Imaginary Picture of 18 Del b

Display orbital revolution of 18 Del b around the hoststar 18 Del
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Exoplanet Name : 18 Del b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 10.3000 (Mjup) 3274.7614 (Mearth)
Semi Major Axis / Orbital Distance Calculated 2.6000 (AU) 2.6000 (AU Est.)
Eccentricity : 0.0800
Orbital Period(Yrs) 2.7194
Orbital Period(Observed/Estimated) 993.30 (Days Obs.) 1009.69 (Days Est.)
Surface Gravity (G Earth) 31.6255
Star Radiation at Atmospheric Boundary: 8055.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 422.8 (K)
Blackbody T 0.3(K) 397.1 (K)
Blackbody T 0.7(K) 321.3 (K)
Tidally Locked Blackbody T 0.1(K) 502.8 (K)
Tidally Locked Blackbody T 0.3(K) 472.2 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : 18 Del
Alternate Name :
Star Distance(LY) : 245.6
Stellar Radius(Rsun) : 8.5 (Rsun Measured)
Stellar Mass(Msun) : 2.3 (Msun Measured) 2.4 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4979 (K)
Spectral type : G6III
UV portion[%]: 3.1
Visible portion[%]: 36.8
IR portion[%]: 60.0
Metalicity : -0.1
Absolute Magnitude: 1.1
Apparent Magnitude: 5.5
Right Ascension(RA) 314.6083
Declination (DEC) 10.8392
Hubble Space Telescope Guide Star Catalog (GSC) ID 01107-02709
Discovered by Bunei Sato et al.
Discovery Paper - Authors "Sato,un'ei; Izumiura,ideyuki; Toyota,ri; Kambe,iji; Ikoma,asahiro; Omiya,asashi; Masuda,eiji; Takeda,oichi; Murata,aisuke; Itoh,oichi; Ando,iroyasu; Yoshida,ichitoshi; Kokubo,iichiro; Ida,higeru;"
Discovery Paper - Title "Planetary Companions around Three Intermediate-Mass G and K Giants: 18 Delphini, Aquilae, and HD 81688"
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=18+Del++&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/18%20Del%20b/
18 Del b
18 Del b

  • 18 Del b is an exoplanet orbiting the star 18 Del, located about 245.6 light-years (75.3 pc) away from Solar System. Its discovery was publicly announced on 2008.
  • The host star 18 Del has apparent magnitude of 5.5, with absolute magnitude of 1.1.
  • It is 2.3 times more massive and 8.5 times bigger compared with our Sun. The surface temperature is 4979 with its spectral types of G6III
  • In this planetary system, the extrasolar planet 18 Del b orbits around the star 18 Del every 993.3 days with its orbital distance of 2.60 AU ( 388954463.8 km)
  • (Projected orbit of 18 Del b around its host star 18 Del)


  • The Star 18 Del 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 4.565 AU ( 682906569.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 6.310 AU ( 943955344.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 9.615 AU ( 1438379047.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 14.149 AU ( 2116637779.8 km)
  • Radiation at Planetary Boundary of 18 Del b : 8054.98 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star 18 Del)



  • Kopparapu Recent Venus for Star 18 Del distance : 4.943 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star 18 Del distance : 6.259 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star 18 Del distance : 6.045 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star 18 Del distance : 6.634 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star 18 Del distance : 11.353 AU
  • Kopparapu Outer Boundary for Early Mars for Star 18 Del distance : 11.975 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star 18 Del)



  • Original Kopparapu Recent Venus for Star 18 Del distance : 4.890 AU
  • Original Kopparapu Runaway Greenhouse for Star 18 Del distance : 6.450 AU
  • Original Kopparapu Moist Greenhouse for Star 18 Del distance : 6.470 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star 18 Del distance : 11.543 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star 18 Del distance : 12.005 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star 18 Del)



    (Position in Stellar Map of star 18 Del and its Exoplanet 18 Del b)



    (Zoomed position in Stellar Map of star 18 Del and its Exoplanet 18 Del b (zoom level 3))

    (Synthetic Spectrum of star 18 Del*)
    *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