Fork me on GitHub
an open source database of all discovered extrasolar planets

TRAPPIST-1

The planetary system TRAPPIST-1 hosts at least 7 planets.

  System parameters
Primary system name TRAPPIST-1
Alternative system names 2MASS J23062928-0502285
Right ascension 23 06 30.34
Declination -05 02 36.44
Distance [parsec] 12.56±0.12edit
Distance [lightyears] 41.0±0.4
Number of stars in system 1
Number of planets in system 7

ArchitectureArchitecture of the system

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

  •  TRAPPIST-1, stellar object
    •  TRAPPIST-1 b, planet, semi-major axis: 0.0111±0.0003 AU
      •  TRAPPIST-1 c, planet, semi-major axis: 0.0152±0.0005 AU
        •  TRAPPIST-1 d, planet, semi-major axis: 0.0215±0.0006 AU
          •  TRAPPIST-1 e, planet, semi-major axis: 0.0282+0.0008−0.0009 AU
            •  TRAPPIST-1 f, planet, semi-major axis: 0.0371±0.0011 AU
              •  TRAPPIST-1 g, planet, semi-major axis: 0.0451±0.0014 AU
                •  TRAPPIST-1 h, planet, semi-major axis: 0.0596 AU

                PlanetsPlanets in the system

                This table lists all planets in the system TRAPPIST-1.

                  TRAPPIST-1 b TRAPPIST-1 c TRAPPIST-1 d TRAPPIST-1 e TRAPPIST-1 f TRAPPIST-1 g TRAPPIST-1 h
                Alternative planet names 2MASS J23062928-0502285 b 2MASS J23062928-0502285 c 2MASS J23062928-0502285 d 2MASS J23062928-0502285 e 2MASS J23062928-0502285 f 2MASS J23062928-0502285 g 2MASS J23062928-0502285 h
                Description Astronomers have found this system of seven Earth-sized planets just 40 light-years away. Using ground and space telescopes the planets were all detected as they passed in front of their parent star, the ultracool dwarf star known as TRAPPIST-1. The six inner planets form a near-resonant chain such that their orbital periods (1.51, 2.42, 4.04, 6.06, 9.21, 12.35 days) are near ratios of small integers. This architecture suggests that the planets formed farther from the star and migrated inward. The seven planets have equilibrium temperatures low enough to support liquid water on their surfaces.edit Astronomers have found this system of seven Earth-sized planets just 40 light-years away. Using ground and space telescopes the planets were all detected as they passed in front of their parent star, the ultracool dwarf star known as TRAPPIST-1. The six inner planets form a near-resonant chain such that their orbital periods (1.51, 2.42, 4.04, 6.06, 9.21, 12.35 days) are near ratios of small integers. This architecture suggests that the planets formed farther from the star and migrated inward. The seven planets have equilibrium temperatures low enough to support liquid water on their surfaces.edit Astronomers have found this system of seven Earth-sized planets just 40 light-years away. Using ground and space telescopes the planets were all detected as they passed in front of their parent star, the ultracool dwarf star known as TRAPPIST-1. The six inner planets form a near-resonant chain such that their orbital periods (1.51, 2.42, 4.04, 6.06, 9.21, 12.35 days) are near ratios of small integers. This architecture suggests that the planets formed farther from the star and migrated inward. The seven planets have equilibrium temperatures low enough to support liquid water on their surfaces.edit Astronomers have found this system of seven Earth-sized planets just 40 light-years away. Using ground and space telescopes the planets were all detected as they passed in front of their parent star, the ultracool dwarf star known as TRAPPIST-1. The six inner planets form a near-resonant chain such that their orbital periods (1.51, 2.42, 4.04, 6.06, 9.21, 12.35 days) are near ratios of small integers. This architecture suggests that the planets formed farther from the star and migrated inward. The seven planets have equilibrium temperatures low enough to support liquid water on their surfaces.edit Astronomers have found this system of seven Earth-sized planets just 40 light-years away. Using ground and space telescopes the planets were all detected as they passed in front of their parent star, the ultracool dwarf star known as TRAPPIST-1. The six inner planets form a near-resonant chain such that their orbital periods (1.51, 2.42, 4.04, 6.06, 9.21, 12.35 days) are near ratios of small integers. This architecture suggests that the planets formed farther from the star and migrated inward. The seven planets have equilibrium temperatures low enough to support liquid water on their surfaces.edit Astronomers have found this system of seven Earth-sized planets just 40 light-years away. Using ground and space telescopes the planets were all detected as they passed in front of their parent star, the ultracool dwarf star known as TRAPPIST-1. The six inner planets form a near-resonant chain such that their orbital periods (1.51, 2.42, 4.04, 6.06, 9.21, 12.35 days) are near ratios of small integers. This architecture suggests that the planets formed farther from the star and migrated inward. The seven planets have equilibrium temperatures low enough to support liquid water on their surfaces.edit Astronomers have found this system of seven Earth-sized planets just 40 light-years away. Using ground and space telescopes the planets were all detected as they passed in front of their parent star, the ultracool dwarf star known as TRAPPIST-1. The six inner planets form a near-resonant chain such that their orbital periods (1.51, 2.42, 4.04, 6.06, 9.21, 12.35 days) are near ratios of small integers. This architecture suggests that the planets formed farther from the star and migrated inward. The seven planets have equilibrium temperatures low enough to support liquid water on their surfaces.edit
                Lists Confirmed planets
                Mass [Mjup] 0.0025±0.0008edit 0.005±0.002edit 0.0010±0.0005edit ( 8+18−8 )·10-4edit 0.0011±0.0004edit 0.0018±0.0001edit ( 3±3 )·10-4edit
                Mass [Mearth] 0.8±0.3 1.6±0.6 0.33±0.15 0.3+0.6−0.3 0.36±0.12 0.57±0.04 0.09±0.08
                Radius [Rjup] 0.097±0.003edit 0.094±0.003edit 0.069±0.003edit 0.082±0.004edit 0.093±0.003edit 0.101±0.004edit 0.064±0.004edit
                Radius [Rearth] 1.06±0.03 1.03±0.03 0.76±0.03 0.90±0.04 1.02±0.04 1.10±0.04 0.70±0.05
                Orbital period [days] 1.5109±0.0000edit 2.4218±0.0000edit 4.0498±0.0002edit 6.0996±0.0001edit 9.2065±0.0005edit 12.3528±0.0004edit 18.7663±0.0007edit
                Semi-major axis [AU] 0.0111±0.0003edit 0.0152±0.0005edit 0.0215±0.0006edit 0.0282+0.0008−0.0009edit 0.0371±0.0011edit 0.0451±0.0014edit 0.0596edit
                Eccentricity 0.019±0.008edit 0.014±0.005edit 0.003+0.004−0.003edit 0.007±0.003edit 0.011±0.003edit 0.003±0.002edit 0.09±0.03edit
                Equilibrium temperature [K] 400±8edit 342±7edit 288±6edit 251±5edit 219±4edit 199±4edit 167.0edit
                Discovery method transit
                Discovery year 2016 2016 2017 2017 2017 2017 2017
                Last updated [yy/mm/dd] 17/04/13

                starStars in the system

                This table lists all stars in the system TRAPPIST-1.

                  TRAPPIST-1
                Alternative star names 2MASS J23062928-0502285
                Mass [MSun] 0.080±0.007edit
                Radius [RSun] 0.121±0.003edit
                Age [Gyr] 8±2edit
                Metallicity [Fe/H] 0.04±0.08edit
                Temperature [K] 2559±50edit
                Spectral type M8 V
                Visual magnitude 18.75±0.03edit

                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).

                PlutoMercuryMarsVenusEarthNeptuneUranusSaturnJupiterTRAPPIST-1 bTRAPPIST-1 cTRAPPIST-1 dTRAPPIST-1 eTRAPPIST-1 fTRAPPIST-1 gTRAPPIST-1 h

                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 zoneTRAPPIST-1 bTRAPPIST-1 cTRAPPIST-1 dTRAPPIST-1 eTRAPPIST-1 fTRAPPIST-1 gTRAPPIST-1 h

                referencesScientific references and contributors

                Links to scientific papers and other data sources

                history http://www.eso.org/public/news/eso1706/
                history http://www.eso.org/public/archives/releases/sciencepapers/eso1615/eso1615a.pdf
                history https://www.eso.org/public/news/eso1615/

                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
                Christian Sturm Sol-d(at)users.noreply.github.com 1
                Claudionor Buzzo Raymundo raymuncb(at)gmail.com 1
                Hanno Rein hanno(at)hanno-rein.de 6

                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 usefule.

                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.