Imaginary Picture of BD+20 274 c
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Exoplanet Name : BD+20 274 c
Alternate Name :
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 4.2000 (Mjup) 1335.3396 (Mearth)
Semi Major Axis / Orbital Distance Calculated 1.3000 (AU) 1.3000 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 1.5830
Orbital Period(Observed/Estimated) 578.20 (Days Obs.) 605.29 (Days Est.)
Star Radiation at Atmospheric Boundary: 73972.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 736.1 (K)
Blackbody T 0.3(K) 691.2 (K)
Blackbody T 0.7(K) 559.3 (K)
Tidally Locked Blackbody T 0.1(K) 875.3 (K)
Tidally Locked Blackbody T 0.3(K) 822.0 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : BD+20 274
Alternate Name :
Star Distance(LY) : 3545.2
Stellar Radius(Rsun) : 17.3 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4296 (K)
Spectral type : K5
Metalicity : -0.5
Absolute Magnitude: -0.8
Apparent Magnitude: 9.4
Right Ascension(RA) 25.9203
Declination (DEC) 21.0050
Hubble Space Telescope Guide Star Catalog (GSC) ID 01211-00603
Discovered by
Discovery Paper - Authors "Gettel,.; Wolszczan,.; Niedzielski,.; Nowak,.; Adam_w,.; Zieli_ski,.; Maciejewski,."
Discovery Paper - Title Planets around the K-giants BD+20 274 and HD 219415
Discovery Paper - Journal "The Astrophysical Journal,olume 756,umber 1"
Discovery Paper - URL http://iopscience.iop.org/article/10.1088/0004-637X/756/1/53/meta
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=BD%2B20+274+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/BD%2B20%20274%20b/
BD+20 274 c
BD+20 274 c

  • BD+20 274 c is an exoplanet orbiting the star BD+20 274, located about 3545.2 light-years (1087.0 pc) away from Solar System. Its discovery was publicly announced on 2012.
  • The host star BD+20 274 has apparent magnitude of 9.4, with absolute magnitude of -0.8.
  • It is 0.8 times more massive and 17.3 times bigger compared with our Sun. The surface temperature is 4296 with its spectral types of K5
  • In this planetary system, the extrasolar planet BD+20 274 c orbits around the star BD+20 274 every 578.2 days with its orbital distance of 1.30 AU ( 194477231.9 km)
  • (Projected orbit of BD+20 274 c around its host star BD+20 274)


  • The Star BD+20 274 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 6.917 AU ( 1034743628.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 9.561 AU ( 1430286105.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 14.569 AU ( 2179439503.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 21.438 AU ( 3207140704.5 km)
  • Radiation at Planetary Boundary of BD+20 274 c : 73972.01 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star BD+20 274)



  • Kopparapu Recent Venus for Star BD+20 274 distance : 7.690 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star BD+20 274 distance : 9.734 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star BD+20 274 distance : 9.402 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star BD+20 274 distance : 10.329 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star BD+20 274 distance : 18.206 AU
  • Kopparapu Outer Boundary for Early Mars for Star BD+20 274 distance : 19.206 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star BD+20 274)



  • Original Kopparapu Recent Venus for Star BD+20 274 distance : 7.588 AU
  • Original Kopparapu Runaway Greenhouse for Star BD+20 274 distance : 10.056 AU
  • Original Kopparapu Moist Greenhouse for Star BD+20 274 distance : 10.040 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star BD+20 274 distance : 18.500 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star BD+20 274 distance : 19.240 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star BD+20 274)



    (Position in Stellar Map of star BD+20 274 and its Exoplanet BD+20 274 c)



    (Zoomed position in Stellar Map of star BD+20 274 and its Exoplanet BD+20 274 c (zoom level 3))