Composition and activity of comet C/2020 M3 (ATLAS) with the TRAPPIST-North telescope

TRAPPIST (for TRAnsiting Planets and PlanetesImals Small Telescope) is a set of two twins robotic telescopes with a diameter of 60 cm. TRAPPIST-South was installed at La Silla ESO Observatory (Chile) in 2010 [1], and TRAPPIST-North at the Oukaimeden Observatory (Morocco) in 2016. The TRAPPIST telescopes are entirely robotic, equipped with a sensitive CCD camera and a complete set of narrow and broad-band filters. They allow to measure the production rates of several gas species (OH, NH, CN, C 3 and C 2) and the dust [2]. With these two telescopes, we follow-up comets activity continuously along their orbit from both Northern and Southern hemispheres. In this work, we present the results of comet C/2020 M3 (ATLAS). We show its chemical composition and activity evolution over a wide range of distances from the Sun and on both sides of perihelion. We measure the production rates of each daughter molecule using the Haser model [3], in addition to the Afρ parameter to estimate the dust production in the coma. We calculate the ratios of production rates with respect to OH and CN for different molecules as well as the gas/dust ratio. These results allow us to classify the comet C/2020 M3 (ATLAS) in the current taxonomy [4] and better understand the link between comets chemical compositions and their origin.