They determine if the object : is in orbit around the Sun, has sufficient mass to assume hydrostatic equilibrium (a nearly round shape), and has "cleared the neighbourhood" around its orbit. Look in...
The previous president was Catherine Cesarsky. She was replaced in 2010 by Robert Williams. See related link
the year 1919
Divide sky up into 88 Sections/Constellations... Took me awhile lol hope it helps :P
As an orbiter of the Earth, and as a heavenly body within the gravitational pull of the Sun (heliocentricity).