What is the Minor Planet Center?

The Minor Planet Center, or MPC, is the single worldwide location for receipt and distribution of positional measurements of minor planets, comets and outer irregular natural satellites of the major planets. The MPC is responsible for the identification, designation and orbit computation for all of these objects. This involves maintaining the master files of observations and orbits, keeping track of the discoverer of each object, and announcing discoveries to the rest of the world via electronic circulars and an extensive website. The MPC operates at the Smithsonian Astrophysical Observatory, under the auspices of Division F of the International Astronomical Union (IAU).

All of the MPC's operating funds come from a NASA's Near-Earth Object Observations program grant. Much of the computer equipment that the MPC uses was provided by the Tamkin Foundation.

The MPC accomplishes this work with a staff of 5 full-time employees.


The MPC has 5 full-time employees.

Gareth Williams, MPC Associate Director

Gareth obtained his BSc(Hons) in Astronomy at University College, London, more years ago than he cares to admit. He began working at the MPC in 1990, when there were less than 5000 numbered minor planets, after working on orbits as an interested amateur for more than a decade.

Gareth was responsible, contrary to what is currently (June 2013) written on Wikipedia, for the identification of the last two lost numbered minor planets: (878) Mildred, 1991; and (719) Albert, in 2000. His favorite identification, though, remains that for (5011) Ptah.

Gareth obtained his PhD from the Open University (Milton Keynes) in 2013, working remotely and part-time. An expert in orbit determination and identification of objects, his thesis work was on the intrinsic brightnesses of minor planets.

Outside the MPC, Gareth is involved with his wife back-stage in local community theatre and local community cable TV.

Sonia Keys

Sonia is a programmer for the MPC and is a longtime observer of minor planets.

Michael Rudenko

Mike has worked at the MPC since 2009 as an IT Specialist. He created the MPC's public facing relational database, web interface and related pages. He is presently engaged in modernizing the MPC observation processing, orbit computation and related operations.

He received an SB in Mathematics from MIT in 1977, and has been engaged in computer programming ever since. During the 1980s he undertook a visual comet hunting project and discovered three comets with the aid of a 6-inch refractor.

José Luis Galache

José Luis studied physics at the Universidad Complutense de Madrid, Spain. He continued with an MPhys in Nuclear Astrophysics at the University of Surrey, UK and a PhD in Astronomy at the University of Southampton, UK.

He joined the MPC in 2009 and spends his days thinking up ways to make the MPC compliant with the 21st century while juggling a research interest in Near-Earth Objects, especially those that might be reachable by a human mission. He would be available for said mission should he be asked (back seat of the rocket is fine).

In his rapidly disappearing free time, José Luis enjoys street photography, playing guitar and reading The Economist to his newborn son.