Imaginary Picture of HD 181234 b

Display orbital revolution of HD 181234 b around the hoststar HD 181234
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Exoplanet Name : HD 181234 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 8.3700 (Mjup) 2661.1411 (Mearth)
Semi Major Axis / Orbital Distance Calculated 7.5200 (AU) 7.5200 (AU Est.)
Eccentricity : 0.7300
Orbital Period(Yrs) 20.4294
Orbital Period(Observed/Estimated) 7462.06 (Days Obs.) 7494.74 (Days Est.)
Surface Gravity (G Earth) 25.6995
Star Radiation at Atmospheric Boundary: 24.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 99.3 (K)
Blackbody T 0.3(K) 93.3 (K)
Blackbody T 0.7(K) 75.5 (K)
Tidally Locked Blackbody T 0.1(K) 118.1 (K)
Tidally Locked Blackbody T 0.3(K) 110.9 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 181234
Alternate Name :
Star Distance(LY) : 155.9
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 6.3 (GY)
Temperature : 5660 (K)
Spectral type : G5
UV portion[%]: 7.5
Visible portion[%]: 44.2
IR portion[%]: 48.3
Metalicity : 0.3
Absolute Magnitude: 2.6
Apparent Magnitude: 6.0
Right Ascension(RA) 290.0004
Declination (DEC) -9.3236
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+181234+&submit=SIMBAD+search
Open Exoplanet Database Link
HD 181234 b
HD 181234 b

  • HD 181234 b is an exoplanet orbiting the star HD 181234, located about 155.9 light-years (47.8 pc) away from Solar System. Its discovery was publicly announced on 2019.
  • The host star HD 181234 has apparent magnitude of 6.0, with absolute magnitude of 2.6.
  • It is 1.0 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5660 with its spectral types of G5
  • In this planetary system, the extrasolar planet HD 181234 b orbits around the star HD 181234 every 7462.1 days with its orbital distance of 7.52 AU ( 1124975987.7 km)
  • (Projected orbit of HD 181234 b around its host star HD 181234)


  • The Star HD 181234 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.729 AU ( 109013497.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.007 AU ( 150685142.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.535 AU ( 229610810.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.259 AU ( 337882366.1 km)
  • Radiation at Planetary Boundary of HD 181234 b : 24.54 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 181234)



  • Kopparapu Recent Venus for Star HD 181234 distance : 0.761 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 181234 distance : 0.963 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 181234 distance : 0.930 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 181234 distance : 1.020 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 181234 distance : 1.706 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 181234 distance : 1.800 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 181234)



  • Original Kopparapu Recent Venus for Star HD 181234 distance : 0.760 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 181234 distance : 0.990 AU
  • Original Kopparapu Moist Greenhouse for Star HD 181234 distance : 1.005 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 181234 distance : 1.736 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 181234 distance : 1.806 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 181234)



    (Position in Stellar Map of star HD 181234 and its Exoplanet HD 181234 b)



    (Zoomed position in Stellar Map of star HD 181234 and its Exoplanet HD 181234 b (zoom level 3))

    (Synthetic Spectrum of star HD 181234*)
    *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