The sky didn't look to bad here in Melbourne last night either. IU didn't have a scope out, but when I got home from work around 11pm it looked sort of ok.
A couple of months ago I split Antares with my 150mm f12 frac and ES 24mm 68º eyepiece giving 75x. The 'green' companion was easy to see, so I don't think your 140mm frac is too small at all.
Matt
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