Albireo, also known as β Cygni, is a triple star system located around 385 light years from Earth. The component stars (a blue dwarf, an orange giant, and a third, extremely low-magnitude star) together form the third brightest point in the constellation Cygnus. The star system was mentioned in the anime episode Usagi is Frantic! Rei's First Date.
Albireo and Kunitachi
Albireo was the star controlling the energy of the park-keeper Kunitachi. Nephrite used this knowledge to predict a peak in the man's energy, and planned to exploit and ultimately steal his life energy with the help of the Youma Petasos, who was implanted into Kunitachi's hat.