  CCD photometric observations of the Algol-type eclipsing binary AT Peg have
been obtained. The light curves are analyzed with modern techniques and new
geometric and photometric elements are derived. A new orbital period analysis
of the system, based on the most reliable timings of minima found in the
literature, is presented and apparent period modulations are discussed with
respect to the Light-Time effect (LITE) and secular changes in the system. The
results of these analyses are compared and interpreted in order to obtain a
coherent view of the system's behaviour.
