Fork me on GitHub
an open source database of all discovered extrasolar planets


The planetary system KOI-2939 hosts at least one planet. Note that the system is a multiple star system. It hosts at least 3 stellar components.

  System parameters
Primary system name KOI-2939
Alternative system names KIC 5473556, Kepler-1647, Kepler-1647 (AB)
Right ascension 19 52 36.021
Declination +40 39 22.23
Distance [parsec] N/A
Distance [lightyears] N/A
Number of stars in system 3
Number of planets in system 1

ArchitectureArchitecture of the system

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

  •  Stellar binary
    •  Stellar binary, semi-major axis: 0.1276±0.0002 AU, 0.0308±0.0000 years
      •  KOI-2939 A, stellar object
        •  KOI-2939 B, stellar object
          •  KOI-2939 b, circumbinary planet, P-type, semi-major axis: 2.720±0.007 AU
          •  KOI-2939 C, stellar object

          PlanetsPlanets in the system

          This table lists all planets in the system KOI-2939.

            KOI-2939 b
          Alternative planet names KOI-2939 (AB) b, KIC 5473556 b, KIC 5473556 (AB) b, Kepler-1647 b, Kepler-1647 (AB) b
          Description KOI-2939 b is a large planet orbiting an 11-day eclipsing binary star. Despite the long orbital period, its orbit lies within the habitable zone of the binary star.
          Lists Confirmed planets; Planets in binary systems, P-type
          Mass [Mjup] 1.5±0.6
          Mass [Mearth] 483±206
          Radius [Rjup] 1.059±0.012
          Radius [Rearth] 11.87±0.14
          Orbital period [days] 1107.59±0.02
          Semi-major axis [AU] 2.720±0.007
          Eccentricity 0.06±0.07
          Equilibrium temperature [K] N/A
          Discovery method transit
          Discovery year 2015
          Last updated [yy/mm/dd] 18/02/17

          starStars in the system

          This table lists all stars in the system KOI-2939.

            KOI-2939 A KOI-2939 B KOI-2939 C
          Alternative star names KIC 5473556 A, 2MASS J19523602+4039222 A, Kepler-1647 A KOI-2939.01, KIC 5473556 B, 2MASS J19523602+4039222 B, Kepler-1647 B KIC 5473556 C, Kepler-1647 C
          Mass [MSun] 1.221±0.011 0.968±0.004 N/A
          Radius [RSun] 1.790±0.005 0.966±0.006 N/A
          Age [Gyr] 4.4±0.2 4.4±0.2 N/A
          Metallicity [Fe/H] -0.14±0.05 N/A N/A
          Temperature [K] 6210±100 5770±125 N/A
          Spectral type F G N/A
          Visual magnitude N/A N/A 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).

          PlutoMercuryMarsVenusEarthNeptuneUranusSaturnJupiterKOI-2939 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) 4
          Hanno Rein hanno(at) 2

          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 useful.


          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.