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We present B, V, I time-series photometry of the Coma Berenices dwarfspheroidal galaxy, a faint Milky Way satellite, recently discovered by theSloan Digital Sky Survey. We have obtained V, B-V and V, V-I color-magnitudediagrams that reach V~23.0-23.2 mag showing the galaxy turnoff at V~21.7 mag,and have performed the first study of the variable star population of this newMilky Way companion. Two RR Lyrae stars (a fundamental-mode -RRab- and a firstovertone -RRc- pulsator) and a short period variable with period P=0.12468 dayswere identified in the galaxy. The RRab star has a rather long period ofP_ab=0.66971 days and is about 0.2 mag brighter than the RRc variable and othernon-variable stars on the galaxy horizontal branch. In the period-amplitudediagram the RRab variable falls closer to the loci of Oosterhoff type-IIsystems and evolved fundamental-mode RR Lyrae stars in the Galactic globularcluster M3. The average apparent magnitude of the galaxy horizontal branch,<V_HB>=18.64+-0.04 mag, leads to a distance modulus for the Coma dSphmu_0=18.13+-0.08 mag, corresponding to a distance d=42^{+2}_{-1} kpc, byadopting a reddening E(B-V) = 0.045 +- 0.015 mag and a metallicity [Fe/H]=-2.53+- 0.05 dex.

Pulsating Variable Stars in the Coma Berenices dwarf spheroidal galaxy