Saturday, May 02, 2020

happy binary day!

Happy anniversary to all you splitters out there. πŸŽ‰

Today is the anniversary of the discovery of the first binary star in 1780.

On May 2, William Herschel discovered the first binary star, ΞΎ (xi) Ursae Majoris. Orbital period is about 60 years. You can watch it move! :-o


I looked at Alula Australis last night in a 90mm 'scope. Very tight but doable.

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