S Cassiopeiae

S Cas is a well-observed Mira variable of the northern skies with a longer-than-average period over 600 days.  It currently has a range of over eight magnitudes, although that seems to have varied in the past; as recently as the 1970s S Cas seemed to have a series of faint maxima where the star rarely made it over magnitude 10.  The long-term light curve also shows some evidence of humps and shoulders in the light curve, something fairly common among the longer-period Miras.