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What’s more in theory the brightness of the fourth diffraction ring is 0.00005 times that of the centre of the Airy disk, or a bit fainter than 10 magnitudes.
You only stand a chance at Procyon B when you can clearly see the 4th and 5th ring well enough to look for a faint star in them, assuming an 8”-12” scope.
Last edited by Wavytone; 03-04-2019 at 07:30 PM.
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