Imaginary Picture of Kepler-444 A d

Display orbital revolution of Kepler-444 A d around the hoststar Kepler-444 A
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Exoplanet Name : Kepler-444 A d
Alternate Name : Kepler-444 d
Radius (Rjup / Re): 0.0455 (Rjup) 0.5100 (Rearth)
Mass (Mjup / Me): 0.0003 (Mjup) 0.0931 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0600 (AU) 0.0600 (AU Est.)
Eccentricity : 0.1800
Orbital Period(Yrs) 0.0169
Orbital Period(Observed/Estimated) 6.19 (Days Obs.) 6.17 (Days Est.)
Surface Gravity (G Earth) 0.3579
Star Radiation at Atmospheric Boundary: 124889.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 839.0 (K)
Blackbody T 0.3(K) 787.9 (K)
Blackbody T 0.7(K) 637.5 (K)
Tidally Locked Blackbody T 0.1(K) 997.8 (K)
Tidally Locked Blackbody T 0.3(K) 937.0 (K)
Size Class: Mars-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : Kepler-444 A
Alternate Name : Kepler-444
Star Distance(LY) : 116.4
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 11.2 (GY)
Temperature : 5046 (K)
Spectral type : K1
UV portion[%]: 3.5
Visible portion[%]: 37.6
IR portion[%]: 58.8
Metalicity : -0.6
Absolute Magnitude: 6.2
Apparent Magnitude: 9.0
Right Ascension(RA) 289.7523
Declination (DEC) 41.6347
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "T. L. Campante, T. Barclay, J. J. Swift, D. Huber, V. Zh. Adibekyan, W. Cochran, C. J. Burke, H. Isaacson, E. V. Quintana, G. R. Davies, V. Silva Aguirre, D. Ragozzine, R. Riddle, C. Baranec, S. Basu, W. J. Chaplin, J. Christensen-Dalsgaard, T. S. Metcalfe, T. R. Bedding, R. Handberg, D. Stello, J. M. Brewer, S. Hekker, C. Karoff, R. Kolbl, N. M. Law, M. Lundkvist, A. Miglio, J. F. Rowe, N. C. Santos, C. Van Laerhoven, T. Arentoft, Y. P. Elsworth, D. A. Fischer, S. D. Kawaler, H. Kjeldsen, M. N. Lund, G. W. Marcy, S. G. Sousa, A. Sozzetti, T. R. White"
Discovery Paper - Title An ancient extrasolar system with five sub-Earth-size planets
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-444+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-444%20d/
Kepler-444 A d
Kepler-444 A d
  • Kepler-444 A d is an exoplanet orbiting the star Kepler-444 A, located about 116.4 light-years (35.7 pc) away from Solar System. Its discovery was publicly announced on 2015.
  • The host star Kepler-444 A has apparent magnitude of 9.0, with absolute magnitude of 6.2.
  • It is 0.8 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5046 with its spectral types of K1
  • In this planetary system, the extrasolar planet Kepler-444 A d orbits around the star Kepler-444 A every 6.2 days with its orbital distance of 0.06 AU ( 8975872.2 km)
    • (Projected orbit of Kepler-444 A d around its host star Kepler-444 A)


  • The Star Kepler-444 A 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.415 AU ( 62054094.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.573 AU ( 85774975.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.874 AU ( 130702081.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.286 AU ( 192333838.1 km)
  • Radiation at Planetary Boundary of Kepler-444 A d : 124889.80 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-444 A)



  • Kopparapu Recent Venus for Star Kepler-444 A distance : 0.448 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-444 A distance : 0.567 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-444 A distance : 0.548 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-444 A distance : 0.601 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-444 A distance : 1.026 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-444 A distance : 1.082 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-444 A)



  • Original Kopparapu Recent Venus for Star Kepler-444 A distance : 0.443 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-444 A distance : 0.584 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-444 A distance : 0.586 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-444 A distance : 1.043 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-444 A distance : 1.085 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-444 A)



    (Position in Stellar Map of star Kepler-444 A and its Exoplanet Kepler-444 A d)



    (Zoomed position in Stellar Map of star Kepler-444 A and its Exoplanet Kepler-444 A d (zoom level 3))