Asteroid 1585, Union, was discovered September 7, 1947 by EL Johnson at Union Observatory (later Johannesburg Observatory) in Observatory, Gauteng, South Africa, a suburb of Johannesburg. It has a period of 5 years, 4 days and is 34 1/3 miles in diameter.
It was named after the observatory where Johnson discovered it.
Union (later Johannesburg) Observatory
Astrologically, Union has been said to be about union, unions, partnering, joining; it can also be a name asteroid for places named Union.