This week’s small-telescope target is the Black Swallowtail Butterfly Cluster in northern Ophiuchus. This open cluster also goes by the designation IC 4665. It’s OK if you’ve never observed (or even ...
This week’s naked-eye object is open cluster M25 in Sagittarius. Observers also know this object as IC 4725. You’ll find it 4.4° east-northeast of magnitude 3.8 Mu (μ) Sagittarii. At magnitude 4.6, ...
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