Imaginary Picture of HATS-77 b

Display orbital revolution of HATS-77 b around the hoststar HATS-77
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Exoplanet Name : HATS-77 b
Alternate Name : TOI-730 b
Status : Confirmed
Radius (Rjup / Re): 1.1650 (Rjup) 13.0585 (Rearth)
Mass (Mjup / Me): 1.3740 (Mjup) 436.8468 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0361 (AU) 0.0361 (AU Est.)
Eccentricity : 0.0450
Orbital Period(Yrs) 0.0085
Orbital Period(Observed/Estimated) 3.09 (Days Obs.) 3.09 (Days Est.)
Surface Gravity (G Earth) 2.5618
Star Radiation at Atmospheric Boundary: 107038.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 807.3 (K)
Blackbody T 0.3(K) 758.1 (K)
Blackbody T 0.7(K) 613.4 (K)
Tidally Locked Blackbody T 0.1(K) 960.0 (K)
Tidally Locked Blackbody T 0.3(K) 901.6 (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-77
Alternate Name : TOI-730
Star Distance(LY) : 1350.3
Stellar Radius(Rsun) : 0.6 (Rsun Measured)
Stellar Mass(Msun) : 0.7 (Msun Measured) 0.7 (Msun Estimated)
Star Age : 12.1 (GY)
Temperature : 4071 (K)
Spectral type : K7
UV portion[%]: 0.7
Visible portion[%]: 24.9
IR portion[%]: 74.3
Metalicity : 0.3
Absolute Magnitude: 8.3
Apparent Magnitude: 16.4
Right Ascension(RA) 149.8250
Declination (DEC) -27.3928
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.cds.unistra.fr/simbad/sim-basic?Ident=HATS-77&submit=SIMBAD+search
Open Exoplanet Database Link
HATS-77 b
HATS-77 b

  • HATS-77 b is an exoplanet orbiting the star HATS-77, located about 1350.3 light-years (414.0 pc) away from Solar System. Its discovery was publicly announced on 2021.
  • The host star HATS-77 has apparent magnitude of 16.4, with absolute magnitude of 8.3.
  • It is 0.7 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 4071 with its spectral types of K7
  • In this planetary system, the extrasolar planet HATS-77 b orbits around the star HATS-77 every 3.1 days with its orbital distance of 0.04 AU ( 5395995.2 km)
  • (Projected orbit of HATS-77 b around its host star HATS-77)


  • The Star HATS-77 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.231 AU ( 34535940.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.319 AU ( 47737695.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.486 AU ( 72741683.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.716 AU ( 107042573.8 km)
  • Radiation at Planetary Boundary of HATS-77 b : 107038.22 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HATS-77)



  • Kopparapu Recent Venus for Star HATS-77 distance : 0.258 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HATS-77 distance : 0.327 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HATS-77 distance : 0.316 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HATS-77 distance : 0.347 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HATS-77 distance : 0.618 AU
  • Kopparapu Outer Boundary for Early Mars for Star HATS-77 distance : 0.652 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HATS-77)



  • Original Kopparapu Recent Venus for Star HATS-77 distance : 0.255 AU
  • Original Kopparapu Runaway Greenhouse for Star HATS-77 distance : 0.338 AU
  • Original Kopparapu Moist Greenhouse for Star HATS-77 distance : 0.337 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HATS-77 distance : 0.628 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HATS-77 distance : 0.653 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HATS-77)



    (Position in Stellar Map of star HATS-77 and its Exoplanet HATS-77 b)



    (Zoomed position in Stellar Map of star HATS-77 and its Exoplanet HATS-77 b (zoom level 3))

    (Synthetic Spectrum of star HATS-77*)
    *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