Imaginary Picture of NGTS-15 b

Display orbital revolution of NGTS-15 b around the hoststar NGTS-15
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Exoplanet Name : NGTS-15 b
Alternate Name :
Radius (Rjup / Re): 1.1000 (Rjup) 12.3299 (Rearth)
Mass (Mjup / Me): 0.7510 (Mjup) 238.7714 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0441 (AU) 0.0441 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0090
Orbital Period(Observed/Estimated) 3.28 (Days Obs.) 3.39 (Days Est.)
Surface Gravity (G Earth) 1.5706
Star Radiation at Atmospheric Boundary: 564386.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1223.3 (K)
Blackbody T 0.3(K) 1148.8 (K)
Blackbody T 0.7(K) 929.5 (K)
Tidally Locked Blackbody T 0.1(K) 1454.8 (K)
Tidally Locked Blackbody T 0.3(K) 1366.2 (K)
Size Class: 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-15
Alternate Name :
Star Distance(LY) : 2579.9
Stellar Radius(Rsun) : 1.0 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 3.3 (GY)
Temperature : 5600 (K)
Spectral type : G6V
UV portion[%]: 7.3
Visible portion[%]: 43.9
IR portion[%]: 48.8
Metalicity : 0.1
Absolute Magnitude: 5.1
Apparent Magnitude: 14.6
Right Ascension(RA) 73.3542
Declination (DEC) -32.8003
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-15 b
NGTS-15 b

  • NGTS-15 b is an exoplanet orbiting the star NGTS-15, located about 2579.9 light-years (791.0 pc) away from Solar System. Its discovery was publicly announced on 2021.
  • The host star NGTS-15 has apparent magnitude of 14.6, with absolute magnitude of 5.1.
  • It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5600 with its spectral types of G6V
  • In this planetary system, the extrasolar planet NGTS-15 b orbits around the star NGTS-15 every 3.3 days with its orbital distance of 0.04 AU ( 6597266.1 km)
  • (Projected orbit of NGTS-15 b around its host star NGTS-15)


  • The Star NGTS-15 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.648 AU ( 96957752.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.896 AU ( 134020952.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.365 AU ( 204218272.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.009 AU ( 300516134.6 km)
  • Radiation at Planetary Boundary of NGTS-15 b : 564386.33 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star NGTS-15)



  • Kopparapu Recent Venus for Star NGTS-15 distance : 0.679 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star NGTS-15 distance : 0.860 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star NGTS-15 distance : 0.830 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star NGTS-15 distance : 0.910 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star NGTS-15 distance : 1.526 AU
  • Kopparapu Outer Boundary for Early Mars for Star NGTS-15 distance : 1.609 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star NGTS-15)



  • Original Kopparapu Recent Venus for Star NGTS-15 distance : 0.677 AU
  • Original Kopparapu Runaway Greenhouse for Star NGTS-15 distance : 0.884 AU
  • Original Kopparapu Moist Greenhouse for Star NGTS-15 distance : 0.896 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star NGTS-15 distance : 1.552 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star NGTS-15 distance : 1.614 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star NGTS-15)



    (Position in Stellar Map of star NGTS-15 and its Exoplanet NGTS-15 b)



    (Zoomed position in Stellar Map of star NGTS-15 and its Exoplanet NGTS-15 b (zoom level 3))

    (Synthetic Spectrum of star NGTS-15*)
    *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