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We present deep wide-field optical CCD photometry and mid-infraredSpitzer/IRAC and MIPS 24micron data for about 100,000 stars in the young opencluster IC 1805. The members of IC 1805 were selected from their location inthe various color-color and color-magnitude diagrams, and the presence ofHalpha emission, mid-infrared excess emission, and X-ray emission. Thereddening law toward IC 1805 is nearly normal (R_V = 3.05+/-0.06). However, thedistance modulus of the cluster is estimated to be 11.9+/-0.2 mag (d =2.4+/-0.2 kpc) from the reddening-free color-magnitude diagrams, which islarger than the distance to the nearby massive star-forming region W3(OH)measured from the radio VLBA astrometry. We also determined the age of IC 1805(tau_MSTO = 3.5 Myr). In addition, we critically compared the age and massscale from two pre-main-sequence evolution models. The initial mass functionwith a Salpeter-type slope of Gamma = -1.3+/-0.2 was obtained and the totalmass of IC 1805 was estimated to be about 2700+/-200 M_sun. Finally, we foundour distance determination to be statistically consistent with the Tycho-GaiaAstrometric Solution Data Release 1, within the errors. The proper motion ofthe B-type stars shows an elongated distribution along the Galactic plane,which could be explained by some of the B-type stars being formed in smallclouds dispersed by previous episodes of star formation or supernovaexplosions.

An Optical and Infrared Photometric Study of the Young Open Cluster IC 1805 in the Giant H II Region W4