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an open source database of all discovered extrasolar planets

HD 26965

The planetary system HD 26965 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 HD 26965
Alternative system names 40 Eri, 40 Eridani, omi02 Eri, Omicron-2 Eridani, ο2 Eri, ο2 Eridani
Right ascension 04 15 16.31963
Declination -07 39 10.3404
Distance [parsec] 4.980±0.010
Distance [lightyears] 16.24±0.03
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: 34.5±0.2 AU, 230.1±0.7 years
      •  40 Eri B, stellar object
        •  40 Eri C, stellar object
        •  HD 26965, stellar object
          •  HD 26965 b, planet

        PlanetsPlanets in the system

        This table lists all planets in the system HD 26965.

          HD 26965 b
        Alternative planet names 40 Eridani A b
        Description HD 26965 b is a low-mass exoplanet orbiting the star 40 Eridani A. It was originally discovered by Díaz et al. (2018) and confirmed by the Dharma Planet Search (Ma et al., 2018). The star system also contains a distant binary containing the white dwarf star 40 Eridani B and the flare star 40 Eridani C.
        Lists Confirmed planets; Planets in binary systems, S-type
        Mass [Mjup] 0.0267±0.0015
        Mass [Mearth] 8.5±0.5
        Radius [Rjup] N/A
        Radius [Rearth] N/A
        Orbital period [days] 42.378±0.010
        Semi-major axis [AU] N/A
        Eccentricity 0.04+0.05−0.03
        Equilibrium temperature [K] N/A
        Discovery method RV
        Discovery year 2018
        Last updated [yy/mm/dd] 18/07/20

        starStars in the system

        This table lists all stars in the system HD 26965.

          HD 26965 40 Eri B 40 Eri C
        Alternative star names 40 Eri A, 40 Eridani A, omi02 Eri A, Omicron-2 Eridani A, ο2 Eri A, ο2 Eridani A, Keid, HIP 19849, TYC 5312-2325-1, Gliese 166 A, Gl 166 A, GJ 166 A, HR 1325, LHS 23, BD-07 780, 2MASS J04151651-0739068, WDS J04153-0739 A 40 Eridani B, omi02 Eri B, Omicron-2 Eridani B, ο2 Eri B, ο2 Eridani B, WD 0413-077, Gliese 166 B, Gl 166 B, GJ 166 B, LHS 24, BD-07 781, WDS J04153-0739 B 40 Eridani C, omi02 Eri C, Omicron-2 Eridani C, ο2 Eri C, ο2 Eridani C, DY Eri, DY Eridani, Gliese 166 C, Gl 166 C, GJ 166 C, LHS 25, 2MASS J04152173-0739173, WDS J04153-0739 C
        Mass [MSun] 0.78±0.08 0.575±0.018 0.204±0.006
        Radius [RSun] 0.812±0.017 0.0131±0.0002 N/A
        Age [Gyr] 7±5 1.800 N/A
        Metallicity [Fe/H] -0.42±0.04 N/A -0.21±0.13
        Temperature [K] 5072±53 17200±110 N/A
        Spectral type K0V DA2.9 M4.5V
        Visual magnitude 4.43 9.53 11.17

        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 26965 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 zoneHD 26965 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) 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.