G823

G823 is a type of star located in the constellation of Cassiopeia. It is a red giant star, which means it has exhausted the hydrogen in its core and has expanded significantly in size. The star is approximately 1,000 light-years away from Earth and has a surface temperature of around 3,500 Kelvin. G823 is notable for its variability, as it is classified as a semi-regular variable star, which means its brightness fluctuates over time. The exact cause of these fluctuations is not fully understood, but it is believed to be related to pulsations in the star's outer layers. G823 is also of interest to astronomers because it is a member of the open cluster NGC 189, which is one of the oldest known open clusters in the Milky Way galaxy. The study of G823 and other stars in NGC 189 can provide valuable insights into the evolution of stars and the history of our galaxy.