  Jupiter Family Comets (JFCs), having orbital period less than 20 years,
provide us with an opportunity to observe their activity and analyse the
homogeneity in their coma composition over multiple apparitions. Comet
46P/Wirtanen with its exceptionally close approach to Earth during its 2018
apparition offered the possibility for a long-term spectroscopic observations.
We used a 1.2 m telescope equipped with a low-resolution spectrograph to
monitor the comet's activity and compute the relative abundances in the coma,
as a function of heliocentric distance. We report the production rates of four
molecules CN, C$_2$, C$_3$ and NH$_2$, and Af$\rho$ parameter, a proxy to the
dust production, before and after perihelion. We found that 46P has a typical
coma composition with almost constant abundance ratios with respect to CN
across the epochs of observation. Comparing the coma composition of comet 46P
during the current and previous apparitions, we conclude the comet has a highly
homogeneous chemical composition in the nucleus with an enhancement in ammonia
abundance compared to the average abundance in comets.
