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  • BBC Sky at Night

    Spring sights

    Mar 24, 2022 5 minutes

    Cancer, the Crab

    The well-known constellation harbours two open star clusters

    M67 (mag. +6.9, 30’ across) is located in the eastern part of Cancer, 1° 44’ west of mag. +4.2 star Acubens (Alpha (a) Cancri). While most open clusters are young, M67 is old – between 3 to 5 billion years. It may not be a spectacular sight, but it is visible from urban and suburban locations and is well-framed in a medium-power eyepiece.

    , (mag. +3.1, 1° 10’ across), is located near the centre of Cancer’s stick figure. Also known as the , from dark locations M44 is visible as a hazy patch with the naked eye, with 20 stars glowing at mag. +8.0 or brighter. The brightest, Epsilon (e) Cancri, is nearly visible without optical aid at mag. +6.3. M44 is not as impressive in a

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