Other interesting Stars
The binary zeta Sgr cannot be resolved by amateur scopes, just one star magnitude 2.6 can be seen.
21 Sgr is a test for a 80 mm telescope, the orange green pair have a magnitude of 5.0 and 8.3.
W Sgr is a cepheid varable star fluctuating every 7 days and 14 hours between 4.4 - 5.0 magnitude.
The supergiant U Sgr lies close to the center of M25 this Cepheid varies 6.3-7.1 magnitude every 6 days and 18 hours.