Imaginary Picture of TOI-178 b

Display orbital revolution of TOI-178 b around the hoststar TOI-178
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Exoplanet Name : TOI-178 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.1028 (Rjup) 1.1521 (Rearth)
Mass (Mjup / Me): 0.0047 (Mjup) 1.5007 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0261 (AU) 0.0261 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0052
Orbital Period(Observed/Estimated) 1.91 (Days Obs.) 1.62 (Days Est.)
Surface Gravity (G Earth) 1.1307
Star Radiation at Atmospheric Boundary: 252527.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1000.5 (K)
Blackbody T 0.3(K) 939.6 (K)
Blackbody T 0.7(K) 760.2 (K)
Tidally Locked Blackbody T 0.1(K) 1189.8 (K)
Tidally Locked Blackbody T 0.3(K) 1117.4 (K)
Size Class: Earth-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 : TOI-178
Alternate Name : TYC 6991-475-1
Star Distance(LY) : 205.5
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.6 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4111 (K)
Spectral type : K6
UV portion[%]: 0.8
Visible portion[%]: 25.5
IR portion[%]: 73.8
Metalicity : 0.0
Absolute Magnitude: 8.0
Apparent Magnitude: 12.0
Right Ascension(RA) 7.3000
Declination (DEC) -30.4536
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=TYC+6991-475-1&submit=SIMBAD+search
Open Exoplanet Database Link
TOI-178 b
TOI-178 b

  • TOI-178 b is an exoplanet orbiting the star TOI-178, located about 205.5 light-years (63.0 pc) away from Solar System. Its discovery was publicly announced on 2020.
  • The host star TOI-178 has apparent magnitude of 12.0, with absolute magnitude of 8.0.
  • It is 0.9 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4111 with its spectral types of K6
  • In this planetary system, the extrasolar planet TOI-178 b orbits around the star TOI-178 every 1.9 days with its orbital distance of 0.03 AU ( 3900016.5 km)
  • (Projected orbit of TOI-178 b around its host star TOI-178)


  • The Star TOI-178 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.256 AU ( 38339911.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.354 AU ( 52995777.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.540 AU ( 80753836.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.794 AU ( 118832807.8 km)
  • Radiation at Planetary Boundary of TOI-178 b : 252527.53 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star TOI-178)



  • Kopparapu Recent Venus for Star TOI-178 distance : 0.286 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star TOI-178 distance : 0.362 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star TOI-178 distance : 0.350 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star TOI-178 distance : 0.385 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-178 distance : 0.684 AU
  • Kopparapu Outer Boundary for Early Mars for Star TOI-178 distance : 0.722 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star TOI-178)



  • Original Kopparapu Recent Venus for Star TOI-178 distance : 0.283 AU
  • Original Kopparapu Runaway Greenhouse for Star TOI-178 distance : 0.375 AU
  • Original Kopparapu Moist Greenhouse for Star TOI-178 distance : 0.374 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-178 distance : 0.695 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star TOI-178 distance : 0.723 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star TOI-178)



    (Position in Stellar Map of star TOI-178 and its Exoplanet TOI-178 b)



    (Zoomed position in Stellar Map of star TOI-178 and its Exoplanet TOI-178 b (zoom level 3))

    (Synthetic Spectrum of star TOI-178*)
    *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