Imaginary Picture of K2-149 b

Display orbital revolution of K2-149 b around the hoststar K2-149
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Exoplanet Name : K2-149 b
Alternate Name : "2MASS J00391724+0716375 b, EPIC 220522664 b, WISE J003917.22+071637.3 b"
Status : Confirmed
Radius (Rjup / Re): 0.1460 (Rjup) 1.6365 (Rearth)
Mass (Mjup / Me): 0.0131 (Mjup) 4.1712 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0830 (AU) 0.0830 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0310
Orbital Period(Observed/Estimated) 11.33 (Days Obs.) 11.37 (Days Est.)
Surface Gravity (G Earth) 1.5575
Star Radiation at Atmospheric Boundary: 11376.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 460.9 (K)
Blackbody T 0.3(K) 432.9 (K)
Blackbody T 0.7(K) 350.2 (K)
Tidally Locked Blackbody T 0.1(K) 548.2 (K)
Tidally Locked Blackbody T 0.3(K) 514.8 (K)
Size Class: super-Earth-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 : K2-149
Alternate Name : "2MASS J00391724+0716375, EPIC 220522664, WISE J003917.22+071637.3"
Star Distance(LY) : 404.1
Stellar Radius(Rsun) : 0.6 (Rsun Measured)
Stellar Mass(Msun) : 0.6 (Msun Measured) 0.6 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3745 (K)
Spectral type : M1.0 V
UV portion[%]: 0.4
Visible portion[%]: 18.8
IR portion[%]: 80.7
Metalicity : 0.1
Absolute Magnitude: 6.0
Apparent Magnitude: 11.5
Right Ascension(RA) 9.8219
Declination (DEC) 7.2771
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-id?Ident=EPIC%20220522664&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
Open Exoplanet Database Link
K2-149 b
K2-149 b

  • K2-149 b is an exoplanet orbiting the star K2-149, located about 404.1 light-years (123.9 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-149 has apparent magnitude of 11.5, with absolute magnitude of 6.0.
  • It is 0.6 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 3745 with its spectral types of M1.0 V
  • In this planetary system, the extrasolar planet K2-149 b orbits around the star K2-149 every 11.3 days with its orbital distance of 0.08 AU ( 12416623.3 km)
  • (Projected orbit of K2-149 b around its host star K2-149)


  • The Star K2-149 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.173 AU ( 25908162.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.239 AU ( 35811851.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.365 AU ( 54569336.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.537 AU ( 80301168.5 km)
  • Radiation at Planetary Boundary of K2-149 b : 11376.42 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-149)



  • Kopparapu Recent Venus for Star K2-149 distance : 0.195 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-149 distance : 0.247 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-149 distance : 0.238 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-149 distance : 0.262 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-149 distance : 0.474 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-149 distance : 0.500 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-149)



  • Original Kopparapu Recent Venus for Star K2-149 distance : 0.193 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-149 distance : 0.255 AU
  • Original Kopparapu Moist Greenhouse for Star K2-149 distance : 0.255 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-149 distance : 0.482 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-149 distance : 0.501 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-149)



    (Position in Stellar Map of star K2-149 and its Exoplanet K2-149 b)



    (Zoomed position in Stellar Map of star K2-149 and its Exoplanet K2-149 b (zoom level 3))

    (Synthetic Spectrum of star K2-149*)
    *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