Abstract
We study near-infrared properties of the old open cluster King 11, based on the 2MASS photometric data. We determine the location of the red giant clump(RGC) in the (K, J - K) colo-magnitude diagram and derive the distance modulus of King 11 to be <TEX>$(m-M)_0$</TEX> = <TEX>$12.50{\pm}0.10$</TEX> using the mean K magnitude of RGC. From the red giant branch slope - [Fe/H] relation we obtain the metallicity of this cluster, [Fe/H]=<TEX>$-0.17{\pm}0.07$</TEX>. The age and interstellar reddening of this cluster are estimated to be log t = <TEX>$9.48{\pm}0.05$</TEX>, E(B-V)=<TEX>$0.90{\pm}0.03$</TEX>, by applying Padova isochrone fits to the data.
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