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 ...
For this week’s naked-eye object, I’ve chosen two stars separated by one-quarter of the sky: Antares (Alpha [α] Scorpii) and Ras Algethi (Alpha Herculis). Because it’s brighter, start with Antares.
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