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This star cluster is about 13,000light years away fromEarth and spans 27 light-years (8 pc). The irregularvariable starZ Sagittae is a member.[10]
The M71 globular cluster at the center is surrounded by a dense Milky Way star field.
M71 was for many decades thought (until the 1970s) to be a densely packedopen cluster and was classified as such by leadingastronomers 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 theRR Lyrae "cluster" variable stars that are common in most globulars. However, modern photometricphotometry has detected a short "horizontal branch" in theH-R diagram (chart of temperature versus luminosity) which is characteristic of a globular cluster. The shortness of the branch explains the lack of RR Lyrae variables and is due to the globular's relatively young age of 9–10 billion years. Taking in many or only late series (Population I) stars explains relatively its stars. Hence today M71 is designated as a very loosely concentrated globular cluster, much likeM68 inHydra. M71 has a mass of about 53,000 M☉ and aluminosity of around 19,000L☉.[11]
