Hubble captures a stunning globular cluster in Terzan 1, Take 2

The following topics will be covered by the ESA/HUBBLE telescope on October 9, 2022: Astronomy

Image from the Hubble Space Telescope of Terzan 1, a globular cluster in the constellation Scorpius that is located around 22,000 light-years from Earth. Credit: R. Cohen, NASA and ESA’s Hubble

A globular cluster called Terzan 1 can be found in the constellation Scorpius, about 22,000 light-years from Earth. The Turkish-Armenian astronomer Agop Terzan found 11 globular clusters between 1966 and 1971. This one of them is the one that you are looking at. During this time, he was based primarily at Lyon Observatory and working in France.

The 11 Terzan globular clusters are numbered from Terzan 1 to Terzan 12, which can be a little perplexing. This is due to an error Terzan made in 1971 when he rediscovered Terzan 5 and labelled it Terzan 11, a cluster he had already found and reported back in 1968. Along with Terzan’s discoveries of 9, 10, and 12, he publicised his discovery. As soon as he discovered his mistake, he tried to have Terzan 12 become Terzan 11. Sadly, he failed to make it apparent that Terzan 5 and Terzan 11 were identical objects, despite the fact that another astronomer, Ivan Robert King, published a remark to attempt and dispel the misunderstanding. Nowadays, the majority of studies acknowledge the original Terzan 5 and Terzan 12, and they accept the peculiarity that Terzan 11 doesn’t exist. However, there have been few cases of ambiguity in the scientific literature over the last few decades.

Terzan 1 was seen in a Wide Field Planetary Camera 2 photograph taken by the Hubble Space Telescope. Credit: NASA and ESA; acknowledgement: Judy Schmidt (Geckzilla)

Terzan 1 is not a new target for Hubble; a Wide Field Planetary Camera 2 image of the cluster was published back in 2015 (see image above) (WFPC2). During the 2009 Hubble servicing mission, the Wide Field Camera 3 (WFC3) equipment took its place. This incredibly detailed image shows how WFC3 is better than WFPC2 in terms of both resolving power and field of view.




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