Exploring Henderson Books (1 of 2)- Delta Cassiopeiae (Wikipedia)
Delta Cassiopeiae (δ Cassiopeiae, abbreviated Delta Cas, δ Cas) is an eclipsing binary star system in the northern circumpolar constellation of Cassiopeia. Based on parallax measurements taken during the Hipparcos mission, it is approximately 99.4 light-years (30.5 parsecs) from the Earth.[