Imaginary Picture of KELT-2 A b

Display orbital revolution of KELT-2 A b around the hoststar KELT-2 A
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Exoplanet Name : KELT-2 A b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 1.3060 (Rjup) 14.6390 (Rearth)
Mass (Mjup / Me): 1.4860 (Mjup) 472.4559 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0550 (AU) 0.0550 (AU Est.)
Eccentricity : 0.1850
Orbital Period(Yrs) 0.0113
Orbital Period(Observed/Estimated) 4.11 (Days Obs.) 4.11 (Days Est.)
Surface Gravity (G Earth) 2.2047
Star Radiation at Atmospheric Boundary: 1966572.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1671.4 (K)
Blackbody T 0.3(K) 1569.6 (K)
Blackbody T 0.7(K) 1270.0 (K)
Tidally Locked Blackbody T 0.1(K) 1987.6 (K)
Tidally Locked Blackbody T 0.3(K) 1866.6 (K)
Size Class: Super-Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : KELT-2 A
Alternate Name :
Star Distance(LY) : 420.4
Stellar Radius(Rsun) : 1.8 (Rsun Measured)
Stellar Mass(Msun) : 1.3 (Msun Measured) 1.3 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 6148 (K)
Spectral type : F7V
UV portion[%]: 0.3
Visible portion[%]: 1.5
IR portion[%]: 98.2
Metalicity : -0.0
Absolute Magnitude: 3.1
Apparent Magnitude: 8.7
Right Ascension(RA) 92.6639
Declination (DEC) 30.9572
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Beatty,homas.; Pepper,oshua; Siverd,obert.; Eastman,ason.; Bieryla,llyson; Latham,avid.; Buchhave,ars.; Jensen,ric..; Manner,ark; Stassun,eivan.; Gaudi,.cott; Berlind,erry; Calkins,ichael.; Collins,aren; DePoy,arren.; Esquerdo,ilbert.; Fulton,enjamin.; F_r_sz,_bor; Geary,ohn.; Gould,ndrew; Hebb,eslie; Kielkopf,ohn.; Marshall,ennifer.; Pogge,ichard; Stanek,..; Stefanik,obert.; Street,achel; Szentgyorgyi,ndrew.; Trueblood,ark; Trueblood,atricia; Stutz,melia."
Discovery Paper - Title KELT-2Ab: A Hot Jupiter Transiting the Bright (V = 8.77) Primary Star of a Binary System
Discovery Paper - Journal "The Astrophysical Journal Letters,olume 756,umber 2"
Discovery Paper - URL http://iopscience.iop.org/article/10.1088/2041-8205/756/2/L39/meta
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=KELT-2A+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/KELT-2A%20b/
KELT-2 A b
KELT-2 A b
  • KELT-2 A b is an exoplanet orbiting the star KELT-2 A, located about 420.4 light-years (128.9 pc) away from Solar System. Its discovery was publicly announced on 2012.
  • The host star KELT-2 A has apparent magnitude of 8.7, with absolute magnitude of 3.1.
  • It is 1.3 times more massive and 1.8 times bigger compared with our Sun. The surface temperature is 6148 with its spectral types of F7V
  • In this planetary system, the extrasolar planet KELT-2 A b orbits around the star KELT-2 A every 4.1 days with its orbital distance of 0.05 AU ( 8224890.9 km)
    • (Projected orbit of KELT-2 A b around its host star KELT-2 A)


  • The Star KELT-2 A 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.508 AU ( 225639670.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 2.085 AU ( 311892990.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 3.177 AU ( 475255896.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 4.675 AU ( 699359870.7 km)
  • Radiation at Planetary Boundary of KELT-2 A b : 1966572.79 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star KELT-2 A)



  • Kopparapu Recent Venus for Star KELT-2 A distance : 1.529 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star KELT-2 A distance : 1.936 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star KELT-2 A distance : 1.869 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star KELT-2 A distance : 2.049 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star KELT-2 A distance : 3.389 AU
  • Kopparapu Outer Boundary for Early Mars for Star KELT-2 A distance : 3.574 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star KELT-2 A)



  • Original Kopparapu Recent Venus for Star KELT-2 A distance : 1.542 AU
  • Original Kopparapu Runaway Greenhouse for Star KELT-2 A distance : 1.987 AU
  • Original Kopparapu Moist Greenhouse for Star KELT-2 A distance : 2.041 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star KELT-2 A distance : 3.449 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star KELT-2 A distance : 3.587 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star KELT-2 A)



    (Position in Stellar Map of star KELT-2 A and its Exoplanet KELT-2 A b)



    (Zoomed position in Stellar Map of star KELT-2 A and its Exoplanet KELT-2 A b (zoom level 3))

    (Synthetic Spectrum of star KELT-2 A*)
    *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