11441 Anadiego, provisional designation 1975 YD, is a stony asteroid from the middle region of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 31 December 1975, by Argentine astronomer Mario R. Cesco at the El Leoncito Complex in western Argentina.
The S-type asteroid orbits the Sun at a distance of 1.9–3.2 AU once every 4 years and 1 month (1,497 days). Its orbit has an eccentricity of 0.26 and an inclination of 12° with respect to the ecliptic. As no precoveries were taken, the asteroid's observation arc starts with its discovery observation in 1975.
A rotational light-curve was obtained for this asteroid by astronomer Kevin Hills at the Australian Riverland Dingo Observatory in February 2013. It gave a rotation period of 7000317900000000000♠3.179±0.001 hours with a brightness variation of 0.11 magnitude (U=2).
According to the surveys carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 6.8 and 7.3 kilometers in diameter and its surface has an albedo of 0.287 and 0.254, respectively. The Collaborative Asteroid Lightcurve Link assumes a lower standard albedo for stony asteroids of 0.20, and, correspondingly calculates a larger diameter of 8.2 kilometers, based on an absolute magnitude of 12.8.
The minor planet was named in memory of Ana Teresa Diego (1954–1976), an astronomy student at La Plata Astronomical Observatory and political activist who was kidnapped and disappeared in September 1976 by unidentified persons believed working for the military junta then ruling Argentina. Naming citation was published 10 December 2011 (M.P.C. 77501).