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Messier 54: Difference between revisions
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[[File:450px-Messier 54 HST.jpg|thumb|Messier 54]] | |||
Messier 54 (also known as M54 or NGC 6715) is a globular cluster in the constellation [[Sagittarius]]. It was discovered by Charles Messier in 1778 and subsequently included in his catalog of comet-like objects. | Messier 54 (also known as M54 or NGC 6715) is a globular cluster in the constellation [[Sagittarius]]. It was discovered by Charles Messier in 1778 and subsequently included in his catalog of comet-like objects. | ||
Previously thought to belong to our Galaxy at a distance from Earth of about 50,000 light-years, it was discovered in 1994 that M54 most likely belongs to the Sagittarius Dwarf Elliptical Galaxy (SagDEG), making it the first globular cluster formerly thought to be part of our galaxy reassigned to extragalactic status, even if not recognized as such for nearly two and a quarter centuries. | Previously thought to belong to our Galaxy at a distance from Earth of about 50,000 light-years, it was discovered in 1994 that M54 most likely belongs to the Sagittarius Dwarf Elliptical Galaxy (SagDEG), making it the first globular cluster formerly thought to be part of our galaxy reassigned to extragalactic status, even if not recognized as such for nearly two and a quarter centuries. | ||
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M54 is easily found in the sky, being close to the star ζ Sagittarii. It is, however, not resolvable into individual stars even with larger amateur telescopes. | M54 is easily found in the sky, being close to the star ζ Sagittarii. It is, however, not resolvable into individual stars even with larger amateur telescopes. | ||
In July 2009, a team of astronomers reported that they had found evidence of an intermediate-mass black hole in the core of M54.<ref>[http://en.wikipedia.org/wiki/Messier_54 Messier 54]]</ref> | In July 2009, a team of astronomers reported that they had found evidence of an intermediate-mass black hole in the core of M54.<ref>[http://en.wikipedia.org/wiki/Messier_54 Messier 54]]</ref> | ||
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HGS Sessions - Clearing [[San Francisco Golden Gate Bridge, 55 Reversal Grid]] - 3/31/2015 <ref>HGS Session</ref> | HGS Sessions - Clearing [[San Francisco Golden Gate Bridge, 55 Reversal Grid]] - 3/31/2015 <ref>HGS Session</ref> | ||