Vol. 9 No. 1 January 1, 2013 Page 37 Journal of Double Star Observations Introduction A two-day Summer Double Star Workshop was held by the High Desert Astronomical Society (HiDAS) and the Central Coast Astronomical Society (CCAS) to measure and report on the double star system µ Boötis (STFA 28AB). The observations were made at the Lewis Center for Educational Research in Apple Valley, California by a team of students from Victor Valley College. The star system STFA 28AB is identified in the Washington Double Star Catalog (WDS) as WDS 15245+3723, located at right ascension 15hr 24' 05'' and declination +37° 23'. The magnitudes of the pri- mary and secondary stars are listed as 4.3 and 7.1, respectively. We compared our observations to late 18 th and early 19 th century observations, as well as the most recent ten observations listed in the WDS. The WDS and the Set of Identifications, Meas- urements, and Bibliography for Astronomical Data (SIMBAD) were used to find different identifiers, including 51 Boo A, ADS 9626, BDS 7258, CHR 181A, H 6_17, IDS 15207+3742, mu 1 Boo, STFA 28Aa-BC, STFA 28AB, SAO 64686, STTA 139, and TYCO-2 2570-01521-1. Student Measurements of the Double Star STFA 28AB Compared with 18 th - 21 st Century Observations Mark Brewer 1,2,3,4 , Jolyon Johnson 5 , Russell Genet 3,4,6 , Anthony Rogers 2,4 , Deanna Zapata 1 , William Buehlman 1 , Gary Ridge 1,2 , Hannah Jarrett 1 , Stephen McGaughey 4,7 , and Joseph Carro 3,4 1. Victor Valley Community College, 2. High Desert Astronomical Society, 3. Central Coast Astronomical Society, 4. California Double Star Association, 5. California State University, Chico, 6. California Polytechnic State University, 7. Haleakala Amateur Astronomers Abstract: Five students participated in a summer double star workshop at the Lewis Center for Educational Research in Apple Valley, California. An 8-inch Schmidt-Cassegrain telescope with a 12.5mm Celestron Micro Guide eyepiece was used to measure the position angle and separation of the double star STFA 28AB which was found, respectively, to be 170° and 108 arc seconds. The results were compared to late 18 th and early 19 th century observations as well as the most recent ten observations listed in the Washington Double Star Catalog. The measured separation changed by 20 arc seconds between 1781 and 1800 and then did not change significantly for the subsequent 212 years. The authors suggest either a procedural error by Herschel or, if binary, the orbital inclination of the system may explain the change. Figure 1: The observers from left to right: Gary Ridge, Mark Brewer, William Buehlman, Deanna Zapata, and Hannah Jarrett.