Hughes: HS-312 / HS-351 / HS-353

Intelsat-4

Comstar

Intelsat-4A

Satellite	Ordered	Date		Launcher	Weight (kg)		Remarks
Satellite	Ordered	Date		Launcher	Launch	BOL	Remarks
HS-312
Intelsat-4 1		22.05.1975		Atlas-SLV3D Centaur-D1A	1414
Intelsat-4 2		26.01.1971		Atlas-SLV3C Centaur-D	1414
Intelsat-4 3		20.12.1971		Atlas-SLV3C Centaur-D	1414
Intelsat-4 4		23.01.1972		Atlas-SLV3C Centaur-D	1414
Intelsat-4 5		13.06.1972		Atlas-SLV3C Centaur-D	1414
Intelsat-4 6		20.02.1975	F	Atlas-SLV3D Centaur-D1A	1414		Launch failure
Intelsat-4 7		23.08.1973		Atlas-SLV3D Centaur-D1A	1414
Intelsat-4 8		21.11.1974		Atlas-SLV3D Centaur-D1A	1414
HS-351
Comstar 1A	1973	13.05.1976		Atlas-SLV3D Centaur-D1AR	1516
Comstar 1B	1973	22.07.1976		Atlas-SLV3D Centaur-D1AR	1516
Comstar 1C	1973	29.06.1978		Atlas-SLV3D Centaur-D1AR	1516
Comstar 1D	1973	21.02.1981		Atlas-SLV3D Centaur-D1AR	1516
HS-353
Intelsat-4A 1		26.09.1975		Atlas-SLV3D Centaur-D1AR	1515
Intelsat-4A 2		29.01.1976		Atlas-SLV3D Centaur-D1AR	1515
Intelsat-4A 3		07.01.1978		Atlas-SLV3D Centaur-D1AR	1515
Intelsat-4A 4		26.05.1977		Atlas-SLV3D Centaur-D1AR	1515
Intelsat-4A 5		29.09.1977	F	Atlas-SLV3D Centaur-D1AR	1515		Launch failure
Intelsat-4A 6		31.03.1978		Atlas-SLV3D Centaur-D1AR	1515

Further Hughes / Boeing satellite busses: