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an open source database of all discovered extrasolar planets


The planetary system Kepler-56 hosts at least 3 planets.

  System parameters
Primary system name Kepler-56
Alternative system names KOI-1241, KIC 6448890
Right ascension 19 35 02.01
Declination +41 52 18.7
Distance [parsec] N/A
Distance [lightyears] N/A
Number of stars in system 1
Number of planets in system 3

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-56, stellar object
    •  Kepler-56 b, planet, semi-major axis: 0.103±0.004 AU
      •  Kepler-56 c, planet, semi-major axis: 0.165±0.006 AU
        •  Kepler-56 d, planet, semi-major axis: 2.00 AU

        PlanetsPlanets in the system

        This table lists all planets in the system Kepler-56.

          Kepler-56 b Kepler-56 c Kepler-56 d
        Alternative planet names KOI-1241.02, KOI-1241 b, KIC 6448890 b KOI-1241.01, KOI-1241 c, KIC 6448890 c KOI-1241 d, KIC 6448890 d
        Description This planet candidate was discovered by the Kepler spacecraft. It transits its host star every 10.50 days for 13.5401 hours. Periodic transit timing variations confirm its planetary nature. The orbit is inclined relative to the stellar equator, which is tilted by 47 ± 6 degrees to the line of sight.edit This planet candidate was discovered by the Kepler spacecraft. It transits its host star every 21.41 days for 11.0797 hours. Periodic transit timing variations confirm its planetary nature. The orbit is inclined relative to the stellar equator, which is tilted by 47 ± 6 degrees to the line of sight.edit A linear trend in the radial velocity measurements indicate a third object orbiting Kepler-56, which has tilted the orbits of the inner planets with respect to the stellar equator. So far it has not been possible to confirm the nature of this object from the observations of the system, but it may be a giant planet in a 2 AU orbit.edit
        Lists Confirmed planets Confirmed planets Controversial
        Mass [Mjup] 0.070+0.012−0.011edit 0.57+0.07−0.06edit 3.30edit
        Mass [Mearth] 22±4 181+21−19 1049
        Radius [Rjup] 0.58±0.03edit 0.87±0.04edit N/A
        Radius [Rearth] 6.5±0.3 9.8+0.5−0.4 N/A
        Orbital period [days] 10.5106+0.0011−0.0010edit 21.4024±0.0006edit N/A
        Semi-major axis [AU] 0.103±0.004edit 0.165±0.006edit 2.00edit
        Eccentricity N/A N/A 0.400edit
        Equilibrium temperature [K] N/A N/A N/A
        Discovery method transit transit RV
        Discovery year 2012
        Last updated [yy/mm/dd] 15/04/14

        starStars in the system

        This table lists all stars in the system Kepler-56.

        Alternative star names KOI-1241, KIC 6448890, 2MASS J19350200+4152187
        Mass [MSun] 1.32±0.13edit
        Radius [RSun] 4.22±0.15edit
        Age [Gyr] 3.5±1.3edit
        Metallicity [Fe/H] 0.20±0.16edit
        Temperature [K] 4840±97edit
        Spectral type N/A
        Visual magnitude N/A

        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-56 bKepler-56 cKepler-56 d

        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.

        Habitable zoneKepler-56 bKepler-56 cKepler-56 d

        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) 2
        Hanno Rein hanno(at) 8
        Marc-Antoine Martinod marc-antoine.martinod(at) 2
        Ryan Varley ryanjvarley(at) 4

        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.