Spacenet 2, MARECS-2

Launch Time
Sat Nov 10, 1984 01:14 UTC

Flight V11.


Ariane 3
Image Credit: Arianespace
Status: Retired
Liftoff Thrust: 5,100 kN
Payload to GTO: 2,700 kg
Stages: 3
Strap-ons: 2
Rocket Height: 49.0 m

Mission Details

Spacenet 2

Spacenet 1 to 3R were a series of hybrid C-/Ku-band satellites. The Spacenet satellites were built for Southern Pacific Communications (SPC), which was bought by GTE before the first Spacenet ever launched.

The spacecraft were based on RCA's 3-axis stabilized AS-3000 bus.

To help offset the loss of DFH-2A 4 and the delay in the DFH-3 program, China in late 1992 purchased the nearly 9-year-old Spacenet 1 from GTE. In 1993 the spacecraft, renamed Zhongxing 5 (ChinaSat 5), was moved to 115.5 degrees E. Following ChinaSat-7's launch failure, ChinaSat purchased a second in-orbit satellite (Spacenet-2) in 1997 and renamed it ChinaSat-5R.

Payloads: 1
Total Mass: 1,195.0 kg
Geostationary Transfer Orbit


The MARECS (Maritime European Communications satellite) satellites were members of Inmarsat's first generation global maritime communications network. The program began as the experimental Maritime Orbital Test Satellite (MAROTS) in 1973, but was subsequently changed to an operational system resulting in a name change, a satellite redesign, and delayed development. MARECS is operated by ESA for Inmarsat.

Based on British Aerospace ECS platform. 3-axis stabilized to 0.2 deg (pitch, roll) using fully redundant momentum wheels, thrusters, and nutation dampers. Redundant sun sensors provide 0.04 deg knowledge. Two sun-tracking solar arrays provide 955 W (BOL) with 2 NiCd batteries for eclipse power. Hydrazine propulsion system for station-keeping.

Three repeaters: shore-to-ship with 5 MHz bandwidth, ship-to-shore with 6 MHz bandwidth, shore-to-shore with 0.5 MHz bandwidth. These provide 35 two-way voice channels plus search and rescue capabilities. One 2 m diameter L-Band antenna and 2 horns (one transmit, one receive) for 4/6 GHz channels. All antennas have full Earth coverage.

Payloads: 1
Total Mass: 1,060.0 kg
Geostationary Transfer Orbit


ELA-1, Guiana Space Centre, French Guiana, France



114th orbital launch attempt


3rd mission
4th mission of 1984
3rd successful mission

Ariane 3

2nd mission
2nd mission of 1984
2nd successful mission