61 Ursae Majoris is the human designation for a star located in the Milky Way Galaxy. The star is the primary of the Archer system, named for Jonathan Archer, the captain of the first vessel to chart the star close-up, Enterprise. (ENT: "Strange New World", "In a Mirror, Darkly, Part II")
Upon his return to Earth following the search for the Xindi superweapon, Archer pointed out the star in Earth's sky to Erika Hernandez, to the left of the star Polaris. (ENT: "Home")
Background information
The star was designated so in Archer's bio screen aboard the USS Defiant, created by Mike Sussman.
It should be noted that from Archer's vantage point in "Home", 61 Ursae Majoris is not to the left of Polaris, but in fact far to the right, being part of the Ursa Major constellation. However, Eta Cassiopeiae - the proposed location of the Terra Nova colony from Geoffrey Mandel's book Star Trek: Star Charts - IS just off to the left, in the constellation Cassiopeia. It is possible that Sussman (who also wrote "Home") confused the two stars.
In Larry Niven's Known Space, 61 Ursae Majoris is the central star of the Kzinti's homeworld.