The Visual Measurements of the Double Star STTA 127 AB

A team of students, a member of the faculty at The Evergreen State College and two amateur astronomers conducted separation and position angle measurements of the double star STTA 127 AB at the 2010 Oregon Star Party east of Prinville, Oregon. Percent differences between literature and observed values for separation and position angle were less than 1.5%. Field rotation could account for inaccuracy in the position angle due to a long drift time across the astrometric eyepiece. Position angle observations by two teams studying the same star system were carried out allowing the comparisons between alt- azimuth and equatorially mounted telescopes.