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an open source database of all discovered extrasolar planets


The planetary system Kepler-117 hosts at least 2 planets.

  System parameters
Primary system name Kepler-117
Alternative system names KOI-209, KIC 10723750
Right ascension 19 15 10.326
Declination +48 02 24.81
Distance [parsec] 1430±50edit
Distance [lightyears] 4664±163
Number of stars in system 1
Number of planets in system 2

ArchitectureArchitecture of the system

This list shows all planetary and stellar components in the system. It gives a quick overview of the hierarchical architecture.

  •  Kepler-117, stellar object
    •  Kepler-117 c, planet, semi-major axis: 0.280+0.009−0.003 AU
      •  Kepler-117 b, planet, semi-major axis: 0.1445+0.0047−0.0014 AU

      PlanetsPlanets in the system

      This table lists all planets in the system Kepler-117.

        Kepler-117 c Kepler-117 b
      Alternative planet names KOI-209 c, KOI-209.01, KIC 10723750 c, KIC 10723750.01, UCAC3 277-144185 c KOI-209 b, KOI-209.02, KIC 10723750 b, KIC 10723750.02, UCAC3 277-144185 b
      Description Kepler-117 c has been discovered by the Kepler spacecraft and is the outermost planet in the system. A new statistical analysis led by a team at NASA Ames Research Center has validated the planet with more than 99 percent confidence.edit Kepler-117 b has been discovered by the Kepler spacecraft and is the innermost planet in the system. A new statistical analysis led by a team at NASA Ames Research Center has validated the planet with more than 99 percent confidence.edit
      Lists Confirmed planets
      Mass [Mjup] 1.84±0.18edit 0.09±0.03edit
      Mass [Mearth] 585±57 30±10
      Radius [Rjup] 1.10±0.04edit 0.72±0.02edit
      Radius [Rearth] 12.3±0.4 8.1±0.3
      Orbital period [days] 50.7904±0.0000edit 18.7959±0.0001edit
      Semi-major axis [AU] 0.280+0.009−0.003edit 0.1445+0.0047−0.0014edit
      Eccentricity 0.032±0.003edit 0.049±0.006edit
      Equilibrium temperature [K] 704±15edit 984±18edit
      Discovery method transit
      Discovery year 2014
      Last updated [yy/mm/dd] 14/11/17

      starStars in the system

      This table lists all stars in the system Kepler-117.

      Alternative star names KOI-209, KIC 10723750, UCAC3 277-144185, 2MASS J19151032+4802248
      Mass [MSun] 1.13+0.13−0.02edit
      Radius [RSun] 1.61±0.05edit
      Age [Gyr] 5.3±1.4edit
      Metallicity [Fe/H] -0.04±0.10edit
      Temperature [K] 6150±110edit
      Spectral type N/A
      Visual magnitude 14.290±0.018edit

      Planet sizes

      The following plot shows the approximate sizes of the planets in this system The Solar System planets are shown as a comparison. Note that unless the radius has been determined through a transit observation, this is only an approximation (see Lissauer et al. 2011b).

      PlutoMercuryMarsVenusEarthNeptuneUranusSaturnJupiterKepler-117 cKepler-117 b

      Habitable zone

      The following plot shows the approximate location of the planets in this system with respect to the habitable zone (green) and the size of the star (red). This is only an estimate, using the star's spectral type and mass. Note that if no green band is shown in the plot, then the planet's orbit is far outside the habitable zone. The equations of Selsis, Kasting et al are used to draw the inner and outer boundaries.

      Kepler-117 cKepler-117 b

      referencesScientific references and contributors

      Links to scientific papers and other data sources


      This table lists all links which are relevant to this particular system. Note that this is just a summary. More references to the scientific publications and comments can be found in the commit messages. To see these, head over the github or click here to directly go to the git blame output of this system. In the left column of the output you can see the commit message corresponding to each parameter. It also lists the date of the last commit and the person making the changes. Within the commit message, you will find a link to the scientific publication where the data is taken from. Note that this is a new feature and not all system parameters might have a reference associated with it yet. Please help making this catalogue better and contribute data or references!

      Open Exoplanet Catalogue contributors

      Contributor E-mail Number of commits
      Andrew Tribick ajtribick(at) 1
      Christian Sturm Sol-d(at) 1
      Hanno Rein hanno(at) 4
      Kevin Knittel kevin.knittel(at) 1
      Ryan Varley ryanjvarley(at) 1

      This table lists all people who have contributed to the Open Exoplanet Catalogue. Please consider contributing! Click here to find out how. You can also view all commits contributing to this file on github.

      xmlData download

      You can download the xml file corresponding to this planetary system, which is part of the Open Exoplanet Catalogue. All information on this page has been directly generated from this XML file. You can also download the entire catalogue over at github. If you prefer to download the dataset as an ASCII tables, you might find the oec_tables repository usefule.


      If you spot an error or if you can contribute additional data to this entry, please send an e-mail to Please include the corrected xml file and a reference to where the new data is coming from, ideally a scientific paper. If you are fluent with git and github, you can also create a pull request or open an issue on the Open Exoplanet Catalogue repository. Please include the reference to the relevant scientific paper in your commit message.