Imaginary Picture of Kepler-261 b

Display orbital revolution of Kepler-261 b around the hoststar Kepler-261
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Exoplanet Name : Kepler-261 b
Alternate Name : "2MASS J19252754+3736330 b, K00988.01, KIC 2302548 b, KOI-988 b, KOI-988.01, WISE J192527.54+373633.1 b"
Status : Confirmed
Radius (Rjup / Re): 0.1940 (Rjup) 2.1745 (Rearth)
Mass (Mjup / Me): 0.0171 (Mjup) 5.4333 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0880 (AU) 0.0880 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0284
Orbital Period(Observed/Estimated) 10.38 (Days Obs.) 10.22 (Days Est.)
Surface Gravity (G Earth) 1.1490
Star Radiation at Atmospheric Boundary: 61260.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 702.2 (K)
Blackbody T 0.3(K) 659.4 (K)
Blackbody T 0.7(K) 533.5 (K)
Tidally Locked Blackbody T 0.1(K) 835.0 (K)
Tidally Locked Blackbody T 0.3(K) 784.2 (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-261
Alternate Name : "2MASS J19252754+3736330, KIC 2302548, KOI-988, WISE J192527.54+373633.1"
Star Distance(LY) : 1035.2
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5121 (K)
Spectral type : K1
UV portion[%]: 3.9
Visible portion[%]: 38.4
IR portion[%]: 57.7
Metalicity : 0.1
Absolute Magnitude: 4.6
Apparent Magnitude: 12.1
Right Ascension(RA) 291.3648
Declination (DEC) 37.6092
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors 0
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-261+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-261%20b/
Kepler-261 b
Kepler-261 b

  • Kepler-261 b is an exoplanet orbiting the star Kepler-261, located about 1035.2 light-years (317.4 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star Kepler-261 has apparent magnitude of 12.1, with absolute magnitude of 4.6.
  • It is 0.9 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5121 with its spectral types of K1
  • In this planetary system, the extrasolar planet Kepler-261 b orbits around the star Kepler-261 every 10.4 days with its orbital distance of 0.09 AU ( 13164612.6 km)
  • (Projected orbit of Kepler-261 b around its host star Kepler-261)


  • The Star Kepler-261 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.426 AU ( 63742475.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.589 AU ( 88108759.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.897 AU ( 134258250.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.321 AU ( 197566897.7 km)
  • Radiation at Planetary Boundary of Kepler-261 b : 61260.58 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-261)



  • Kopparapu Recent Venus for Star Kepler-261 distance : 0.458 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-261 distance : 0.580 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-261 distance : 0.560 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-261 distance : 0.615 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-261 distance : 1.047 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-261 distance : 1.104 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-261)



  • Original Kopparapu Recent Venus for Star Kepler-261 distance : 0.454 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-261 distance : 0.598 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-261 distance : 0.601 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-261 distance : 1.064 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-261 distance : 1.107 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-261)



    (Position in Stellar Map of star Kepler-261 and its Exoplanet Kepler-261 b)



    (Zoomed position in Stellar Map of star Kepler-261 and its Exoplanet Kepler-261 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-261*)
    *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