Celestial hemisphere:  Southern  ·  Constellation: Scorpius (Sco)  ·  Contains:  M 7  ·  NGC 6475  ·  PK355-04.2  ·  PK356-04.1  ·  Ptolemy cluster
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Ptolemy Cluster - m7, Jeff Coldrey
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Ptolemy Cluster - m7

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Ptolemy Cluster - m7, Jeff Coldrey
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Ptolemy Cluster - m7

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Description

I have always enjoyed the Ptolemy Cluster visually due to its bright blue stars seeming to stand out from the background Milky Way.

It includes four Bp/Ap stars which are not well understood. These rotate slowly, have extremely strong magnetic fields, and contain high concentrations of heavy metals such as Chromium, Manganese and Mercury.

Why these stars are so magnetic remains a mystery!

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Ptolemy Cluster - m7, Jeff Coldrey