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an open source database of all discovered extrasolar planets


The planetary system WASP-47 hosts at least 4 planets.

  System parameters
Primary system name WASP-47
Alternative system names K2-23, EPIC 206103150
Right ascension 22 04 48.731
Declination -12 01 07.99
Distance [parsec] 200±30edit
Distance [lightyears] 652±98
Number of stars in system 1
Number of planets in system 4

ArchitectureArchitecture of the system

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

  •  WASP-47, stellar object
    •  WASP-47 b, planet, semi-major axis: 0.0510±0.0010 AU
      •  WASP-47 e, planet, semi-major axis: 0.0170 AU
        •  WASP-47 d, planet, semi-major axis: 0.0880 AU
          •  WASP-47 c, planet, semi-major axis: 1.36±0.04 AU

          PlanetsPlanets in the system

          This table lists all planets in the system WASP-47.

            WASP-47 b WASP-47 e WASP-47 d WASP-47 c
          Alternative planet names 2MASS J22044873-1201079 b, K2-23 b, EPIC 206103150 b 2MASS J22044873-1201079 e, K2-23 e, EPIC 206103150 e 2MASS J22044873-1201079 d, K2-23 d, EPIC 206103150 d 2MASS J22044873-1201079 c, K2-23 c, EPIC 206103150 c
          Description This hot Jupiter planet was announced at the Extreme Solar Systems II conference in Jackson Hole by the WASP team. The K2 mission discovered two additional transiting planets in 2015, and an outer giant planet was discovered by radial velocity measurements.edit This super-Earth planet was discovered by the K2 mission which measured transit timing variations at the inner hot Jupiter. Radial velocity measurements indicate this is a rocky planet.edit This Neptune-sized outer planet was discovered by the K2 mission which measured transit timing variations at the inner hot Jupiter.edit WASP-47c was discovered from radial velocity follow-up of the WASP-47 system.edit
          Lists Confirmed planets
          Mass [Mjup] 1.16±0.09edit 0.038±0.012edit 0.03±0.03edit 1.2±0.2edit
          Mass [Mearth] 370±29 12±4 10±8 394±70
          Radius [Rjup] 1.14±0.04edit 0.163±0.006edit 0.324±0.012edit N/A
          Radius [Rearth] 12.8±0.4 1.83±0.07 3.63±0.13 N/A
          Orbital period [days] 4.1591±0.0000edit 0.7896±0.0000edit 9.0308±0.0002edit 572±7edit
          Semi-major axis [AU] 0.0510±0.0010edit 0.0170edit 0.0880edit 1.36±0.04edit
          Eccentricity < 0.0260edit N/A N/A 0.13±0.10edit
          Equilibrium temperature [K] N/A N/A N/A N/A
          Discovery method transit transit transit RV
          Discovery year 2011 2015 2015 2015
          Last updated [yy/mm/dd] 15/10/17

          starStars in the system

          This table lists all stars in the system WASP-47.

          Alternative star names 2MASS J22044873-1201079, K2-23, EPIC 206103150
          Mass [MSun] 1.03±0.08edit
          Radius [RSun] 1.15±0.04edit
          Age [Gyr] N/A
          Metallicity [Fe/H] 0.36±0.05edit
          Temperature [K] 5576±67edit
          Spectral type G9V
          Visual magnitude 11.90edit

          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).

          PlutoMercuryMarsVenusEarthNeptuneUranusSaturnJupiterWASP-47 bWASP-47 eWASP-47 dWASP-47 c

          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 zoneWASP-47 bWASP-47 eWASP-47 dWASP-47 c

          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) 6
          Christian Sturm Sol-d(at) 1
          Hanno Rein hanno(at) 4
          Marc-Antoine Martinod marc-antoine.martinod(at) 2
          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.