Zeta Boötis (Struve 1865)

Observation Notes:

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 120° or 300°, depending on which star is the primary. According to notes in the WVDSC, the pair has a 123 year period.

Subject Zeta Bootis (−1865)
Classification Double Star
Position (J2000) Bootes [RA: 14:41:09 / Dec: +13:43:41]*
Position Angle* 303° (1991)
Separation* .91″ (1991)
Magnitudes* 4.5 / 4.6
Spectral Types* A2/A2
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

Seeing 4/10
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.

Leave a Reply

Your email address will not be published.