Celestial hemisphere:  Southern  ·  Constellation: Ophiuchus (Oph)  ·  Contains:  M 107  ·  NGC 6171
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M 107 The Crucifix Cluster in Ophiuchus, Ian Parr
M 107 The Crucifix Cluster in Ophiuchus
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M 107 The Crucifix Cluster in Ophiuchus

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M 107 The Crucifix Cluster in Ophiuchus, Ian Parr
M 107 The Crucifix Cluster in Ophiuchus
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M 107 The Crucifix Cluster in Ophiuchus

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Description

Messier 107 is a very loose globular cluster in Ophiuchus and about 20,900 light-years from Earth, and is the last such object in the Messier Catalogue.
Apparant Magnitude is 7.8 and is about 13 arcminutes in size.  Admiral William Henry Smyth observed M107 in May 1837 and offered the name in his description: 
A large but pale granulated cluster of small stars, on the Serpent-bearer‘s right leg. There are five telescopic stars around it, so placed as to form a crucifix, when the cluster is high in the field; but the region immediately beyond is a comparative desert. The night was pretty good and I left it running to 4am and did not need to reject a single sub-frame!

In  this revision the new BlurXterminator AI Library 4 is a huge improvment when working with star clusters and GHS really helps to keep the star colors.

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M 107 The Crucifix Cluster in Ophiuchus, Ian Parr