 161178 and its Exoplanet HD 161178 b (zoom level 3))

    (Synthetic Spectrum of star HD 161178*)
    *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