Imaginary Picture of Kepler-1261 b

Display orbital revolution of Kepler-1261 b around the hoststar Kepler-1261
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Exoplanet Name : Kepler-1261 b
Alternate Name : "2MASS J19005578+4848241 b, K02497.01, KIC 11179076 b, KOI-2497 b, KOI-2497.01, WISE J190055.77+484823.9 b"
Status : Confirmed
Radius (Rjup / Re): 0.2020 (Rjup) 2.2642 (Rearth)
Mass (Mjup / Me): 0.0177 (Mjup) 5.6414 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.2434 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.1326
Orbital Period(Observed/Estimated) 48.43 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.1004
Star Radiation at Atmospheric Boundary: 6239.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 396.7 (K)
Blackbody T 0.3(K) 372.5 (K)
Blackbody T 0.7(K) 301.4 (K)
Tidally Locked Blackbody T 0.1(K) 471.7 (K)
Tidally Locked Blackbody T 0.3(K) 443.0 (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-1261
Alternate Name : "2MASS J19005578+4848241, KIC 11179076, KOI-2497, WISE J190055.77+484823.9"
Star Distance(LY) : 2427.5
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 4.5 (GY)
Temperature : 4880 (K)
Spectral type : K2
UV portion[%]: 2.7
Visible portion[%]: 36.0
IR portion[%]: 61.3
Metalicity : 0.0
Absolute Magnitude: 4.8
Apparent Magnitude: 14.1
Right Ascension(RA) 285.2324
Declination (DEC) 48.8067
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Timothy D. Morton1, Stephen T. Bryson2, Jeffrey L. Coughlin2,3, Jason F. Rowe4, Ganesh Ravichandran5, Erik A. Petigura6,7, Michael R. Haas2, and Natalie M. Batalha8"
Discovery Paper - Title FALSE POSITIVE PROBABILITIES FOR ALL KEPLER OBJECTS OF INTEREST: 1284 NEWLY VALIDATED PLANETS AND 442 LIKELY FALSE POSITIVES
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-1261+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-1261%20b/
Kepler-1261 b
Kepler-1261 b

  • Kepler-1261 b is an exoplanet orbiting the star Kepler-1261, located about 2427.5 light-years (744.3 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-1261 has apparent magnitude of 14.1, with absolute magnitude of 4.8.
  • It is 0.8 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4880 with its spectral types of K2
  • In this planetary system, the extrasolar planet Kepler-1261 b orbits around the star Kepler-1261 every 48.4 days with its orbital distance of 0.24 AU ( 36409795.0 km)
  • (Projected orbit of Kepler-1261 b around its host star Kepler-1261)


  • The Star Kepler-1261 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.376 AU ( 56263310.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.520 AU ( 77770598.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.792 AU ( 118505182.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.166 AU ( 174385567.0 km)
  • Radiation at Planetary Boundary of Kepler-1261 b : 6239.55 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1261)



  • Kopparapu Recent Venus for Star Kepler-1261 distance : 0.409 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-1261 distance : 0.518 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1261 distance : 0.500 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-1261 distance : 0.549 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1261 distance : 0.943 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-1261 distance : 0.995 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1261)



  • Original Kopparapu Recent Venus for Star Kepler-1261 distance : 0.404 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1261 distance : 0.534 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1261 distance : 0.535 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1261 distance : 0.959 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1261 distance : 0.997 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1261)



    (Position in Stellar Map of star Kepler-1261 and its Exoplanet Kepler-1261 b)



    (Zoomed position in Stellar Map of star Kepler-1261 and its Exoplanet Kepler-1261 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-1261*)
    *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