Rediscovered, Renamed, Reclassified: Star Cluster NGC 6380 in Scorpius | Hubble

Rediscovered, Renamed, Reclassified: Star Cluster NGC 6380 in Scorpius | Hubble

This image shows the globular cluster NGC 6380. It lies around 35,000 light-years from Earth in the constellation Scorpio (The Scorpion). The very bright star at the top of the image is HD 159073, only around 4,000 light-years from Earth—making it a much nearer neighbor than NGC 6380. This image was taken with Hubble’s Wide Field Camera 3 (WFC3). As its name suggests, this instrument has a wide field of view, meaning that it can image relatively large areas of the sky in enormous detail.

NGC 6380 is not a particularly exciting name, but it indicates that this cluster is cataloged in the New General Catalog (NGC), originally compiled in 1888. This cluster has, however, been known by many other names. It was originally discovered by James Dunlop in 1826, and he rather immodestly named it Dun 538. Eight years later, in 1834, it was independently rediscovered by John Herschel and he (similarly immodestly) went on to name it H 3688. The cluster was re-rediscovered in 1959 in Paris by Pişmiş, who cataloged it as Tonantzintla 1—and to continue the pattern, also referred to it as Pişmiş 25. In addition to its colorful history of rediscovery, up until the 1950s NGC 6380 was thought to be an open cluster. It was A. D. Thackeray that realized that it was in fact a globular cluster. Nowadays, this cluster is reliably recognized in widely available catalogs as a globular cluster, and referred to simply as NGC 6380. 

Credit: ESA/Hubble & NASA, E. Noyola
Date: July 12, 2021

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