AO Cassiopeiae
Star
AO Cassiopeiae, also known as Pearce's Star, is a binary system composed of an O8 main sequence star and an O9.2 bright giant that respectively weigh anywhere between 20.30 and 57.75 times and 14.8 and 31.73 times the mass of the Sun. Wikipedia
Constellation: Cassiopeia
Magnitude: 5.04
Absolute magnitude (MV): −
Apparent magnitude (V): 6.14 (6.07-6.24)
B−V color index: −0.13
Period (P): 3.52348 days
Radial velocity (Rv): −31.10 km/s