Inmarsat 3's specifications

Prime contractor Lockheed Martin (formerly GE Astro Space)
Platform GE-4000
Mass at launch 1850-2000 kg
Dry mass 895 kg
Mass in orbit 1150 kg
Payload mass 208 kg
Dimension 2.1 x 1.8 x 1.7 m
Solar array 16.7 m
Stabilization 3-axis
DC power 2800 W
Payload power sunlight: 2138 W, eclipse: 1725 W
Design lifetime 13 years

Equipped with Matra Marconi Space communications payload and a Star 37 solid apogee motor

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