Imaginary Picture of HD 2638 b

Display orbital revolution of HD 2638 b around the hoststar HD 2638
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Exoplanet Name : HD 2638 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 1.0400 (Rjup) 11.6574 (Rearth)
Mass (Mjup / Me): 0.4800 (Mjup) 152.6102 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0440 (AU) 0.0440 (AU Est.)
Eccentricity : 0.0407
Orbital Period(Yrs) 0.0094
Orbital Period(Observed/Estimated) 3.44 (Days Obs.) 3.50 (Days Est.)
Surface Gravity (G Earth) 1.1230
Star Radiation at Atmospheric Boundary: 364401.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1096.6 (K)
Blackbody T 0.3(K) 1029.8 (K)
Blackbody T 0.7(K) 833.2 (K)
Tidally Locked Blackbody T 0.1(K) 1304.1 (K)
Tidally Locked Blackbody T 0.3(K) 1224.6 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection : Theoretical
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 2638
Alternate Name :
Star Distance(LY) : 175.2
Stellar Radius(Rsun) : 0.9 (Rsun Estimated)
Stellar Mass(Msun) : 0.9 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 3.0 (GY)
Temperature : 5192 (K)
Spectral type : G5
UV portion[%]: 4.9
Visible portion[%]: 40.0
IR portion[%]: 55.0
Metalicity : 0.2
Absolute Magnitude: 5.8
Apparent Magnitude: 9.4
Right Ascension(RA) 7.4995
Declination (DEC) -5.7639
Hubble Space Telescope Guide Star Catalog (GSC) ID 04671-00094
Discovered by
Discovery Paper - Authors "Lewis C. Roberts, Jr., Andrei Tokovinin, Brian D. Mason, Reed L. Riddle, William I. Hartkopf, Nicholas M. Law, Christoph Baranec"
Discovery Paper - Title "Know the Star, Know the Planet. III. Discovery of Late-Type Companions to Two Exoplanet Host Stars"
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+2638+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%202638%20b/
HD 2638 b
HD 2638 b

  • HD 2638 b is an exoplanet orbiting the star HD 2638, located about 175.2 light-years (53.7 pc) away from Solar System. Its discovery was publicly announced on 2005.
  • The host star HD 2638 has apparent magnitude of 9.4, with absolute magnitude of 5.8.
  • It is 0.9 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5192 with its spectral types of G5
  • In this planetary system, the extrasolar planet HD 2638 b orbits around the star HD 2638 every 3.4 days with its orbital distance of 0.04 AU ( 6582306.3 km)
  • (Projected orbit of HD 2638 b around its host star HD 2638)


  • The Star HD 2638 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.520 AU ( 77731694.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.718 AU ( 107445515.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.094 AU ( 163723188.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.610 AU ( 240925843.6 km)
  • Radiation at Planetary Boundary of HD 2638 b : 364400.95 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 2638)



  • Kopparapu Recent Venus for Star HD 2638 distance : 0.557 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 2638 distance : 0.705 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 2638 distance : 0.681 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 2638 distance : 0.747 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 2638 distance : 1.268 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 2638 distance : 1.338 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 2638)



  • Original Kopparapu Recent Venus for Star HD 2638 distance : 0.552 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 2638 distance : 0.726 AU
  • Original Kopparapu Moist Greenhouse for Star HD 2638 distance : 0.730 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 2638 distance : 1.290 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 2638 distance : 1.341 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 2638)



    (Position in Stellar Map of star HD 2638 and its Exoplanet HD 2638 b)



    (Zoomed position in Stellar Map of star HD 2638 and its Exoplanet HD 2638 b (zoom level 3))

    (Synthetic Spectrum of star HD 2638*)
    *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