Imaginary Picture of K2-146 c

Display orbital revolution of K2-146 c around the hoststar K2-146
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Exoplanet Name : K2-146 c
Alternate Name : "2MASS J08400641+1905346 c, EPIC 211924657 c, WISE J084006.4
Radius (Rjup / Re): 0.1950 (Rjup) 2.1858 (Rearth)
Mass (Mjup / Me): 0.0236 (Mjup) 7.4970 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0340 (AU) 0.0340 (AU Est.)
Eccentricity : 0.0750
Orbital Period(Yrs) 0.0110
Orbital Period(Observed/Estimated) 4.00 (Days Obs.) 3.99 (Days Est.)
Surface Gravity (G Earth) 1.5692
Star Radiation at Atmospheric Boundary: 15167.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 495.3 (K)
Blackbody T 0.3(K) 465.1 (K)
Blackbody T 0.7(K) 376.3 (K)
Tidally Locked Blackbody T 0.1(K) 589.0 (K)
Tidally Locked Blackbody T 0.3(K) 553.1 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : TTV
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-146
Alternate Name : "UCAC3 219-93463, 2MASS J08400641+1905346, K2-146, EPIC 211924653RHD3@ު6^'@
Star Distance(LY) : 259.2
Stellar Radius(Rsun) : 0.3 (Rsun Measured)
Stellar Mass(Msun) : 0.3 (Msun Measured) 0.3 (Msun Estimated)
Star Age : 5.0 (GY)
Temperature : 3385 (K)
Spectral type : M3.0 V
UV portion[%]: 0.3
Visible portion[%]: 12.2
IR portion[%]: 87.5
Metalicity : -0.0
Absolute Magnitude: 11.7
Apparent Magnitude: 16.2
Right Ascension(RA) 130.0268
Declination (DEC) 19.0929
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=K2-146+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-146 c
K2-146 c

  • K2-146 c is an exoplanet orbiting the star K2-146, located about 259.2 light-years (79.5 pc) away from Solar System. Its discovery was publicly announced on 2019.
  • The host star K2-146 has apparent magnitude of 16.2, with absolute magnitude of 11.7.
  • It is 0.3 times more massive and 0.3 times bigger compared with our Sun. The surface temperature is 3385 with its spectral types of M3.0 V
  • In this planetary system, the extrasolar planet K2-146 c orbits around the star K2-146 every 4.0 days with its orbital distance of 0.03 AU ( 5086327.6 km)
  • (Projected orbit of K2-146 c around its host star K2-146)


  • The Star K2-146 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.082 AU ( 12254325.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.113 AU ( 16938679.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.173 AU ( 25810799.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.254 AU ( 37981722.0 km)
  • Radiation at Planetary Boundary of K2-146 c : 15167.34 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-146)



  • Kopparapu Recent Venus for Star K2-146 distance : 0.093 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-146 distance : 0.117 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-146 distance : 0.113 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-146 distance : 0.125 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-146 distance : 0.229 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-146 distance : 0.242 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-146)



  • Original Kopparapu Recent Venus for Star K2-146 distance : 0.092 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-146 distance : 0.121 AU
  • Original Kopparapu Moist Greenhouse for Star K2-146 distance : 0.122 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-146 distance : 0.233 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-146 distance : 0.242 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-146)



    (Position in Stellar Map of star K2-146 and its Exoplanet K2-146 c)



    (Zoomed position in Stellar Map of star K2-146 and its Exoplanet K2-146 c (zoom level 3))

    (Synthetic Spectrum of star K2-146*)
    *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