Dear colleagues,

we would like to draw your atte= ntion to the session “G2.1 Precise Orbit Determination for Geodesy an= d Earth Science” organized at the upcoming General Assembly of the Eu= ropean Geosciences Union, taking place from April 14-19, 2024. The EGU24 aims to bring together geoscientists from all over = the world to one meeting covering all disciplines of the Earth, planetary, = and space sciences. The EGU aims to provide a forum where scientists, espec= ially early career researchers, can present their work and discuss their ideas with experts in all fields = of geoscience.

G2.1 session description:<= /o:p>

Precise orbit determination is = of central importance for many applications of geodesy and earth science. T= he challenge is to determine satellite orbits in an absolute sense at the c= entimeter or even sub-centimeter level, and at the millimeter or even sub-millimeter level in a relative sense. Fo= ur constellations of GNSS satellites are available and numerous position-cr= itical missions (e.g. altimetry, gravity, SAR and SLR missions) are current= ly in orbit. Altogether, outstanding data are available offering new opportunities to push orbit determination = to the limit and to explore new applications.

This session aims to make acces= sible the technical challenges of orbit determination and modelling to the = wider community and to quantify the nature of the impact of dynamics errors= on the various applications.

Contributions are solicited fro= m, but not limited to, the following

areas: (1) precise orbit determ= ination and validation; (2) satellite surface force modelling; (3) advances= in modelling atmospheric density and in atmospheric gravity; (4) advances = in modelling earth radiation fluxes and their interaction with space vehicles; (5) analysis of changes in geod= etic parameters/earth models resulting from improved force modelling/orbit = determination methods; (6) improvements in observable modelling for all tra= cking systems, e.g. SLR, DORIS, GNSS and their impact on orbit determination; (7) advances in combining th= e different tracking systems for orbit determination; (8) the impact of imp= roved clock modelling methods/space clocks on precise orbit determination; = (9) advances in modelling satellite attitude; (10) simulation studies for the planned co-location of geodetic = techniques in space mission GENESIS.

Please consider submitting an a= bstract to this dedicated orbit session.

The deadline for abstract submi= ssion is January 10, 2024 at 13:00 CET.

We are looking forward to your = contribution.

On behalf of the convenors of s= ession G2.1, Adrian J=E4ggi

Co-conveners: Alexandre Couhert= , Jose van den IJssel, Oliver Montenbruck, Urs Hugentobler