The Commissions are:
Com. 15: Physical Studies of Comets and Minor Planets
Com. 16: Physical Studies of Planets and Satellites
Com. 20: Positions and Motions of Minor Planets, Comets, and Satellites
Com. 21: Light of the Night Sky
Com. 22: Meteors, Meteorites and Interplanetary Dust
Com. 51: Bioastronomy: Search for Extraterrestrial Life
Divisional Working Groups of interest to Commission 51 are:
1. The Working Group on Near Earth Objects (NEOs), chaired by David Morrison under Divisions I (Fundamental Astronomy) and III (Planetary Systems Sciences)
2. The Committee on Small Bodies Nomenclature (C SBN), chaired by P. Kilmartin, under Division III.
The URL for Division III is http://www.ss.astro.umd.edu/IAU/div3