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EchoStar IV is a communications satellite operated by EchoStar. Launched in 1998 it was operated in geostationary orbit at a longitude of 77 degrees west for 12 years.

EchoStar IV

Mission type	Communications
Operator	EchoStar
COSPAR ID	1998-028A
SATCAT no.	25331
Mission duration	12 years
Spacecraft properties
Bus	A2100AX
Manufacturer	Lockheed Martin
Launch mass	3,478 kg (7,668 lb)
Dry mass	1,400 kg (3,100 lb)
Power	10 kW
Start of mission
Launch date	May 7, 1998, 23:45 (1998-05-07UTC23:45Z) UTC
Rocket	Proton-K/Blok-DM3
Launch site	Baikonur 81/23
End of mission
Deactivated	July 2011 (July 2011)
Orbital parameters
Reference system	Geocentric
Regime	Geostationary
Longitude	77° west[1]
Semi-major axis	42,538.0 kilometers (26,431.9 mi)[1]
Perigee altitude	36,085.2 kilometers (22,422.3 mi)[1]
Apogee altitude	36,250.7 kilometers (22,525.1 mi)[1]
Inclination	7.0 degrees[1]
Period	1,455.3 minutes[1]
Epoch	May 14, 2017[1]
Transponders
Band	32 Ku band
Frequency	Uplink: 17.3 - 17.8 GHz Downlink: 12.2 - 12.7 GHz
Bandwidth	24 MHz
Coverage area	United States, Mexico and Puerto Rico
EIRP	53 dBW

Satellite

The launch of EchoStar IV made use of a Proton rocket flying from Site 81 at the Baikonur Cosmodrome, Kazakhstan. The launch took place at 23:45 UTC on May 7, 1998, with the spacecraft entering a geosynchronous transfer orbit. EchoStar IV carried 32 Ku band transponders to provide direct voice and video communications to small dishes in North America after parking over 119° W or 148° W longitude.[2]

Specifications

• Launch mass: 3,478 kilograms (7,668 lb)
• Power: 2 deployable solar arrays, batteries
• Stabilization: 3-axis
• Propulsion: LEROS-1C
• Longitude: 77° west

See also

• 1998 in spaceflight

References

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