29 Cygni

29 Cygni is a variable star located in the constellation Cygnus (the Swan). It is classified as a Beta Cephei variable, meaning it exhibits small, rapid pulsations in its brightness. These pulsations are caused by non-radial oscillations within the star's interior.

29 Cygni is a B-type star, specifically a B2.5IV star. This indicates it is a hot, blue-white star slightly evolved off the main sequence, suggesting it is a subgiant. Its apparent magnitude varies slightly, typically between 4.79 and 4.86, making it visible to the naked eye under good observing conditions.

The star is significantly more massive and luminous than the Sun. Its proximity has allowed for detailed study of its pulsation characteristics and atmospheric properties, contributing to our understanding of stellar structure and evolution in massive stars. The precise distance to 29 Cygni remains a topic of research, but it is estimated to be several hundred light-years from Earth. Its position in the sky is approximately right ascension 20h 49m 27.935s and declination +35° 27' 05.97".