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an open source database of all discovered extrasolar planets

HD 39091

The planetary system HD 39091 hosts at least 2 planets.

  System parameters
Primary system name HD 39091
Alternative system names N/A
Right ascension 05 37 09.8851202601
Declination -80 28 08.831347245
Distance [parsec] 18.27±0.02
Distance [lightyears] 59.59±0.07
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 39091, stellar object
    •  HD 39091 b, planet, semi-major axis: 3.10±0.02 AU
      •  π Mensae c, planet, semi-major axis: 0.0684±0.0005 AU

      PlanetsPlanets in the system

      This table lists all planets in the system HD 39091.

        HD 39091 b π Mensae c
      Alternative planet names π Mensae b, π Men b, Pi Mensae b, Pi Men b, TOI 144 b, GJ 9189 b, Gaia DR2 4623036865373793408 b, HIP 26394 b, TYC 9386-2614-1 b π Men c, Pi Mensae c, Pi Men c, HD 39091 c, TOI 144.01, TOI 144 c
      Description HD 39091 b is a massive giant planet in a high-eccentricity orbit around the G-type star π Mensae. The planet π Men c was the first planet to be announced from the TESS mission. The mass was confirmed with radial velocity data from HARPS and AAT/UCLES.
      Lists Confirmed planets
      Mass [Mjup] 10.02±0.15 0.015±0.003
      Mass [Mearth] 3185±48 4.8+0.8−0.9
      Radius [Rjup] N/A 0.191±0.004
      Radius [Rearth] N/A 2.14±0.04
      Orbital period [days] 2093.1±1.7 6.2682±0.0002
      Semi-major axis [AU] 3.10±0.02 0.0684±0.0005
      Eccentricity 0.637±0.002 0.00
      Equilibrium temperature [K] N/A N/A
      Discovery method RV transit
      Discovery year 2001 2018
      Last updated [yy/mm/dd] 18/09/18

      starStars in the system

      This table lists all stars in the system HD 39091.

        HD 39091
      Alternative star names π Mensae, π Men, Pi Men, Pi Mensae, HIP 26394, TYC 9386-2614-1, Gaia DR1 4623036826718164480, Gaia DR2 4623036865373793408, GJ 9189, HR 2022, CD-80 195, CPD-80 161, SAO 258421, TIC 261136679, TOI 144, 2MASS J05370988-8028090
      Mass [MSun] 1.09±0.04
      Radius [RSun] 1.10±0.02
      Age [Gyr] 3.0+1.4−1.3
      Metallicity [Fe/H] 0.08±0.03
      Temperature [K] 6037±45
      Spectral type G0V
      Visual magnitude 5.67

      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 39091 bπ Mensae 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 39091 bπ Mensae 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
      Andrew Tribick ajtribick(at) 2
      Hanno Rein hanno(at) 6
      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.