Intelsat 4A

Part of the Intelsat program

Intelsat 4A satellites increased satellite capacity to 7250 voice circuits or 2 TV channels.

Spacecraft
Spin stabilized with a despun antenna structure. Hydrazine propulsion system. Passive thermal control. Body mounted solar cells.

Payload
Twenty transponders. Multiple access. 7250 voice circuits or 2 TV channels.

Country of Origin	International
Customer/User	ITSO
Manufacturer(s)	Hughes
Size	Cylinder: 2.8 m long (6.8 m w/antenna), 2.4 m diameter
Orbit	F1: GEO over Atlantic / F2: GEO over Atlantic / F3: GEO over Indian Ocean / F4: GEO over Atlantic / F6: GEO
Design Life	7 years

Launch Facts

Name	Int'l Desig.	Date	Site	Vehicle	Orbit	Mass(kg)
Notes
Intelsat 4A F-1	1975-091A	9/26/75	ESMC	Atlas Centaur	GEO	1500
Intelsat 4A F-2	1976-010A	1/30/76	ESMC	Atlas Centaur	GEO	1500
Intelsat 4A F-4	1977-041A	5/26/77	ESMC	Atlas Centaur	GEO	1500
Intelsat 4A	none	9/29/77	ESMC	Atlas Centaur	FTO	1500
Intelsat 4A F-3	1978-002A	1/7/78	ESMC	Atlas Centaur	GEO	1511
Intelsat 4A F-6	1978-035A	3/31/78	ESMC	Atlas Centaur	GEO	826