The technical name of this supernova remnant is SNR G249.5+24.5, but the astronomers who discovered it dubbed it Hoinga, after the medieval name of the first author s hometown, Bad Hönningen am Rhein.
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The Hoinga supernova remnant (upper right) seen in X-rays (converted to colors representing the energies of the X-rays) by eROSITA. The bright blob at the bottom is actually two supernova remnants: Vela and Puppis A. Credit: SRG/eROSITA
They found it in observations taken by a mission called eROSITA (extended Röntgen Survey Imaging Telescope Array;
Röntgen is the German word for X-rays, after their discoverer). This is a space-based X-ray observatory on board a German-Russian spacecraft called Spectrum-Roentgen-Gamma, which orbits the Sun about 1.5 million kilometers from the Earth in a spot called the L2 point, a volume of space where a spacecraft can remain semi-stable without too much effort.