Imaginary Picture of NGTS-17 b

Display orbital revolution of NGTS-17 b around the hoststar NGTS-17
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Exoplanet Name : NGTS-17 b
Alternate Name :
Radius (Rjup / Re): 1.2400 (Rjup) 13.8992 (Rearth)
Mass (Mjup / Me): 0.7640 (Mjup) 242.9046 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0391 (AU) 0.0391 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0089
Orbital Period(Observed/Estimated) 3.24 (Days Obs.) 2.79 (Days Est.)
Surface Gravity (G Earth) 1.2574
Star Radiation at Atmospheric Boundary: 1461194.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1551.7 (K)
Blackbody T 0.3(K) 1457.2 (K)
Blackbody T 0.7(K) 1179.1 (K)
Tidally Locked Blackbody T 0.1(K) 1845.3 (K)
Tidally Locked Blackbody T 0.3(K) 1733.0 (K)
Size Class: Super-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 : NGTS-17
Alternate Name :
Star Distance(LY) : 3414.9
Stellar Radius(Rsun) : 1.3 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 9.2 (GY)
Temperature : 5650 (K)
Spectral type : G4V
UV portion[%]: 7.4
Visible portion[%]: 44.1
IR portion[%]: 48.4
Metalicity : 0.1
Absolute Magnitude: 4.2
Apparent Magnitude: 14.3
Right Ascension(RA) 72.9000
Declination (DEC) -34.2261
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-17 b
NGTS-17 b

  • NGTS-17 b is an exoplanet orbiting the star NGTS-17, located about 3414.9 light-years (1047.0 pc) away from Solar System. Its discovery was publicly announced on 2021.
  • The host star NGTS-17 has apparent magnitude of 14.3, with absolute magnitude of 4.2.
  • It is 1.0 times more massive and 1.3 times bigger compared with our Sun. The surface temperature is 5650 with its spectral types of G4V
  • In this planetary system, the extrasolar planet NGTS-17 b orbits around the star NGTS-17 every 3.2 days with its orbital distance of 0.04 AU ( 5849276.7 km)
  • (Projected orbit of NGTS-17 b around its host star NGTS-17)


  • The Star NGTS-17 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.925 AU ( 138320457.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.278 AU ( 191195019.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.947 AU ( 291338897.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.866 AU ( 428717950.8 km)
  • Radiation at Planetary Boundary of NGTS-17 b : 1461194.07 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star NGTS-17)



  • Kopparapu Recent Venus for Star NGTS-17 distance : 0.966 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star NGTS-17 distance : 1.223 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star NGTS-17 distance : 1.181 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star NGTS-17 distance : 1.295 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star NGTS-17 distance : 2.167 AU
  • Kopparapu Outer Boundary for Early Mars for Star NGTS-17 distance : 2.286 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star NGTS-17)



  • Original Kopparapu Recent Venus for Star NGTS-17 distance : 0.965 AU
  • Original Kopparapu Runaway Greenhouse for Star NGTS-17 distance : 1.257 AU
  • Original Kopparapu Moist Greenhouse for Star NGTS-17 distance : 1.276 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star NGTS-17 distance : 2.205 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star NGTS-17 distance : 2.293 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star NGTS-17)



    (Position in Stellar Map of star NGTS-17 and its Exoplanet NGTS-17 b)



    (Zoomed position in Stellar Map of star NGTS-17 and its Exoplanet NGTS-17 b (zoom level 3))

    (Synthetic Spectrum of star NGTS-17*)
    *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