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What is Messier 11 (M11)?

Messier 11 (M11), popularly known as the Wild Duck Cluster, is a rich, compact open cluster located in the southern constellation Scutum The Wild Duck Cluster has an apparent magnitude of 6.3 and lies at a distance of 6,200 light years, or 1,900 parsecs from Earth.

What does Messier 12 mean?

Messier 12. Messier 12 or M 12 (also designated NGC 6218) is a globular cluster in the constellation of Ophiuchus. It was discovered by the French astronomer Charles Messier on May 30, 1764, who described it as a "nebula without stars". In dark conditions this cluster can be faintly seen with a pair of binoculars.

Which is the most distant open cluster in the Messier catalogue?

The Wild Duck Cluster is the most distant open cluster listed in the Messier catalogue that is visible to the naked eye. The cluster contains about 2,900 stars, which makes it one of the most populated open clusters known.

Is Messier 11 a variable star?

Messier 11 lies about a degree to the northwest of R Scuti, one of the first variable stars known. R Scuti was discovered by the English astronomer Edward Pigott in 1795 and is the first known RV Tauri type variable. The star’s brightness usually varies between magnitude 4.8 and 6, and occasionally between magnitude 4.5 and 8.2.

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