NGC 7209 is an open cluster in the constellation Lacerta.

[5] The cluster is made up out of 150 stars with magnitude from 9 to 15[6] within a tidal radius of 9 parsec (30 light years).

[7] One other member of the cluster is the variable SS Lancertae, a binary star with 14.4 day period whose magnitude stopped varying in the middle of the 20th century.

This has been attributed to the presence of a third star with period 679 days, whose perturbations change the line of sight.

The nodal cycle is found to be about 600 years, within which occur two ecliptic phases, each lasting about 100 yr.[8]