The money from the sale of this collection will be donated to a kindergarten dedicated to the treatment of children with cerebral palsy. Ruckbach (Delta Cassiopeia) is a double star with a period of 460 days. Belongs to spectral class A5. It is 99 light years away and has an apparent magnitude between 2.68 and 2.74. It's the fourth brightest in the cluster. It gets its name from the Arabian Knee. Sometimes it is called Xora. Coordinates of the star: Ruckbach-δ α1h54m δ +63° 40′. Magnitude: m. 3,38 M--- Spectral class: B3 Distance, Parsec: 142.8