We report on photometry and imaging of the Jupiter Family Comets 41P/Tuttle-Giacobini-Kresak and 45P/Honda-Mrkos-Pajdusakova with the TRAPPIST-North telescope .
We observed 41P on 34 nights from February 16 , 2017 to July 27 , 2017 pre- and post-perihelion ( r _ { h } =1.04 au ) , while we collected data for comet 45P from February 10 to March 30 after perihelion ( r _ { h } =0.53 au ) .
We computed the production rates of the daughter species OH , NH , CN , C _ { 3 } and C _ { 2 } and we measured the dust proxy , Af \rho , for both comets .
The peak of water production rate of 41P was ( 3.46 \pm 0.20 ) \times 10 ^ { 27 } molecules/s on April 3 , 2017 when the comet was at 1.05 au from the Sun .
We have shown that the activity of 41P is decreasing by about 30 % to 40 % from one apparition to the next .
We measured a mean water production rate for 45P of ( 1.43 \pm 0.62 ) \times 10 ^ { 27 } molecules/s during a month after perihelion .
Our results show that these Jupiter Family Comets had low gas and dust activity and no outburst was detected .
Relative abundances , expressed as ratios of production rates and Af \rho parameter with respect to OH and to CN , were compared to those measured in other comets .
We found that 41P and 45P have a typical composition in term of carbon bearing species .
The study of coma features exhibited by the CN gas species allowed the measurement of the rotation period of 41P , showing a surprisingly large increase of the rotation period from ( 30 \pm 5 ) hrs at the end of March to ( 50 \pm 10 ) hrs at the end of April , 2017 in agreement with recent observations by other teams .