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an open source database of all discovered extrasolar planets

HD 131399

The planetary system HD 131399 hosts at least one planet. Note that the system is a multiple star system. It hosts at least 4 stellar components.

  System parameters
Primary system name HD 131399
Alternative system names N/A
Right ascension 14 54 25.30919
Declination -34 08 34.0412
Distance [parsec] 98±7
Distance [lightyears] 320±22
Number of stars in system 4
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, semi-major axis: 349±28 AU, 3556±36 years
    •  Stellar binary, semi-major axis: 0.1199 AU, 9.9286±0.0000 days
      •  HD 131399 Aa1, stellar object
        •  HD 131399 Aa2, stellar object
          •  HD 131399 Ab, circumbinary planet, P-type, semi-major axis: 80±25 AU
          •  Stellar binary
            •  HD 131399 B, stellar object
              •  HD 131399 C, stellar object

            PlanetsPlanets in the system

            This table lists all planets in the system HD 131399.

              HD 131399 Ab
            Alternative planet names N/A
            Description The semi-major axis of this planet is closer relative to that of the outer binary of the hierarchical star system than for any known exoplanet within a stellar multiple, making HD 131399 dynamically unlike any other known system. Subsequent analysis by Nielsen et al. (2017) indicates that this object is a background star.
            Lists Controversial; Planets in binary systems, P-type
            Mass [Mjup] 4.0±1.0
            Mass [Mearth] 1271±318
            Radius [Rjup] N/A
            Radius [Rearth] N/A
            Orbital period [days] ( 2.0±0.5 )·105
            Semi-major axis [AU] 80±25
            Eccentricity 0.3±0.2
            Equilibrium temperature [K] 850±50
            Discovery method imaging
            Discovery year 2016
            Last updated [yy/mm/dd] 17/12/09

            starStars in the system

            This table lists all stars in the system HD 131399.

              HD 131399 Aa1 HD 131399 Aa2 HD 131399 B HD 131399 C
            Alternative star names N/A N/A WDS J14544-3409 Ba WDS J14544-3409 Bb
            Mass [MSun] 1.820 0.510 0.960 0.600
            Radius [RSun] N/A N/A N/A N/A
            Age [Gyr] N/A N/A N/A N/A
            Metallicity [Fe/H] N/A N/A N/A N/A
            Temperature [K] 9300 N/A 5700 4400
            Spectral type A1V N/A G K
            Visual magnitude N/A 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).

            PlutoMercuryMarsVenusEarthNeptuneUranusSaturnJupiterHD 131399 Ab

            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) 5

            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.