ag draconis is a binary star system in the northern constellation of draco. it consists of a giant star and a white dwarf that revolve around each other every 550 days. it has a baseline apparent magnitude of around 9.8 and flares up to around magnitude 7.3 and is one of the most-studied of symbiotic star systems and its variations in brightness have been observed for 124 years. the outbursts occur every 15 years and last for 3–6 years.