Imaginary Picture of Kepler-998 b

Display orbital revolution of Kepler-998 b around the hoststar Kepler-998
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Exoplanet Name : Kepler-998 b
Alternate Name : "2MASS J19470099+4912314 b, K01885.01, KIC 11413812 b, KOI-1885 b, KOI-1885.01, WISE J194700.99+491231.3 b"
Status : Confirmed
Radius (Rjup / Re): 0.2070 (Rjup) 2.3203 (Rearth)
Mass (Mjup / Me): 0.0182 (Mjup) 5.7712 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0645 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0155
Orbital Period(Observed/Estimated) 5.65 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.0720
Star Radiation at Atmospheric Boundary: 527468.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1202.8 (K)
Blackbody T 0.3(K) 1129.6 (K)
Blackbody T 0.7(K) 913.9 (K)
Tidally Locked Blackbody T 0.1(K) 1430.4 (K)
Tidally Locked Blackbody T 0.3(K) 1343.3 (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 : Kepler-998
Alternate Name : "2MASS J19470099+4912314, KIC 11413812, KOI-1885, WISE J194700.99+491231.3"
Star Distance(LY) : 3215.4
Stellar Radius(Rsun) : 1.2 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 3.3 (GY)
Temperature : 5990 (K)
Spectral type : G0
UV portion[%]: 0.3
Visible portion[%]: 1.5
IR portion[%]: 98.2
Metalicity : 0.1
Absolute Magnitude: 3.3
Apparent Magnitude: 13.2
Right Ascension(RA) 296.7542
Declination (DEC) 49.2087
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Timothy D. Morton, Stephen T. Bryson, Jeffrey L. Coughlin, Jason F. Rowe, Ganesh Ravichandran, Erik A. Petigura, Michael R. Haas, and Natalie M. Batalha"
Discovery Paper - Title FALSE POSITIVE PROBABILITIES FOR ALL KEPLER OBJECTS OF INTEREST: 1284 NEWLY VALIDATED PLANETS AND 805 LIKELY FALSE POSITIVES
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-998&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-998%20b/
Kepler-998 b
Kepler-998 b

  • Kepler-998 b is an exoplanet orbiting the star Kepler-998, located about 3215.4 light-years (985.8 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-998 has apparent magnitude of 13.2, with absolute magnitude of 3.3.
  • It is 1.1 times more massive and 1.2 times bigger compared with our Sun. The surface temperature is 5990 with its spectral types of G0
  • In this planetary system, the extrasolar planet Kepler-998 b orbits around the star Kepler-998 every 5.7 days with its orbital distance of 0.06 AU ( 9649328.0 km)
  • (Projected orbit of Kepler-998 b around its host star Kepler-998)


  • The Star Kepler-998 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.916 AU ( 137096245.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.267 AU ( 189502839.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.930 AU ( 288760390.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.840 AU ( 424923563.8 km)
  • Radiation at Planetary Boundary of Kepler-998 b : 527468.34 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-998)



  • Kopparapu Recent Venus for Star Kepler-998 distance : 0.938 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-998 distance : 1.188 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-998 distance : 1.147 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-998 distance : 1.257 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-998 distance : 2.086 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-998 distance : 2.200 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-998)



  • Original Kopparapu Recent Venus for Star Kepler-998 distance : 0.943 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-998 distance : 1.219 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-998 distance : 1.248 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-998 distance : 2.123 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-998 distance : 2.208 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-998)



    (Position in Stellar Map of star Kepler-998 and its Exoplanet Kepler-998 b)



    (Zoomed position in Stellar Map of star Kepler-998 and its Exoplanet Kepler-998 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-998*)
    *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