Tags: Star.
Tau Pegasi (τ Peg τ Pegasi) is a 4.6 magnitude star in the constellation Pegasus. The star has also the traditional names Salm[citation needed] Kerb[citation needed] (or El Khereb[citation needed]) and Markab a name shared with α Pegasi k Puppis and κ Velorum. τ Pegasi belongs to the spectral class A5 Vp making it an A-type main sequence star.This is a Delta Scuti variable star with a pulsation period of 0.94 hours. It is rotating rapidly with a projected rotational velocity of 150 km s−1.