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NGC 6087
NGC 6087 is an open cluster of 40 or more〔Burnham's ''Celestial Handbook'' gives the number 40, though other studies go as high as 349; see Stephen James O'Meara, ''The Caldwell Objects'', Cambridge University Press, 2002, p. 351.〕〔 stars centered on the Cepheid variable S Normae in the constellation Norma. At a distance of about 3500 ly and covering a field of almost one quarter of a degree, the stars range from seventh to eleventh magnitude, the brightest being 6.5 magnitude S Normae. The aggregate visual magnitude of the cluster is about 5.4. Spectral analysis of the radial motion of the stars confirm that S Normae is a member of the cluster, and the period/luminosity relationship of Cepheid variables allows the distance to be determined with confidence. ==References==
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