Imaginary Picture of HATS-8 b

Display orbital revolution of HATS-8 b around the hoststar HATS-8
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Exoplanet Name : HATS-8 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.8730 (Rjup) 9.7855 (Rearth)
Mass (Mjup / Me): 0.1380 (Mjup) 43.8754 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0467 (AU) 0.0467 (AU Est.)
Eccentricity : 0.3800
Orbital Period(Yrs) 0.0098
Orbital Period(Observed/Estimated) 3.58 (Days Obs.) 3.58 (Days Est.)
Surface Gravity (G Earth) 0.4582
Star Radiation at Atmospheric Boundary: 690679.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1286.7 (K)
Blackbody T 0.3(K) 1208.3 (K)
Blackbody T 0.7(K) 977.6 (K)
Tidally Locked Blackbody T 0.1(K) 1530.1 (K)
Tidally Locked Blackbody T 0.3(K) 1436.9 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HATS-8
Alternate Name :
Star Distance(LY) : 2703.8
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 5.1 (GY)
Temperature : 5679 (K)
Spectral type : G2V
UV portion[%]: 7.5
Visible portion[%]: 44.3
IR portion[%]: 48.1
Metalicity : 0.2
Absolute Magnitude: 4.4
Apparent Magnitude: 14.0
Right Ascension(RA) 294.9417
Declination (DEC) -25.7483
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "D. Bayliss, J. D. Hartman, G. _. Bakos, K. Penev, G. Zhou, R. Brahm, M. Rabus, A. Jord_n, L. Mancini, M. de Val-Borro, W. Bhatti, N. Espinoza, Z. Csubry, A. W. Howard, B. J. Fulton, L. A. Buchhave, T. Henning, B. Schmidt, S. Ciceri, R. W. Noyes, H. Isaacson, G. W. Marcy, V. Suc, J. L_z_r, I. Papp, P. S_ri"
Discovery Paper - Title HATS-8b: A Low-Density Transiting Super-Neptune
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HATS-8+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HATS-8%20b/
HATS-8 b
HATS-8 b
  • HATS-8 b is an exoplanet orbiting the star HATS-8, located about 2703.8 light-years (829.0 pc) away from Solar System. Its discovery was publicly announced on 2015.
  • The host star HATS-8 has apparent magnitude of 14.0, with absolute magnitude of 4.4.
  • It is 1.1 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5679 with its spectral types of G2V
  • In this planetary system, the extrasolar planet HATS-8 b orbits around the star HATS-8 every 3.6 days with its orbital distance of 0.05 AU ( 6981732.6 km)
    • (Projected orbit of HATS-8 b around its host star HATS-8)


  • The Star HATS-8 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.759 AU ( 113509360.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.049 AU ( 156899599.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.598 AU ( 239080267.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.352 AU ( 351817086.6 km)
  • Radiation at Planetary Boundary of HATS-8 b : 690679.13 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HATS-8)



  • Kopparapu Recent Venus for Star HATS-8 distance : 0.791 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HATS-8 distance : 1.002 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HATS-8 distance : 0.968 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HATS-8 distance : 1.061 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HATS-8 distance : 1.774 AU
  • Kopparapu Outer Boundary for Early Mars for Star HATS-8 distance : 1.871 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HATS-8)



  • Original Kopparapu Recent Venus for Star HATS-8 distance : 0.791 AU
  • Original Kopparapu Runaway Greenhouse for Star HATS-8 distance : 1.030 AU
  • Original Kopparapu Moist Greenhouse for Star HATS-8 distance : 1.046 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HATS-8 distance : 1.805 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HATS-8 distance : 1.877 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HATS-8)



    (Position in Stellar Map of star HATS-8 and its Exoplanet HATS-8 b)



    (Zoomed position in Stellar Map of star HATS-8 and its Exoplanet HATS-8 b (zoom level 3))

    (Synthetic Spectrum of star HATS-8*)
    *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