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Messier 71.jpg

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Messier 71

(also known as M71 or NGC 6838) is a globular cluster in the constellationSagitta. It was discovered by Philippe Loys de Chéseaux in 1745 and included by Charles Messier in his catalog of comet-like objects in 1780. It was also noted by Koehler at Dresdenaround 1775.

The star cluster is at a distance of about 12,000 light years away from Earth and spans some 27 light years across. The irregular variable star Z Sagittae is a member of this cluster.

M71 was long thought (until the 1970s) to be a densely packed open cluster and was classified as such by leading astronomers in the field of star cluster research due to its lacking a dense central compression, and to its stars having more "metals" than is usual for an ancient globular cluster; furthermore, it lacks the RR Lyrae "cluster" variable stars that are common in most globulars. However, modern photometric photometry has detected a short "horizontal branch" in the H-R diagramof M71, which is characteristic of a globular cluster. The shortness of the branch explains the lacking of the RR Lyrae variables and is due to the globular's relatively young age of 9-10 billion years. The relative youth of this globular also explains the abundance of "metals" in its stars[citation needed]. Hence today M71 is designated as a very loosely concentrated globular cluster, much like M68in Hydra. M71 has a luminosity of around 13,200 Suns.(Wikipedia)

Constellation Sagitta

Right ascension 19h 53m 46.49s

Declination +18° 46′ 45.1″

Distance 13.0 kly (4.0 kpc)

Apparent magnitude (V)+6.1

Apparent dimensions (V)7′.2

DAY: Sunday     DATE: 7/8/16     TIME: 02:30

SCOPE: Dob 10px Sky-Watcher F.L.1200/F4.7 

EYEPIECE: Explore Scientific 8.8mm F.O.V. 82°

LOCATION: Mammari 

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