Messier 46 was the first object Charles Messier discovered after he had published the first edition of his list (M1-M45). He added this one to his catalogue on February 19, 1771, three days after presenting it to the academy, together with three more Messier objects, M47, M48, and M49.
The cluster is very rich, with 150 stars of mag 10-13 and probably a total population of over 500. The brightest of these stars are of spectral type A0, and each about 100 times more luminous than the Sun (the brightest is of apparent magnitude 8.7). This indicates an age of about 300 million years. The members are scattered over an angular diameter of about 27', corresponding to a linear extension of 30 light years at the cluster's distance of 5,400 light years
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Sergio