TRAPPIST first post-perihelion production rates of the Interstellar comet 3I/ATLAS

The authors report that they obtained, using the TRAPPIST-North (Z53) robotic telescope installed at the Oukaimeden Observatory in Morocco, observations of the interstellar comet 3I/ATLAS during two hours before sunrise on three consecutive photometric nights, Nov. 22, 27, and 28. They used broadband B, V, R, I filters and cometary HB narrowband (gas and dust) continuum filters (Farnham et al. 2000, Jehin et al. 2011) and computed preliminary production rates from extracted profiles at 10.000 km from the optocenter of the comet using a Haser Model (Vp=Vd=1km/s) (Haser 1957).