Past Cross-Division A-F Commission Solar System Ephemerides for 2018-2021

Parent Divisions: A, F

Solar System Ephemerides are developed for the Sun, Moon, planets, planetary satellites, asteroids and comets to support a broad range of scientific purposes. Since most observations of other bodies are made from Earth, precise knowledge of the orbit of the Earth is used for the reduction of many, if not most, astronomical observations. Accurate ephemerides of the Moon, planets, and planetary satellites are used in the planning and operation of interplanetary spacecraft missions. Ephemerides of the asteroid are used for evaluation of the origin of the solar system, for assessment of possible Earth impact events, and for many other purposes. Rotational elements for these bodies are closely associated with their ephemerides and are often used in data reduction.

The main objectives of the present commission are to promote the acquisition and dissemination of observations of solar system bodies and estimates of their ephemerides and rotational elements. New activities for the current triennium are hints of larger bodies on the Kuiper belt that may exist and correlate the orbits of the main belt and very distant objects. A symposium to discuss recent developments will be proposed.


William M. Folkner


Giovanni B. Valsecchi


Agnès Fienga

back to past Commissions list

Past Trienniums


Donate to the IAU

Donate to the IAU

IAU Strategic Plan 2020–2030

Strategic Plan

IAU Code of Conduct

Code of Conduct

Symposia and Meetings



How to Become a Member

Deceased Members

Deceased Members

Centre for the Protection of the Dark and Quiet Sky from Satellite Constellation Interference


IAU Catalyst

Latest Catalyst

IAU e-Newsletter
Volume 2022 n° 10

Latest e-Newsletter

Subscribe to the e-Newsletter


IAU Office of Astronomy for Development

Office for Astronomy Development

IAU Office for Young Astronomers

Office for Young Astronomers

IAU Office for Astronomy Outreach

Office for Astronomy Outreach

IAU Office of Astronomy for Education

Office of Astronomy for Education

International School for Young Astronomers

International School for Young Astronomers

WG Small Bodies Nomenclature Bulletins

WG Small Bodies Nomenclature Bulletins

IAU WG Women in Astronomy Newsletters and Ensemble Magazine

WG Women in Astronomy Newsletters