Imaginary Picture of K2-27 b

Display orbital revolution of K2-27 b around the hoststar K2-27
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Exoplanet Name : K2-27 b
Alternate Name : "EPIC 201546283 b, 2MASS J11260363+0113505 b, EPIC 201546283
Radius (Rjup / Re): 0.4000 (Rjup) 4.4836 (Rearth)
Mass (Mjup / Me): 0.0972 (Mjup) 30.9099 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0670 (AU) 0.0670 (AU Est.)
Eccentricity : 0.2510
Orbital Period(Yrs) 0.0185
Orbital Period(Observed/Estimated) 6.77 (Days Obs.) 6.79 (Days Est.)
Surface Gravity (G Earth) 1.5376
Star Radiation at Atmospheric Boundary: 164040.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 898.2 (K)
Blackbody T 0.3(K) 843.5 (K)
Blackbody T 0.7(K) 682.5 (K)
Tidally Locked Blackbody T 0.1(K) 1068.2 (K)
Tidally Locked Blackbody T 0.3(K) 1003.1 (K)
Size Class: Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-27
Alternate Name : "EPIC 201546283, 2MASS J11260363+0113505, K2-27 B, WISE J112603.$*= v?T?類@
Star Distance(LY) : 820.1
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 10.3 (GY)
Temperature : 5248 (K)
Spectral type : K0
UV portion[%]: 5.4
Visible portion[%]: 40.8
IR portion[%]: 53.8
Metalicity : 0.1
Absolute Magnitude: 4.2
Apparent Magnitude: 11.2
Right Ascension(RA) 171.5152
Declination (DEC) 1.2307
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Benjamin T. Montet, Timothy D. Morton, Daniel Foreman-Mackey, John Asher Johnson, David W. Hogg, Brendan P. Bowler, David W. Latham, Allyson Bieryla, Andrew W. Mann, "
Discovery Paper - Title "STELLAR AND PLANETARY PROPERTIES OF K2 CAMPAIGN 1 CANDIDATES AND VALIDATION OF 18 SYSTEMS, INCLUDING A PLANET RECEIVING EARTH-LIKE INSOLATION "
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=K2-27+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/EPIC%20201546283%20b/
K2-27 b
K2-27 b

  • K2-27 b is an exoplanet orbiting the star K2-27, located about 820.1 light-years (251.4 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star K2-27 has apparent magnitude of 11.2, with absolute magnitude of 4.2.
  • It is 0.9 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5248 with its spectral types of K0
  • In this planetary system, the extrasolar planet K2-27 b orbits around the star K2-27 every 6.8 days with its orbital distance of 0.07 AU ( 10026049.3 km)
  • (Projected orbit of K2-27 b around its host star K2-27)


  • The Star K2-27 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.531 AU ( 79439366.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.734 AU ( 109805964.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.118 AU ( 167319989.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.646 AU ( 246218694.7 km)
  • Radiation at Planetary Boundary of K2-27 b : 164040.57 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-27)



  • Kopparapu Recent Venus for Star K2-27 distance : 0.567 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-27 distance : 0.718 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-27 distance : 0.694 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-27 distance : 0.761 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-27 distance : 1.290 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-27 distance : 1.360 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-27)



  • Original Kopparapu Recent Venus for Star K2-27 distance : 0.563 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-27 distance : 0.740 AU
  • Original Kopparapu Moist Greenhouse for Star K2-27 distance : 0.745 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-27 distance : 1.312 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-27 distance : 1.364 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-27)



    (Position in Stellar Map of star K2-27 and its Exoplanet K2-27 b)



    (Zoomed position in Stellar Map of star K2-27 and its Exoplanet K2-27 b (zoom level 3))

    (Synthetic Spectrum of star K2-27*)
    *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