NGC 6087

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File:NGC 6087 map.png

Map showing the location of NGC 6087

NGC 6087 (also known as Caldwell 89 or the S Normae Cluster) is an open cluster of 40 or more^[1]^[2] 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,^[2] and the period/luminosity relationship of Cepheid variables allows the distance to be determined with confidence.

References

↑ 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.
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External links

Template:Sky Template:Caldwell catalogue Template:NGC65 Template:Norma (constellation)

[1] 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.

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[1]

[2]

NGC 6087

References

External links

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