***************************************************************************= *** dorismail 09-Feb-2026 14:57:00 Message No 1469 ***************************************************************************= *** Author: Alexandre Couhert Alexandre.Couhert@cnes.fr Subject: COSPAR Scientific Assembly Dear colleagues, we would like to draw your attention to the session "PSD.1: Satellite Dynam= ics: New Developments and Challenges for Earth and Solar System Sciences" o= rganized at the 46th Scientific Assembly of the Committee on Space Research= (COSPAR), to be held in Florence, Italy, August 1 - 9, 2026. PSD.1 session description: The aim of the Panel on Satellite Dynamics (PSD) is to support activities r= elated to the detailed description of the motion of artificial celestial bo= dies. This goal should be achieved by improving the current theories of mot= ion and by evaluating their determining forces in a more sophisticated way.= Detailed theoretical understanding of the dynamics of satellites should co= incide with the results of precise tracking in order to obtain the most pre= cise knowledge possible of the orbit and the corresponding orbital position= s. The scope of the Panel on Satellite Dynamics entails the positioning of a w= ide range of objects in space, including Earth orbiting satellites for Eart= h observation such as GRACE-FO, Swarm, Jason series, the Copernicus Sentine= ls, the future co-location in space mission Genesis and next generation gra= vity missions, and navigation satellite systems such as GPS, GLONASS, Galil= eo, Beidou, QZSS or tracking systems such as SLR and DORIS. In addition, po= sitioning plays an important role in the success of the continuously growin= g number of today's and tomorrow's missions to explore the Solar System. Re= cent and future missions have to deal with complex trajectories and innovat= ive propulsion and breaking techniques to visit multiple bodies (e.g., Cass= ini, Dawn, JUICE), small unconventional bodies (e.g., Hera, OSIRIS-REx, Luc= y), and harsh and unknown environmental conditions challenging our technica= l capabilities (e.g., Messenger, Venus Express, BepiColombo, JUNO). Both ad= vances in the modeling of spacecraft dynamics and the theoretical understan= ding of space observables (e.g., range, Doppler, VLBI, optical) are require= d to allow for a more efficient exploration and a deeper understanding of o= ur Solar System. Limiting errors in Precise Orbit Determination (solar radiation pressure, t= ime variable gravity fields, phase center corrections, attitude variations,= etc...) are of critical interest for many stakeholders. Moreover, formatio= ns of satellites are being realized and proposed for Earth observation and = fundamental sciences, that impose very severe constraints on (relative) pos= itioning and orbit and attitude control solutions (e.g. micro-propulsion). = Mini-satellites and cubesats also represent a new frontier for both Earth a= nd planetary exploration, posing new challenges as well as new opportunitie= s. Satellite orbit determination requires the availability of tracking systems= , well established reference frames and accurate station coordinate solutio= ns, detailed force and satellite models, and high-precision time and freque= ncy standards. Contributions covering all recent developments and plans in ground, satelli= te or probe positioning and navigation are solicited as well as contributio= ns on current progress on establishment, maintenance and improvement of ref= erence systems in Geo- and planetary sciences. Please consider submitting an abstract to this dedicated orbit session. The= deadline for abstract submission is February 13, 2026. We are looking forw= ard to your contribution. On behalf of the convenors of session PSD.1, Adrian J=E4ggi Co-convener: Francesco Topputo --=20 -------------------------------------------------------------------------= ---- Adrian Jaeggi Astronomical Institute, University of B= ern adrian.jaeggi@unibe.ch Sidlerstrasse 5, CH-3012 Bern, Switzerl= and http://www.aiub.unibe.ch/ Tel: +41 31 6848596