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Open clusters Messier 29 and 39: Cygnus’ star cities

August 26, 2024
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Open clusters Messier 29 and 39: Cygnus’ star cities
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Messier 39 in Cygnus is a big, sprawling open cluster Photos: Adam Block.

Amid all of the great nebulae that Cygnus has to supply lie Messier 29 and 39, two effective open clusters that are each simply seen by way of a pair of binoculars in opposition to a marvellous Milky Approach backdrop as they trip excessive on late summer time nights.

The good summer time constellation of Cygnus, the Swan, is fantastically positioned on late-August and September nights. Its acquainted ‘Northern Cross’ asterism of its brightest stars, led by superior first-magnitude Deneb (alpha [α] Cygni), is seen overhead as quickly true astronomical darkness is properly established.

Messier 39 in Cygnus is a big, sprawling open cluster Photos: Bernard Hubl.

Owing to its place embedded within the centre the summer time Milky Approach, Cygnus naturally hosts many open clusters, together with Messier 29 (NGC 6913) and Messier 39 (NGC 7092). 

Let’s begin with the latter, M39, which to most observers’ eyes is the superior cluster; it’s definitely the larger and brighter of the pair, with its 30 or so principal members shining with an built-in magnitude of +4.6 throughout a sprawling full-Moon-sized 32 arcminutes. Its look is considerably deceptive, as M39 is bodily one of many closest (800 to 1,000 gentle years distant) and smallest of Messier’s clusters, with its member stars unfold throughout simply nine-light years of area.

Messier 39 is faintly seen with the bare eye as a brighter spot inside the wealthy Milky Approach background, mendacity some 9 levels north-east of Deneb and just below three levels north of rho (ρ) Cygni. A small telescope at low energy will present 30 or so stars in an apparent, triangular form, however maybe the most effective views are available by way of massive binoculars.

Messier 29 is straightforward to identify by way of a pair of 10 × 50 binoculars as a decent knot of stars mendacity just below two levels south-south—east of magnitude +2.2 Sadr (gamma [γ] Cygni). It shines with an built-in magnitude of +6.6 from its estimated membership of 200 plus stars and spans simply seven arcminutes on the sky. A small telescope resolves its brightest stars right into a sample that offers it the looks of a ‘mini Pleiades’ mendacity in a wealthy Milky Approach discipline.

Sadly, interstellar mud and fuel alongside its line of sight severely blights it, knocking over three magnitudes off its brightness.

Messier 29 and 39 are each simply situated in Cygnus, with the previous near Sadr, whereas the latter lies north-east of Deneb. AN graphic by Greg Smye-Rumsby.



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