Imaginary Picture of K2-278 b

Display orbital revolution of K2-278 b around the hoststar K2-278
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Exoplanet Name : K2-278 b
Alternate Name : "2MASS J13331242-1430146 b, EPIC 212418133 b, EPIC 212418133.01, WISE J133312.44-143014.7 b"
Status : Confirmed
Radius (Rjup / Re): 0.2660 (Rjup) 2.9816 (Rearth)
Mass (Mjup / Me): 0.0229 (Mjup) 7.2870 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0488 (AU) 0.0488 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0091
Orbital Period(Observed/Estimated) 3.33 (Days Obs.) 3.33 (Days Est.)
Surface Gravity (G Earth) 0.8197
Star Radiation at Atmospheric Boundary: 2766048.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1820.2 (K)
Blackbody T 0.3(K) 1709.3 (K)
Blackbody T 0.7(K) 1383.0 (K)
Tidally Locked Blackbody T 0.1(K) 2164.5 (K)
Tidally Locked Blackbody T 0.3(K) 2032.7 (K)
Size Class: sub-Neptune-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 : K2-278
Alternate Name : "2MASS J13331242-1430146, EPIC 212418133, WISE J133312.44-143014.7"
Star Distance(LY) : 2545.5
Stellar Radius(Rsun) : 1.6 (Rsun Measured)
Stellar Mass(Msun) : 1.4 (Msun Measured) 1.4 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 6747 (K)
Spectral type : F4
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : 0.0
Absolute Magnitude: 2.6
Apparent Magnitude: 12.1
Right Ascension(RA) 203.3018
Declination (DEC) -14.5041
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=K2-278+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-278 b
K2-278 b

  • K2-278 b is an exoplanet orbiting the star K2-278, located about 2545.5 light-years (780.5 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-278 has apparent magnitude of 12.1, with absolute magnitude of 2.6.
  • It is 1.4 times more massive and 1.6 times bigger compared with our Sun. The surface temperature is 6747 with its spectral types of F4
  • In this planetary system, the extrasolar planet K2-278 b orbits around the star K2-278 every 3.3 days with its orbital distance of 0.05 AU ( 7300376.1 km)
  • (Projected orbit of K2-278 b around its host star K2-278)


  • The Star K2-278 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.588 AU ( 237522857.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 2.195 AU ( 328318660.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 3.344 AU ( 500284982.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 4.921 AU ( 736191267.5 km)
  • Radiation at Planetary Boundary of K2-278 b : 2766048.30 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-278)



  • Kopparapu Recent Venus for Star K2-278 distance : 1.554 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-278 distance : 1.968 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-278 distance : 1.900 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-278 distance : 2.082 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-278 distance : 3.412 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-278 distance : 3.599 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-278)



  • Original Kopparapu Recent Venus for Star K2-278 distance : 1.589 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-278 distance : 2.016 AU
  • Original Kopparapu Moist Greenhouse for Star K2-278 distance : 2.103 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-278 distance : 3.475 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-278 distance : 3.613 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-278)



    (Position in Stellar Map of star K2-278 and its Exoplanet K2-278 b)



    (Zoomed position in Stellar Map of star K2-278 and its Exoplanet K2-278 b (zoom level 3))

    (Synthetic Spectrum of star K2-278*)
    *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