Hellas Sat 3 & GSAT-17

Launch Time
Wed Jun 28, 2017 21:15 UTC

Flight VA238.


Ariane 5 ECA
Image Credit: Arianespace
Status: Retired
Price: $200.0 million
Liftoff Thrust: 15,120 kN
Payload to LEO: 21,000 kg
Payload to GTO: 10,500 kg
Stages: 2
Strap-ons: 2
Rocket Height: 53.0 m
Fairing Diameter: 5.4 m
Fairing Height: 17.0 m

Mission Details

Hellas Sat 3-Inmarsat S EAN

Hellas Sat 3-Inmarsat S EAN – a two-payload “condosat” produced by Thales Alenia Space for Hellas Sat and Inmarsat – was set to ride on a Falcon Heavy. However, it was switched to riding on an Ariane 5 after Inmarsat noted it was struggling against regulatory issues in Europe.

Once in orbit, the Hellas Sat 3 component will deliver direct-to-home and telecom services to maintain and expand Hellas Sat’s business reach; while the Inmarsat S EAN component provides the satellite portion of Inmarsat’s new European Aviation Network.

It will use a multi-beam mission in S-band and Ka-band for Inmarsat as well as a powerful Ku/Ka-Band mission of 44 Ku and 1 Ka transponders for Hellas-Sat.

Payloads: 2
Total Mass: 5,780.0 kg
Geostationary Transfer Orbit


GSAT-17 is an Indian communications satellite. Built by ISRO and operated by INSAT, it carries 24 C-band, 2 lower C-band, 12 upper C-band, 2 CxS (C-band up/S-band down), and 1 SxC (S-band up/C-band down) transponders. It additionally carries a dedicated transponder for data relay (DRT) and search-and-rescue (SAR) services. At the time of launch, GSAT-17 was the heaviest satellite built by ISRO.

Payloads: 1
Total Mass: 3,477.0 kg
Geostationary Transfer Orbit


ELA-3, Guiana Space Centre, French Guiana, France



42nd orbital launch attempt


251st mission
7th mission of 2017
243rd successful mission
34th consecutive successful mission

Ariane 5

94th mission
4th mission of 2017
90th successful mission
80th consecutive successful mission