![]() When a star dies, it usually goes out with a bright shout as a super nova, or quietly fades into a softly glowing ember like a white dwarf. The naval catalogue spans around 50 years of sky surveys, capturing details of the entire sky in five colours down to a visual magnitude of about 21. The cosmic objects in the Pan-STARR data release include slightly dimmer objects, down to a magnitude of roughly 23 as compared to the SDSS's 22. In this latest study they compared 600 million objects in the USNO catalogue with a collection put together by the University of Hawaii's Pan-STARR system. It was an intriguing find, but hardly constituted compelling evidence of new kinds of astrophysics. ![]() Eventually they found a single star that genuinely seemed to have disappeared, and even that discovery came with lingering doubts. They were left with about 290,000 missing objects, most of which could easily be accounted for on closer inspection. In an earlier study Villarroel and her team compared the positions of some 10 million objects recorded in the US Naval Observatory Catalogue (USNO) with their counterparts in the Sloan Digital Sky Survey (SDSS). ![]()
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May 2023
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