This is the closest double I’ve observed yet. It appeared as a single, slightly elongated star that points west-northwest/east-southeast. PA appears to be either 120Â° or 300Â°, depending on which star is the primary. According to notes in the WVDSC, the pair has a 123 year period.
|Subject||Zeta Bootis (âˆ’1865)|
|Position (J2000)||Bootes [RA: 14:41:09 / Dec: +13:43:41]*|
|Position Angle*||303Â° (1991)|
|Magnitudes*||4.5 / 4.6|
|Date/Time||SEP 03, 2006 – 10:00 PM MST (SEP 04, 2006 – 05:00 UT)|
|Observing Loc.||Flagstaff, AZ – Home|
|Instrument||Orion SVP 6LT Reflector (150 mm dia./1200 mm F/L)|
|Eyepieces/Mag.||10 mm + 2X Barlow (240X)|
|Conditions||Partly cloudy, calm|
|Transparency||NELM Mag ~4.0|
|References||Tycho Double Star Catalogue (Fabricius+ 2002); The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996); and Catalog of Components of Double & Multiple Stars (Dommanget+ 2002) via VizieR|
*Based on published data.