Imaginary Picture of Kepler-33 d
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Exoplanet Name : Kepler-33 d
Alternate Name :
Radius (Rjup / Re): 0.4800 (Rjup) 5.3803 (Rearth)
Mass (Mjup / Me): 0.1084 (Mjup) 34.4663 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1662 (AU) 0.1662 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0596
Orbital Period(Observed/Estimated) 21.78 (Days Obs.) 21.78 (Days Est.)
Star Radiation at Atmospheric Boundary: 152100.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 881.4 (K)
Blackbody T 0.3(K) 827.7 (K)
Blackbody T 0.7(K) 669.7 (K)
Tidally Locked Blackbody T 0.1(K) 1048.2 (K)
Tidally Locked Blackbody T 0.3(K) 984.3 (K)
Size Class: sub-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 : Kepler-33
Alternate Name :
Star Distance(LY) : 3941.9
Stellar Radius(Rsun) : 1.7 (Rsun Measured)
Stellar Mass(Msun) : 1.3 (Msun Measured) 1.3 (Msun Estimated)
Star Age : 4.3 (GY)
Temperature : 5947 (K)
Spectral type : G1
Metalicity : 0.0
Absolute Magnitude: 3.6
Apparent Magnitude: 14.0
Right Ascension(RA) 289.0792
Declination (DEC) 46.0053
Hubble Space Telescope Guide Star Catalog (GSC) ID 03542-01616
Discovered by
Discovery Paper - Authors "Lissauer,ack.; Marcy,eoffrey.; Rowe,ason.; Bryson,tephen.; Adams,lisabeth; Buchhave,ars.; Ciardi,avid.; Cochran,illiam.; Fabrycky,aniel.; Ford,ric.; Fressin,rancois; Geary,ohn; Gilliland,onald.; Holman,atthew.; Howell,teve.; Jenkins,on.; Kinemuchi,aren; Koch,avid.; Morehead,obert.; Ragozzine,arin; Seader,hawn.; Tanenbaum,eter.; Torres,uillermo; Twicken,oseph."
Discovery Paper - Title Almost All of Kepler's Multiple-planet Candidates Are Planets
Discovery Paper - Journal "The Astrophysical Journal,olume 750,umber 2"
Discovery Paper - URL http://iopscience.iop.org/article/10.1088/0004-637X/750/2/112/meta
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-33+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-33%20d/
Kepler-33 d
Kepler-33 d

  • Kepler-33 d is an exoplanet orbiting the star Kepler-33, located about 3941.9 light-years (1208.6 pc) away from Solar System. Its discovery was publicly announced on 2012.
  • The host star Kepler-33 has apparent magnitude of 14.0, with absolute magnitude of 3.6.
  • It is 1.3 times more massive and 1.7 times bigger compared with our Sun. The surface temperature is 5947 with its spectral types of G1
  • In this planetary system, the extrasolar planet Kepler-33 d orbits around the star Kepler-33 every 21.8 days with its orbital distance of 0.17 AU ( 24863166.1 km)
  • (Projected orbit of Kepler-33 d around its host star Kepler-33)


  • The Star Kepler-33 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.268 AU ( 189693298.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.753 AU ( 262205710.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.671 AU ( 399543477.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.930 AU ( 587945729.7 km)
  • Radiation at Planetary Boundary of Kepler-33 d : 152100.46 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-33)



  • Kopparapu Recent Venus for Star Kepler-33 distance : 1.301 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-33 distance : 1.647 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-33 distance : 1.591 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-33 distance : 1.744 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-33 distance : 2.897 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-33 distance : 3.055 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-33)



  • Original Kopparapu Recent Venus for Star Kepler-33 distance : 1.307 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-33 distance : 1.692 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-33 distance : 1.729 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-33 distance : 2.948 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-33 distance : 3.066 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-33)



    (Position in Stellar Map of star Kepler-33 and its Exoplanet Kepler-33 d)



    (Zoomed position in Stellar Map of star Kepler-33 and its Exoplanet Kepler-33 d (zoom level 3))