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Head south for a Messier globular duo – Astronomy Now

June 30, 2024
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Head south for a Messier globular duo – Astronomy Now
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Messier 4 is certainly one of largest and loosest globular clusters within the Messier catalogue. Picture: Adam Block.

The night time sky in early summer season is filled with so many nice globular clusters that it’s laborious to know the place to look first. Messier 13 and Messier 5 are clear favourites, and the Messier hoards in Ophiuchus beckon, however why not head south for a change to the mighty southern constellation of Scorpius to discover Messier 4 and Messier 80, a pairing that gives fascinating and contrasting observing and bodily traits.

Messier 4: a top-drawer globular

Messier 4 (NGC 6121) is the extra well-known of the 2 globular clusters. Shinning at magnitude +5.8 and overlaying a considerable 26’, it is likely one of the largest globulars we see. Messier 4 can also be one of many closest clusters, mendacity about 7,200 gentle years away. Its proximity accounts for its giant obvious diameter, as bodily Messier 4 is relatively on the small aspect, spanning simply 75 gentle years throughout.

Messier 4 lies about 80’ west of Antares (alpha [α] Scorpii, magnitude +1.06), Scorpius’ nice purple supergiant luminary. Scorpius is a horizon-hugging constellation from UK shores, which is a crying disgrace because it’s filled with a marvellous collection of sensible deep-sky quarry.

Initially of June, Antares and Messier 4 culminate at about 12.40am BST with a lowly altitude of round 12°. Given an uninterrupted southern vista, a pair of 10 x 50 binoculars will present the pair, and a small telescope could begin to resolve a few of Messier 4’s particular person stars on a clear and regular night time, regardless of the cluster’s unfavourable altitude. It helps that Messier 4 is likely one of the loosest globulars within the sky, rated class IX on the 12-point (I to XII) Shapley–Sawyer focus scale.

Messier 80 lies over 4 instances additional away than Messier 4 and is likely one of the most dense and compact clusters identified. Picture: Jim Misti.

Compact Messier 80

Messier 80 (NGC 6093) lies 4.5° north-northwest of Messier 4 and, at a distance of round 32,600 gentle years, is sort of 5 instances additional away. It’s additionally some of the dense and compact globular cluster identified; within the Messier catalogue, its ranking of II on the Shapley–Sawyer scale is matched solely by Messier 2.

Messier 80 is positioned about 4 levels east of magnitude +2.3 Dschubba (delta [δ] Scorpii) and, shining at magnitude +7.3, is shiny sufficient to be picked up in 10 x 50 binoculars. Owing to its compactness throughout its 8.9’ sphere, and its proximity to the horizon, observers at mid-northern latitudes will discover it powerful to resolve particular person stars inside Messier 80, however by all means have a go!

Messier 4 and Messier 80 are a pair of globular clusters within the spectacular constellation of Scorpius. AN graphic by Greg Smye-Rumsby.



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