
Asteroid 2639, Planman, was discovered on April 9, 1940 by Yrjo Vaisala at Turku, Finland. It has a period of 3 years, 302 days.
It was named for Swedish astronomer and physics professor Anders Planman (1724-1803), who taught at the University of Abo in Finland; he determined the solar parallax was part of the project to determine the astronomical unit.
Asteroid Planman, according to Henk Middleraad, seems to be about planning or making plans.