NGC 5749 is an open cluster of stars positioned near the southwest border of the southern constellation of Lupus. It is located at a distance of 3,548 light years from the Sun.[1] This is a poorly populated cluster that shows a low level of concentration;[6] the Trumpler class is IV1p.[7] There are 112 stars brighter than magnitude 14.4 within an angular radius of ~15′ of the cluster center, but only about 30% of these are members.[7] NGC 5749 is 27[4] million years old with a tidal radius of 11.7 light years and a mass of ~21 M☉.[3] Polarization measurements suggest there is a dust cloud within the cluster.[1]
^ abClaria, Juan J.; Lapasset, E. (October 1992). "New Color-Magnitude Diagrams and Basic Parameters of the Open Cluster NGC 5749". Acta Astronomica. 42: 343–353. Bibcode:1992AcA....42..343C.