Imaginary Picture of K2-275 b

Display orbital revolution of K2-275 b around the hoststar K2-275
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Exoplanet Name : K2-275 b
Alternate Name : "2MASS J08484077+2027182 b, EPIC 212012119 b, EPIC 212012119.01, WISE J084840.76+202718.0 b"
Status : Confirmed
Radius (Rjup / Re): 0.2000 (Rjup) 2.2418 (Rearth)
Mass (Mjup / Me): 0.0176 (Mjup) 5.5894 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0400 (AU) 0.0400 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0090
Orbital Period(Observed/Estimated) 3.28 (Days Obs.) 3.29 (Days Est.)
Surface Gravity (G Earth) 1.1122
Star Radiation at Atmospheric Boundary: 218994.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 965.5 (K)
Blackbody T 0.3(K) 906.7 (K)
Blackbody T 0.7(K) 733.6 (K)
Tidally Locked Blackbody T 0.1(K) 1148.2 (K)
Tidally Locked Blackbody T 0.3(K) 1078.3 (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 : K2-275
Alternate Name : "2MASS J08484077+2027182, EPIC 212012119, WISE J084840.76+202718.0"
Star Distance(LY) : 404.5
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4812 (K)
Spectral type : K3
UV portion[%]: 2.5
Visible portion[%]: 35.5
IR portion[%]: 62.0
Metalicity : 0.0
Absolute Magnitude: 4.9
Apparent Magnitude: 10.4
Right Ascension(RA) 132.1699
Declination (DEC) 20.4551
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=K2-275+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-275 b
K2-275 b
  • K2-275 b is an exoplanet orbiting the star K2-275, located about 404.5 light-years (124.0 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-275 has apparent magnitude of 10.4, with absolute magnitude of 4.9.
  • It is 0.8 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4812 with its spectral types of K3
  • In this planetary system, the extrasolar planet K2-275 b orbits around the star K2-275 every 3.3 days with its orbital distance of 0.04 AU ( 5983914.8 km)
    • (Projected orbit of K2-275 b around its host star K2-275)


  • The Star K2-275 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.366 AU ( 54781284.3 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.506 AU ( 75722051.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.771 AU ( 115383648.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.135 AU ( 169792093.4 km)
  • Radiation at Planetary Boundary of K2-275 b : 218994.41 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-275)



  • Kopparapu Recent Venus for Star K2-275 distance : 0.400 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-275 distance : 0.506 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-275 distance : 0.489 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-275 distance : 0.536 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-275 distance : 0.924 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-275 distance : 0.975 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-275)



  • Original Kopparapu Recent Venus for Star K2-275 distance : 0.395 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-275 distance : 0.522 AU
  • Original Kopparapu Moist Greenhouse for Star K2-275 distance : 0.522 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-275 distance : 0.939 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-275 distance : 0.977 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-275)



    (Position in Stellar Map of star K2-275 and its Exoplanet K2-275 b)



    (Zoomed position in Stellar Map of star K2-275 and its Exoplanet K2-275 b (zoom level 3))

    (Synthetic Spectrum of star K2-275*)
    *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