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an open source database of all discovered extrasolar planets

HD 128311

The planetary system HD 128311 hosts at least 2 planets.

  System parameters
Primary system name HD 128311
Alternative system names N/A
Right ascension 14 36 00.5607
Declination +09 44 47.4536
Distance [parsec] 16.60
Distance [lightyears] 54.1
Number of stars in system 1
Number of planets in system 2

ArchitectureArchitecture of the system

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

  •  HD 128311, stellar object
    •  HD 128311 b, planet
      •  HD 128311 c, planet

      PlanetsPlanets in the system

      This table lists all planets in the system HD 128311.

        HD 128311 b HD 128311 c
      Alternative planet names TYC 910-165-1 b, Gaia DR2 1176209886733406592 b, HIP 71395 b, GJ 3860 b TYC 910-165-1 c, Gaia DR2 1176209886733406592 c, HIP 71395 c, GJ 3860 c
      Description This planetary system is most likely in a 2:1 mean motion resonance. The inner planet orbits the star exactly twice during one orbit of the outer planet. This is a very stable configuration. Mean motion resonances help us to understand the formation of multiplanteray systems. The existense of this resonance is a strong indication that interactions with the protoplanetary disk migrated the planets to their current positions. A detailed analysis of the HD 128311 system shows that there also had to be non-adiabatic effects during the migration phase such as a third planet (Sandor and Kley 2006) or turbulence in the protoplanetary disk (Rein and Papaloizou 2009).
      Lists Confirmed planets
      Mass [Mjup] 1.83+0.15−0.18 3.20±0.08
      Mass [Mearth] 582+48−57 1017±25
      Radius [Rjup] N/A N/A
      Radius [Rearth] N/A N/A
      Orbital period [days] 460±4 911+8−6
      Semi-major axis [AU] N/A N/A
      Eccentricity 0.30+0.03−0.04 0.12+0.08−0.06
      Equilibrium temperature [K] 177.7 140.7
      Discovery method RV
      Discovery year 2002 2005
      Last updated [yy/mm/dd] 15/01/08

      starStars in the system

      This table lists all stars in the system HD 128311.

        HD 128311
      Alternative star names TYC 910-165-1, Gaia DR2 1176209886733406592, HIP 71395, GJ 3860
      Mass [MSun] 0.828
      Radius [RSun] 0.730
      Age [Gyr] N/A
      Metallicity [Fe/H] 0.0800
      Temperature [K] 4965
      Spectral type K0V
      Visual magnitude 7.51

      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 128311 bHD 128311 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 zoneHD 128311 bHD 128311 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
      Hanno Rein hanno(at) 7
      Marc-Antoine Martinod marc-antoine.martinod(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.