Intelsat IV Press Kit 011772

8/7/2019 Intelsat IV Press Kit 011772

1/10

**7H " p7 - /0o03SNATIONAL AERONAUTICS ANDSf SPACE ADMINISTRATIONWashington, D. C. 20546

202-755-8370" FOR RELEASE:

MONDAY PMs,S eIc se., NO. ia-q January 17, 1972P PROJECT: INTELSAT IV

contents


2/10

NATIONAL AERONAUTICS ANDSSPACE ADMINISTRATIONWashington, D. C. 20546Phone: (202) 755-8370

FOR RELEASE:Howard Allaway MONDAY PMs,(Phone: 202/755-3680) January 17, 1972Larry Hastings (Comsat)(Phone: 202/554-6100)RELEASE NO: 72-9


3/10

- - 2 --2

The Atlas-Centaur launch vehicle will place thesatellite in a highly elliptical orbit ranging fromapproximately 563 to 36,800 kilometers (350 to 22,300statute miles). After checkout and orientation of thespacecraft a solid propellant rocket motor aboard thespacecraft will be fired to circularize the orbit at

Ssynchronous altitude (36,800 kilometers or 22,300 statutemiles). At this altitude the speed of the spacecraft


4/10

The first Intelsat IV satellite was launched Jan. 25, 1971and placed in commercial service March 26 over the AtlanticOcean at 24.5 degrees West longitude. The second Intelsat IVwas launched Dec. 19, 1971. It is presently being checkedSout and is expected to go into service later this month.

") F GENERAL RELEASE; BACKGROUND INFORMATION FOLLOWS)


5/10

* * - ** - 4 --

*4

8 -4-SPACECRAFT

The Intelsat IV's are the largest commercial com-munications satellites ever launched, both in size andcommunication capacity. Each stands over 17 feet highand weighs 3,110 pounds at launch. After the solid-fueled, on-board apogee motor has been fired to thrustShe spacecraft from transfer to synchronous orbit, thein-orbit weight is 1,587 pounds.Each Intelsat IV satellite is capable of carryinga varying number of telephone circuits simultaneously,* depending on whether the power is radiated to earth bySwide r spotbeam antenna configuration. The averageantenna configuration provides telephone capacity of


6/10

LAUNCH VEHICLEIntelsat IV is the 18th operational launch fo r theAtlas-Centaur. The rocket combination, standing approximately35 meters (113 feet) high, consists of an Atlas SLV-3Cbooster and Centaur second stage.The Atlas booster develops 403,000 pounds of thrustat liftoff using two 171,000-pound thrust booster enginesand one 6 0,000-pound thrust sustainer engine. Its propellantsare RP-1 (a kerosene type fuel) and liquid oxygen (LOX).The Centaur second stage, which was developed and isflown under the direction of NASA, Lewis Research Center,Cleveland, was the first U.S. rocket to use the high energy


7/10

6LAUNCH WINDOW

The primary factor determining the launch windowfor Intelsat spacecraft is the angle of the sun. It isdesirable for the solar cells on the spacecraft toreceive the maximum possible exposure during the transferorbit. The sun angle is at its best twice a day at noonand midnight Greenwich Mean Time of 7:00 a.m. and 7:00 p.m. EST.Because of the greater convenience fo r launch crews andi tracking operations the 7:00 p.m. period is generally chosen.- more -


8/10

- 7

INTELSAT TEAMNASA Headauarters

Dr. John E. Naugle Associate Administrator forSpace Sciencef Vincent L. Johnson Deputy Associate Administratorfo r OSSJerome Freibaum Program ManagerJoseph B. Mahon Director, Launch Vehicle ProgramsT. B. Norris Medium Launch Vehicles ProgramManager


9/10

S1

S-8-

Hughes Aircraft Co. INTELSAT IV SpacecraftSSunnyvale, Calif.

* General Dynamics/Convair Atlas-Centaur LaunchSan Diego, Calif. Vehicle

or- more -


10/10

- 9 -Prograir.Flight Events Time Speed Inertial Range Altitude

Statute StatuteSeconds MPH KM/HR Miles Kilometers Miles KilometersBECO 151.4 6622.3 10,655.2 55.1 88.6 36.12 58.1Booster jettison 154.5 6693.9 10,770.4 59.7 96.0 37.97 61.0Insulatxor. panel jettison 196.4 7545.4 12,140.5 127.6 205.3 60.98 98.1SECO/VECG 241.2 8826.5 14,201.8 214.7 345.4 82.94 133.4Centaur separation 243.2 8795.2 14,151.4 217.7 350.2 83.94 135.0Centaur MEIG (1) 252.7 8786.3 14:137.1 238 382.9 88.06 141.6Nose fairing jettison 264.7 8885.8 14,297.2 262.9 423.0 .92.90 149.4Centaur MECO (1 ) 62'.2 18,562 29,866.2 1413 2,273.5 117.5 189.0Centaur MEIG (2) 1519.0 17,610 28,334.4 5487 8,828.5 371.3 597.4Centaur MECO (2 ) 1593.2 22,009 55,412.4 5836 9,390.1 417.7 672.1Spacecraft separation 1728.6 21,643 34,823.5 6522.8 10,495.1 549.2 8q3.6Reorient Centaur 1733.6Start blowdown 1898.67nd oiowdown 2148.6

- en d -

Intelsat IV Press Kit 011772

Documents

Transcript of Intelsat IV Press Kit 011772