Imaginary Picture of Kepler-891 b

Display orbital revolution of Kepler-891 b around the hoststar Kepler-891
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Exoplanet Name : Kepler-891 b
Alternate Name : "2MASS J19242011+4021189 b, K01564.01, KIC 5184584 b, KOI-1564 b, KOI-1564.01, WISE J192420.12+402118.8 b"
Status : Confirmed
Radius (Rjup / Re): 0.5720 (Rjup) 6.4115 (Rearth)
Mass (Mjup / Me): 0.1834 (Mjup) 58.3256 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.2831 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.1463
Orbital Period(Observed/Estimated) 53.45 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.4188
Star Radiation at Atmospheric Boundary: 62809.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 706.6 (K)
Blackbody T 0.3(K) 663.5 (K)
Blackbody T 0.7(K) 536.9 (K)
Tidally Locked Blackbody T 0.1(K) 840.2 (K)
Tidally Locked Blackbody T 0.3(K) 789.1 (K)
Size Class: sub-Jupiter-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-891
Alternate Name : "2MASS J19242011+4021189, KIC 5184584, KOI-1564, WISE J192420.12+402118.8"
Star Distance(LY) : 7702.9
Stellar Radius(Rsun) : 1.8 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 3.5 (GY)
Temperature : 5950 (K)
Spectral type : G1
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : 0.1
Absolute Magnitude: 2.3
Apparent Magnitude: 14.2
Right Ascension(RA) 291.0838
Declination (DEC) 40.3553
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 728 LIKELY FALSE POSITIVES
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-891&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-891%20b/
Kepler-891 b
Kepler-891 b

  • Kepler-891 b is an exoplanet orbiting the star Kepler-891, located about 7702.9 light-years (2361.7 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-891 has apparent magnitude of 14.2, with absolute magnitude of 2.3.
  • It is 1.1 times more massive and 1.8 times bigger compared with our Sun. The surface temperature is 5950 with its spectral types of G1
  • In this planetary system, the extrasolar planet Kepler-891 b orbits around the star Kepler-891 every 53.4 days with its orbital distance of 0.28 AU ( 42357411.3 km)
  • (Projected orbit of Kepler-891 b around its host star Kepler-891)


  • The Star Kepler-891 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.388 AU ( 207668496.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.919 AU ( 287052132.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.924 AU ( 437403925.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 4.303 AU ( 643659037.7 km)
  • Radiation at Planetary Boundary of Kepler-891 b : 62808.99 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-891)



  • Kopparapu Recent Venus for Star Kepler-891 distance : 1.424 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-891 distance : 1.803 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-891 distance : 1.741 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-891 distance : 1.909 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-891 distance : 3.170 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-891 distance : 3.344 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-891)



  • Original Kopparapu Recent Venus for Star Kepler-891 distance : 1.431 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-891 distance : 1.852 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-891 distance : 1.893 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-891 distance : 3.227 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-891 distance : 3.355 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-891)



    (Position in Stellar Map of star Kepler-891 and its Exoplanet Kepler-891 b)



    (Zoomed position in Stellar Map of star Kepler-891 and its Exoplanet Kepler-891 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-891*)
    *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