Imaginary Picture of HAT-P-28 b

Display orbital revolution of HAT-P-28 b around the hoststar HAT-P-28
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Exoplanet Name : HAT-P-28 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 1.2120 (Rjup) 13.5853 (Rearth)
Mass (Mjup / Me): 0.6260 (Mjup) 199.0292 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0434 (AU) 0.0434 (AU Est.)
Eccentricity : 0.0510
Orbital Period(Yrs) 0.0089
Orbital Period(Observed/Estimated) 3.26 (Days Obs.) 3.26 (Days Est.)
Surface Gravity (G Earth) 1.0784
Star Radiation at Atmospheric Boundary: 824460.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1344.9 (K)
Blackbody T 0.3(K) 1263.0 (K)
Blackbody T 0.7(K) 1021.9 (K)
Tidally Locked Blackbody T 0.1(K) 1599.3 (K)
Tidally Locked Blackbody T 0.3(K) 1502.0 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HAT-P-28
Alternate Name :
Star Distance(LY) : 1288.3
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 6.1 (GY)
Temperature : 5680 (K)
Spectral type : G3
UV portion[%]: 7.5
Visible portion[%]: 44.3
IR portion[%]: 48.1
Metalicity : 0.1
Absolute Magnitude: 5.0
Apparent Magnitude: 13.0
Right Ascension(RA) 13.0008
Declination (DEC) 34.7283
Hubble Space Telescope Guide Star Catalog (GSC) ID 02284-00503
Discovered by
Discovery Paper - Authors CUTRI R.M.; SKRUTSKIE M.F.; VAN DYK S.; BEICHMAN C.A.; CARPENTER J.M.; CHESTER T.; CAMBRESY L.; EVANS T.; FOWLER J.; GIZIS J.; HOWARD E.; HUCHRA J.; JARRETT T.; KOPAN E.L.; KIRKPATRICK J.D.; LIGHT R.M.; MARSH K.A.; McCALLON H.; SCHNEIDER S.; STIENING R.; SYKES M.; WEINBERG M.; WHEATON W.A.; WHEELOCK S.; ZACARIAS N.
Discovery Paper - Title 2MASS All Sky Catalog of point sources.
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HAT-P-28+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HAT-P-28%20b/
HAT-P-28 b
HAT-P-28 b

  • HAT-P-28 b is an exoplanet orbiting the star HAT-P-28, located about 1288.3 light-years (395.0 pc) away from Solar System. Its discovery was publicly announced on 2011.
  • The host star HAT-P-28 has apparent magnitude of 13.0, with absolute magnitude of 5.0.
  • It is 1.0 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5680 with its spectral types of G3
  • In this planetary system, the extrasolar planet HAT-P-28 b orbits around the star HAT-P-28 every 3.3 days with its orbital distance of 0.04 AU ( 6492547.6 km)
  • (Projected orbit of HAT-P-28 b around its host star HAT-P-28)


  • The Star HAT-P-28 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.771 AU ( 115326814.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.066 AU ( 159411796.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.624 AU ( 242908299.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.389 AU ( 357450203.9 km)
  • Radiation at Planetary Boundary of HAT-P-28 b : 824460.25 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HAT-P-28)



  • Kopparapu Recent Venus for Star HAT-P-28 distance : 0.804 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HAT-P-28 distance : 1.018 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HAT-P-28 distance : 0.983 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HAT-P-28 distance : 1.078 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-28 distance : 1.802 AU
  • Kopparapu Outer Boundary for Early Mars for Star HAT-P-28 distance : 1.901 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HAT-P-28)



  • Original Kopparapu Recent Venus for Star HAT-P-28 distance : 0.803 AU
  • Original Kopparapu Runaway Greenhouse for Star HAT-P-28 distance : 1.046 AU
  • Original Kopparapu Moist Greenhouse for Star HAT-P-28 distance : 1.063 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-28 distance : 1.834 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HAT-P-28 distance : 1.907 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HAT-P-28)



    (Position in Stellar Map of star HAT-P-28 and its Exoplanet HAT-P-28 b)



    (Zoomed position in Stellar Map of star HAT-P-28 and its Exoplanet HAT-P-28 b (zoom level 3))

    (Synthetic Spectrum of star HAT-P-28*)
    *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