Imaginary Picture of K2-287 b

Display orbital revolution of K2-287 b around the hoststar K2-287
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Exoplanet Name : K2-287 b
Alternate Name : "2MASS J15321784-2221297 b, EPIC 249451861 b, TYC 6196-185-1 b, WISE J153217.84-222129.9 b"
Status : Confirmed
Radius (Rjup / Re): 0.8470 (Rjup) 9.4940 (Rearth)
Mass (Mjup / Me): 0.3150 (Mjup) 100.1505 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1206 (AU) 0.1206 (AU Est.)
Eccentricity : 0.4780
Orbital Period(Yrs) 0.0408
Orbital Period(Observed/Estimated) 14.89 (Days Obs.) 14.86 (Days Est.)
Surface Gravity (G Earth) 1.1111
Star Radiation at Atmospheric Boundary: 101543.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 796.7 (K)
Blackbody T 0.3(K) 748.2 (K)
Blackbody T 0.7(K) 605.4 (K)
Tidally Locked Blackbody T 0.1(K) 947.5 (K)
Tidally Locked Blackbody T 0.3(K) 889.8 (K)
Size Class: Jupiter-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 : K2-287
Alternate Name : "EPIC 249451861, 2MASS J15321784-2221297, TYC 6196-185-1, WISE J153217.84-222129.9"
Star Distance(LY) : 518.8
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 4.5 (GY)
Temperature : 5695 (K)
Spectral type : G4
UV portion[%]: 7.6
Visible portion[%]: 44.4
IR portion[%]: 48.0
Metalicity : 0.2
Absolute Magnitude: 5.4
Apparent Magnitude: 11.4
Right Ascension(RA) 233.0743
Declination (DEC) -22.3583
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK
Open Exoplanet Database Link
K2-287 b
K2-287 b

  • K2-287 b is an exoplanet orbiting the star K2-287, located about 518.8 light-years (159.1 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-287 has apparent magnitude of 11.4, with absolute magnitude of 5.4.
  • It is 1.1 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5695 with its spectral types of G4
  • In this planetary system, the extrasolar planet K2-287 b orbits around the star K2-287 every 14.9 days with its orbital distance of 0.12 AU ( 18041503.2 km)
  • (Projected orbit of K2-287 b around its host star K2-287)


  • The Star K2-287 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.752 AU ( 112468097.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.039 AU ( 155460301.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.583 AU ( 236887096.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.330 AU ( 348589739.5 km)
  • Radiation at Planetary Boundary of K2-287 b : 101543.63 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-287)



  • Kopparapu Recent Venus for Star K2-287 distance : 0.783 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-287 distance : 0.992 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-287 distance : 0.958 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-287 distance : 1.050 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-287 distance : 1.755 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-287 distance : 1.851 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-287)



  • Original Kopparapu Recent Venus for Star K2-287 distance : 0.783 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-287 distance : 1.019 AU
  • Original Kopparapu Moist Greenhouse for Star K2-287 distance : 1.036 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-287 distance : 1.786 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-287 distance : 1.857 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-287)



    (Position in Stellar Map of star K2-287 and its Exoplanet K2-287 b)



    (Zoomed position in Stellar Map of star K2-287 and its Exoplanet K2-287 b (zoom level 3))

    (Synthetic Spectrum of star K2-287*)
    *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