Asteroid 4085, Weir, was discovered on May 13, 1985 by Carolyn S. Shoemaker at Palomar Mountain Observatory near Pauma Valley, California. It has a period of 4 years, 77 days.

It was named for American geologist Doris Blackman Weir, who as technical editor for the astrogeology branch of the US Geological Survey was in charge of publishing maps of planets and moons.

Henk Middleraad, who created the glyph for asteroid Weir, has its astrological meaning as obstacle.

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