Recurring Nova RS Ophiuchi Blows its Top!

On August 8 and visible now during the summer, the faint cataclysmic variable star RS Ophiuchi at over 6,500 light-years distant brightened from magnitude 11.2 to 4.8 during the August 8-9, 2021 time frame. It went from a threshold small-telescope object to naked-eye visibility within 24 hours. Irish amateur Astronomer Keith Geary was the first[…]

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