Subject: CfP for Genesis IAG/ESA Combination Pilot Project From: Urs Hugentobler Dear Colleagues, the upcoming Genesis mission requires for the first time a rigorous combination of the satellite orbit in the ITRF-combination. In order to test and assess the feasibility of procedures for orbit combination at normal equation level, the IAG WG 1.1.1 jointly with the ESA Genesis WG 1 issue a Call for Participation for a Combination Pilot Project that you find at this link: https://colab.tuwien.ac.at/spaces/GW/pages/637764156/PP-Combination We are looking forward to a participation of multiple expert groups, joining efforts for finding optimum procedures for consistent realization of a future ITRF containing Genesis observations. Please reply to the call until 17.07.2026 or at your earliest convenience. Best regards Urs Hugentobler