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I have also found Beta Musca difficult to split, however, last year I was able to split it with a 140mm Vixen Achromat.
In a thread about Antares B, this is what I wrote last June:
...However, last night was special as the evening had very good seeing. It was an unusual day with Cairns having fog in the morning. That is a rare event here.
So flushed with success, I tried to split Beta Musca, which I have been trying to do for the last 30 years with many different scopes. With 230x, I could see the discs were overlapping, but not separated. At 265x, I could see the discs were close and was not sure if they were separated. With 320x, I had to patiently wait for moments of better seeing and then I could see that they were separated. At 400x, it was too much power and it was never clear enough to see anything.
I am delighted; I never expected to ever see Beta Musca split.
I started to think of more difficult splits, but the clouds rolled in about 8.45pm and ended the evenings viewing.
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