Imaginary Picture of K2-277 b

Display orbital revolution of K2-277 b around the hoststar K2-277
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Exoplanet Name : K2-277 b
Alternate Name : "2MASS J13280398-1556162 b, EPIC 212357477 b, EPIC 212357477.01, TYC 6121-773-1 b, WISE J132803.91-155616.5 b"
Status : Confirmed
Radius (Rjup / Re): 0.1850 (Rjup) 2.0737 (Rearth)
Mass (Mjup / Me): 0.0164 (Mjup) 5.1985 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0675 (AU) 0.0675 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0173
Orbital Period(Observed/Estimated) 6.33 (Days Obs.) 6.34 (Days Est.)
Surface Gravity (G Earth) 1.2089
Star Radiation at Atmospheric Boundary: 275100.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1022.2 (K)
Blackbody T 0.3(K) 959.9 (K)
Blackbody T 0.7(K) 776.7 (K)
Tidally Locked Blackbody T 0.1(K) 1215.6 (K)
Tidally Locked Blackbody T 0.3(K) 1141.5 (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 : K2-277
Alternate Name : "2MASS J13280398-1556162, EPIC 212357477, TYC 6121-773-1, WISE J132803.91-155616.5"
Star Distance(LY) : 367.2
Stellar Radius(Rsun) : 1.0 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5741 (K)
Spectral type : G3
UV portion[%]: 7.7
Visible portion[%]: 44.6
IR portion[%]: 47.7
Metalicity : 0.1
Absolute Magnitude: 3.8
Apparent Magnitude: 9.1
Right Ascension(RA) 202.0166
Declination (DEC) -15.9378
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=K2-277+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-277 b
K2-277 b

  • K2-277 b is an exoplanet orbiting the star K2-277, located about 367.2 light-years (112.6 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-277 has apparent magnitude of 9.1, with absolute magnitude of 3.8.
  • It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5741 with its spectral types of G3
  • In this planetary system, the extrasolar planet K2-277 b orbits around the star K2-277 every 6.3 days with its orbital distance of 0.07 AU ( 10097856.3 km)
  • (Projected orbit of K2-277 b around its host star K2-277)


  • The Star K2-277 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.693 AU ( 103610779.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.957 AU ( 143217173.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.459 AU ( 218231279.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.147 AU ( 321136887.1 km)
  • Radiation at Planetary Boundary of K2-277 b : 275100.21 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-277)



  • Kopparapu Recent Venus for Star K2-277 distance : 0.719 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-277 distance : 0.911 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-277 distance : 0.880 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-277 distance : 0.965 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-277 distance : 1.610 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-277 distance : 1.699 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-277)



  • Original Kopparapu Recent Venus for Star K2-277 distance : 0.720 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-277 distance : 0.936 AU
  • Original Kopparapu Moist Greenhouse for Star K2-277 distance : 0.952 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-277 distance : 1.639 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-277 distance : 1.704 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-277)



    (Position in Stellar Map of star K2-277 and its Exoplanet K2-277 b)



    (Zoomed position in Stellar Map of star K2-277 and its Exoplanet K2-277 b (zoom level 3))

    (Synthetic Spectrum of star K2-277*)
    *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