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Hi JP
Out of curiosity and because I like double star observing, I had a look at Beta Ph last night or I should say early this morning. Using an 10" f6 newt on an EQ6 at 300X I would have to say splitting A / B was inconclusive. The seeing was average, maybe 5 / 10 Pickering but in moments of steadiness it seemed that there were 2 Airy discs, touching, forming the classic hourglass shape.
The quoted latest measures in the WDS are 0.6" separation so in reality to get a definite split an aperture of 12" or more would be needed, along with good seeing conditions.
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