****************************************************************************** dorismail 07-Jan-2022 22:51:27 Message No 1303 ****************************************************************************** Author: Couhert Alexandre Subject: Precise Orbit Determination for Geodesy and Earth Science | G2.1 | Dear colleagues, this is to remind you (with apologies for multiple postings) to submit an a= bstract for the Session G2.1: Precise Orbit Determination for Geodesy and E= arth Science until January 12, 2022 at 13:00 CET. The session is planned as= an "oral/poster session" in case EGU22 will have an in-person component, a= s it is at the moment still planned. But there will also be the possibility= of uploading presentation materials (including pre-recorded presentations)= and there will be an online discussion forum for each presentation to give= online-only participants the chance to view all presentations and to inter= act with the presenters. We thus encourage you to submit an abstract to this dedicated orbit session= irrespective of your preference for an in-person or virtual participation. Session description: Precise orbit determination is of central importance for many applications = of geodesy and earth science. The challenge is to determine satellite orbit= s in an absolute sense at the centimeter or even sub-centimeter level, and = at the millimeter or even sub-millimeter level in a relative sense. Four co= nstellations of GNSS satellites are available and numerous position-critica= l missions (e.g. altimetry, gravity, SAR and SLR missions) are currently in= orbit. Altogether, outstanding data are available offering new opportuniti= es to push orbit determination to the limit and to explore new applications. This session aims to make accessible the technical challenges of orbit dete= rmination and modelling to the wider community and to quantify the nature o= f the impact of dynamics errors on the various applications. Contributions are solicited from, but not limited to, the following areas: (1) precise orbit determination and validation; (2) satellite surfac= e force modelling; (3) advances in modelling atmospheric density and in atm= ospheric gravity; (4) advances in modelling earth radiation fluxes and thei= r interaction with space vehicles; (5) analysis of changes in geodetic para= meters/earth models resulting from improved force modelling/orbit determina= tion methods; (6) improvements in observable modelling for all tracking sys= tems, e.g. SLR, DORIS, GNSS and their impact on orbit determination; (7) ad= vances in combining the different tracking systems for orbit determination;= (8) the impact of improved clock modelling methods / space clocks on preci= se orbit determination; (9) advances in modelling satellite attitude. On behalf of the convenors of session G2.1, Adrian J=E4ggi Co-conveners: Alexandre Couhert, Urs Hugentobler, Oliver Montenbruck, Heike= Peter