NEBULAE & STAR CLUSTERS A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z           HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site Double Cluster (h and Chi Persei; NGC 869 and NGC 884) Double Cluster. Image credit: Michael Fullbright (MSFAstro.net) Two young open clusters that lie close together in the sky in Perseus and are visible to the naked eye on a clear, dark night as a hazy patch of light. Both clusters lie in the Perseus OB1 Association and contain many B stars and M supergiants. visual magnitude 4.3 (h), 4.4 (Chi) age (millions of years) 5.6 (h), 3.2 (Chi) distance (light-years) 7,100 (h), 7,400 (Chi) Related category    • NEBULAE AND STAR CLUSTERS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP