page_title: TRAPPIST-1
hierarchical_section_title: TRAPPIST-1
caption_attribution_description: English: PIA22093: TRAPPIST-1 Planet Lineup - Updated Feb. 2018 Labeled version https://photojournal.jpl.nasa.gov/catalog/PIA22093 View the animation This artist's concept shows what the TRAPPIST-1 planetary system may look like, based on available data about the planets' diameters, masses and distances from the host star, as of February 2018. This image represents an updated version of PIA21422, which was created in 2017. The planets' appearances were re-imagined based on a 2018 study using additional observations from NASA's Spitzer and Kepler space telescopes, in addition to previous data from Spitzer, the ground-based TRAPPIST (TRAnsiting Planets and PlanetesImals Small Telescope) telescope and other ground-based observatories. The system was named for the TRAPPIST telescope. The new analysis concludes that the seven planets of TRAPPIST-1 are all rocky, and some could contain significant amounts of water. TRAPPIST-1 is an ultra-cool dwarf star in the constellation Aquarius, and its planets orbit very close to it. The form that water would take on TRAPPIST-1 planets would depend on the amount of heat they receive from their star, which is a mere 9 percent as massive as our Sun. Planets closest to the star are more likely to host water in the form of atmospheric vapor, while those farther away may have water frozen on their surfaces as ice. TRAPPIST-1e is the rockiest planet of them all, but still is believed to have the potential to host some liquid water. In this illustration, the relative sizes of the planets and their host star, an ultracool dwarf, are all shown to scale. NASA's Jet Propulsion Laboratory, Pasadena, California, manages the Spitzer Space Telescope mission for NASA's Science Mission Directorate, Washington. Science operations are conducted at the Spitzer Science Center at Caltech, also in Pasadena. Spacecraft operations are based at Lockheed Martin Space Systems Company, Littleton, Colorado. Data are archived at the Infrared Science Archive housed at Caltech/IPAC. Caltech manages JPL for NASA. For additional information about the Spitzer mission, visit http://www.nasa.gov/spitzer and http://spitzer.caltech.edu. For additional information on the Kepler and the K2 mission, visit www.nasa.gov/Kepler. For additional information about exoplanets, visit https://exoplanets.nasa.gov/
context_page_description: TRAPPIST-1 is an ultracool red dwarf star located almost 40 light years away from the Sun in the constellation of Aquarius. The red dwarf is known for having seven Earth-sized rocky planets around it. These planets were discovered between 2016 and 2017, and are likley rocky and some may even have liquid water on them. Four of these planets are in the habitable zone, so they are most likely to have liquid water. Three other planets here are not in the habitable zone, and are likely not habitable.
  In August of 2017, the Hubble Space Telescope possibly found traces of possible water in the atmospheres of some of the TRAPPIST-1 planets.
context_section_description: TRAPPIST-1 (or 2MASS J23062928-0502285) is an ultracool red dwarf star located almost 40 light years away from the Sun in the constellation of Aquarius. The red dwarf is known for having seven Earth-sized rocky planets around it. These planets were discovered between 2016 and 2017, and are likley rocky and some may even have liquid water on them. Four of these planets (d, e, f, and g) are in the habitable zone, so they are most likely to have liquid water. Three other planets here (b, c, and h) are not in the habitable zone, and are likely not habitable. 
  In August of 2017, the Hubble Space Telescope possibly found traces of possible water in the atmospheres of some of the TRAPPIST-1 planets.
caption: Impression of the planets around TRAPPIST-1.
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