[AZ-Observing] Re: Zeta Boo

     Yes, it's closed a fair bit in the past decade.  Buried at the
USNO-Washington double-star site are recent speckle observations,
he most recent of which (about a year ago) put it at 0".68.

http://ad.usno.navy.mil/wds/int4.html

At that separation 6-inches aperture should show the pair as somewhat
overlapped but clearly not a single star.  Gotta have good seeing of course.

\Brian
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