Inmarsat-3 (I-3) [Lockheed Martin]
Launched in 1996-8, the Inmarsat-3s were built by Lockheed Martin Astro Space (now Lockheed Martin Missiles & Space) of the USA, responsible for the basic spacecraft, and the European Matra Marconi Space (now Astrium), which developed the communications payload.
The Inmarsat I-3 communications payload can generate a global beam and a maximum of seven spotbeams. The spotbeams are directed as required to make extra communications capacity available in areas where demand from users is high.
Inmarsat I-3 F1 was launched in 1996 to cover the Indian Ocean Region. Over the next two years F2 entered service over Atlantic Ocean Region-East, followed by F3 (Pacific Ocean Region), F4 (Atlantic Ocean Region-West) and F5 (limited services on a single spot beam, back-up and leased capacity).
Inmarsat I-3 F2 was launched without apogee kick motor, as the Proton-K Blok-DM1 launch vehicle was capable of direct GSO injection.
Inmarsat-3 F4 was retired in 2016 and was moved into a graveyard orbit above the geostationary belt.
|Type / Application:||Communication|
|Contractors:||Lockheed Martin Astro|
|Equipment:||22 (+11) L-band transponders (22W Power amplifiers), C-band uplink|
|Propulsion:||Star-37FM ? (except #2)|
|Power:||2 deployable solar arrays, batteries|
|Mass:||2068 kg (#1, 3, 4, 5);|
|Inmarsat-3 F1 (Inmarsat I-3 F1)||1996-020A||03.04.1996||CC LC-36A||Atlas-2A|
|Inmarsat-3 F2 (Inmarsat I-3 F2)||1996-053A||06.09.1996||Ba LC-81/23||Proton-K Blok-DM1|
|Inmarsat-3 F3 (Inmarsat I-3 F3)||1996-070A||18.12.1996||CC LC-36B||Atlas-2A|
|Inmarsat-3 F4 (Inmarsat I-3 F4)||1997-027A||03.06.1997||Ko ELA-2||Ariane-44L H10-3||with Insat 2D|
|Inmarsat-3 F5 (Inmarsat I-3 F5)||1998-006B||04.02.1998||Ko ELA-2||Ariane-44LP H10-3||with Brasilsat B3|