Imaginary Picture of NGTS-4 b
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Exoplanet Name : NGTS-4 b
Alternate Name :
Radius (Rjup / Re): 0.2837 (Rjup) 3.1800 (Rearth)
Mass (Mjup / Me): 0.0648 (Mjup) 20.6024 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0190 (AU) 0.0190 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0037
Orbital Period(Observed/Estimated) 1.34 (Days Obs.) 1.10 (Days Est.)
Star Radiation at Atmospheric Boundary: 1676958.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1606.1 (K)
Blackbody T 0.3(K) 1508.3 (K)
Blackbody T 0.7(K) 1220.4 (K)
Tidally Locked Blackbody T 0.1(K) 1910.0 (K)
Tidally Locked Blackbody T 0.3(K) 1793.7 (K)
Size Class: 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 : NGTS-4
Alternate Name :
Star Distance(LY) : 921.7
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.5 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5143 (K)
Spectral type : K1
Metalicity : -0.3
Absolute Magnitude: 5.9
Apparent Magnitude: 13.1
Right Ascension(RA) 89.6000
Declination (DEC) -30.8119
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-4 b
NGTS-4 b

  • NGTS-4 b is an exoplanet orbiting the star NGTS-4, located about 921.7 light-years (282.6 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star NGTS-4 has apparent magnitude of 13.1, with absolute magnitude of 5.9.
  • It is 0.8 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5143 with its spectral types of K1
  • In this planetary system, the extrasolar planet NGTS-4 b orbits around the star NGTS-4 every 1.3 days with its orbital distance of 0.02 AU ( 2842359.5 km)
  • (Projected orbit of NGTS-4 b around its host star NGTS-4)


  • The Star NGTS-4 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.481 AU ( 72006292.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.665 AU ( 99531513.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.014 AU ( 151663999.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.492 AU ( 223180219.3 km)
  • Radiation at Planetary Boundary of NGTS-4 b : 1676958.36 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star NGTS-4)



  • Kopparapu Recent Venus for Star NGTS-4 distance : 0.517 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star NGTS-4 distance : 0.655 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star NGTS-4 distance : 0.632 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star NGTS-4 distance : 0.694 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star NGTS-4 distance : 1.180 AU
  • Kopparapu Outer Boundary for Early Mars for Star NGTS-4 distance : 1.245 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star NGTS-4)



  • Original Kopparapu Recent Venus for Star NGTS-4 distance : 0.512 AU
  • Original Kopparapu Runaway Greenhouse for Star NGTS-4 distance : 0.674 AU
  • Original Kopparapu Moist Greenhouse for Star NGTS-4 distance : 0.678 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star NGTS-4 distance : 1.200 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star NGTS-4 distance : 1.248 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star NGTS-4)



    (Position in Stellar Map of star NGTS-4 and its Exoplanet NGTS-4 b)



    (Zoomed position in Stellar Map of star NGTS-4 and its Exoplanet NGTS-4 b (zoom level 3))