V339 Delphini

V339 Delphini (or Nova Delphini 2013 or V339 Del) is a classical nova discovered during an eruption in 2013 that peaked at a magnitude of +4.3. It was the first nova in which signs of lithium synthesis were found, a process that had been theorized to occur but had never been detected. Observed absorption lines were interpreted as those of beryllium-7, which decays into the common stable lithium isotope, lithium-7.