Half the size of M10, which I imaged on the same night. M107 is only ~10 arcminutes in diamter.
Wikipedia: Messier 107 or
M107, also known as
NGC 6171 or the
Crucifix Cluster, is a very loose
globular cluster in a very mildly
southern part of the sky close to the
equator in
Ophiuchus, and is the last such object in the
Messier Catalogue.
It was discovered by
Pierre Méchain in April 1782, then independently by
William Herschel in 1793. Herschel's son, John, in his 1864 General Catalogue, described it as a "globular cluster of stars, large, very rich, very much compressed, round, well resolved, clearly consisting of stars".
[5] It was not until 1947 that
Helen Sawyer Hogg added it and three other objects found by Méchain to the modern Catalogue, the latter having contributed several of the suggested observation objects which Messier had verified and added.
[9] The cluster is to be found 2.5° south and slightly west of the star
Zeta Ophiuchi.
[5]M107 is close to the
galactic plane and about 20,900
light-years from
Earth[3] and 9,800 ly (3,000 pc) from the
Galactic Center.
[10] Its orbit is partly as far out as the
galactic halo, as is between 9,200–12,400 ly (2,820–3,790 pc) from the
Galactic Center, the lower figure, the "perigalactic distance" sees it enter and leave the
galactic bar.
[11]
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