Cepheids, which change their brightness with a weekly period from the fourth to the fifth magnitude. X SGR is located near the border with the constellation of Sagittarius. It reaches a maximum of 4.3 mag and a minimum of 4.9 mag. Its period is 7.012 days. W SGR fluctuates between 4.3 mag and 5 mag in a period of 7.595 days.