NGC 5466
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NGC 5466 is a globular cluster of stars in the constellation Boötes. It was discovered by German-British astronomer William Herschel on May 17, 1784, and catalogued as H VI.9.[1] This large, dim cluster has an apparent visual magnitude of 9.2 and spans an angular size of Script error: No such module "val"..[2] It is relatively distant from the Sun,[3] about Script error: No such module "convert". away,[3][4] and Script error: No such module "convert". from the Galactic Center.[5]
Observations
The Shapley–Sawyer Concentration Class of NGC 5466 is XII.[6] This is a loose cluster with an unusually low central density compared to other globulars with similar luminosity.[7] It is located at a high galactic latitude and thus displays negligible reddening from interstellar dust.[7] The cluster has a core radius of Script error: No such module "val". and a half-light radius of Script error: No such module "val".. The King tidal radius is Template:Cvt.[3]
Observation of the distribution of stars in the cluster shows the impact of mass segregation, with heavier objects sinking toward the center. This is a dynamically young cluster that is just starting to evolve.[8] An isochrone fit to the cluster yields an age estimate of 12.15±0.11 billion years.[9] Other age estimates range from 12.2±0.9 to 13.57 Gyr, depending on the method.[4][10] It has an extremely low metallicity.[9]
In 2006, a long tidal stream was detected stretching from this cluster,[11] perhaps reaching as far as Script error: No such module "val". across the sky.[12][13] It has a combined mass estimated as Script error: No such module "val"..[3] The width dispersion of the stream is Script error: No such module "val"., corresponding to a physical width of Template:Cvt at the distance of the cluster.[3] The presence of a tidal tail suggests the cluster has been strongly disrupted due to gravitational interactions with the Milky Way galaxy.[7] At some point, this stream may have been tidally disrupted by the Large Magellanic Cloud.[13]
A total of 97 blue straggler stars have been identified in this cluster, which show a mild central peak in distribution.[14] In 2019, it was reported that a candidate hot white dwarf had been discovered orbiting a blue straggler star in the outskirts of NGC 5466. This was the second such pair discovered in a globular cluster.[15] Three short period eclipsing binaries have been found along with six SX Phoenicis variables.[16][17] This was the first globular where a blue straggler eclipsing variable was found.[8] The cluster is host to the brightest-known anomalous Cepheid variable, designated V19.[18][19]
Gallery
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The location of NGC 5466 (circled in red)
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NGC 5466 imaged with a 32-inch telescope
See also
References
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Further reading
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External links
- NGC 5466 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
- VizieR, NGC 5466
- SEDS, NGC 5466
- Aladin, Image NGC 5466