This article is about the international organization. For the comet, see Comet ISON.
The International Scientific Optical Network (Russian: Международная научная оптическая сеть, Пулковская кооперация оптических наблюдателей) is an international project, currently consisting of about 30 telescopes at about 20 observatories in about ten countries (Russia, Ukraine (Andrushivka), Georgia (Abastumani), Uzbekistan, Tajikistan, Moldova, Spain (Teide), Switzerland (Zimmerwald), Bolivia (Tarija), USA (Mayhill), Italy (Collepardo)) which have organized to detect, monitor and track objects in space. ISON is managed by the Keldysh Institute of Applied Mathematics, part of the Russian Academy of Sciences. It was credited for the discovery of comets C/2010 X1 (Elenin) and C/2012 S1 (ISON), the latter popularly known as Comet ISON.