Imaginary Picture of Kepler-446 c

Display orbital revolution of Kepler-446 c around the hoststar Kepler-446
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Exoplanet Name : Kepler-446 c
Alternate Name : "2MASS J18490005+4455160 c, K02842.03, KIC 8733898 c, KOI-2842 c, KOI-2842.03, WISE J184900.02+445515.7 c"
Radius (Rjup / Re): 0.1000 (Rjup) 1.1209 (Rearth)
Mass (Mjup / Me): 0.0090 (Mjup) 2.8614 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0248 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0083
Orbital Period(Observed/Estimated) 3.04 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 2.2775
Star Radiation at Atmospheric Boundary: 11979.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 466.9 (K)
Blackbody T 0.3(K) 438.5 (K)
Blackbody T 0.7(K) 354.8 (K)
Tidally Locked Blackbody T 0.1(K) 555.3 (K)
Tidally Locked Blackbody T 0.3(K) 521.5 (K)
Size Class: Earth-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Theoretical
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : Kepler-446
Alternate Name : "2MASS J18490005+4455160, KIC 8733898, KOI-2842, WISE J184900.02+445515.7"
Star Distance(LY) : 314.2
Stellar Radius(Rsun) : 0.2 (Rsun Measured)
Stellar Mass(Msun) : 0.2 (Msun Measured) 0.2 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3359 (K)
Spectral type : M4
UV portion[%]: 0.2
Visible portion[%]: 12.4
IR portion[%]: 87.4
Metalicity : -0.3
Absolute Magnitude: 11.6
Apparent Magnitude: 16.5
Right Ascension(RA) 282.2502
Declination (DEC) 44.9211
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Philip S. Muirhead, Andrew W. Mann, Andrew Vanderburg, Timothy D. Morton, Adam Kraus, Michael Ireland, Jonathan J. Swift, Gregory A. Feiden, Eric Gaidos, J. Zachary Gazak"
Discovery Paper - Title "Kepler-445, Kepler-446 and the Occurrence of Compact Multiples Orbiting Mid-M Dwarf Stars"
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-446+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-446%20c/
Kepler-446 c
Kepler-446 c

  • Kepler-446 c is an exoplanet orbiting the star Kepler-446, located about 314.2 light-years (96.3 pc) away from Solar System. Its discovery was publicly announced on 2015.
  • The host star Kepler-446 has apparent magnitude of 16.5, with absolute magnitude of 11.6.
  • It is 0.2 times more massive and 0.2 times bigger compared with our Sun. The surface temperature is 3359 with its spectral types of M4
  • In this planetary system, the extrasolar planet Kepler-446 c orbits around the star Kepler-446 every 3.0 days with its orbital distance of 0.02 AU ( 3705877.6 km)
  • (Projected orbit of Kepler-446 c around its host star Kepler-446)


  • The Star Kepler-446 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.053 AU ( 7934834.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.073 AU ( 10968014.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.112 AU ( 16712826.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.164 AU ( 24593656.7 km)
  • Radiation at Planetary Boundary of Kepler-446 c : 11979.34 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-446)



  • Kopparapu Recent Venus for Star Kepler-446 distance : 0.060 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-446 distance : 0.076 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-446 distance : 0.073 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-446 distance : 0.081 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-446 distance : 0.149 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-446 distance : 0.157 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-446)



  • Original Kopparapu Recent Venus for Star Kepler-446 distance : 0.060 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-446 distance : 0.079 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-446 distance : 0.079 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-446 distance : 0.151 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-446 distance : 0.157 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-446)



    (Position in Stellar Map of star Kepler-446 and its Exoplanet Kepler-446 c)



    (Zoomed position in Stellar Map of star Kepler-446 and its Exoplanet Kepler-446 c (zoom level 3))

    (Synthetic Spectrum of star Kepler-446*)
    *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