Study of comets activity with the TRAPPIST-North telescope

TRAPPIST-North (TRAnsiting Planets and PlanetesImals Small Telescope) is a 60-cm robotic telescope that was installed in May, 2016 at the Oukaimeden Observatory. The project is led by the University of Liège (Belgium) and the Caddi Ayad University of Marrakech (Morocco). TRAPPIST-North (TN) is a twin of TRAPPIST-South (TS) telescope which was installed at the ESO La Silla Observatory in 2010. The TRAPPIST telescopes are dedicated to the detection and characterization of planets orbiting stars other than our Sun (exoplanets) and the study of comets and other small bodies in our solar system. These telescopes have a very sensitive CCD camera with complete sets of cometary narrow band filters in order to measure the production rates of several gas species (OH, NH, CN, C3 and C2 ) and the dust. With TRAPPIST-North we can now also observe comets in the Northem hemisphere. Therefore, with the two telescopes, we can now observe continuously the comets around their orbit. We present in this work our strategy to study the evolution of the activity, chemical composition, dust properties, and coma morphology of several comets per year and of different origins over a wide range of heliocentric distances, and on both sides of perihelion. We will measure the production rates of each daughter molecules using a Haser model, in addition to the Afρ parameter to track the activity and the dust properties will be obtained through Monte Carlo models. We present the first measurements of the production rates and Afρ parameter of comet 41P/Tuttle-Giacobini-Kresak before perihelion (r=1.04 AU) and of comet 45P/Honda-Mrkos-Pajdusakova after perihelion (r=0.53 AU), that we observed with TRAPPIST telescopes.