Imaginary Picture of HD 28254 A b

Display orbital revolution of HD 28254 A b around the hoststar HD 28254 A
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Exoplanet Name : HD 28254 A b
Alternate Name : HD 28254 b
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 1.1600 (Mjup) 368.8081 (Mearth)
Semi Major Axis / Orbital Distance Calculated 2.1500 (AU) 2.1500 (AU Est.)
Eccentricity : 0.8100
Orbital Period(Yrs) 3.0554
Orbital Period(Observed/Estimated) 1116.00 (Days Obs.) 1118.39 (Days Est.)
Surface Gravity (G Earth) 3.5617
Star Radiation at Atmospheric Boundary: 598.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 220.7 (K)
Blackbody T 0.3(K) 207.3 (K)
Blackbody T 0.7(K) 167.7 (K)
Tidally Locked Blackbody T 0.1(K) 262.5 (K)
Tidally Locked Blackbody T 0.3(K) 246.5 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 28254 A
Alternate Name : HD 28254
Star Distance(LY) : 178.3
Stellar Radius(Rsun) : 1.5 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5664 (K)
Spectral type : G1IV/V
UV portion[%]: 7.5
Visible portion[%]: 44.2
IR portion[%]: 48.3
Metalicity : 0.4
Absolute Magnitude: 4.0
Apparent Magnitude: 7.7
Right Ascension(RA) 66.2113
Declination (DEC) -50.6222
Hubble Space Telescope Guide Star Catalog (GSC) ID 8075-01657
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+28254+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%2028254%20b/
HD 28254 A b
HD 28254 A b

  • HD 28254 A b is an exoplanet orbiting the star HD 28254 A, located about 178.3 light-years (54.7 pc) away from Solar System. Its discovery was publicly announced on 2009.
  • The host star HD 28254 A has apparent magnitude of 7.7, with absolute magnitude of 4.0.
  • It is 1.1 times more massive and 1.5 times bigger compared with our Sun. The surface temperature is 5664 with its spectral types of G1IV/V
  • In this planetary system, the extrasolar planet HD 28254 A b orbits around the star HD 28254 A every 1116.0 days with its orbital distance of 2.15 AU ( 321635422.0 km)
  • (Projected orbit of HD 28254 A b around its host star HD 28254 A)


  • The Star HD 28254 A 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.029 AU ( 153874380.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.422 AU ( 212694605.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.166 AU ( 324099510.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.188 AU ( 476926627.1 km)
  • Radiation at Planetary Boundary of HD 28254 A b : 598.06 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 28254 A)



  • Kopparapu Recent Venus for Star HD 28254 A distance : 1.073 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 28254 A distance : 1.359 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 28254 A distance : 1.313 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 28254 A distance : 1.439 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 28254 A distance : 2.408 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 28254 A distance : 2.540 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 28254 A)



  • Original Kopparapu Recent Venus for Star HD 28254 A distance : 1.072 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 28254 A distance : 1.397 AU
  • Original Kopparapu Moist Greenhouse for Star HD 28254 A distance : 1.419 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 28254 A distance : 2.450 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 28254 A distance : 2.548 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 28254 A)



    (Position in Stellar Map of star HD 28254 A and its Exoplanet HD 28254 A b)



    (Zoomed position in Stellar Map of star HD 28254 A and its Exoplanet HD 28254 A b (zoom level 3))

    (Synthetic Spectrum of star HD 28254 A*)
    *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