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Epsilon Indi

The planetary system Epsilon Indi 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 Epsilon Indi
Alternative system names eps Ind
Right ascension 22 03 21.6542294981
Declination -56 47 09.537018193
Distance [parsec] 3.639±0.003
Distance [lightyears] 11.869±0.011
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: 2.61±0.03 AU, 11.40±0.12 years
      •  Epsilon Indi Ba, stellar object
        •  Epsilon Indi Bb, stellar object
        •  Epsilon Indi A, stellar object
          •  Epsilon Indi A b, planet, semi-major axis: 12.8+4.2−0.7 AU

        PlanetsPlanets in the system

        This table lists all planets in the system Epsilon Indi.

          Epsilon Indi A b
        Alternative planet names eps Ind A b, ε Ind A b, ε Indi A b
        Description Epsilon Indi Ab is a giant planet in a wide orbit around the nearby star Epsilon Indi A. The orbit has a low eccentricity.
        Lists Confirmed planets; Planets in binary systems, S-type
        Mass [Mjup] 2.7+2.2−0.4
        Mass [Mearth] 861+696−140
        Radius [Rjup] N/A
        Radius [Rearth] N/A
        Orbital period [days] 19206+10111−1502
        Semi-major axis [AU] 12.8+4.2−0.7
        Eccentricity 0.010+0.120−0.010
        Equilibrium temperature [K] N/A
        Discovery method RV
        Discovery year 2018
        Last updated [yy/mm/dd] 18/03/24

        starStars in the system

        This table lists all stars in the system Epsilon Indi.

          Epsilon Indi A Epsilon Indi Ba Epsilon Indi Bb
        Alternative star names eps Ind A, eps Indi A, ε Ind A, ε Indi A, HR 8387, HD 209100, HIP 108870, TYC 8817-984-1, Gaia DR2 6412595290592307840, CD-57 8464, CPD-57 10015, GJ 845 A, Gliese 845 A, SAO 247287, LHS 67, 2MASS J22032156-5647093, WDS J22034-5647 A eps Ind Ba, eps Indi Ba, ε Ind Ba, ε Indi Ba, GJ 845 Ba, CI Indi A, CI Ind A, WDS J22034-5647 Ba eps Ind Bb, eps Indi Bb, ε Ind Bb, ε Indi Bb, GJ 845 Bb, Gliese 845 Bb, CI Indi B, CI Ind B, WDS J22034-5647 Bb
        Mass [MSun] 0.76±0.04 0.0716±0.0008 0.0669±0.0006
        Radius [RSun] 0.732±0.006 > 0.0800 > 0.0820
        Age [Gyr] N/A > 3.7000 > 3.7000
        Metallicity [Fe/H] -0.0600 -0.200 -0.200
        Temperature [K] 4568±59 > 1300.0000 > 880.0000
        Spectral type K5V T1V T6V
        Visual magnitude 4.69 24.12±0.03 > 26.6000

        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).

        PlutoMercuryMarsVenusEarthNeptuneUranusSaturnJupiterEpsilon Indi A b

        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 zoneEpsilon Indi A 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) 3
        Hanno Rein hanno(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 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.