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an open source database of all discovered extrasolar planets

HD 20794

The planetary system HD 20794 hosts at least 4 planets.

  System parameters
Primary system name HD 20794
Alternative system names HIP 15510
Right ascension 03 19 55.6509
Declination -43 04 11.2174
Distance [parsec] 6.000±0.010
Distance [lightyears] 19.57±0.03
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.

  •  HD 20794, stellar object
    •  HD 20794 b, planet, semi-major axis: 0.121±0.002 AU
      •  HD 20794 c, planet, semi-major axis: 0.204±0.003 AU
        •  HD 20794 d, planet, semi-major axis: 0.350±0.006 AU
          •  HD 20794 e, planet, semi-major axis: 0.509±0.006 AU

          PlanetsPlanets in the system

          This table lists all planets in the system HD 20794.

            HD 20794 b HD 20794 c HD 20794 d HD 20794 e
          Alternative planet names HIP 15510 b, Gaia DR2 4847957293277762560 b, TYC 7567-1183-1 b, GJ 139 b HIP 15510 c HIP 15510 d HIP 15510 e
          Description This planet was discovered by Pepe et al. 2011. This was a ground based discovery. The parameters listed here are those reported by Pepe et al. 2011 and were imported into the Open Exoplanet Catalogue from the NASA Exoplanet Archive. This planet was discovered by Pepe et al. 2011. This was a ground based discovery. The parameters listed here are those reported by Pepe et al. 2011 and were imported into the Open Exoplanet Catalogue from the NASA Exoplanet Archive. This planet was discovered by Pepe et al. 2011. This was a ground based discovery. The parameters listed here are those reported by Pepe et al. 2011 and were imported into the Open Exoplanet Catalogue from the NASA Exoplanet Archive. This planet was discovered by Feng et al. 2017. This was a ground based discovery. The parameters listed here are those reported by Feng et al. 2017 and were imported into the Open Exoplanet Catalogue from the NASA Exoplanet Archive.
          Lists Confirmed planets
          Mass [Mjup] 0.0085±0.0009 0.0076±0.0013 0.0151±0.0019 0.015±0.003
          Mass [Mearth] 2.7±0.3 2.4±0.4 4.8±0.6 4.8+1.0−0.9
          Radius [Rjup] N/A N/A N/A N/A
          Radius [Rearth] N/A N/A N/A N/A
          Orbital period [days] 18.315±0.008 40.11±0.05 90.31±0.18 147.0+1.4−0.9
          Semi-major axis [AU] 0.121±0.002 0.204±0.003 0.350±0.006 0.509±0.006
          Eccentricity 0.00 0.00 0.00 0.29+0.14−0.18
          Equilibrium temperature [K] 660 508 388 N/A
          Discovery method RV
          Discovery year 2011 2011 2011 2017
          Last updated [yy/mm/dd] 15/08/27 15/08/27 15/08/27 17/06/08

          starStars in the system

          This table lists all stars in the system HD 20794.

            HD 20794
          Alternative star names HIP 15510, Gaia DR2 4847957293277762560, TYC 7567-1183-1, GJ 139
          Mass [MSun] 0.700
          Radius [RSun] N/A
          Age [Gyr] N/A
          Metallicity [Fe/H] -0.400±0.010
          Temperature [K] 5401±17
          Spectral type G8V
          Visual magnitude 4.27

          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 20794 bHD 20794 cHD 20794 dHD 20794 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 zoneHD 20794 bHD 20794 cHD 20794 dHD 20794 e

          referencesScientific references and contributors

          Links to scientific papers and other data sources

          history http://phl.upr.edu/projects/habitable-exoplanets-catalog/data/database
          history http://simbad.u-strasbg.fr/simbad
          history http://simbad.u-strasbg.fr/simbad/

          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)hanno-rein.de 9
          Marc-Antoine Martinod marc-antoine.martinod(at)ens-cachan.fr 1
          Ryan Varley ryanjvarley(at)gmail.com 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.

          correctionsCorrections

          If you spot an error or if you can contribute additional data to this entry, please send an e-mail to exoplanet@hanno-rein.de. 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.