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We have obtained deep images in the near-infrared J and K filters of fourfields in the Sculptor Group spiral galaxy NGC 55 with the ESO VLT and ISAACcamera. For 40 long-period Cepheid variables in these fields which wererecently discovered by Pietrzy{\'n}ski et al., we have determined mean J and Kmagnitudes from observations at two epochs, and derived distance moduli fromthe observed PL relations in these bands. Using these values together with thepreviously measured distance moduli in the optical V and I bands, we havedetermined a total mean reddening of the NGC 55 Cepheids of E(B-V)=0.127 $\pm$0.019 mag, which is mostly produced inside NGC 55 itself. For the true distancemodulus of the galaxy, our multiwavelength analysis yields a value of 26.434$\pm$ 0.037 mag (random error), corresponding to a distance of 1.94 $\pm$ 0.03Mpc. This value is tied to an adopted true LMC distance modulus of 18.50 mag.The systematic uncertainty of our derived Cepheid distance to NGC 55 (apartfrom the uncertainty on the adopted LMC distance) is $\pm$4%, with the maincontribution likely to come from the effect of blending of some of the Cepheidswith unresolved companion stars. The distance of NGC 55 derived from ourmultiwavelength Cepheid analysis agrees within the errors with the distance ofNGC 300, strengthening the case for a physical association of these twoSculptor Group galaxies.

The Araucaria Project. Near-Infrared Photometry of Cepheid Variables in the Sculptor Galaxy NGC 55