Messier 40 - Definition

Winnecke 4 (also known as Double Star M40, Messier Object 40 or WNC 4) is a double star in the Ursa Major constellation. It was discovered by Charles Messier in 1764.

External links

• Messier 40, SEDS Messier pages (http://www.seds.org/messier/m/m040.html)