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We present UBVRI photometry of the open cluster NGC 2422 (age $\sim 10^8$ yr)down to a limiting magnitude $V\simeq19$. These data are used to derive theLuminosity and Mass Functions and to study the cluster spatial distribution. Byconsidering the color-magnitude diagram data and adopting a representativecluster main sequence, we obtained a list of candidate cluster members based ona photometric criterion. Using a reference field region and an iterativeprocedure, a correction for contaminating field stars has been derived in orderto obtain the Luminosity and the Mass Functions in the $M=0.4-3.5 M_\odot$range. By fitting the spatial distribution, we infer that a non-negligiblenumber of cluster stars lies outside our investigated region. We have estimateda correction to the Mass Function of the cluster in order to take into accountthe "missing" cluster stars. The Present Day Mass Function of \ngc2422 can berepresented by a power-law of index $\alpha = 3.07 \pm0.08 $ (rms) -- theSalpeter Mass Function in this notation has index $\alpha = 2.35$ -- in themass range $ 0.9 \leq M/M_\odot\leq 2.5 $. The index $\alpha$ and the totalmass of the cluster are very similar to those of the Pleiades.Comment: 12 pages, 8 ps figures, in press in Astronomy and Astrophysic

Luminosity and Mass Function of the Galactic open cluster NGC 2422