Speckle interferometry at the US naval observatory. XIII

The results of 1424 speckle interferometric observations of double stars, made with the 26 inch ( 66 cm) refractor of the US Naval Observatory, are presented. Each speckle interferometric observation of a system represents a combination of over 2000 short-exposure images. These observations are averaged into 1053 mean relative positions and range in separation from 0.36 '' to 61.92 '', with a median separation of 10.31 ''. This is the 13th in a series of papers presenting measurements obtained with this system and covers the period 2006 January 12-December 29. Included in these data are nine older measurements whose positions were previously deemed possibly aberrant but are no longer classified this way following a confirming observation. This paper also includes the first data obtained using a new "secondary'' camera, designed and built at USNO.