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We present new deep and accurate space (Advanced Camera for Surveys -- WideField Planetary Camera 2 at the Hubble Space Telescope) and ground-based(Suprime-Cam at Subaru Telescope, Mega-Cam at Canada-France-Hawaii Telescope)photometric and astrometric data for the Local Group dwarf irregular IC10. Weconfirm the significant decrease of the young stellar population when movingfrom the center toward the outermost regions. We find that the tidal radius ofIC10 is significantly larger than previous estimates of $r_t \lesssim$ 10\min.By using the $I$,\vmi\ Color Magnitude Diagram based on the Suprime-Cam data wedetect sizable samples of red giant (RG) stars up to radial distances of18-23$'$ from the galactic center. The ratio between observed star counts(Mega-Cam data) across the tip of the RG branch and star counts predicted byGalactic models indicate a star count excess at least at a 3$\sigma$ level upto 34-42\min\ from the center. This finding supports the hypothesis that thehuge H{\size{I}} cloud covering more than one degree across the galaxy isassociated with IC10 \citep{huchtmeier79,cohen79}. We also provide newestimates of the total luminosity ($L_V\sim9\times$$10^7$ $L_\odot$,$M_V$$\sim$-15.1 mag) that agrees with similar estimates available in theliterature. If we restrict to the regions where rotational velocitymeasurements are available (r$\approx13'$), we find a mass-to-light ratio($\sim$10 $M_\odot$ $L_\odot$) that is at least one order of magnitude largerthan previous estimates. The new estimate should be cautiously treated, sinceit is based on a minimal fraction of the body of the galaxy.

On the radial extent of the dwarf irregular galaxy IC10