Imaginary Picture of NGTS-8 b

Display orbital revolution of NGTS-8 b around the hoststar NGTS-8
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Exoplanet Name : NGTS-8 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 1.0900 (Rjup) 12.2178 (Rearth)
Mass (Mjup / Me): 0.9300 (Mjup) 295.6823 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0350 (AU) 0.0350 (AU Est.)
Eccentricity : 0.0100
Orbital Period(Yrs) 0.0068
Orbital Period(Observed/Estimated) 2.50 (Days Obs.) 2.54 (Days Est.)
Surface Gravity (G Earth) 1.9808
Star Radiation at Atmospheric Boundary: 725399.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1302.5 (K)
Blackbody T 0.3(K) 1223.2 (K)
Blackbody T 0.7(K) 989.7 (K)
Tidally Locked Blackbody T 0.1(K) 1549.0 (K)
Tidally Locked Blackbody T 0.3(K) 1454.6 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Spectrum
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : NGTS-8
Alternate Name :
Star Distance(LY) : 1416.4
Stellar Radius(Rsun) : 1.0 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 12.5 (GY)
Temperature : 5241 (K)
Spectral type : KOV
UV portion[%]: 5.3
Visible portion[%]: 40.7
IR portion[%]: 53.9
Metalicity : 0.2
Absolute Magnitude: 5.5
Apparent Magnitude: 13.7
Right Ascension(RA) 328.9750
Declination (DEC) -14.0683
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
NGTS-8 b
NGTS-8 b

  • NGTS-8 b is an exoplanet orbiting the star NGTS-8, located about 1416.4 light-years (434.3 pc) away from Solar System. Its discovery was publicly announced on 2019.
  • The host star NGTS-8 has apparent magnitude of 13.7, with absolute magnitude of 5.5.
  • It is 0.9 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5241 with its spectral types of KOV
  • In this planetary system, the extrasolar planet NGTS-8 b orbits around the star NGTS-8 every 2.5 days with its orbital distance of 0.04 AU ( 5235925.5 km)
  • (Projected orbit of NGTS-8 b around its host star NGTS-8)


  • The Star NGTS-8 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.583 AU ( 87239367.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.806 AU ( 120587604.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.228 AU ( 183748822.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.807 AU ( 270394442.0 km)
  • Radiation at Planetary Boundary of NGTS-8 b : 725399.93 W/m2

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



  • Kopparapu Recent Venus for Star NGTS-8 distance : 0.623 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star NGTS-8 distance : 0.789 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star NGTS-8 distance : 0.762 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star NGTS-8 distance : 0.836 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star NGTS-8 distance : 1.417 AU
  • Kopparapu Outer Boundary for Early Mars for Star NGTS-8 distance : 1.495 AU

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



  • Original Kopparapu Recent Venus for Star NGTS-8 distance : 0.618 AU
  • Original Kopparapu Runaway Greenhouse for Star NGTS-8 distance : 0.812 AU
  • Original Kopparapu Moist Greenhouse for Star NGTS-8 distance : 0.818 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star NGTS-8 distance : 1.441 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star NGTS-8 distance : 1.499 AU

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



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



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

    (Synthetic Spectrum of star NGTS-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