<P> Perseus is bordered by Aries and Taurus to the south , Auriga to the east , Camelopardalis and Cassiopeia to the north , and Andromeda and Triangulum to the west . Covering 615 square degrees , it ranks twenty - fourth of the 88 constellations in size . It appears prominently in the northern sky during the Northern Hemisphere 's spring . Its main asterism consists of 19 stars . The constellation 's boundaries , as set by Eugène Delporte in 1930 , are defined by a 26 - sided polygon . In the equatorial coordinate system , the right ascension coordinates of these borders lie between 01 29.1 and 04 51.2 , while the declination coordinates are between 30.92 ° and 59.11 ° . The International Astronomical Union ( IAU ) adopted the three - letter abbreviation `` Per '' for the constellation in 1922 . </P>
when is the constellation perseus visible in the northern hemisphere
during the Northern Hemisphere 's spring