Discovered in 1745 by Philippe Loys de Chéseaux and seperately by John Bevis in 1750 M 35 is an open star-cluster, some 2700 Lightyears away from earth and it holds around 24 lightyears in diameter which appears in the size of the full moon on the night sky. The cluster is fabeled to count more than 500 proper members while the entire object is supposed to be 100 Mio years old.

Discovered by William Herschel in 1784 NGC 2158 was considered to be a globular cluster for a long periode until the 70ies. Its true nature came clear later and it is catalouged as an open cluster. This cluster measures only 5 arc minutes in diameter located some 10800 lightyears away from earth and being more than 1 Bio. years old.