Imaginary Picture of TOI-178 g

Display orbital revolution of TOI-178 g around the hoststar TYC 6991-475-1
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Exoplanet Name : TOI-178 g
Alternate Name :
Radius (Rjup / Re): 0.2560 (Rjup) 2.8695 (Rearth)
Mass (Mjup / Me): 0.0124 (Mjup) 3.9424 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1275 (AU) 0.1275 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0567
Orbital Period(Observed/Estimated) 20.71 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 0.4788
Star Radiation at Atmospheric Boundary: 10557.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 452.4 (K)
Blackbody T 0.3(K) 424.9 (K)
Blackbody T 0.7(K) 343.8 (K)
Tidally Locked Blackbody T 0.1(K) 538.0 (K)
Tidally Locked Blackbody T 0.3(K) 505.3 (K)
Size Class: sub-Neptune-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 : TYC 6991-475-1
Alternate Name : TOI-178
Star Distance(LY) : 205.5
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.0 (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
Open Exoplanet Database Link
TOI-178 g
TOI-178 g

  • TOI-178 g is an exoplanet orbiting the star TYC 6991-475-1, located about 205.5 light-years (63.0 pc) away from Solar System. Its discovery was publicly announced on 2020.
  • The host star TYC 6991-475-1 has apparent magnitude of 12.0, with absolute magnitude of 8.0.
  • In this planetary system, the extrasolar planet TOI-178 g orbits around the star TYC 6991-475-1 every 20.7 days with its orbital distance of 0.13 AU ( 19073728.5 km)
  • (Projected orbit of TOI-178 g around its host star TYC 6991-475-1)


  • The Star TYC 6991-475-1 '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 g : 10557.73 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star TYC 6991-475-1)



  • Kopparapu Recent Venus for Star TYC 6991-475-1 distance : 0.286 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star TYC 6991-475-1 distance : 0.362 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star TYC 6991-475-1 distance : 0.350 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star TYC 6991-475-1 distance : 0.385 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star TYC 6991-475-1 distance : 0.684 AU
  • Kopparapu Outer Boundary for Early Mars for Star TYC 6991-475-1 distance : 0.722 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star TYC 6991-475-1)



  • Original Kopparapu Recent Venus for Star TYC 6991-475-1 distance : 0.283 AU
  • Original Kopparapu Runaway Greenhouse for Star TYC 6991-475-1 distance : 0.375 AU
  • Original Kopparapu Moist Greenhouse for Star TYC 6991-475-1 distance : 0.374 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star TYC 6991-475-1 distance : 0.695 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star TYC 6991-475-1 distance : 0.723 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star TYC 6991-475-1)



    (Position in Stellar Map of star TYC 6991-475-1 and its Exoplanet TOI-178 g)



    (Zoomed position in Stellar Map of star TYC 6991-475-1 and its Exoplanet TOI-178 g (zoom level 3))

    (Synthetic Spectrum of star TYC 6991-475-1*)
    *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