The star Alpha Canum Venaticorum, 115 l.y. away. It is a wide double star. The brighter component is an A0 bright giant of magnitude 2.9, the prototype of the Alpha2 Canum Venaticorum variables (magnetic stars with variable spectra) and fluctuates by about 0.1 mag. in a period of 5.5 days. The companion is an F0 dwarf, magnitude 5.6.
Subjects: Astronomy and Astrophysics.