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an open source database of all discovered extrasolar planets


The planetary system Kepler-91 hosts at least 2 planets.

  System parameters
Primary system name Kepler-91
Alternative system names KIC 8219268, KOI-2133
Right ascension 19 02 41.4979
Declination +44 07 00.2397
Distance [parsec] 1030+150−130
Distance [lightyears] 3359+489−424
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.

  •  Kepler-91, stellar object
    •  Kepler-91 b, planet, semi-major axis: 0.0726 AU
      •  Kepler-91 b Trojan, planet, semi-major axis: 0.0726 AU

      PlanetsPlanets in the system

      This table lists all planets in the system Kepler-91.

        Kepler-91 b Kepler-91 b Trojan
      Alternative planet names KIC 8219268 b, KOI-2133.01, KOI-2133 b, Gaia DR2 2105909326647414400 b N/A
      Description Kepler-91 b is a planet very close its host star. It might be destroyed within the next 55 million years. The planet was initially discovered by the Kepler telescope and later confirmed by a group of European researchers led by Jorge Lillo-Box. The radial velocities of the star show a linear trend after fitting the variations due to the planet. A possible Trojan companion to Kepler-91b was identified by Placek et al. (2015). This companion was rejected based on unphysically high brightness temperatures inferred by the model, but Knuth et al. (2017) indicated that the analysis was not taking reflected light fully into account.
      Lists Confirmed planets Controversial
      Mass [Mjup] 0.66±0.06 0.025±0.019
      Mass [Mearth] 210±19 8±6
      Radius [Rjup] 1.40±0.04 0.26±0.06
      Radius [Rearth] 15.7±0.4 2.9±0.7
      Orbital period [days] 6.2467±0.0000 6.25
      Semi-major axis [AU] 0.0726
      Eccentricity 0.052±0.009 N/A
      Equilibrium temperature [K] N/A N/A
      Discovery method transit
      Discovery year 2013 2015
      Last updated [yy/mm/dd] 15/01/27 17/11/29

      starStars in the system

      This table lists all stars in the system Kepler-91.

      Alternative star names KIC 8219268, KOI-2133, 2MASS J19024148+4407002, Gaia DR2 2105909326647414400
      Mass [MSun] 1.31±0.10
      Radius [RSun] 6.30±0.16
      Age [Gyr] N/A
      Metallicity [Fe/H] 0.11±0.07
      Temperature [K] 4550±75
      Spectral type N/A
      Visual magnitude 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).

      PlutoMercuryMarsVenusEarthNeptuneUranusSaturnJupiterKepler-91 bKepler-91 b Trojan

      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.

      Kepler-91 bKepler-91 b Trojan

      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) 6
      Hanno Rein hanno(at) 3
      Ryan Varley ryanjvarley(at) 2

      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.