"Mark Lepkowski wrote in message
How bright does a star have to be to be visible with a small telescope in
broad daylight?

Polaris ( alpha ursae minoris ) I find easy at any time of day or night
throughout the year from near London ( given a clear patch of sky in that
direction. A 2 inch aperture refractor is usually sufficient. It's
certainly very prominent in my 6 inch aperture scope without any special
filters needed.

Gamma Andromedae ( magnitudes approx 2.3 and 5.1 at 9.8 seconds separation )
I have easily observed as a double star in my F8 150mm aperture refractor,
even when the sun was shining directly onto my face during observing !

Anthony