Registration information for Hellas Sat-3 (international designator 2017-040A) & Hellas Sat-4 (international designator 2019-007A).
United Nations Office at Vienna
Vienna International Centre
Wagramerstrasse 5
A-1220 Vienna
AUSTRIA
Tel.: +43-1 26060-84950
Fax: +43-1-26060-5830