Imaginary Picture of K2-174 b

Display orbital revolution of K2-174 b around the hoststar K2-174
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Exoplanet Name : K2-174 b
Alternate Name : "2MASS J04031027+1620509 b, EPIC 210558622 b, EPIC 210558622.01, WISE J040310.30+162050.1 b"
Status : Confirmed
Radius (Rjup / Re): 0.2320 (Rjup) 2.6005 (Rearth)
Mass (Mjup / Me): 0.0289 (Mjup) 9.1884 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1260 (AU) 0.1260 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0536
Orbital Period(Observed/Estimated) 19.56 (Days Obs.) 19.53 (Days Est.)
Surface Gravity (G Earth) 1.3587
Star Radiation at Atmospheric Boundary: 14069.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 486.1 (K)
Blackbody T 0.3(K) 456.5 (K)
Blackbody T 0.7(K) 369.3 (K)
Tidally Locked Blackbody T 0.1(K) 578.1 (K)
Tidally Locked Blackbody T 0.3(K) 542.9 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Theoretical
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-174
Alternate Name : "2MASS J04031027+1620509, EPIC 210558622, WISE J040310.30+162050.1"
Star Distance(LY) : 326.9
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.7 (Msun Measured) 0.7 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4455 (K)
Spectral type : K5
UV portion[%]: 1.4
Visible portion[%]: 30.3
IR portion[%]: 68.2
Metalicity : 0.1
Absolute Magnitude: 5.2
Apparent Magnitude: 10.2
Right Ascension(RA) 60.7928
Declination (DEC) 16.3474
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=K2-174+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-174 b
K2-174 b
  • K2-174 b is an exoplanet orbiting the star K2-174, located about 326.9 light-years (100.2 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-174 has apparent magnitude of 10.2, with absolute magnitude of 5.2.
  • It is 0.7 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4455 with its spectral types of K5
  • In this planetary system, the extrasolar planet K2-174 b orbits around the star K2-174 every 19.6 days with its orbital distance of 0.13 AU ( 18849331.7 km)
    • (Projected orbit of K2-174 b around its host star K2-174)


  • The Star K2-174 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.292 AU ( 43738354.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.404 AU ( 60457836.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.616 AU ( 92124363.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.906 AU ( 135565036.3 km)
  • Radiation at Planetary Boundary of K2-174 b : 14069.30 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-174)



  • Kopparapu Recent Venus for Star K2-174 distance : 0.323 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-174 distance : 0.409 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-174 distance : 0.395 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-174 distance : 0.434 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-174 distance : 0.760 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-174 distance : 0.802 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-174)



  • Original Kopparapu Recent Venus for Star K2-174 distance : 0.319 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-174 distance : 0.423 AU
  • Original Kopparapu Moist Greenhouse for Star K2-174 distance : 0.422 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-174 distance : 0.772 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-174 distance : 0.803 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-174)



    (Position in Stellar Map of star K2-174 and its Exoplanet K2-174 b)



    (Zoomed position in Stellar Map of star K2-174 and its Exoplanet K2-174 b (zoom level 3))

    (Synthetic Spectrum of star K2-174*)
    *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