Syracuse 4B & Heinrich Hertz (H2Sat)

Launch Overview

Liftoff Time:

Liftoff Time (UTC):

Launch Window:

Launch Pad:

Launch Facility:

June 16, 2023 (+00:00)

June 16, 2023 (+00:00)

To be determined

Ariane Launch Area 3


Payload Overview

Payload Mass:


~6950 kg (~15322lb)

Geostationary Transfer Orbit

Mission Details

Syracuse 4B is a French military communications satellite built by Thales Alenia Space. Heinrich Hertz (H2Sat) is a small geostationary communications satellite built by OHB System and the German Aerospace Center (DLR) to explore and test new broadband communications technologies.

Who is Arianespace?

Arianespace SA is a multinational company founded in 1980 as the world's first commercial launch service provider. It undertakes the operation, and marketing of the Ariane programme. Their vehicles launch exclusively from French Guiana in South America.

What Is Ariane 5 ECA+?

Ariane 5 ECA+ is a variant of the Ariane 5 heavy-lift vehicle, with a taller ECA-D upper stage.



Solid boosters used on the Ariane 5. They are the largest solid rocket boosters ever produced in Europe.

Vulcain 2 vacuum

A vacuum optimised version of the Vulcain 2 engine used on the Ariane 5 first stage.


European upper-stage engine designed for use on Ariane launch vehicles.

Rocket Overview


Ariane 5 ECA+

Ariane Launch Area 3

Kourou, French Guiana

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