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ADVISORY/ILS Proton to Launch Intelsat 903.

Assignment/News Editors

ADVISORY...for Saturday (March 30)


Payload: Intelsat 903
 Loral 1300 platform
 Separated mass: approx. 4,726 kg (10,421 lbs)

Launch Vehicle: Proton K/Block DM
 Weight at liftoff: 691,272 kg
 (1.5 million lbs), including payload
 Height: 57.2 m (187.7 ft)
 Payload fairing: 4.35 m (14.27 ft) diameter

Launch Date: Saturday, March 30, 2002

Launch Window Opens: 10:25 p.m. Baikonur
 8:25 p.m. Moscow
 17:25 GMT
 12:25 p.m. EST (USA)

Launch Site: Baikonur Cosmodrome, Kazakhstan
 Launch Complex 81, Pad 23

End User: Intelsat, international satellite operator

Satellite Manufacturer: Space Systems/Loral, Palo Alto, Calif.

Launch Vehicle Khrunichev State Research and Production
Manufacturer: Space Center, Moscow - Proton first three
 stages; RSC Energia, near Moscow - Block DM
 fourth stage

Launch Services International Launch Services (ILS), McLean,
Provider: Va.

Satellite Use: Internet, broadcast, telephony and business
 services for Atlantic and eastern Pacific
 ocean regions

Satellite Statistics: -- 4th satellite launched in Intelsat IX
 -- Orbital location: 325.5 degrees East
 -- 76 transponders at C-band (36 MHz
 equivalent units)
 -- 24 transponders at Ku-band (36 MHz
 equivalent units)
 -- Anticipated service life of 13 years

Mission Profile: The Proton launch vehicle will inject the
 Intelsat 903 satellite into geosynchronous
 transfer orbit. The first three stages will
 use a standard ascent trajectory to place the
 Block DM upper stage with the satellite into
 a 161-km (100-mi) circular parking orbit,
 inclined at 51.6 degrees. Then the "enhanced"
 three-burn Block DM will propel the satellite
 to its transfer orbit. Following separation
 from the Block DM, the spacecraft will
 perform a series of liquid apogee engine
 burns to raise perigee, lower inclination and
 circularize the orbit at the geostationary
 altitude of 36,000 km (22,300 mi).

Spacecraft Separation: Approximately 6 hours, 43 minutes after

ILS Mission Statistics: -- 3rd ILS mission this year
 -- 1st ILS Proton mission this year
 -- 22nd ILS mission on Proton since formation
 of the U.S.- Russian joint venture in 1995

Live Broadcast: Satellite: Telstar 5, transponder 23, C-band
 Downlink frequency 4169 vertical
 Test signals to begin at 11:30 a.m. EST

More Information: Live webcast and general mission information
 are available on the ILS web site at Launch status updates are
 available on the ILS U.S. domestic Launch
 Hotline at 1-800-852-4980.
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Publication:Business Wire
Date:Mar 26, 2002
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