Imaginary Picture of TRAPPIST-1 d
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Exoplanet Name : TRAPPIST-1 d
Alternate Name :
Radius (Rjup / Re): 0.0689 (Rjup) 0.7723 (Rearth)
Mass (Mjup / Me): 0.0013 (Mjup) 0.4133 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0214 (AU) 0.0214 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0111
Orbital Period(Observed/Estimated) 4.05 (Days Obs.) 4.05 (Days Est.)
Star Radiation at Atmospheric Boundary: 1568.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 280.9 (K)
Blackbody T 0.3(K) 263.8 (K)
Blackbody T 0.7(K) 213.4 (K)
Tidally Locked Blackbody T 0.1(K) 334.0 (K)
Tidally Locked Blackbody T 0.3(K) 313.7 (K)
Size Class: Earth-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : TTV
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Habitable
Habitability by Kopparapu: Habitable
Star Name : TRAPPIST-1
Alternate Name : 2MASS J23062928-0502285
Star Distance(LY) : 39.5
Stellar Radius(Rsun) : 0.1 (Rsun Measured)
Stellar Mass(Msun) : 0.1 (Msun Measured) 0.1 (Msun Estimated)
Star Age : 7.6 (GY)
Temperature : 2560 (K)
Spectral type : M8
Metalicity : 0.0
Absolute Magnitude: 18.4
Apparent Magnitude: 18.8
Right Ascension(RA) 346.6223
Declination (DEC) -5.0414
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Micha_l Gillon, Emmanu_l Jehin1, Susan M. Lederer, Laetitia Delrez, Val_rie Van Grootel, Adam J. Burgasser, Amaury H. M. J. Triaud, Cyrielle Julien de Wit, Artem Burdanov, Opitom, Brice-Olivier Demory, "
Discovery Paper - Title Temperate Earth-sized planets transiting a nearby ultracool dwarf star
Discovery Paper - Journal http://www.eso.org/public/archives/releases/sciencepapers/eso1615/eso1615a.pdf
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=TRAPPIST-1&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/TRAPPIST-1%20b/
TRAPPIST-1 d
TRAPPIST-1 d

  • TRAPPIST-1 d is an exoplanet orbiting the star TRAPPIST-1, located about 39.5 light-years (12.1 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star TRAPPIST-1 has apparent magnitude of 18.8, with absolute magnitude of 18.4.
  • It is 0.1 times more massive and 0.1 times bigger compared with our Sun. The surface temperature is 2560 with its spectral types of M8
  • In this planetary system, the extrasolar planet TRAPPIST-1 d orbits around the star TRAPPIST-1 every 4.0 days with its orbital distance of 0.02 AU ( 3207378.3 km)
  • (Projected orbit of TRAPPIST-1 d around its host star TRAPPIST-1)


  • The Star TRAPPIST-1 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.017 AU ( 2484985.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.023 AU ( 3434899.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.035 AU ( 5234027.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.051 AU ( 7702100.1 km)
  • Radiation at Planetary Boundary of TRAPPIST-1 d : 1568.51 W/m2

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



  • Kopparapu Recent Venus for Star TRAPPIST-1 distance : 0.019 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star TRAPPIST-1 distance : 0.024 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star TRAPPIST-1 distance : 0.023 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star TRAPPIST-1 distance : 0.026 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star TRAPPIST-1 distance : 0.049 AU
  • Kopparapu Outer Boundary for Early Mars for Star TRAPPIST-1 distance : 0.051 AU

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



  • Original Kopparapu Recent Venus for Star TRAPPIST-1 distance : 0.019 AU
  • Original Kopparapu Runaway Greenhouse for Star TRAPPIST-1 distance : 0.025 AU
  • Original Kopparapu Moist Greenhouse for Star TRAPPIST-1 distance : 0.025 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star TRAPPIST-1 distance : 0.050 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star TRAPPIST-1 distance : 0.052 AU

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



    (Position in Stellar Map of star TRAPPIST-1 and its Exoplanet TRAPPIST-1 d)



    (Zoomed position in Stellar Map of star TRAPPIST-1 and its Exoplanet TRAPPIST-1 d (zoom level 3))