Program: GN-2010A-Q-62

CK Vul erupted in 1670 and was visible for 2 years. Several observers tried to recover the star, but it has never been detected since the eruption. In 1980s a nebula was discovered near the position provided by former observers. Expansion of the nebula detected two decades later confirmed its relation to the 1670 yr outburst. The nature of the object still remains unclear. Surprisingly, in 2009 we have discovered 3 stars close to the expansion center, showing pronounced variability and proper motions. They are undoubtfully related to CK Vul. Their presence contradicts every scenario proposed for CK Vul so far and suggests that either more than 2 stars were involved in the dramatic event, or it has been followed by disruption of a star. We propose an extended analysis of the nebula and the stars using spectra and images, which will allow to reconstruct the dramatic event from 1670.