Imaginary Picture of Kepler-444 b

Display orbital revolution of Kepler-444 b around the hoststar Kepler-444
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Exoplanet Name : Kepler-444 b
Alternate Name : "Kepler-444 b, 2MASS J19190052+4138043 b, BD+41 3306 b, HIP 94931 b, K03158.01, KIC 6278762 b, KOI-3158 b, KOI-3158.01,
Status : Confirmed
Radius (Rjup / Re): 0.0360 (Rjup) 0.4030 (Rearth)
Mass (Mjup / Me): 0.0001 (Mjup) 0.0420 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0418 (AU) 0.0418 (AU Est.)
Eccentricity : 0.1600
Orbital Period(Yrs) 0.0099
Orbital Period(Observed/Estimated) 3.60 (Days Obs.) 3.58 (Days Est.)
Surface Gravity (G Earth) 0.2584
Star Radiation at Atmospheric Boundary: 292662.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1038.1 (K)
Blackbody T 0.3(K) 974.9 (K)
Blackbody T 0.7(K) 788.8 (K)
Tidally Locked Blackbody T 0.1(K) 1234.5 (K)
Tidally Locked Blackbody T 0.3(K) 1159.3 (K)
Size Class: Mercury-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
Alternate Name : "Kepler-444, 2MASS J19190052+4138043, BD+41 3306, HIP 94931, KIC 6278762, KOI-3158, Kepler-444 A, LHS 3450, TYC 3129-003p
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 : 4947 (K)
Spectral type : K
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) 41.6346
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%20b/
Kepler-444 b
Kepler-444 b

  • Kepler-444 b is an exoplanet orbiting the star Kepler-444, 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 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 4947 with its spectral types of K
  • In this planetary system, the extrasolar planet Kepler-444 b orbits around the star Kepler-444 every 3.6 days with its orbital distance of 0.04 AU ( 6250199.0 km)
  • (Projected orbit of Kepler-444 b around its host star Kepler-444)


  • The Star Kepler-444 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.442 AU ( 66146669.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.611 AU ( 91431983.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.931 AU ( 139322109.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.370 AU ( 205018587.3 km)
  • Radiation at Planetary Boundary of Kepler-444 b : 292662.91 W/m2

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



  • Kopparapu Recent Venus for Star Kepler-444 distance : 0.480 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-444 distance : 0.607 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-444 distance : 0.586 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-444 distance : 0.644 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-444 distance : 1.103 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-444 distance : 1.163 AU

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



  • Original Kopparapu Recent Venus for Star Kepler-444 distance : 0.474 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-444 distance : 0.626 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-444 distance : 0.627 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-444 distance : 1.121 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-444 distance : 1.166 AU

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



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



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

    (Synthetic Spectrum of star Kepler-444*)
    *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