Brocchi's Cluster discoverer or inventor Abd al-Rahman al-Sufi
Brocchi's Cluster (also known as Collinder 399, Cr 399 or Al Sufi's Cluster) is a asterism of six stars in an apparent row, across 1.3° of the night sky and four others, in the south of the constellation Vulpecula, thus near Sagitta.  Its nickname is the Coathanger.  None of these ten stars are believed to be much gravitationally associated, so not a star cluster, a fact not known until 1997.  An additional 30 or so much fainter stars to terrestrial observers are sometimes considered to be associated.History
It was first described by the Persian astronomer Al Sufi in his Book of Fixed Stars in 964.
In the 17th century, it was independently rediscovered by the Italian astronomer G. B. Hodierna.
In the 1920s, Dalmero Francis Brocchi, an amateur astronomer and chart maker for the American Association of Variable Star Observers (AAVSO), created a map of the stars for use in calibrating photometers.
In 1931, Swedish astronomer Per Collinder listed it in his catalogue of open clusters.
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