Abstract
A sparse and widely dispersed cluster with many 10th and 11th magnitude stars, the cluster can be glimpsed in binoculars as a diffuse glow centered on a yellowish 6.5 magnitude star (it has also been called reddish-orange!).
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Notes
- 1.
The Revised New General Catalogue.
- 2.
At the time of writing. No doubt this will change as new, more massive stars are found.
- 3.
Alas, this wonderful globular cluster is not visible from the UK, or northern parts of the United States, but it is truly an amazing object to observe, and should you have the chance to see it, then do so.
- 4.
I believe that this nebula presents one of the greatest challenges for a naked-eye observer.
- 5.
“Metal-poor” indicates it has low amounts of elements heavier than hydrogen and helium.
- 6.
See entry at end of this section on Scorpius.
- 7.
Capella and a Canum Venaticorum are also thought to be members of the even larger Taurus Stream, which has a motion through space similar to the Hyades, and thus may be related.
- 8.
The bright stars that extend from Perseus, Taurus and Orion, and down to Centaurus and Scorpius, including the Orion and Scorpius-Centaurus associations, lie at an angle of about 1.5° to the Milky Way, and thus to the equatorial plane of the galaxy. This group or band of stars is often called Gould’s Belt.
- 9.
This is known as retrograde motion and applies to any celestial object moving in a direction contrary to most other objects.
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Inglis, M. (2013). The Constellations and Their Star Clusters. In: Observer’s Guide to Star Clusters. The Patrick Moore Practical Astronomy Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-7567-5_2
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