TRAPPIST-1 is an ultra-cool dwarf star of spectral class M8.0±0.5 that is approximately 8% the mass of and 11% the radius of the Sun. Although it is slightly larger than Jupiter, it is about 84 times more massive. It has a temperature of 2,238 °C and is ~ 7.6 billion years old. It lies ~ 40 light-years from the Sun in the constellation AquariusSeven temperate terrestrial planets have been detected orbiting the star, a larger number than detected in any other planetary system. Three of these are considered to be within its habitable zone, and the others could also be habitable as they may possess liquid water somewhere on their surface. In November 2018, researchers determined that planet e is the most likely Earth-like ocean world and "would be an excellent choice for further study with habitability in mind."This image comprises 4 x Luminance (300 seconds each) and 4 x Red, Green and Blue (200, 200 and 166 seconds each), 0.5m f/2.9 ASA Astrograph with FLI ML3200 camera at an altitude of 55 degrees over two nights, 17 October 2017 and 2 September 2018. The field of view is 29’ x 19’.