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an open source database of all discovered extrasolar planets

HD 189733

The planetary system HD 189733 hosts at least one planet. Note that the system is a multiple star system. It hosts at least 2 stellar components.

  System parameters
Primary system name HD 189733
Alternative system names N/A
Right ascension 20 00 43
Declination +22 42 39
Distance [parsec] 19.30
Distance [lightyears] 62.9
Number of stars in system 2
Number of planets in system 1



This illustration shows HD 189733b, a huge gas giant that orbits very close to its host star HD 189733. The planet's atmosphere is scorching with a temperature of over 1000 degrees Celsius, and it rains glass, sideways, in howling 7000 kilometre-per-hour winds. At a distance of 63 light-years from us, this turbulent alien world is one of the nearest exoplanets to Earth that can be seen crossing the face of its star. By observing this planet before, during, and after it disappeared behind its host star during orbit, astronomers were able to deduce that HD 189733b is a deep, azure blue - reminiscent of Earth's colour as seen from space. Credit: NASA, ESA, M. Kornmesser

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
    •  HD 189733 A, stellar object
      •  HD 189733 A b, planet, semi-major axis: 0.0314 AU
      •  HD 189733 B, stellar object

      PlanetsPlanets in the system

      This table lists all planets in the system HD 189733.

        HD 189733 A b
      Alternative planet names HD 189733 b, V452 Vulpeculae A b
      Description The planet HD 189733 b is a transiting hot Jupiter on a 2 day orbit. Astronomers have observed the secondary eclipse with the Hubble Space Telescope. They found evidence for optically thick reflective clouds on the dayside hemisphere. According to the best-fit albedo values, the planet would appear deep blue at visible wavelengths.
      Lists Confirmed planets; Planets in binary systems, S-type
      Mass [Mjup] 1.138
      Mass [Mearth] 362
      Radius [Rjup] 1.138
      Radius [Rearth] 12.76
      Orbital period [days] 2.22
      Semi-major axis [AU] 0.0314
      Eccentricity 0.0041
      Equilibrium temperature [K] 1100
      Discovery method transit
      Discovery year 2005
      Last updated [yy/mm/dd] 13/08/18

      starStars in the system

      This table lists all stars in the system HD 189733.

        HD 189733 A HD 189733 B
      Alternative star names V452 Vulpeculae A V452 Vulpeculae B
      Mass [MSun] 0.800 0.400
      Radius [RSun] 0.788 N/A
      Age [Gyr] N/A N/A
      Metallicity [Fe/H] -0.0300 N/A
      Temperature [K] 4980 N/A
      Spectral type K2V M4
      Visual magnitude 7.68±0.05 N/A

      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 189733 A 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.

      HD 189733 A 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) 1
      Hanno Rein hanno(at) 9
      Marc-Antoine Martinod marc-antoine.martinod(at) 4
      Ryan Varley ryanjvarley(at) 5

      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.