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an open source database of all discovered extrasolar planets

Gliese 221

The planetary system Gliese 221 hosts at least 4 planets.

  System parameters
Primary system name Gliese 221
Alternative system names BD-06 1339, GJ 221
Right ascension 05 53 00.00
Declination -05 59 40.92
Distance [parsec] 20.0±1.0
Distance [lightyears] 65±3
Number of stars in system 1
Number of planets in system 4

ArchitectureArchitecture of the system

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

  •  Gliese 221, stellar object
    •  Gliese 221 b, planet, semi-major axis: 0.0428±0.0007 AU
      •  Gliese 221 c, planet, semi-major axis: 0.435±0.007 AU
        •  Gliese 221 d, planet, semi-major axis: 1.06±0.07 AU
          •  Gliese 221 e, planet, semi-major axis: 0.030±0.003 AU

          PlanetsPlanets in the system

          This table lists all planets in the system Gliese 221.

            Gliese 221 b Gliese 221 c Gliese 221 d Gliese 221 e
          Alternative planet names BD-06 1339 b, GJ 221 b BD-06 1339 c, GJ 221 c BD-06 1339 d, GJ 221 d GJ 221 e, BD-06 1339 e
          Description The parameters listed here were imported into the Open Exoplanet Catalogue from the website.
          Lists Confirmed planets
          Mass [Mjup] 0.027±0.004 0.17±0.03 0.06+0.04−0.03 0.010+0.005−0.004
          Mass [Mearth] 8.6±1.3 54±10 18+12−9 3.3+1.5−1.4
          Radius [Rjup] N/A N/A N/A N/A
          Radius [Rearth] N/A N/A N/A N/A
          Orbital period [days] 3.8728±0.0004 125.9±0.4 487±26 2.3946±0.0004
          Semi-major axis [AU] 0.0428±0.0007 0.435±0.007 1.06±0.07 0.030±0.003
          Eccentricity 0.00 0.31±0.11 0.02+0.24−0.02 0.03+0.24−0.03
          Equilibrium temperature [K] N/A N/A N/A N/A
          Discovery method RV
          Discovery year 2013 2013 2014 2019
          Last updated [yy/mm/dd] 21/04/11

          starStars in the system

          This table lists all stars in the system Gliese 221.

            Gliese 221
          Alternative star names BD-06 1339, GJ 221
          Mass [MSun] 0.700
          Radius [RSun] N/A
          Age [Gyr] N/A
          Metallicity [Fe/H] -0.14±0.17
          Temperature [K] 4324±100
          Spectral type K7V/M0V
          Visual magnitude 6.69

          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).

          PlutoMercuryMarsVenusEarthNeptuneUranusSaturnJupiterGliese 221 bGliese 221 cGliese 221 dGliese 221 e

          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 zoneGliese 221 bGliese 221 cGliese 221 dGliese 221 e

          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) 11
          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.