Imaginary Picture of K2-84 c

Display orbital revolution of K2-84 c around the hoststar K2-84
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Exoplanet Name : K2-84 c
Alternate Name : EPIC 210577548.02
Status : Confirmed
Radius (Rjup / Re): 0.1810 (Rjup) 2.0288 (Rearth)
Mass (Mjup / Me): 0.0160 (Mjup) 5.0939 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1768 (AU) 0.1768 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0763
Orbital Period(Observed/Estimated) 27.86 (Days Obs.) 27.86 (Days Est.)
Surface Gravity (G Earth) 1.2375
Star Radiation at Atmospheric Boundary: 34627.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 608.8 (K)
Blackbody T 0.3(K) 571.8 (K)
Blackbody T 0.7(K) 462.6 (K)
Tidally Locked Blackbody T 0.1(K) 724.0 (K)
Tidally Locked Blackbody T 0.3(K) 679.9 (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 : K2-84
Alternate Name : "2MASS J03431422+1638044, EPIC 210577548, WISE J034314.24+163804.1"
Star Distance(LY) : 939.1
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5652 (K)
Spectral type : G5
UV portion[%]: 7.4
Visible portion[%]: 44.2
IR portion[%]: 48.4
Metalicity : 0.0
Absolute Magnitude: 4.3
Apparent Magnitude: 11.6
Right Ascension(RA) 55.8093
Declination (DEC) 16.6345
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=K2-84+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-84 c
K2-84 c

  • K2-84 c is an exoplanet orbiting the star K2-84, located about 939.1 light-years (287.9 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star K2-84 has apparent magnitude of 11.6, with absolute magnitude of 4.3.
  • It is 0.9 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5652 with its spectral types of G5
  • In this planetary system, the extrasolar planet K2-84 c orbits around the star K2-84 every 27.9 days with its orbital distance of 0.18 AU ( 26448903.5 km)
  • (Projected orbit of K2-84 c around its host star K2-84)


  • The Star K2-84 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.644 AU ( 96282058.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.890 AU ( 133086966.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.356 AU ( 202795084.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.995 AU ( 298421851.3 km)
  • Radiation at Planetary Boundary of K2-84 c : 34626.99 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-84)



  • Kopparapu Recent Venus for Star K2-84 distance : 0.672 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-84 distance : 0.851 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-84 distance : 0.822 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-84 distance : 0.901 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-84 distance : 1.508 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-84 distance : 1.591 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-84)



  • Original Kopparapu Recent Venus for Star K2-84 distance : 0.671 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-84 distance : 0.875 AU
  • Original Kopparapu Moist Greenhouse for Star K2-84 distance : 0.888 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-84 distance : 1.535 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-84 distance : 1.596 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-84)



    (Position in Stellar Map of star K2-84 and its Exoplanet K2-84 c)



    (Zoomed position in Stellar Map of star K2-84 and its Exoplanet K2-84 c (zoom level 3))

    (Synthetic Spectrum of star K2-84*)
    *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