M71 Surprising Globular in Sagitta (Dave Erickson)

Celestial hemisphere: Northern · Constellation: Sagitta (Sge) · Contains: M 71 · NGC 6838 · The star 9 Sge

M71 Surprising Globular in Sagitta, Dave Erickson

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M71 Surprising Globular in Sagitta

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M71 Surprising Globular in Sagitta

Messier 71 NGC 6838) a globular cluster in Sagitta. M71 is designated as a very loosely concentrated globular cluster, much like M68 in Hydra.

This star cluster is about 13,000 light years away from Earth and spans 27 light-years.

M71 was for many decades thought (until the 1970s) to be a densely packed open cluster. Recent photometric photometry has detected a short "horizontal branch" in the H-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 to10 billion years.

I was surprised by how M71 blends into the dense background star field...

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Status	Advanced failed
Started	...
Astrometry.net job	8670250
PixInsight job	PQ1ZGOMP03LHB5QZ260VE5B0FT3293XC
PixInsight queue size	n/a
PixInsight stage	PLATE_SOLVING_IMAGE

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M71 Surprising Globular in Sagitta

M71 Surprising Globular in Sagitta

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M71 Surprising Globular in Sagitta

M71 Surprising Globular in Sagitta

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