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an open source database of all discovered extrasolar planets

PSR B1620-26

The planetary system PSR B1620-26 hosts at least one planet. Note that the system is a multiple star system. It hosts at least 2 stellar components.

  System parameters
Primary system name PSR B1620-26
Alternative system names B1620-26
Right ascension 16 23 38.2218
Declination -26 31 53.769
Distance [parsec] 1800±200
Distance [lightyears] 5871±652
Number of stars in system 2
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, 191.4428±0.0000 days
    •  PSR B1620-26, stellar object
      •  WD J1623-266, stellar object
        •  PSR B1620-26 b, circumbinary planet, P-type, semi-major axis: 20.0 AU

        PlanetsPlanets in the system

        This table lists all planets in the system PSR B1620-26.

          PSR B1620-26 b
        Alternative planet names B1620-26 b, PSR B1620-26 (AB) b, B1620-26 (AB) b
        Description PSR B1620-26 b is a circum-binary planet. It is orbiting a pulsar and a white dwarf in the globular cluster M4. The cluster is estimated to be 12.2 billion years old.
        Lists Confirmed planets; Planets in binary systems, P-type; Planets in globular clusters
        Mass [Mjup] 1.700
        Mass [Mearth] 540
        Radius [Rjup] N/A
        Radius [Rearth] N/A
        Orbital period [days] 24837
        Semi-major axis [AU] 20.0
        Eccentricity 0.1300
        Equilibrium temperature [K] N/A
        Discovery method timing
        Discovery year 1994
        Last updated [yy/mm/dd] 16/04/12

        starStars in the system

        This table lists all stars in the system PSR B1620-26.

          PSR B1620-26 WD J1623-266
        Alternative star names PSR B1620-26 A, B1620-26 A PSR B1620-26 B, B1620-26 B
        Mass [MSun] 1.350 0.34±0.04
        Radius [RSun] 1.400 ·10-5 N/A
        Age [Gyr] N/A N/A
        Metallicity [Fe/H] N/A N/A
        Temperature [K] N/A N/A
        Spectral type Pulsar D
        Visual magnitude 24.0 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).

        PlutoMercuryMarsVenusEarthNeptuneUranusSaturnJupiterPSR B1620-26 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) 2
        Hanno Rein hanno(at) 7

        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.